Some standard content:
Industry Standard of the People's Republic of China
HG/T 21550-93
Unit:
Approved:
Implementation period:
Ministry of Chemical Industry Engineering Construction Standard Editing Center
W Ministry of Chemical Industry Document
Chemical Construction Development (1994) No. 810
and other four items
Issued "Mechanical Mixing Equipment
Chemical Industry Standards"
, Planning Units, Municipalities, Construction Committee (Construction Department), Chemical Industry Department (Bureau, but
, Autonomous Regions
All relevant design
units:
Developed by the Ministry of Equipment Design Book Technology Center Station
Related Information
& Mechanical Mixing Equipment
》《Anti-frost liquid level gauge》《Equipment quality ear》and 《Lighted gauge》, the numbers of the four standards are as follows: tt
, ... 2150-93
HG/T21574-94
HG/T21575--04
Subject content and scope of application
Torque standard
Structural type, basic technical parameters and installation dimensions Technical requirements:
++++++++++.++++++.+++
Dimensions of flanges for external connection and sealing
Liquid limit test
Air tightness test
Compared with standard The standard specifies the type, size, technical requirements and related logic of the anti-frost liquid level gauge. This standard is applicable to the anti-frost liquid level gauge with nominal pressure PN2.5MPa and PN4.0M1u and the temperature (medium plate temperature) of 160~-0℃. 3077
2 Reference standards
《Steel Pressure Vessels》
Asbestos Rubber Sheet》
Technical Conditions for High-quality Carbon Steel》
《Stainless Steel Welding Rods》
《Low Alloy Structural Steel》
《Tolerances and Fits》
Technical Notes on Limit Deviations of Dimensions》
《Stainless Steel Seamless Steel Pipe》
(Technical Works of Structural Steel》
《Technical Conditions for Low Alloy Steel Plates for Overfill Resistant Containers》
《Stainless Steel Cold Working Steel》
《Stainless Steel Hot Rolled Steel》 Plates》
Carbon steel welding rods》
Low alloy steel welding rods》
Plates for melters and low alloy steel plates》Industrial glass plates, plates and materials》"Conveyor body welded steel plates"
《Paint, packaging, tower welding》"Welding process assessment for steel pressure vessels》"Micro steel and low alloy steel parts for low humidity vessels-Stainless steel forgings for melters》
Pressure vessel inspection》
《Consumer fuel plate and glass tube》
Structural type, basic parameters and installation dimensions The structural types of this standard anti-frost liquid are divided into type A and type B 3. 0. 1
In the .A type, it is divided into AI, 41 and AA according to the body material and applicable temperature range. The structure is a rectangular cross-section body, suitable for low boiling point liquids, and surface indication in the case where bubbles are easy to occur in the liquid column in the meter. The structure, installation dimensions and quality of the 4 plastic anti-frost gauge are shown in Figure 3.0.1-1 and Table 3.0.1. The structure is a rectangular cross-section body, suitable for medium temperature of 40~0℃, and surface indication in the case where bubbles are basically not generated in the liquid column in the meter. The structure, installation dimensions and quality of the B type are shown in Figure 3.0.1-2 and Table 3.0.1. W Figure
W Nominal liquid level gauge
300×15
Total length
Flange connection size
115[ 85
14010024
Table 3.0.1
Approximate mass of oxygen-proof drop gauge ()
PN4,0:
The flange connected to the needle valve method of the liquid level gauge should be a concave flange, and its connection dimensions should be the flange dimensions of nominal diameter DN25, nominal pressure PN4.GMPa and 6.3MPa in HGJ51 respectively. . Anti-frost liquid resistance gauge operating temperature, type, material, anti-frost fin height and fin 3.0.2
Color - See Table 3.0.2.
