This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of steel and glass sintered sight glasses. This standard applies to sight glasses 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 1.6 MPa. HG 21605-1995 Steel and glass sintered sight glasses HG21605-1995 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
HG 21605--21606 - 95
Steel and glass sintered sight glass
Steel and glass sintered liquid level gauge
1995-12-28 Issued
1996 - 04 - 01
Ministry of Chemical Industry of the People's Republic of China
96--90912 0H
96--09 H
16-2912 0
96 --1291 H
S6--0201 DH
9669512
16169012
56-89912 0H
96--9991 H
96-9992 H
16-991
9689 H
96-26912
S6181
S60012
Table of Contents
《Steel and Glass Sintered Sight Glass》(HG21605-95)1
Subject Content and Scope of Application·
Cited Standards
Type and Basic Parameters
Technical Requirements
Test Methods·
Inspection Rules
Marking and Marking Examples,
Marking, Packaging, Transportation and Storage·
《Steel and Glass Sintered Level Gauge》(HG21606-95)1
Subject Content and Scope of Application
Cited Standards·
Type and Basic Parameters
Technical Requirements
Test Methods
Inspection Rules
Marking and Marking Examples Example
Marking, packaging, transportation and storage·
Preparation instructions
(1)
(5)
Industry Standard of the People's Republic of China
Steel and glass sintered sight glasses
HG21605-95
Editing unit: Changzhou Safety Accessories Factory, Equipment Design Technology Center, Ministry of Chemical Industry
Approving department: Ministry of Chemical Industry Implementation date: April 1, 1996
Engineering Construction Standard Editing Center, Ministry of Chemical Industry
Beijing
-1 Topic content and scope of application
This standard specifies the types and basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of steel and glass sintered sight glasses (hereinafter referred to as "sight glasses"). This standard applies to sight glasses used to observe the internal conditions of chemical, petrochemical, pharmaceutical and other equipment with an operating temperature of 0~180℃ and a design pressure of 0.1~1.6MPa. 2
GB 898
GB 3452.1
GB4237
GB 6170
JB4726
JB4728
HGI501-86--0
2Referenced standards
《Standard spring washers》
《Standard studs (L, = 1.25d)》
《Dimensions and tolerances of "O" type rubber sealing rings for hydraulic and pneumatic use》
《Hot-rolled stainless steel plates》
《Type I hexagonal nuts - Grade A and Grade B》
《Carbon steel and low alloy steel forgings for pressure vessels》《Stainless steel forgings for pressure vessels》
:《Technical conditions for the manufacture and acceptance of tempered sight glass》
3 Types and basic parameters
The types and basic parameters of sight glasses shall be as specified in Figure 3-1 and Tables 3-1 and 3-2. D
Figure 31JSE type sight glassbZxz.net
Sight glass body
“” type sealing ring
Material or specification
20, stainless steel/glass
Nitrile rubber, EPDM rubber, silicone rubber
Table 3-1
Standard No.
GB6170
Center circle diameter of stud hole
(both are Xi)
Table 3-2
“O\” type medical specifications
Inner diameter × section diameter
32.5X2.65
92.5X3.55
132×5.30
155×5.30
4 Technical requirements
4.0.1 The sight glass should It shall be manufactured in accordance with the provisions of this standard and the drawings and technical documents approved by the prescribed procedures.
4.0.2 The physical and chemical properties of the sight glass lens shall comply with the provisions of HGJ501-86-~0. 4.0.3 The material of the sight glass seat shall meet the following requirements: 20 steel forgings shall comply with the provisions of JB4726,
20R steel plates shall comply with the provisions of GB6654:
Stainless steel shall comply with the provisions of GB4237 (steel plates) and JB4728 (forgings), and its brand shall be determined by the user.
4.0.4 Appearance requirements for sight glasses
4.0.4.1 The requirements for the sintered sight glass lens are as follows: (1) The lens shall be colorless and transparent, with a slight yellowish or light green tint allowed: 2) There shall be no obvious silky and comb-like stripes on the lens: 3) There shall be no irregularities on the lens Transparent impurities, but transparent crystals and white spots with a maximum size of less than 1mm that have not been dissolved are allowed, and the number shall not exceed 2, and shall not be cracked or exist on the surface.
(4) There shall be no cracks or obvious scratches on the lens. (5) There shall be no bubbles in the middle of the lens, and the edge (within 2mm from the bonding surface) shall not have dense bubbles and dispersed bubbles exceeding the specified size. The maximum size of dense bubbles shall not exceed 0.5mm, and the number of dispersed bubbles of 0.5~～1.5mm shall not exceed 3 on an area of ​​40mm2.
