GB/T 14525-1993 General technical requirements for corrugated metal hoses
Some standard content:
National Standard of the People's Republic of China
General Specification for Corrugated Metallic Bose Assemblles
1 Subject Content and Scope of Application
GB/T 14525-93
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of corrugated metal hoses.
This standard applies to corrugated metal hoses (hereinafter referred to as hoses) used in pipeline engineering systems to compensate for displacement and installation deviations, absorb vibrations and reduce noise.
2 Reference standards
GB1220
GB3089
Packaging storage and transportation pictorial symbols
Technical parts for high-quality carbon structural steel
Carbon structural steel
Stainless steel bars
Stainless acid-resistant steel plates Thin-walled seamless steel pipes
GB 3280
GB3323
GB4226
GB 1239
GB4240
Stainless steel cold-rolled steel plate
Radiography and quality classification of steel fusion-welded butt joints Stainless steel cold-worked steel bars
Stainless steel and heat-resistant steel cold-rolled steel strip
Stainless steel wire
GB/T12469
Welding quality assurance Requirements and defect classification for steel fusion welding 3 Terminology
3.1 Tubular blank
Metallic tube with or without weld for the manufacture of bellows. 3.2 Corrugated tube
Tubular shell with corrugated busbars.
3.3 Helically corrugated tube Helically corrugated tube (see Figure 1). Figure 1
Approved by the State Administration of Technical Supervision on July 21, 1993 and implemented on March 1, 1994
3.4 Annularly corrugated tube
GB/T14525--93
Annularly corrugated tube
Corrugated tube with closed ring shape (see Figure 2). Figure 2
3.5 Braid
Metal braid on the outer surface of the corrugated tube (see Figure 3). Wire mesh sleeve
3.6 Hoseassembly
Combination of corrugated tube, braid and joint (see Figure 4) or combination of corrugated tube and joint. Note: Figure 4 shows a hose with a standard joint.
Corrugated tube
3.7 Bend radius
Bend radius measured along the axis of the hose.
3.8 Static bend radius static bend radius net
The bending radius allowed for the hose to work under a single bend. 3.9 Dynamic bend radius dynamie bend radius The bending radius allowed for the hose to work under repeated bends. 4 Product classification
4.1 Structure
4.1.1 Hoses are divided into the following four categories according to their pipe body and corrugation: a.
Annular corrugated hose made of seamless pipe body: spiral corrugated hose made of seamless pipe body; annular corrugated hose made of longitudinal seam welded pipe body; spiral corrugated hose made of longitudinal seam welded pipe body. h. Steel belt mesh
Flange joint
GB/T 14525-93
The materials of the main parts of the hose and their applicable working temperature range are shown in Table 2. Other materials can also be used according to the agreement between the supply and demand parties. Table 2
Parts name
Seamless corrugated pipe
Longitudinal seam welded corrugated pipe
Wire mesh sleeve
Steel strip mesh sleeve
5.3 Manufacturing
OCr19Ni9
00Cr17Ni14Mo2
OCr18Ni11Ti
ICr18Ni9Ti
OCr19Ni9
00Cr17Ni14Mo2
OCr18Ni11Ti
1Cr18Ni9Ti
Q235-A
Standard number
GB3069
CB4239
GB328G
GB4240||tt| |GB4239
GB1220
GB4226
Standard Name
Stainless Steel Acid Resistant Steel Plate Thin Seamless Pipe
Stainless Steel and Acid Resistant Steel Cold Rolled Steel
Stainless Steel Cold Rolled Steel Plate
Stainless Steel Wire
Stainless Steel and Acid Resistant Steel Cold Rolled Steel Strip
Stainless Steel Bar
Stainless Steel Cold Working Steel
Carbon Structural Steel
High Quality Carbon Steel
Technical Conditions
Working Temperature
-196~450
20~150
·20～300
5.3.1 Pipe is not allowed to have circumferential welds. The number of longitudinal welds shall comply with the provisions of Table 3. The minimum distance between adjacent longitudinal welds shall be greater than 200mm. 5.3.2 The limit deviation of the corrugated pipe shall comply with the provisions of Table 4. 5.3.3 The surface of the corrugated pipe shall not have defects such as delamination, bubbles, inclusions, oxide scale, rust spots, cracks, sharp pits, sharp folds, etc., nor shall it have indentations with a depth greater than the wall thickness or scratches with a depth greater than the lower deviation of the wall thickness. 5.3.4 The welding quality of the longitudinal weld shall comply with the requirements of Grade II in GB/T12469, and the welding quality of the circumferential weld shall comply with the requirements of Grade U in GB/T12469.