Table 3.0.2
Use intensity
-40- -
Anti-frost gauge
Gauge type
-160~70
Main body material
rI&Nigi
CrI&NigTi
Fin height
H(mn）
Fin color code
Note: the fin height listed in the table is smaller. When the fin height is required (such as the thickness of the insulation layer of the liquid level gauge exceeds the fin height listed in the table), it should be manufactured according to the fin height provided by the user. 3.0.3
For materials of anti-frost gauge components, see Table 3.0.3. Parts name
Needle valve
Pressure screw
Connecting pipe
Push M6×35
[Wood Street
10 Seal
Boning plate
Frost-breaking piece
Anti-barrel liquid level gauge type
16Mnl)
Cr18Nig
(K'r18Ni g
0r18Ni9
OCr&NST
A42---70
OCrL8NigTi
ci1329.18www.bzxz.net
Naishan stone guide
Chang Xiang Jiao Ji (can be replaced according to the requirements of the medium) corrosion
1GMnDR
35CrMoA
ocri8Ni9
oC18N ig
TN (cold technology)
35CrMoA
35CMoAG6170
35CrM:A
Technical requirements
Flange size and sealing surface type for external connection 4.1
Connection flange standard: HGJ51.
Anti-frost liquid level gauge with nominal pressure PN2.5MPa, its standard connection size is PN4.0, DN25 Raised face flange.
Anti-frost level gauge with nominal driving force PN4.0MPa
α, its flange connection size is PN6.3, DN25 flange.
The materials used to manufacture the anti-frost level gauge must have a quality certificate. In addition to complying with the following standards, the materials used in 4.2.1
shall also comply with the requirements of this standard and drawings. 20R.16MDR and OCr18i9 copper plates shall comply with 4. 2. 1. 1.
GB6654GB3531 and GB4237. 20, 16Mn and Cr18Ni9Ti steels shall conform to the provisions of GB81634. 2. 1. 2
and GB2270. 16MnD and Cr18Ni9 forgings shall conform to the provisions of JB4727 and JB4728 for sub-grade forgings. 4.2.1.4 The materials shall conform to the provisions of G13699, CB1591, GB3077, GI31220 and GI34226. Welding rods shall conform to the provisions of GB5117, G5118 and GBP83. 4. 2. 1. 5
Glass plates shall comply with the specifications of T320 in QB776 standard. 4.2.1.6
Gaskets and thermal buffer materials shall comply with the specifications of GB539 and GB3985 respectively.
4.2.2 The 20R steel plate used to manufacture the A1 type anti-frost liquid level gauge pressure cover shall be subjected to a low-temperature impact test of -20C as specified in GB1501, and the impact energy value shall conform to the requirements of Table 4.2.2. When the use temperature is below or lower than -20C, the low-temperature alloy steel plates and main steel pipes used to manufacture A1 and B4 anti-frost liquid level gauges shall be subjected to ultrasonic flaw detection inspection piece by piece according to the regulations of JB34730. The qualified grade of the steel plate is Grade 1, and the qualified grade of the steel pipe is Grade 2.
When the operating temperature is equal to or lower than
-20°C, the low alloy steel material used to manufacture A and B types
4.2.
frost level gauges shall be subjected to low temperature Charpy (V-notch) impact test according to the provisions of (GB150 Appendix C "Low Temperature Pressure Tolerances"
). The test temperature and pressure shall comply with the provisions of Table 4.2,2.
Austenitic stainless steel materials used to manufacture AI type anti-frost wave surface gauges may be exempted from the following: 4.2. $
Impact test.
Requirements for low temperature impact test of materials
Use status
20R (plate)
(paste sample)
(forging)
Quenched and tempered or tempered tangentially, longitudinally
+tempered
(strip type)
Austenitic stainless steel
Amine 84708
Sampling direction
Test temperature
Low temperature
The impact energy of the three selected samples shall be equal to the value of the impact energy of the three samples under the test temperature of the method. The average value of the impact energy of the three samples shall not be less than the value specified in the table. The impact energy of each sample may be less than the value of the impact energy, but shall not be less than 70% of the average value. 4.3 4.3.1 When the use temperature is lower than or equal to -20℃, the low-gold steel material used to make the anti-frost roller surface shall be made of The low temperature impact toughness shall be re-tested according to the provisions of Appendix C "Low Temperature Pressure Vessels" of GB150. If the low temperature Charpy (V-shaped) impact test data is missing in the steel quality certificate, the low temperature punching test shall be repeated according to the specified number of sheets or roots. The selection of welding materials shall comply with the requirements of the drawings. Before welding, the welding process qualification test shall be carried out according to the provisions of JB4708. Among them, the welds of low temperature steel with a temperature equal to or lower than -20°C and standard stainless steel with a temperature lower than 100°C shall be used. The low temperature impact test of the weld metal chips shall be carried out. The requirements of temperature, humidity and impact energy of the impact test shall comply with the provisions of Table 4.2.2.
