This standard specifies the types of the standard series of transmissive, reflective and mirror glass plate liquid level gauges, the maximum allowable operating pressure at each temperature, technical requirements and marking methods. HG 21588-1995 Glass plate liquid level gauge standard series and technical requirements HG21588-1995 standard download decompression password: www.bzxz.net

Glass plate liquid level gauge standard series and
technical requirements
HG21588--95
Main content and scope of application
This standard specifies the standard types, maximum allowable operating pressures at various temperatures, technical requirements and marking methods of the transmissive, reflective and sight glass plate liquid level gauge series1.0.1
. This standard is applicable to glass plate liquid level gauges used for liquid level indication with a nominal pressure of 0.0~~0.1MPa, normal pressure vessels1.0.2
and 0.6, 2.5, 4.0, 6.3MPa pressure vessels in the chemical industry, and an operating temperature of 0~250C. The series standards are shown in Table 1.0.2. Man
Using temperature
Nominal pressure
Name and model
(MPa）
0~-250
0-~250
0~~250
Configuration type
Ordinary type
Insulation type
Ordinary type
Insulation type
Neck type
Embedded connection
Plastic connection Q
Plastic connection QH
Table 1. 0. 2
Main materials of liquid level gauge
1(plated steel 16Mn)
1(forged steel 1C18Ni9T)
1(forged steel 16Mn)
1(design pin 1Cr18Ni911)
1(forged pot 16Mn)
1(fake steel ICr18Ni9Ti)
1(forged steel 16Mn)
1（Forged steel 1Cr18Ni9Ti）
「（Forged steel 16Mn）
（Plated steel 1Cr1&Ni9Ti）
（Forged steel）
（Forged steel）
1Cri&NigTi
I(16MnR)
1（0Cr18Ni9）
More（16MnR (with lining)
(Q235-A)
E(0Cr18Ni9)
to (Q235-A with lining)
F(16MnR)
1(0Cr18Ni9)
：1(16MnR with lining)
Note:()I.=904 refers to the maximum observation length of the sight glass liquid level gauge (S type). Glass liquid level gauge is standard
Nominal length (distance between the center line of the upper and lower valves) (nin)
-304550|-850L1150L=14501750
Brown Huai No.
HG 21559.1-95
②When the operating temperature exceeds 200℃, the pressure should be reduced as required. The maximum allowable (no impact) operating pressure is determined according to Table 1.0.3: ③A-
- indicates the operating range.
HG 21583. 2—95
HG21590-95
HG 21591.1-95
HG 21591. 2-95
When the operating temperature exceeds 200℃, the light-transmitting 1. 0. 3
glass plate liquid level gauge with a nominal pressure of 6.3MPa and the reflective glass plate liquid level gauge with a nominal pressure of 4.0MPa should be used at reduced pressure. The relationship between the operating temperature and the maximum allowable (no impact) operating pressure is shown in Table 1. 0.3.
Broken plate liquid level gauge operating temperature and allowable height (without impact) Table 1.6.3
Using pressure relationship table
Quick using temperature
Transparent glass plate liquid level gauge maximum allowable
(without impact) using pressure, MPa
Reflective glass plate liquid level gauge maximum allowable
(without impact) restoring pressure, MPa
230240
GB 700
GB1220
GB2520
GB3077
GB3274
GB3323
GB3380
GB4237
GB 6654
GB1527
GB2040
GB5231
GB 901
GB1804
Cited standards
《Steel Pressure Instruments》
《Technical Conditions for High-quality Carbon Structural Steel》
《Carbon Structural Steel Strip》
《Electroplated Sawn Steel Plate》
《Technical Conditions for Alloy Structural Steel》
《Carbon Structural Steel and Low-alloy Structural Steel Hot-rolled Thick Plate and Strip》
《Radiography and Quality Classification of Copper Fusion Welded Butt Joints》
《Aluminum and Aluminum Alloy Plates》bZxz.net
《Stainless Steel Hot-rolled Plate》
《Pressure Carbon steel and low alloy steel thick plates for chips》
Drawn copper tube net
Pure copper plate》
"Processed copper
Same chemical composition and product shape"
"Standard spring washer"
"Basic dimensions of ordinary threads"
"Selection and marking of ordinary thread tolerance zones"
"Steel balls"
Cross recessed countersunk head screws"
&Elastic retaining rings for holes"
"Equal length studs - Grade B\
"Limit deviations of dimensions without tolerances"
GB3985
GB 4457.3
GB6170
GB 7306
JB/T4709
JB4730
JB2536
JB1692
HGJ223
HGJ 50
《Stone Ladder Rubber Sheet》
Mechanical Drawing Font》
“Type 1 Hexagon Nut--A Grade B and Grade B" "Pipe threads sealed with threads"
"Welding regulations for steel pressure vessels"
"Non-camera inspection of pressure vessels"
"Painting, packaging and transportation of pressure vessels"
"Umbrella-shaped handwheels"
"Equal-length studs"
"Product labels"
"Glass plates and glass tubes for liquid level gauges"
"Appendix A\Technical conditions for medium and small forgings for pressure vessels" in the "Regulations on the selection of materials for copper chemical containers"""Technical regulations for welding and brazing of copper and copper alloys""Sinusoidal neck butt-welded steel pipe flanges"
"Concave and convex neck butt-welded steel pipe flanges""Flexible graphite composite gaskets"
ANSI B16.5 (Pipe flanges and flange fittings) 3. 1. 1
Glass plate liquid level gauge series standard
Models, codes and marks of glass plate liquid level gauge series standard 3.1
Transparent type:
-Reflective type;
-Mirror type:
Flange type code
Raised face flange (RF), according to IGI50 standard, convex flange ((M), according to HGI51 standard)
Raised face flange (RF), connected to ANSIB16.5 standard Material code
Carbon steel;
Stainless steel;
-Carbon steel strip, only used for S type,
Conclusion Type code
Ordinary type—
Insulation type
Neck type
-Not marked!
