Some standard content:
ICS.47.020.30
Registration No.: 7711—2000
Ship Industry Standard of the People's Republic of China
CB/T 679—2000www.bzxz.net
Replaces CB/T226-1999CB679-68
Hose clamp
Rubberpipeclamp
200009-20Promulgated
Commission of Science, Technology and Industry for National Defense
Implementation on 2001-01-01
CB/T679-2000
This standard is revised and merged by CB/T226-1999 "Marine hose clamp" and CB679-68 "Block-type hose clamp". This standard specifies the requirements and test methods for the clamp's operability, strength, clamping performance, etc., to make it easier to implement. This standard retains the A, B, C type clamps of CB/T226-1999 and the block clamps of CB679-68. The inner diameter of the B type clamp in CB/T226-1999 is widened from 31~120mm to 31145mm; welded C type and pressed D type are added; stainless steel is added as the material.
This standard replaces CB/T226-1999 and CB679-68 from the date of implementation. This standard is proposed by the Pipe Accessories Sub-Technical Committee of the National Technical Committee for Standardization of Marine Machinery. This standard is under the jurisdiction of the China Shipbuilding Industry Comprehensive Technology and Economic Research Institute. This standard was drafted by Wuhu Shipyard and participated by Tianjin Tanggu Machinery Parts Factory. The main drafters of this standard are Ji Xishan, Xia Yunqing and Gao Junbao. CB226 was first issued in 1961 (Marine General Equipment Atlas CSC226-61), revised for the first time in 1965 (National Standard GB566-65), and revised for the second time in January 1983 (National Standard GB566-83); in June 1999, it was directly adjusted from GB556-83 to the industry standard CB/T226-1999. CB679 was first issued in 1968.
1 Scope
CB/T679-2000
Hose clamps
This standard specifies the classification, requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of marine hose clamps (hereinafter referred to as clamps).
This standard applies to the manufacture, inspection and acceptance of clamps used to connect hoses in ship pipelines with a pressure not higher than 1.0MPa. 2 Cited standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. CB/Z54-81 Electrolytic galvanizing
3 Classification
3.1 The types of clamps are divided into:
Type A—
--a spiral copper clamp;
Type BG-
Type BGT
Type BN-
Type BNT-
Type CG-
Type DN-
--a base-type carbon steel spiral clamp;
|Base-type carbon steel through-hole spiral clamp:
-Base-type stainless steel spiral clamp
Base-type stainless steel through-hole spiral clamp;
Welded carbon steel spiral clamp;
Welded stainless steel explosive spiral clamp;
Compression-type carbon steel spiral clamp:
-Compression-type stainless steel spiral clamp;
Ear plate type wire clamp;
-Tight block type stainless steel clamp.
3.2The structural dimensions of type A clamp are shown in Figure 1 and Table 1. A
1-Strap; 2-Retaining ring; 3-Bolt
Figure 1A clamp
Clamping inner diameter
CB/T 679—2000
Table 1 Structural dimensions of type A clamp
Nominal pressure PN
Applicable hose inner diameter
3.3 The structural dimensions of type BG, BGT, BN, and BNT clamps are shown in Figure 2 and Table 2.SD
1-belt; 2-rod; 3-base; 4-shellFigure 2 BG, BGT, BN, and BTT clamps
2 BG, BG Structural dimensions of T, BN, BNT type clamps
Clamp inner diameter
31~40
91~105
114~125
130145
Applicable hose inner diameter
100~110
120~130
Nominal pressure PN
Thickness:
CB/T 679—2000
3.4 The structural dimensions of CG and CN type clamps are shown in Figure 3 and Table 3. 1-Band; 2-Worm; 3-Cover
Figure 3 CG and CN type clamps
Table 3 The structural dimensions of CG, CN, DG and DN type clamps Inner diameter of clamp
91~105
Applicable inner diameter of hose
Nominal pressure PN
3.5 The structural dimensions of DG and DN type clamps are shown in Figure 4 and Table 3.12
1-Band; 2-Worm; 3-Cover
Figure 4 DG and DN type clamps
CG, DG.C N, DN
3.6The structural dimensions of E-type clamp are shown in Figure 5 and Table 4CB/T679-2000