According to the agreement between the supplier and the buyer, the weld can be inspected by radiography according to the provisions of GB3323. Table 3
Nominal diameter
150~300
350600
Allowed longitudinal seam
Mechanical forming
Hydraulic forming
GB/T 14525--93
5.3.5 Brazed welds are not allowed to have defects such as cracks, pores, brazing flux impurities, etc. 5.3.6 The number of repairs on the same part of the weld is not allowed to exceed two times. Commercial
5.4 Appearance
5.4.1 The sealing surface of the hose connector is not allowed to have defects such as cracks, scratches, hair trees, sand gums, welding slag, etc. 5.4.2 The inner and outer surfaces of the hose should be clean and dry, and no rust, iron filings, etc. are allowed to exist. 5.4.3 The mesh sleeve and the bellows should fit together: the surface of the bellows is not allowed to have defects such as bumps and welding slag. 5.4.4 The total number of broken (missing) wires of the steel wire mesh sleeve should not exceed the requirements of Table 5, and the number of broken (missing) wires per strand should not exceed 1. Table 5
Nominal diameter
40~100
J25600
Mesh sleeve length, mm
Total number of broken (missing) wires
5.4.5 The mesh flowers of the steel belt mesh sleeve should be evenly distributed, and its surface should be flat and smooth, without defects such as folding and twisting. 5.5 Deviation on the ruler
5.5.1 The limit deviation of the hose length should comply with the requirements of Table 6. Hose length
Limit deviation
～8cu
-1 200
--2 000
5.5.2 Hose interface dimensions shall comply with the drawings or relevant standards. 5.6 Performance
5. 6.1 Performance parameters
Hose performance parameters are shown in Tables 7 and 8
～3 000
-3 000
~~1 000
5.6.2 Pressure resistance
GB/T 14525—93
Hose is tested at 1.5 times the nominal pressure, and no leakage or parts damage is allowed. 5.6.3 Airtightness
Hose is tested at the nominal pressure, and no air leakage is allowed. 5.6.4 Bending
5.6.4.1 Hoses with a nominal diameter not exceeding 80 mm shall be tested according to the minimum dynamic bending radius R specified in Table 7. The test results shall show no leakage or other abnormal phenomena.
5.6.4.2 For hoses with a nominal diameter greater than 80 mm, if testing is required, the test may be carried out in accordance with Appendix B (reference material). The bending angle and number of bending times shall be agreed upon by the supplier and the buyer. Qiu 7
(175)
According to the agreement between the supplier and the buyer
Minimum number of bending times
Minimum bending radius
5.6.5 Explosion
GB/T14525-93
The burst pressure value of the hose should not be less than that specified in Table 8. 6 Test method
The following tests should be carried out at room temperature.
6.1 Appearance inspection
The appearance of the hose is inspected by visual inspection.
6.2 Dimension inspection
GB/T 14525-93
The length and interface size of the hose are inspected by universal measuring tools. 6. 3 Pressure resistance test
6.3.1 The test medium is clean tap water, and its chloride ion content should not exceed 25ppm. 6.3.2 The test device is an electric or manual pump and a pressure gauge (the range is 1.5~4 times the test pressure, the same below). 6.3.3 Place the hose sample straight, install a plug with an exhaust valve on one end, and connect the other end to the pump outlet pipe. Inject water into the tube, exhaust all the air, close the exhaust valve, and then slowly increase the pressure to the specified value. 6.3.4 After maintaining the pressure for 5 minutes, check whether the sample has leakage and whether the parts are damaged. 6.4 Air tightness test
6.4.1 The hose that passes the pressure test should be subjected to an air tightness test. 6.4.2 The test medium is dry and clean air, and nitrogen or other inert gases can also be used according to user needs. 6.4.3 The test device is an electric pump (or gas cylinder group), a pressure gauge, and a water tank. 6.4.4 Install a plug on one end of the hose sample and connect the other end to the air inlet. Pass gas with a pressure equal to the nominal pressure and submerge the sample in the hand water tank. Remove the bubbles adsorbed on the mesh sleeve. 6.4.5 After 10 minutes of Perog, check whether the sample has leakage. 6.5 Bending test
6.5.1 The test medium is water or hydraulic oil.
6.5.2 The test equipment is a bending test bench, an electric or manual pump, and a pressure gauge. 6.5.3 The length of the hose sample shall be calculated according to the following provisions and selected within the specified limit deviation range. 6.5.3.1 The calculation method of the sample length is as follows: For hoses with a nominal diameter not greater than 80 mm, the sample length is calculated according to Formula 1: a.
L = 4R.+ A, + A, + S/2
Where: I. Hose sample length, mm;
R.—Hose minimum dynamic bending radius, mm
11A——-Hose sample rigid end length, mmS—α test stroke, 250 mm
h.·For hoses with a nominal diameter greater than 80I1II, the sample length shall be calculated according to Appendix B (reference). 6.5.3.2 The limit deviation of the sample length shall be 6 times the value specified in Table 6. (1)
6.5.4 For hoses with a nominal diameter not exceeding 80 mm, the specimens shall be installed according to Figure 5 and tested. For hoses with a nominal diameter exceeding 80 mm, the specimens shall be installed according to Appendix B (reference) and tested. 6.5.5 Start the electric or manual pump, inject water or hydraulic oil into the pipe, exhaust all the air, close the exhaust valve, and then slowly increase the pressure to 1.5 times the nominal pressure, and maintain the pressure for 1 minute: Check whether the hose specimen has leakage. 6.5.6 Release the pressure to the nominal pressure, start the bending test bench, and perform the bending test at a rate of 10 to 60 times/tnin. 6.5.7 After reaching the minimum number of bending times specified in Table 7, check whether the specimen has leakage or other abnormal phenomena. 6.6 Burst test
6.6.1 The test medium is clean tap water
GB/T14525---93
6.6.2 The test device is an electric or manual pump and a pressure gauge. 6.6-3 Place the hose sample in a straight position, install a plug with an exhaust valve on one end, and connect the other end to the pump outlet pipe. Inject water into the tube, exhaust all the air, and close the exhaust valve.