Butt welds shall be subjected to 100% radiographic inspection according to the provisions of JB4730. The qualified level is "level".
Remaining welds shall be subjected to magnetic particle or penetrant inspection according to the provisions of JB4730. The requirements of "level II" are not allowed.
4.4 Dimensional tolerances
The tolerances of machined cut surfaces and non-machined surfaces shall be as small as possible. 4.1
The deviations are respectively in accordance with the requirements of grade 14 and grade 15 accuracy specified in GB1804. The method of expressing
is: the hole is 11, the input is, and the length is ±IT. 4.4.2 After the surface gauge is assembled, its assembly dimension tolerance is as follows: 4.4: 2.1
4.4. 2.2
4.4. 2.3
The allowable deviation of the nominal pressure 7. is ±1.5mm, and the vertical line spacing between the two needle valve flange centers is not greater than the verticality tolerance of the flange surface shall not be greater than 0.5% of the flange outer diameter. 4.5 Hydraulic test
For the anti-frost liquid level gauge with nominal pressure PN2.5MP4, the hydraulic test force is 3.7MPat
For the anti-frost liquid level gauge with nominal pressure PN4.0MFa, the hydraulic test force is 6.MPa.
4.6 Air tightness test
When the ordering unit requires, the anti-frost liquid should also be tested for air tightness. The test should be carried out after the pressure test is qualified. For the anti-frost liquid level gauge with PN2.5MPa, the air tightness test force is 2.63MPa; for the anti-frost liquid level gauge with PN4.0MPa, the air tightness test force is 4.2MTa. The test requirements shall be in accordance with the relevant regulations in GB150.
Packaging and marking
4.7.1 The coating, packaging and transportation of anti-frost liquid gauges shall refer to the provisions of J132536. A product inspection certificate shall be attached upon delivery. Each set of anti-frost liquid gauges shall have the following contents stamped or marked on the outer edge of the blue plate at both ends: 4.7:2
(1) Standard number (HG/T21550);
(2) Nominal pressure;
(3) Nominal length;
(4) Type code;
(5) Manufacturer's name or trademark.
Www.bzsoso..com
Specified marking symbols
Specified markings for anti-frost liquid level gauges are as follows:
Anti-frost box liquid level gauge×
×××-
HG/T_21590-93
一Anti-frost fin height mm
Nominal length Lmm
Nominal force equivalent/NVMFa
一Anti-frost wave gauge type (AI)
A, AI or
Brown marking examples
Example 1: Nominal F force PN4.0Pa, nominal length.=1260mm
Fin height
=-150mm.
Plastic antifrost liquid level gauge
Panpei liquid level gauge
-1260-150
FG/T2155
If the insulation thickness of the anti-frost liquid level gauge exceeds the fin height, it is allowed to add fins
Example 2: Nominal pressure FN4.0nPu. Nominal length fin height
F--1260mm
needs to be increased to
220mn, black material
type antifrost liquid level
anti-box liquid level Meter
HG/T2155
-1260--220
, Gang 3: Nominal pressure PN4.0MPa, nominal length H=50mw R wing rib frost liquid level
Anti-frost liquid level meter
1260-50
=1260mm
Fin height
HC/T21550—3
Ordering requirements
When ordering, the material type, pressure level, length and fin height of the ordered liquid level meter should be indicated according to the avoidance mark. In addition, the degree of use and whether the ordered liquid level meter is required to be tested for air tightness should also be indicated.1 When the use temperature is lower than or equal to -20℃, the low-gold steel material used to manufacture the frost-proof roller surface shall be re-tested by the manufacturer according to the provisions of Appendix C "Low-temperature Pressure Vessels" of GB150. If the low-temperature Charpy (V-shaped) impact test data is missing in the steel quality certificate, the low-temperature punching test shall be repeated according to the specified number of sheets or roots. The selection of welding materials shall comply with the requirements of the drawings. Before welding, the welding process qualification test shall be carried out according to the provisions of JB4708. Among them, the welds of low-gold steel with a use temperature equal to or lower than -20℃ and standard stainless steel with a use temperature lower than 100℃ shall be subjected to low-temperature impact tests of weld gold chips. The requirements for the temperature, humidity and impact energy of the punching test shall comply with the provisions of Table 4.2.2.