1-steel wire; 2-ear plate; 3-bolt: 4-nutFigure 5E-type clamp
Structural dimensions of E-type clamp box
Inner diameter of clamp
Applicable inner diameter of hose
50, 55
58, 60
65, 70
75, 80
100, 102
Nominal pressure PN
Wire diameter
3.7The structural dimensions of F-type clamp are shown in Figure 6 and Table 5. CB/T679—2000
1 Band; 2 Bolt: 3 Retaining ring; 4 Straight-through clamp: 5 Threaded clamp Figure 6 F-type clamp
Table 5 Structural dimensions of F-type clamp
Inner diameter of clamp
3.8 Marking example
Applicable inner diameter of hose
115~140
140~160
160~180
180~230
230~280
2 80~328
328~370
370～420
Nominal pressure
The spiral copper clamp with an inner diameter of 21~30mm is marked as: clamp A30CB/T679-2000
The base-type stainless steel through-hole spiral clamp with an inner diameter of 31~40mm is marked as clamp BNT40CB/T679-2000
4 Requirements
4.1 The materials of the main parts of the clamp shall be as specified in Table 6. With
Parts name
BG, BGT, BN, BNT,
CG, CN, DG, DN type
Cover, base, buckle, ear plate
Scorpion rod, tightening block
Bolt, nut
4.2 Surface quality
CB/T 679—2000
Qiu6 Materials of main parts of clamp
Brass strip
Carbon structural steel strip
Stainless steel strip
Galvanized steel wire
Stainless steel strip
Carbon structural steel
Stainless steel strip
High-quality carbon structural steel
Stainless steel rod
Carbon round steel for standard parts
Stainless steel wrench
1Cr18Nig
SZ, Class I, Grade F
1Cr18Ni9
1Cr18Nig
1Cr18Nig
1Cr18Nig
4.2.1 All parts of the clamp should be smooth and flat, and defects such as burrs and sharp angles are not allowed. Standard number
GB/T2059-2000
GB/T716-1991
GB/T4239-1991
GB/T343-1994
GB/T42 39-1991
GB/T716-1991
GB/T42391991
GB/T699-2000
GB/T1220-1992
GB/T 715-1989
GB/T1220-1992
4.2.2 The surface of carbon steel clamp parts should be polished and galvanized. The galvanizing requirements shall be in accordance with the provisions of CB'/Z54. The galvanized surface should not have defects such as black spots, bubbles, cracks, peeling and scratches.
4.3 Operability
When the clamp is in a free state, the worm (bolt) should be flexible and easy to screw, and the torque should not exceed 1.5Nm. The clamp should be tightened or loosened smoothly.
4.4 Strength
When the clamp is in a tightened state, when the worm (bolt) torque reaches the requirements of Table 7, the clamp should not break, and other parts should not have permanent deformation.
Clamp torque test value
Clamp inner diameter D
21~450
Clamp performance
Torque test value
When the clamp is in the clamped state, the worm (bolt) screwing torque is the value specified in Table 7, and the liquid pressure in the clamped hose is 1.5 times the nominal pressure, the clamp should not be damaged or there should be liquid leakage at the clamping point. 5 Test method
5.1 Dimension inspection
Measure the structural dimensions of the clamp with appropriate measuring tools in the maximum free state and the clamping state. The results should meet the requirements of 3.2~3.7 respectively.
5.2 Material inspection
CB/T679—2000
Clamp materials are inspected by checking their factory certificates. The results should meet the requirements of 4.1. 5.3 Surface quality inspection
The surface quality of the clamp is inspected by naked eyes. The results shall meet the requirements of 4.2. 5.4 Operability inspection
Use a torque-controlled screwdriver (or wrench) and visual inspection. The results shall meet the requirements of 4.3. 5.5 Strength test
5.5.1 Test conditions
Install the clamp on a rigid mandrel with a mandrel diameter equal to the inner diameter of the clamp, and use a special torque test device to perform a torque test. 5.5.2 Test method
Tighten the clamp to the test value specified in the torque test of 7 and hold for 2 minutes. Then release the clamp and visually inspect the appearance of the clamp. The results shall meet the requirements of 4.4.