6.6.4 Slowly increase the pressure until the hose is broken, and record the breaking pressure and breaking condition of the sample. If the hose sample still bursts when the pressure exceeds the specified value, the test is not allowed to continue until the hose is broken. 7 Inspection rules
7.1 Inspection classification
Hose inspection is divided into factory inspection and type inspection, and its inspection items are specified in Table 9. 7.2 Factory inspection
7.2.1 Each hose should be inspected at the factory, and can only be shipped after passing the inspection. 7.2.2 During the factory inspection, if unqualified items are found, it is allowed to be repaired, and the number of times shall not exceed two times. Table 9
Note ")\" indicates that the test is to be carried out.
7.3 Type inspection
Technical requirements
Type inspection should be carried out in the following cases: New product trial production identification:
Test method
Factory inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; every three years of normal production;
When the product is discontinued for more than one year and then resumed: National Quality Supervision and Inspection Commission When the organization proposes the requirement of type inspection. Type inspection
GB/T14525-93
7.3.2 The hose samples for type inspection shall be randomly selected from the hoses that have passed the factory inspection, and the number shall be 3. The number of samples may also be increased according to the requirements of the purchaser. 7.3.3 The order of type inspection shall be as specified in Table 10. Table 10
Sample number
Factory inspection
Note: ①“O\” indicates that the test is carried out. Bending test
②For hoses with a nominal diameter greater than 80mm, samples 2 and 3 are allowed to be subjected to burst test as sample 1. Burst test
7.3.4 If unqualified items are found in the type inspection results, double the number of samples shall be re-drawn for re-inspection of unqualified items. If there are still unqualified items in the re-inspection results, the type inspection shall be judged as unqualified. 8 Marking, packaging, transportation, storage
8.1 Each hose should be marked with the product model, trademark, manufacturer name and manufacturing date (or batch number). 8.2 The hose should have a product certificate and product instructions. 8.3 Both ends of the hose should be dust-proof.
8.4 If the hose is packed in a box, the box should be marked with: a.
Manufacturer name;
Product name;
Trademark;
d. Product model:
Manufacture date;
Product standard number;
8.5 The marking of the box should comply with the provisions of GB191. 8.6 There should be a packing list in the box, and a spare parts list if spare parts are required. 8.7 The hose should be protected from collision and direct attack by rain and snow during transportation. 8.8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".1 The test medium is clean tap water, and its chloride ion content should not exceed 25ppm. 6.3.2 The test device is an electric or manual pump and a pressure gauge (the range is 1.5~4 times the test pressure, the same below). 6.3.3 Place the hose sample flat, install a plug with an exhaust valve on one end, and connect the other end to the pump outlet pipe. Inject water into the tube, exhaust the air, close the exhaust valve, and then slowly increase the pressure to the specified value. 6.3.4 After maintaining the pressure for 5 minutes, check whether the sample has leakage and whether the parts are damaged. 6.4 Airtightness test
6.4.1 The hose that has passed the pressure test should be subjected to an airtightness test. 6.4.2 The test medium is dry and clean air, and nitrogen or other inert gases can also be used according to user needs. 6.4.3 The test device is an electric pump (or gas cylinder group), a pressure gauge, and a water tank. 6.4.4 Install a plug on one end of the hose sample and connect the other end to the air inlet. Pass gas with a pressure equal to the nominal pressure and submerge the sample in a hand sink. Remove the bubbles adsorbed on the mesh. 6.4.5 Check the sample for leaks after 10 minutes. 6.5 Bending test
6.5.1 The test medium is water or hydraulic oil.
6.5.2 The test device is a bending test bench, an electric or manual pump, and a pressure gauge. 6.5.3 The length of the hose sample should be calculated according to the following provisions and selected within the specified limit deviation range. 6.5.3.1 The calculation method of the sample length is as follows: For hoses with a nominal diameter not greater than 80 mm, the sample length is calculated according to Formula 1: a.