?Only for T type and R type;
Only for s type.
Embedded connection type
Drain outlet code
With valve;
With screw plug.
Marking regulations
HG21589.1, HG 21589.2, HG21590 standard marking regulations as follows 1
-00-×X××0
Liquid level gauge
口口×X
Drain outlet code V, P
-Nominal length value
"Ordinary type is not marked
Structural type code!
Insulation type code W
--Material flower number
Nominal pressure value| |tt||-Model T, R
Flange type code AB, C
2HG21591.1.HG21591.2Standard marking regulations are as follows:Liquid level gauge
Structural type code J, Q
-Material code I, I, II
Nominal pressure value
-Model s
Marking example
Example 1: Translucent type, nominal pressure 2.5MPa, carbon steel material, insulation type, drain outlet with valve, raised face cover connection (according to HG】50 standard), nominal length L-1450mm liquid level gauge, its mark is:
Liquid level gauge AT2.5—IW--1450V
Example 2: Reflection type, nominal pressure 4.0MPa, stainless steel material, ordinary type, drain outlet with screw plug, raised face flange connection (according to ANSIB16.5 standard), nominal length L-850mm liquid level gauge, its mark is,
Liquid level gauge CR4.0—I-850P
Example 3: Sight glass type, normal pressure, stainless steel material, embedded connection type liquid level gauge, its mark is:
Liquid level gauge S- IQ
Example 4: A liquid level gauge with a hip type, nominal pressure of 0.6MPa, lining and neck is marked as:
Liquid level gauge S0. 6IJ
Technical requirements
4.0.1 All materials used to manufacture liquid level gauges must have a quality certificate issued by Taige. In addition to complying with the material standards currently stipulated by the state, the materials used must also comply with the requirements of this standard and design documents.
4.0.2 For the glass plate material in this standard, when tempered silicon glass is used, the heat-resistant rapid temperature difference of the glass plate should be 240℃, and the glass plate should comply with QB776-80 "Standard for Glass Plates and Protective Glass Tubes for Reduced-surface Gauges".
When the main body material of the liquid level gauge is made of carbon fiber (I), stainless steel (I), and carbon steel strip (I), the gasket material of the light-type (T type) and reflective type (R type) liquid level gauge should be multiplying graphite composite gasket, and the gasket material of the sight glass type (S. plastic) liquid level gauge should be asbestos rubber sheet.
The allowable deviation of the size between the upper and lower flanges of the T type and R type level gauges is as follows; 4.a.4
The sealing surfaces of the two flanges should be in the same vertical plane, and the allowable deviation of their verticality should be less than 1mam.
The allowable deviation of the spacing of the vertical lines passing through the centers of the two flange sealing surfaces should be less than 1.5mm.
The allowable deviation of the spacing between the centers of the two flanges should be ±1.5mm.3
The automatic closing pressure of the steel ball of the needle valve of the T type and R type liquid level gauge is 0.3MPa.4.0. 5
For the protected T-type and R-type liquid level gauges, when steam heating is adopted, the steam pressure shall be less than or equal to 0.6MPa.
Hydraulic pressure test
After the T-type and R-type liquid level gauges are manufactured, they shall be subjected to a hydraulic pressure test at 1.5 times the nominal pressure of the liquid level gauge, and the pressure test requirements shall comply with the provisions of GB 150. The 2S-type liquid level gauge shall be assembled on the equipment and subjected to a hydraulic pressure test at the same time as the equipment, and the test pressure and test requirements shall be consistent with those of the equipment. 4. 0. 8 Air tightness test
If the design has other requirements, an air tightness test shall also be carried out after the water pressure test is passed. The test pressure of the T-type and R-type liquid level gauges is 1.05 times the nominal pressure of the liquid level gauge, and the test requirements shall comply with the provisions of GB150. The test pressure and test requirements of S-type liquid level gauge are the same as those of the equipment.
Weld flaw detection
Magnetic particle flaw detection shall be carried out in accordance with Article 11 of JB4730-94: T-type and R-type, Grade I qualified;
S-type, qualified if it meets the requirements of 11.13:1;
Color flaw detection shall be carried out in accordance with Article 12 of JB4730-94. T-type and R-type, Grade I qualified;
+S-type, qualified if it meets the requirements of 12.7.1. The oil, packaging and transportation of liquid level gauges shall comply with the specifications in JB2536 standard. 10
Products should be accompanied by the above-mentioned quality certificates before leaving the factory. Additional Notes
The unit proposing this standard, the unit compiling it
and the main drafter
Equipment Design Technology Center Station, Ministry of Chemical Industry
Proposing unit:
China Huanqiu Chemical Engineering Corporation
Main drafter
Vice: Wang Xiaohua
Approval: Shi Huixu
Approval: Xue Tijun
Xu Zhiyuan
Zou Zhiguang
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