5.6 Clamping performance test
5.6.1 Test conditions
a) The ambient temperature is room temperature:
b) The test medium is water or hydraulic oil at room temperature; c) The selected hose should match the clamp to be tested, and be equipped with a test load and a booster. Test device Figure 7. Hydraulic joint
Annular groove
5.6.2 Test method
Figure 7 Test device
a) Install the hose and clamp on a metal mandrel with a matching diameter and a smooth surface. When tightening the clamp, the torque used should not exceed 75% of the torque test value allowed by the corresponding clamp specified in Table 7. b) During the test, the pressure should be gradually increased from low to high, and the maximum pressure increase rate should be controlled within 10°Pa/s. When the applied pressure is close to the corresponding allowable pressure test of the clamp (1.5 times the nominal pressure), carefully observe whether there is liquid leakage or other faults at the joint between the hose and the mandrel, and keep it for 1 minute, and then continue to pressurize to the test value allowed by the clamp. The result should meet the requirements of 4.5. 6 Inspection rules
6.1 Factory inspection
Each batch of clamps should be inspected and issued with a certificate of conformity before leaving the factory. 6.2 Inspection Items
The items for the factory inspection of clamps are specified in Table 8. 7
Inspection Items
Surface Quality
Operability
Clamping Performance
6.3 Batch Rules
CB/T679-2000
Required Article Number
Clamps of the same type produced in the same shift are considered a batch. Article Number of the Test Method
Sampling Quantity
4%, but not less than 2 pieces
6.4 Judgment Rules and Re-inspection Rules
a) For the items of full inspection, clamps that meet all the requirements are judged as qualified products. Clamps that do not meet the requirements for one item are judged as unqualified products;
b) For the items of sampling inspection, when all samples meet the requirements, the batch of clamps is judged as qualified products. If one sample does not meet the requirements for one item, double sampling and re-inspection are allowed. If there are still items that do not meet the requirements after re-inspection, the batch of clamps will be judged as unqualified products. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Each clamp should have a permanent mark, which should be clearly embossed on the toothless part of the outer surface of the clamp or the top surface of the cover. 7.1.2 Marking includes trademark, model, specification and size. 7.2 Packaging
7.2.1 After the finished product is cleaned, it should be packed in a carton. When packing, the direction of the clamp mark should be consistent. 7.2.2 When packing, the protruding dimension of the active end of the clamp extending out of the cover should not exceed 12mm3. The product name, trademark, standard number, model, specification, quantity, weight and manufacturer's words should be indicated on the packaging carton and packaging box. 7.2.3
The outside of the packaging carton should be tied with plastic or nylon packaging bags. 7.3 Transportation
Tumbling is allowed during transportation, but violent bumps and falls should be avoided. 7.4 Storage
The finished product should be stored in a ventilated and dry place, not in direct contact with the ground, and not mixed with acids, alkalis and other chemicals.4 Judgment rules and re-inspection rules
a) For items that are fully inspected, clamps that meet all the requirements are judged as qualified products. Clamps that do not meet the requirements in one item are judged as unqualified products;
b) For items that are sampled and inspected, if all samples meet the requirements, the batch of clamps is judged as qualified products. If one item of one sample does not meet the requirements, double sampling and re-inspection are allowed. If there are still items that do not meet the requirements after re-inspection, the batch of clamps is judged as unqualified products. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Each clamp should have a permanent mark, and the mark should be clearly embossed on the toothless part of the outer surface of the clamp or the top surface of the cover. 7.1.2 Marking includes trademark, model, specification, and size. 7.2 Packaging
7.2.1 After the finished product is cleaned, it should be packed in a carton. When packing, the clamp mark should be in the same direction. 7.2.2 When packing, the extension of the active end of the band from the cover should not exceed 12mm3 The product name, trademark, standard number, model, specification, quantity, weight and manufacturer's name should be indicated on the packaging carton and box. 7.2.3
The packaging carton should be tied with plastic or nylon packaging bags. 7.3 Transportation
It is allowed to be inverted during transportation, but violent bumps and falls should be avoided. 7.4 Storage
The finished product should be stored in a ventilated and dry place, and should not be in direct contact with the ground, and should not be mixed with acid, alkali and other chemicals.4 Judgment rules and re-inspection rules
a) For items that are fully inspected, clamps that meet all the requirements are judged as qualified products. Clamps that do not meet the requirements in one item are judged as unqualified products;
b) For items that are sampled and inspected, if all samples meet the requirements, the batch of clamps is judged as qualified products. If one item of one sample does not meet the requirements, double sampling and re-inspection are allowed. If there are still items that do not meet the requirements after re-inspection, the batch of clamps is judged as unqualified products. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Each clamp should have a permanent mark, and the mark should be clearly embossed on the toothless part of the outer surface of the clamp or the top surface of the cover. 7.1.2 Marking includes trademark, model, specification, and size. 7.2 Packaging
7.2.1 After the finished product is cleaned, it should be packed in a carton. When packing, the clamp mark should be in the same direction. 7.2.2 When packing, the extension of the active end of the band from the cover should not exceed 12mm3 The product name, trademark, standard number, model, specification, quantity, weight and manufacturer's name should be indicated on the packaging carton and box. 7.2.3
The packaging carton should be tied with plastic or nylon packaging bags. 7.3 Transportation
It is allowed to be inverted during transportation, but violent bumps and falls should be avoided. 7.4 Storage
The finished product should be stored in a ventilated and dry place, and should not be in direct contact with the ground, and should not be mixed with acid, alkali and other chemicals.
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