Butt welds shall be subjected to 100% radiographic inspection according to the provisions of JB4730. The qualified level is "level II".
The remaining welds shall be subjected to magnetic particle or penetrant testing according to the provisions of JB4730. The requirements of "level II" are not allowed.
4.4 Dimensional tolerances
The tolerances of machined cut surfaces and non-machined surfaces shall be as small as possible. 4. 4. 1
The deviations shall be in accordance with the requirements of level 14 and level 15 accuracy specified in GB1804 respectively. The method of expressing
is: the hole is 11, the input is, and the length is ±IT. 4.4.2 After the assembly of the anti-frost level gauge, its assembly dimension tolerance is as follows: 4.4: 2.1
4.4.2.2
4.4.2.3
The allowable deviation of the nominal depth 7. is ±1.5mm, and the vertical line spacing between the two needle valve flange centers is not greater than the verticality tolerance of the flange surface shall not be greater than 0.5% of the flange outer diameter. 4.5 Hydraulic test
For the anti-frost level gauge with nominal pressure PN2.5MP4, the hydraulic test pressure is 3.7MPat
For the anti-frost level gauge with nominal pressure PN4.0MFa, the hydraulic test pressure is 6.MPa.
4.6 Air tightness test
When the ordering unit requires, the anti-frost liquid should also be tested for air tightness, and the air tightness test should be carried out after the pressure test is qualified. For PN2.5MPa anti-frost level gauge, the airtightness test force is 2.63MPa; for PN4.0MPa anti-frost level gauge, the airtightness test force is 4.2MTa. The test requirements shall comply with the relevant provisions in GB150.
Packaging and marking
4.7.1 The paint, packaging and transportation of anti-frost level gauges shall refer to the provisions of J132536. A product inspection certificate shall be attached upon delivery. Each set of anti-frost level gauge shall be stamped or marked with the following contents on the outer edge of the blue plate at both ends:
(1) Standard number (HG/T21550);
(2) Nominal pressure;
(3) Nominal length;
(4) Type code:
(5) Manufacturer's name or trademark.
Www.bzsoso..com
Specified marking symbols
Specified markings for anti-frost liquid level gauges are as follows:
Anti-frost box liquid level gauge×
×××-
HG/T_21590-93
-Anti-frost fin height mm
Nominal length Lmm
Nominal force equivalent/NVMFa
-Anti-frost wave gauge type (AI)
A, AI or
Brown marking examples
Example 1: Nominal F force PN4.0Pa, nominal length. = 1260mm
Fin height
=-150mm.
Plastic antifrost liquid level gauge
Panpei liquid level gauge
-1260-150
FG/T2155
If the insulation layer thickness of the anti-frost liquid level gauge exceeds the fin height, it is allowed to add fins
Example 2: Nominal pressure FN4.0nPu. Nominal length fin height
F--1260mm
needs to be increased to
220mn, black material
type antifrost liquid level
anti-box liquid level Meter
HG/T2155
-1260--220
, Gang 3: Nominal pressure PN4.0MPa, nominal length H=50mw R wing rib frost liquid level
Anti-frost liquid level meter
1260-50
=1260mm
Fin height
HC/T21550—3
Ordering requirements
When ordering, the material type, pressure level, length and fin height of the ordered liquid level meter should be indicated according to the avoidance mark. In addition, the degree of use and whether the ordered liquid level meter is required to be tested for air tightness should also be indicated.1 When the use temperature is lower than or equal to -20℃, the low-gold steel material used to manufacture the frost-proof roller surface shall be re-tested by the manufacturer according to the provisions of Appendix C "Low-temperature Pressure Vessels" of GB150. If the low-temperature Charpy (V-shaped) impact test data is missing in the steel quality certificate, the low-temperature punching test shall be repeated according to the specified number of sheets or roots. The selection of welding materials shall comply with the requirements of the drawings. Before welding, the welding process qualification test shall be carried out according to the provisions of JB4708. Among them, the welds of low-gold steel with a use temperature equal to or lower than -20℃ and standard stainless steel with a use temperature lower than 100℃ shall be subjected to low-temperature impact tests of weld gold chips. The requirements for the temperature, humidity and impact energy of the punching test shall comply with the provisions of Table 4.2.2.