4.0.4.2 The surface of the sight glass seat shall be smooth and free of burrs, harmful scratches and other defects that reduce strength and connection reliability. 4.0.4.3 Stainless steel sight glasses shall be pickled and passivated, and the entire metal surface shall present a uniform passivation film.
4.0 .5 Pressure resistance test
4.0.5.1 Hydraulic test
Perform the hydraulic test according to the method of 5.0.2.1. There should be no deformation, cracks and leakage. 4.0.5.2 Design strength hydraulic verification test
Perform the test according to the method of 5.0.2.2. There should be no deformation, cracks and leakage. 4.0.6 Air tightness test
Perform the test according to the method of 5.0.3. There should be no deformation, cracks and leakage. Thermal stability test
Perform the test according to 5.0.4. The lens should not break, and there should be no cracks on the lens and the joint surface.
4.0.8*0” type sealing ring is made of nitrile rubber, EPDM rubber, silicone rubber, etc., which is selected by the user according to the requirements of the medium, working temperature, etc. Its size and technical requirements are in accordance with the provisions of GB3452.1.
4.0.9 The connecting studs of the sight glass shall comply with the requirements of Grade 4.8 of GB898, and the nuts shall comply with the requirements of Grade 6 of GB6170.
The mounting surface of the sight glass shall be smooth and flat, and shall not have any defects that affect the seal. 5 Test methods
5.0.1 Appearance inspection
The appearance inspection of the lens shall be carried out by visual inspection with a 5x magnifying glass, and shall comply with the provisions of 4.0.4.1.
5.0.2 Pressure resistance test
5.0.2.1 Hydraulic test
The sight glass shall be installed on a special test device. The test medium shall be clean water or lubricating oil. The pressure gauge shall have an accuracy of not less than Grade 1.5. Two pressure gauges with the same range (preferably 2 times the test pressure) and calibrated and within the validity period shall be used. During the test, the pressure shall be slowly increased to 1.5 times the nominal pressure at a speed not higher than 0.1MPa per second, and the pressure shall be maintained for 3 minutes, which shall comply with the provisions of 4.0.5.1.
5.0.2.2 Design strength hydraulic verification test
According to the method of 5.0.2.1, slowly pressurize the test piece to the nominal pressure, and release the pressure to zero: then slowly pressurize to 2 times the nominal pressure, and then release the pressure to zero, and finally slowly pressurize to 3 times the nominal pressure, and maintain the pressure for 5 minutes; after the inspection meets the requirements of 4.0.5.2, perform the air tightness test according to Article 5.0.3, and it should meet the requirements of Article 4.0.6. 5.0.3 Air tightness test
Install the sight glass on a special test device, the test medium is clean air or nitrogen, the pressure gauge is required according to the requirements of 5.0.2.1, and safety protection measures should be taken during the test. During the test, slowly increase to the nominal pressure at a speed not higher than 1.0 MPa per minute, and maintain the pressure for 1 minute: check with foaming liquid or immersion method, and it should meet the requirements of Article 4.0.6. 5.0.4 Thermal stability test
Place the sight glass in an electric furnace at 180±1℃, keep warm for 15 minutes, and immediately put it in an ice bath at -20±1℃. Repeat 5 times, with each time interval not less than 30 minutes. The result should meet the requirements of Article 4.0.7. Then, conduct an airtightness test according to the requirements of Article 5.0.3. The test should meet the requirements of Article 4.0.6.
6.0.1 General requirements
Inspection rules
Products shall be inspected and qualified by the quality inspection department of the manufacturer in accordance with 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 in accordance with Article 4.0.4, they shall be inspected piece by piece in accordance with Articles 4.0.5.1 and 4.0.6 and shall pass.
6.0.3 Type inspection
6.0.3.1 Type inspection shall be carried out in any of the following circumstances: (1) Trial products of chain specifications:
(2) When there are major changes in the design, process and materials of the product: (3) When continuous production has been completed for half a year:
(4) After an intermediate stoppage of production.
6.0.3.2 Batch
Sight glasses of the same material manufactured in the same furnace during the same shift are considered 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, 4.0.5.1, and 4.0.6, and they should be qualified; then select 4 pieces from the 10 pieces and divide them into two groups, and inspect them according to 4.0.5.2 and 4.0.7 respectively. 6.0.3.5 Scrap
All inspected products should be qualified. If there are unqualified products, they shall be handled according to the provisions of Table 6-1.
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