L = 4R.+ A, + A, + S/2
Where: I. Hose sample length, mm;
R.—Hose minimum dynamic bending radius, mm
11A—Hose sample rigid end length, mmS—α test stroke, 250 mm
h.·For hoses with a nominal diameter greater than 80 mm, the sample length is calculated according to Appendix B (reference). 6.5.3.2 The limit deviation of the sample length shall be 6 times the value specified in Table 6. (1)
6.5.4 For hoses with a nominal diameter not greater than 80 mm, the sample shall be installed and tested according to Figure 5. For hoses with a nominal diameter greater than 80 mm, the sample shall be installed and tested according to Appendix B (reference). 6.5.5 Start the electric or manual pump, inject water or hydraulic oil into the pipe, exhaust all the air, close the exhaust valve, and then slowly increase the pressure to 1.5 times the nominal pressure, maintain the pressure for 1min: Check whether the hose sample has leakage. 6.5.6 Reduce the pressure to the nominal pressure, start the bending test bench, and perform the bending test at a rate of 10 to 60 times/tnin. 6.5.7 After reaching the minimum number of bending times specified in Table 7, check whether the sample has leakage or other abnormal phenomena. 6.6 Burst test
6.6.1 The test medium is clean tap water
GB/T14525---93
6.6.2 The test device is an electric or manual pump and a pressure gauge. 6.6-3 Place the hose sample flat, install a plug with an exhaust valve at one end, and connect the other end to the pump outlet pipe to inject water into the pipe, exhaust all the air, and close the exhaust valve.
6.6.4 Slowly increase the pressure until the hose is broken, and record the breaking pressure and breaking condition of the sample. If the hose sample still bursts when the pressure exceeds the specified value, the test is not allowed to continue until the hose is broken. 7 Inspection rules
7.1 Inspection classification
Hose inspection is divided into factory inspection and type inspection, and its inspection items are specified in Table 9. 7.2 Factory inspection
7.2.1 Each hose shall be inspected at the factory and can only be shipped after passing the inspection. 7.2.2 During the factory inspection, if unqualified items are found, it is allowed to be repaired, and the number of times shall not exceed two times. Table 9
Note ")\" indicates that the test is to be carried out.
7.3 Type inspection
Technical requirements
Type inspection should be carried out in the following cases: New product trial production identification:
Test method
Factory inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; every three years of normal production;
When the product is discontinued for more than one year and then resumed: National Quality Supervision and Inspection Commission When the organization proposes the requirement of type inspection. Type inspection
GB/T14525-93
7.3.2 The hose samples for type inspection shall be randomly selected from the hoses that have passed the factory inspection, and the number shall be 3. The number of samples may also be increased according to the requirements of the purchaser. 7.3.3 The order of type inspection shall be as specified in Table 10. Table 10
Sample number
Factory inspection
Note: ①“O\” indicates that the test is carried out. Bending test
②For hoses with a nominal diameter greater than 80mm, samples 2 and 3 are allowed to be subjected to burst test as sample 1. Burst test
7.3.4 If unqualified items are found in the type inspection results, double the number of samples shall be re-drawn for re-inspection of unqualified items. If there are still unqualified items in the re-inspection results, the type inspection shall be judged as unqualified. 8 Marking, packaging, transportation, storage
8.1 Each hose should be marked with the product model, trademark, manufacturer name and manufacturing date (or batch number). 8.2 The hose should have a product certificate and product instructions. 8.3 Both ends of the hose should be dust-proof.
8.4 If the hose is packed in a box, the box should be marked with: a.
Manufacturer name;
Product name;
Trademark;
d. Product model:
Manufacture date;
Product standard number;
8.5 The marking of the box should comply with the provisions of GB191. 8.6 There should be a packing list in the box, and a spare parts list if spare parts are required. 8.7 The hose should be protected from collision and direct attack by rain and snow during transportation. 8.8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".1 The test medium is clean tap water, and its chloride ion content should not exceed 25ppm. 6.3.2 The test device is an electric or manual pump and a pressure gauge (the range is 1.5~4 times the test pressure, the same below). 6.3.3 Place the hose sample flat, install a plug with an exhaust valve on one end, and connect the other end to the pump outlet pipe. Inject water into the tube, exhaust the air, close the exhaust valve, and then slowly increase the pressure to the specified value. 6.3.4 After maintaining the pressure for 5 minutes, check whether the sample has leakage and whether the parts are damaged. 6.4 Airtightness test
6.4.1 The hose that has passed the pressure test should be subjected to an airtightness test. 6.4.2 The test medium is dry and clean air, and nitrogen or other inert gases can also be used according to user needs. 6.4.3 The test device is an electric pump (or gas cylinder group), a pressure gauge, and a water tank. 6.4.4 Install a plug on one end of the hose sample and connect the other end to the air inlet. Pass gas with a pressure equal to the nominal pressure and submerge the sample in a hand sink. Remove the bubbles adsorbed on the mesh. 6.4.5 Check the sample for leaks after 10 minutes. 6.5 Bending test
6.5.1 The test medium is water or hydraulic oil.
6.5.2 The test device is a bending test bench, an electric or manual pump, and a pressure gauge. 6.5.3 The length of the hose sample should be calculated according to the following provisions and selected within the specified limit deviation range. 6.5.3.1 The calculation method of the sample length is as follows: For hoses with a nominal diameter not greater than 80 mm, the sample length is calculated according to Formula 1: a.
