This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of steel and glass sintered liquid level gauges. This standard applies to liquid level gauges used to observe the internal conditions of equipment on chemical, petrochemical, pharmaceutical and other equipment with working temperatures of 0 to 180°C and pressures of -0.1 to 2.5 MPa. HG 21606-1995 Steel and glass sintered liquid level gauge HG21606-1995 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
Steel and Glass Sintered Level Gauge
HG 21606 - 95
Editor: Equipment Design Technology Center of the Ministry of Chemical Industry Changzhou Safety Accessories
Approval Department: Ministry of Chemical Industry Implementation Date: April 1996
Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
1 Subject Content and Scope of Application
This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of steel and glass sintered level gauges (hereinafter referred to as "level gauges"). This standard applies to level gauges used to observe the internal liquid level of equipment on chemical, petrochemical, pharmaceutical and other equipment with working temperature of 0~180℃ and design pressure of -0.1~2.5MPa.
GB 196
GB8163
GB/T 14976
2 Reference standards
Basic dimensions (diameter 1~600mm)
"Ordinary thread
"Ordinary thread tolerance and fit (diameter 1~355mm)""Seamless steel pipe for conveying fluids"
"Stainless steel seamless steel pipe for conveying fluids""Glass plate and glass tube for level gauge"
Type and basic parameters
The type and basic parameters of the type and basic parameters shall be in accordance with the provisions of Figure 3-1 and Table 3-1. 190
JYG-F type level gauge
Figure 3-1·
Flange installation
Observable liquid level
Total length L
Note: If other lengths are required, please consult with the manufacturer. 18
Specifications of connection flange
Table 3-1
PN(MPa)
4 Technical requirements
4.0.1 The level gauge shall be manufactured in accordance with the provisions of this standard and in accordance with the drawings and technical documents approved by the prescribed procedures.
The physical and chemical properties of the glass of the level gauge shall comply with the provisions of QB776. 4.0.2bzxz.net
4.0.3 The material of the level gauge body shall meet the following requirements: 16Mn shall comply with the provisions of GB8163;
Stainless steel shall comply with the provisions of GB/T14976, and its grade shall be determined by the user. 4.0.4 Appearance requirements for level gauges
4.0.4.1 Requirements for sintered level gauge glass are as follows: (1) The glass should be colorless and transparent, with a slight yellow or green tint allowed; (2) There should be no obvious filamentous and comb-like streaks on the glass; (3) There should be no opaque impurities on the glass, but one undissolved transparent crystal and white spot with a maximum size of less than 1mm is allowed on each piece of glass, and it should not be cracked or exist on the surface;
(4) The glass should be free of cracks and obvious scratches; (5) There should be no bubbles in the center of the glass, and the edge (within 2tnm from the bonding surface) should not have dense bubbles and dispersed bubbles exceeding the specified size. The maximum size of dense bubbles should not be less than 0.5mm, and the number of dispersed bubbles of 0.5~~1.5mm should not exceed 3 in an area of ​​40m2.
4.0.4.2 The surface of the level gauge should be smooth.
4.0.4.3 The connection surface of the level gauge body shall be smooth and free of burrs, harmful scratches and other defects that reduce strength and connection reliability. 4.0.4.4 The stainless steel level gauge shall be pickled and passivated, and the entire metal surface shall present a uniform passivation film.
4.0.5 The dimensions and accuracy of the connecting thread shall comply with the 6H grade requirements of GB196 and GB197.
4.0.6 The dimensions and requirements of the connecting flange shall comply with the provisions of HGJ44~~76 "Steel Pipe Flange".
4.0.7 Pressure Test
4.0.7.1 Hydraulic Test
Carry out the hydraulic test according to the method in 5.0.2.1. There shall be no deformation, cracks and leakage. 4.0.7.2 Design Strength Hydraulic Verification Test
Carry out the test according to the method in 5.0.2.2. There shall be no deformation, cracks and leakage. 4.0.8 Air tightness test
Test according to 5.0.3 method, there should be no deformation, cracks and leakage. 4.0.9 Thermal stability test
Test according to 5.0.4, the lens should not break, and there should be no cracks on the lens and the joint surface.
4.0.10 Other provisions
The automatic closing pressure of the needle valve is 30.2MPa. The end faces of the connecting flanges on the equipment should be on the same vertical plane, and the verticality tolerance of the upper and lower and 4.0.10.2
left and right is 1mm, and the center distance deviation is L/1000 and not more than 2mm.