Butt welds shall be subjected to 100% radiographic inspection according to the provisions of JB4730. The qualified level is "level Ⅱ".
The remaining welds shall be subjected to magnetic particle or penetrant testing according to the provisions of JB4730. The requirements of "level Ⅱ" are not allowed.
4.4 Dimensional tolerances
The tolerances of machined cut surfaces and non-machined surfaces shall be as small as possible. 4. 4. 1
The deviations shall be in accordance with the requirements of level 14 and level 15 respectively specified in GB1804. The method of expressing
is: the hole is 11, the input is, and the length is ±IT. 4.4.2 After the assembly of the anti-frost level gauge, its assembly dimension tolerance is as follows: 4.4: 2.1
4.4.2.2
4.4.2.3
The allowable deviation of the nominal depth 7. is ±1.5mm, and the vertical line spacing between the two needle valve flange centers is not greater than the verticality tolerance of the flange surface shall not be greater than 0.5% of the flange outer diameter. 4.5 Hydraulic test
For the anti-frost level gauge with nominal pressure PN2.5MP4, the hydraulic test pressure is 3.7MPat
For the anti-frost level gauge with nominal pressure PN4.0MFa, the hydraulic test pressure is 6.MPa.
4.6 Air tightness test
When the ordering unit requires, the anti-frost liquid should also be tested for air tightness, and the air tightness test should be carried out after the pressure test is qualified. For PN2.5MPa anti-frost level gauge, the airtightness test force is 2.63MPa; for PN4.0MPa anti-frost level gauge, the airtightness test force is 4.2MTa. The test requirements shall comply with the relevant regulations in GB150.
Packaging and marking
4.7.1 The paint, packaging and transportation of anti-frost level gauges shall refer to the provisions of J132536. A product inspection certificate shall be attached upon delivery. Each set of anti-frost level gauge shall be stamped or marked with the following contents on the outer edge of the blue plate at both ends:
(1) Standard number (HG/T21550);
(2) Nominal pressure;
(3) Nominal length;
(4) Type code:
(5) Manufacturer's name or trademark.
Www.bzsoso..com
Specified marking symbols
Specified markings for anti-frost liquid level gauges are as follows:
Anti-frost box liquid level gauge×
×××-
HG/T_21590-93
-Anti-frost fin height mm
Nominal length Lmm
Nominal force equivalent/NVMFa
-Anti-frost wave gauge type (AI)
A, AI or
Brown marking examples
Example 1: Nominal F force PN4.0Pa, nominal length. = 1260mm
Fin height
=-150mm.
Plastic antifrost liquid level gauge
Panpei liquid level gauge
-1260-150
FG/T2155
If the insulation layer thickness of the anti-frost liquid level gauge exceeds the fin height, it is allowed to add fins
Example 2: Nominal pressure FN4.0nPu. Nominal length fin height
F--1260mm
needs to be increased to
220mn, black material
type antifrost liquid level
anti-box liquid level Meter
HG/T2155
-1260--220
, Gang 3: Nominal pressure PN4.0MPa, nominal length H=50mw R wing rib frost liquid level
Anti-frost liquid level meter
1260-50
=1260mm
Fin height
HC/T21550—3
Ordering requirements
When ordering, the material type, pressure level, length and fin height of the ordered liquid level meter should be indicated according to the avoidance mark. In addition, the degree of use and whether the ordered liquid level meter is required to be tested for air tightness should also be indicated.0MPa, nominal length H=50mw R wing rib frost level
Anti-frost level gauge
1260-50
=1260mm
Fin height
HC/T21550—3
Ordering requirements
When ordering, the material type, pressure level, length and fin height of the ordered level gauge should be indicated according to the avoidance mark. In addition, the degree of use of the ordered level gauge and whether it is required to do an airtightness test should also be indicated.0MPa, nominal length H=50mw R wing rib frost level
Anti-frost level gauge
1260-50
=1260mm
Fin height
HC/T21550—3
Ordering requirements
When ordering, the material type, pressure level, length and fin height of the ordered level gauge should be indicated according to the avoidance mark. In addition, the degree of use of the ordered level gauge and whether it is required to do an airtightness test should also be indicated.
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