L = 4R.+ A, + A, + S/2
Where: I. Hose sample length, mm;
R.—Hose minimum dynamic bending radius, mm
11A—Hose sample rigid end length, mmS—α test stroke, 250 mm
h.·For hoses with a nominal diameter greater than 80 mm, the sample length is calculated according to Appendix B (reference). 6.5.3.2 The limit deviation of the sample length shall be 6 times the value specified in Table 6. (1)
6.5.4 For hoses with a nominal diameter not greater than 80 mm, the sample shall be installed and tested according to Figure 5. For hoses with a nominal diameter greater than 80 mm, the sample shall be installed and tested according to Appendix B (reference). 6.5.5 Start the electric or manual pump, inject water or hydraulic oil into the pipe, exhaust all the air, close the exhaust valve, and then slowly increase the pressure to 1.5 times the nominal pressure, maintain the pressure for 1min: Check whether the hose sample has leakage. 6.5.6 Reduce the pressure to the nominal pressure, start the bending test bench, and perform the bending test at a rate of 10 to 60 times/tnin. 6.5.7 After reaching the minimum number of bending times specified in Table 7, check whether the sample has leakage or other abnormal phenomena. 6.6 Burst test
6.6.1 The test medium is clean tap water
GB/T14525---93
6.6.2 The test device is an electric or manual pump and a pressure gauge. 6.6-3 Place the hose sample flat, install a plug with an exhaust valve at one end, and connect the other end to the pump outlet pipe to inject water into the pipe, exhaust all the air, and close the exhaust valve.
6.6.4 Slowly increase the pressure until the hose is broken, and record the breaking pressure and breaking condition of the sample. If the hose sample still bursts when the pressure exceeds the specified value, the test is not allowed to continue until the hose is broken. 7 Inspection rules
7.1 Inspection classification
Hose inspection is divided into factory inspection and type inspection, and its inspection items are specified in Table 9. 7.2 Factory inspection
7.2.1 Each hose shall be inspected at the factory and can only be shipped after passing the inspection. 7.2.2 During the factory inspection, if unqualified items are found, it is allowed to be repaired, and the number of times shall not exceed two times. Table 9
Note ")\" indicates that the test is to be carried out.
7.3 Type inspection
Technical requirements
Type inspection should be carried out in the following cases: New product trial production identification:
Test method
Factory inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; every three years of normal production;
When the product is discontinued for more than one year and then resumed: National Quality Supervision and Inspection Commission When the organization proposes the requirement of type inspection. Type inspection
GB/T14525-93
7.3.2 The hose samples for type inspection shall be randomly selected from the hoses that have passed the factory inspection, and the number shall be 3. The number of samples may also be increased according to the requirements of the purchaser. 7.3.3 The order of type inspection shall be as specified in Table 10. Table 10
Sample number
Factory inspection
Note: ①“O\” indicates that the test is carried out. Bending test
②For hoses with a nominal diameter greater than 80mm, samples 2 and 3 are allowed to be subjected to burst test as sample 1. Burst test
7.3.4 If unqualified items are found in the type inspection results, double the number of samples shall be re-drawn for re-inspection of unqualified items. If there are still unqualified items in the re-inspection results, the type inspection shall be judged as unqualified. 8 Marking, packaging, transportation, storage
8.1 Each hose should be marked with the product model, trademark, manufacturer name and manufacturing date (or batch number). 8.2 The hose should have a product certificate and product instructions. 8.3 Both ends of the hose should be dust-proof.
8.4 If the hose is packed in a box, the box should be marked with: a.
Manufacturer name;
Product name;
Trademark;
d. Product model:
Manufacture date;
Product standard number;
8.5 The marking of the box should comply with the provisions of GB191. 8.6 There should be a packing list in the box, and a spare parts list if spare parts are required. 8.7 The hose should be protected from collision and direct attack by rain and snow during transportation. 8.8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".4 Install a plug on one end of the hose sample and connect the other end to the air inlet. Pass gas with a pressure equal to the nominal pressure and submerge the sample in a hand water tank. Remove the bubbles adsorbed on the mesh sleeve. 6.4.5 Check the sample for air leakage after 10 minutes. 6.5 Bending test
6.5.1 The test medium is water or hydraulic oil.
6.5.2 The test device is a bending test bench, an electric or manual pump, and a pressure gauge. 6.5.3 The length of the hose sample should be calculated according to the following regulations and selected within the specified limit deviation range. 6.5.3.1 The calculation method of the sample length is as follows: For hoses with a nominal diameter not greater than 80 mm, the sample length is calculated according to Formula 1: a.
L = 4R.+ A, + A, + S/2
Where: I. Hose sample length, mm;
R.—Hose minimum dynamic bending radius, mm
11A—Hose sample rigid end length, mmS—α test stroke, 250 mm
h.·For hoses with a nominal diameter greater than 80 mm, the sample length is calculated according to Appendix B (reference). 6.5.3.2 The limit deviation of the sample length shall be 6 times the value specified in Table 6. (1)
6.5.4 For hoses with a nominal diameter not greater than 80 mm, the sample shall be installed and tested according to Figure 5. For hoses with a nominal diameter greater than 80 mm, the sample shall be installed and tested according to Appendix B (reference). 6.5.5 Start the electric or manual pump, inject water or hydraulic oil into the pipe, exhaust all the air, close the exhaust valve, and then slowly increase the pressure to 1.5 times the nominal pressure, maintain the pressure for 1min: Check whether the hose sample has leakage. 6.5.6 Reduce the pressure to the nominal pressure, start the bending test bench, and perform the bending test at a rate of 10 to 60 times/tnin. 6.5.7 After reaching the minimum number of bending times specified in Table 7, check whether the sample has leakage or other abnormal phenomena. 6.6 Burst test
6.6.1 The test medium is clean tap water
GB/T14525---93
6.6.2 The test device is an electric or manual pump and a pressure gauge. 6.6-3 Place the hose sample flat, install a plug with an exhaust valve at one end, and connect the other end to the pump outlet pipe to inject water into the pipe, exhaust all the air, and close the exhaust valve.