The flange stud hole straddles the center line.
.5.0.1 Appearance inspection
5 Test method
The appearance inspection of the glass adopts visual inspection with a 5x magnifying glass method, which should comply with the provisions of 4.0.4.1.
5.0:2 Pressure test
5.0.2.1 Hydraulic test
Install the level gauge on a special test device. The test medium is clean water or lubricating oil. The pressure gauge accuracy should not be lower than Class 1.5. Use two pressure gauges with the same range (preferably the range is twice the test pressure) and are calibrated and within the validity period. During the test, slowly increase the pressure to 3.75MPa at a speed not higher than 0.1MPa per second and maintain the pressure for 3 minutes. It should comply with the requirements of 4.0.7.1.
5.0.2.2 Design strength hydraulic verification test
According to the method of 5.0.2.1, slowly pressurize the test piece to 2.5MPa, and release the pressure to zero; then slowly pressurize to 7.5MPa, and then release the pressure to zero, and finally slowly pressurize to 7.5MPa, and maintain the pressure for 5min. After the inspection meets the requirements of 4.0.7.2, perform the air tightness test according to 5.0.3, which shall meet the requirements of 4.0.8. 5.0.3 Air tightness test
Install the level gauge mirror on a special test device. The test medium is clean air or nitrogen. The pressure gauge is required according to 5.0.2.1. Safety protection measures should be taken during the test. During the test, slowly increase the pressure to 2.5MPa at a speed not higher than 1.0MPa per minute, maintain the pressure for 1min, and check with foaming liquid or immersion method, which shall meet the requirements of 4.0.8. 5.0.4 Thermal stability test
Place the level gauge in an electric furnace at 180±1℃, keep warm for 15 minutes, and immediately put it in an ice bath container at -20±1℃, repeat 5 times, each time interval is not less than 30 minutes, the result should meet the requirements of Article 4.0.9, and then conduct air tightness test according to the provisions of Article 5.0.3, which should meet the requirements of Article 4.0.8.
6..1 General requirements
Inspection rules
Products shall be inspected and qualified by the quality inspection department of the manufacturer according to this standard and relevant standards and technical documents before they can leave the factory.
6.0.2 Factory inspection
After passing the inspection piece by piece according to Article 4.0.4, they shall be inspected piece by piece according to 4.0.7.1 and 4.0.8, and they shall meet the requirements.
6.0.3 Type inspection
6.0.3.1 Type inspection shall be conducted in any of the following cases: (1) Trial products of each specification
(2) When there are major changes in the design, process and materials of the product; (3) When the continuous production has been completed for half a year
(4) After the intermediate suspension of production.
6.0.3.2 Batch
Mirrors of the same material manufactured in the same furnace in the same shift are considered as a batch. 6.0.3.3 Sampling method
Randomly sample 10 pieces from each batch of products.
6.0.3.4 Inspection
First, inspect each piece according to 4.0.4, 4.0.7.1 and 4.0.8. If they are qualified, then select 4 pieces from the 10 pieces and divide them into two groups, and inspect them according to 4.0.7.2 and 4.0.9 respectively. 6.0.3.5 Scrap
All products to be inspected shall be qualified. If there are unqualified products, they shall be handled according to the provisions of Table 6-1.
Inspection content
Inspection results
One unqualified
Two unqualified
Two unqualified
Re-inspection results
All qualified
One unqualified
All qualified
One unqualified
The samples that have passed the type inspection shall not be put into use. Table 6—1
This batch is completely
decided to be scrapped
This batch is completely
decided to be scrapped
7 Marking and marking examples
HG 21606--95
JYG-××-×
2 Material code: Carbon steel is not marked, stainless steel is marked Material grade
Raised face FA
Connection face form:
Liquid face FB
Nominal specification
Type code
Standard number
7.0.2 Marking example
Carbon steel L=320 raised face flange connection level gauge, marked as: HG21606--95
JYG -- 320--FA
Marking, packaging, transportation and storage
The level gauge should have the following markings:
8. 0. 1. 1
8.0. 1. 2
Model JYG):
Manufacturer name and trademark;
Specifications;
Design pressure;
Material code;
Manufacture year, month or batch number.
8.0.2 The liquid level meter should be packed in a wooden box filled with paper flowers or foam plastics. The box should contain the product certificate and product manual.
The liquid level meter should be loaded and placed lightly to prevent heavy pressure and collision, and should be stored in a dry place without acid and alkali corrosion.
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