6.6.4 Slowly increase the pressure until the hose is broken, and record the breaking pressure and breaking condition of the sample. If the hose sample still bursts when the pressure exceeds the specified value, the test is not allowed to continue until the hose is broken. 7 Inspection rules
7.1 Inspection classification
Hose inspection is divided into factory inspection and type inspection, and its inspection items are specified in Table 9. 7.2 Factory inspection
7.2.1 Each hose shall be inspected at the factory and can only be shipped after passing the inspection. 7.2.2 During the factory inspection, if unqualified items are found, it is allowed to be repaired, and the number of times shall not exceed two times. Table 9
Note ")\" indicates that the test is to be carried out.
7.3 Type inspection
Technical requirements
Type inspection should be carried out in the following cases: New product trial production identification:
Test method
Factory inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; every three years of normal production;
When the product is discontinued for more than one year and then resumed: National Quality Supervision and Inspection Commission When the organization proposes the requirement of type inspection. Type inspection
GB/T14525-93
7.3.2 The hose samples for type inspection shall be randomly selected from the hoses that have passed the factory inspection, and the number shall be 3. The number of samples may also be increased according to the requirements of the purchaser. 7.3.3 The order of type inspection shall be as specified in Table 10. Table 10
Sample number
Factory inspection
Note: ①“O\” indicates that the test is carried out. Bending test
②For hoses with a nominal diameter greater than 80mm, samples 2 and 3 are allowed to be subjected to burst test as sample 1. Burst test
7.3.4 If unqualified items are found in the type inspection results, double the number of samples shall be re-drawn for re-inspection of unqualified items. If there are still unqualified items in the re-inspection results, the type inspection shall be judged as unqualified. 8 Marking, packaging, transportation, storage
8.1 Each hose should be marked with the product model, trademark, manufacturer name and manufacturing date (or batch number). 8.2 The hose should have a product certificate and product instructions. 8.3 Both ends of the hose should be dust-proof.
8.4 If the hose is packed in a box, the box should be marked with: a.
Manufacturer name;
Product name;
Trademark;
d. Product model:
Manufacture date;
Product standard number;
8.5 The marking of the box should comply with the provisions of GB191. 8.6 There should be a packing list in the box, and a spare parts list if spare parts are required. 8.7 The hose should be protected from collision and direct attack by rain and snow during transportation. 8.8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".4 Install a plug on one end of the hose sample and connect the other end to the air inlet. Pass gas with a pressure equal to the nominal pressure and submerge the sample in a hand water tank. Remove the bubbles adsorbed on the mesh sleeve. 6.4.5 Check the sample for air leakage after 10 minutes. 6.5 Bending test
6.5.1 The test medium is water or hydraulic oil.
6.5.2 The test device is a bending test bench, an electric or manual pump, and a pressure gauge. 6.5.3 The length of the hose sample should be calculated according to the following regulations and selected within the specified limit deviation range. 6.5.3.1 The calculation method of the sample length is as follows: For hoses with a nominal diameter not greater than 80 mm, the sample length is calculated according to Formula 1: a.
L = 4R.+ A, + A, + S/2
Where: I. Hose sample length, mm;
R.—Hose minimum dynamic bending radius, mm
11A—Hose sample rigid end length, mmS—α test stroke, 250 mm
h.·For hoses with a nominal diameter greater than 80 mm, the sample length is calculated according to Appendix B (reference). 6.5.3.2 The limit deviation of the sample length shall be 6 times the value specified in Table 6. (1)
6.5.4 For hoses with a nominal diameter not greater than 80 mm, the sample shall be installed and tested according to Figure 5. For hoses with a nominal diameter greater than 80 mm, the sample shall be installed and tested according to Appendix B (reference). 6.5.5 Start the electric or manual pump, inject water or hydraulic oil into the pipe, exhaust all the air, close the exhaust valve, and then slowly increase the pressure to 1.5 times the nominal pressure, maintain the pressure for 1min: Check whether the hose sample has leakage. 6.5.6 Reduce the pressure to the nominal pressure, start the bending test bench, and perform the bending test at a rate of 10 to 60 times/tnin. 6.5.7 After reaching the minimum number of bending times specified in Table 7, check whether the sample has leakage or other abnormal phenomena. 6.6 Burst test
6.6.1 The test medium is clean tap water
GB/T14525---93
6.6.2 The test device is an electric or manual pump and a pressure gauge. 6.6-3 Place the hose sample flat, install a plug with an exhaust valve at one end, and connect the other end to the pump outlet pipe to inject water into the pipe, exhaust all the air, and close the exhaust valve.
6.6.4 Slowly increase the pressure until the hose is broken, and record the breaking pressure and breaking condition of the sample. If the hose sample still bursts when the pressure exceeds the specified value, the test is not allowed to continue until the hose is broken. 7 Inspection rules
7.1 Inspection classification
Hose inspection is divided into factory inspection and type inspection, and its inspection items are specified in Table 9. 7.2 Factory inspection
7.2.1 Each hose shall be inspected at the factory and can only be shipped after passing the inspection. 7.2.2 During the factory inspection, if unqualified items are found, it is allowed to be repaired, and the number of times shall not exceed two times. Table 9
Note ")\" indicates that the test is to be carried out.
7.3 Type inspection
Technical requirements
Type inspection should be carried out in the following cases: New product trial production identification:
Test method
Factory inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; every three years of normal production;
When the product is discontinued for more than one year and then resumed: National Quality Supervision and Inspection Commission When the organization proposes the requirement of type inspection. Type inspection
GB/T14525-93
7.3.2 The hose samples for type inspection shall be randomly selected from the hoses that have passed the factory inspection, and the number shall be 3. The number of samples may also be increased according to the requirements of the purchaser. 7.3.3 The order of type inspection shall be as specified in Table 10. Table 10
Sample number
Factory inspection
Note: ①“O\” indicates that the test is carried out. Bending test
②For hoses with a nominal diameter greater than 80mm, samples 2 and 3 are allowed to be subjected to burst test as sample 1. Burst test
7.3.4 If unqualified items are found in the type inspection results, double the number of samples shall be re-drawn for re-inspection of unqualified items. If there are still unqualified items in the re-inspection results, the type inspection shall be judged as unqualified. 8 Marking, packaging, transportation, storage
8.1 Each hose should be marked with the product model, trademark, manufacturer name and manufacturing date (or batch number). 8.2 The hose should have a product certificate and product instructions. 8.3 Both ends of the hose should be dust-proof.
8.4 If the hose is packed in a box, the box should be marked with: a.
Manufacturer name;
Product name;
Trademark;
d. Product model:
Manufacture date;
Product standard number;
8.5 The marking of the box should comply with the provisions of GB191. 8.6 There should be a packing list in the box, and a spare parts list if spare parts are required. 8.7 The hose should be protected from collision and direct attack by rain and snow during transportation. 8.8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".7 After reaching the minimum number of bends specified in Table 7, check whether the sample has leakage or other abnormal phenomena. 6.6 Burst test
6.6.1 The test medium is clean tap water
GB/T14525---93
6.6.2 The test device is an electric or manual pump and a pressure gauge. 6.6-3 Place the hose sample flat, install a plug with an exhaust valve at one end, and connect the other end to the pump outlet pipe to inject water into the pipe, exhaust the air, and close the exhaust valve.
6.6.4 Slowly increase the pressure until the hose is broken, and record the breaking pressure and breaking situation of the sample. If the hose sample is still stuck and burst when the pressure exceeds the specified value, it is allowed not to continue the test until the hose is broken. 7 Inspection rules
7.1 Inspection classification
Hose inspection is divided into factory inspection and type inspection, and its inspection items are specified in Table 9. 7.2 Factory inspection
7.2.1 Each hose shall be inspected at the factory and can only be shipped after passing the inspection. 7.2.2 During the factory inspection, if unqualified items are found, they are allowed to be repaired, and the number of times shall not exceed twice. Table 9
Note ")\ indicates that this test is carried out.
7.3 Type inspection
Technical requirements
Type inspection should be carried out in any of the following situations: New product trial production identification:
Test method
Factory inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; every three years of normal production;
When the product is discontinued for more than one year and then resumed: National Quality Supervision and Inspection Commission When the organization proposes the requirement of type inspection. Type inspection
GB/T14525-93
7.3.2 The hose samples for type inspection shall be randomly selected from the hoses that have passed the factory inspection, and the number shall be 3. The number of samples may also be increased according to the requirements of the purchaser. 7.3.3 The order of type inspection shall be as specified in Table 10. Table 10
Sample number
Factory inspection
Note: ①“O\” indicates that the test is carried out. Bending test
②For hoses with a nominal diameter greater than 80mm, samples 2 and 3 are allowed to be subjected to burst test as sample 1. Burst test
7.3.4 If unqualified items are found in the type inspection results, double the number of samples shall be re-drawn for re-inspection of unqualified items. If there are still unqualified items in the re-inspection results, the type inspection shall be judged as unqualified. 8 Marking, packaging, transportation, storage
8.1 Each hose should be marked with the product model, trademark, manufacturer name and manufacturing date (or batch number). 8.2 The hose should have a product certificate and product instructions. 8.3 Both ends of the hose should be dust-proof.
8.4 If the hose is packed in a box, the box should be marked with: a.
Manufacturer name;
Product name;
Trademark;
d. Product model:
Manufacture date;
Product standard number;
8.5 The marking of the box should comply with the provisions of GB191. 8.6 There should be a packing list in the box, and a spare parts list if spare parts are required. 8.7 The hose should be protected from collision and direct attack by rain and snow during transportation. 8.8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".7 After reaching the minimum number of bends specified in Table 7, check whether the sample has leakage or other abnormal phenomena. 6.6 Burst test
6.6.1 The test medium is clean tap water
GB/T14525---93
6.6.2 The test device is an electric or manual pump and a pressure gauge. 6.6-3 Place the hose sample flat, install a plug with an exhaust valve at one end, and connect the other end to the pump outlet pipe to inject water into the pipe, exhaust the air, and close the exhaust valve.
6.6.4 Slowly increase the pressure until the hose is broken, and record the breaking pressure and breaking situation of the sample. If the hose sample is still stuck and burst when the pressure exceeds the specified value, it is allowed not to continue the test until the hose is broken. 7 Inspection rules
7.1 Inspection classification
Hose inspection is divided into factory inspection and type inspection, and its inspection items are specified in Table 9. 7.2 Factory inspection
7.2.1 Each hose shall be inspected at the factory and can only be shipped after passing the inspection. 7.2.2 During the factory inspection, if unqualified items are found, they are allowed to be repaired, and the number of times shall not exceed twice. Table 9
Note ")\ indicates that this test is carried out.
7.3 Type inspection
Technical requirements
Type inspection should be carried out in any of the following situations: New product trial production identification:
Test method
Factory inspection
After formal production, if there are major changes in structure, materials, and processes that may affect product performance; every three years of normal production;
When the product is discontinued for more than one year and then resumed: National Quality Supervision and Inspection Commission When the organization proposes the requirement of type inspection. Type inspection
GB/T14525-93
7.3.2 The hose samples for type inspection shall be randomly selected from the hoses that have passed the factory inspection, and the number shall be 3. The number of samples may also be increased according to the requirements of the purchaser. 7.3.3 The order of type inspection shall be as specified in Table 10. Table 10
Sample number
Factory inspection
Note: ①“O\” indicates that the test is carried out. Bending test
②For hoses with a nominal diameter greater than 80mm, samples 2 and 3 are allowed to be subjected to burst test as sample 1. Burst test
7.3.4 If unqualified items are found in the type inspection results, double the number of samples shall be re-drawn for re-inspection of unqualified items. If there are still unqualified items in the re-inspection results, the type inspection shall be judged as unqualified. 8 Marking, packaging, transportation, storage
8.1 Each hose should be marked with the product model, trademark, manufacturer name and manufacturing date (or batch number). 8.2 The hose should have a product certificate and product instructions. 8.3 Both ends of the hose should be dust-proof.
8.4 If the hose is packed in a box, the box should be marked with: a.
Manufacturer name;
Product name;
Trademark;
d. Product model:
Manufacture date;
Product standard number;
8.5 The marking of the box should comply with the provisions of GB191. 8.6 There should be a packing list in the box, and a spare parts list if spare parts are required. 8.7 The hose should be protected from collision and direct attack by rain and snow during transportation. 8.8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:Www.bzxZ.net
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —Working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".8 The hose should be stored in a dry, ventilated warehouse without corrosive gas. A1 Calculation formula
GB/T 14525-93
Appendix A
Working pressure at high temperature
(reference)
The working pressure at high temperature is calculated according to formula A1: P.-KPN
In the formula, P. —Working pressure, MPa;
PN--nominal pressure, MPa!
K—humidity correction coefficient.
Temperature specific coefficient
A2.1 The temperature correction coefficient of the bellows mesh sleeve is specified in Table A1. Table Al
Material brand
UCr18NiliT:
00Cr17Ni14Mo2
2The temperature correction coefficient of the joint shall be specified in the corresponding joint mark. A2.2
A2.3 The temperature correction coefficient of the hose should be determined according to the temperature correction coefficient of the bellows, mesh sleeve and joint, and the smaller value should be taken. Appendix B
Hose swing bending test
(reference)
B1 Specimen length
The length of the hose specimen for the slow bending test is calculated according to formula B1: L = TR./180°+ 4DN + A, + 21e Where: L--hose specimen length, mm; a Hose specimen bending angle: (\);
R.--Hose minimum dynamic bending radius, im, DN-Hose nominal diameter, mm;
A,, A.Hose specimen rigid end length, mm. B2 Specimen installation
Hose specimens are installed as shown in the figure below. (A)
....- (B1)
Additional instructions:
This standard is proposed by the Ministry of Aerospace Industry. GB/T 14525-93
This standard was drafted by Nanjing Chenguang Machinery Factory, with participation from Beijing Capital Machinery Factory, Shenyang Fu·Tai Metal Bellows Co., Ltd. and Shenyang National Instrument Components Quality Inspection Center. The main drafters of this standard are Ren Chibing, Xu Changrong and Yu Zhonghai. This standard refers to the British standard BS6501 Part 11984 "Technical Conditions for Corrugated Metal Hose".
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