This standard specifies the type, size, technical requirements and selection regulations of reflective glass plate liquid level gauges with a nominal pressure of 4.0 MPa. HG 21590-1995 Reflective glass plate liquid level gauge (PN4.0) HG21590-1995 Standard download decompression password: www.bzxz.net

Reflection glass plate liquid level gauge
(PN4.0）
HG 21590—95
Subject content and scope of application
This standard specifies the type, size, technical requirements and selection regulations of reflection glass plate liquid level gauge with a nominal pressure of 4.0MPa1. 0. 1
. The nominal pressure of this standard is 4. 0MPs, and the operating temperature is 0~250℃; when the operating temperature exceeds 200C, the maximum allowable (impact-free) operating pressure shall be determined in Table 1.0.3 of HG21588-95#5 standard.
The corrosion margin in this standard shall be as specified in Table 1.0.2. 1.0.2
Table1.0.2
Material code
Stainless copper1
Corrosion allowance
Reference standard
HG21588-95 Standard series and technical requirements for glass plate fatigue gauge\t
Structural type, basic parameters and dimensions
The structural types of this standard are two types of liquid level gauges: "bottom with valve" and "bottom with screw plug", which are respectively "ordinary type" and "insulation type". The parameters and dimensions are shown in Table 3.0.1 and Figure 3.0.1. 3.0.2 The glass plate is in accordance with QB776-80 "Glass plate and glass tube for liquid level gauge" standard, and the specification number is R280.
Basic parameters and dimensions of reflective glass plate liquid level gauge (PIN4.0) Table 3. 0. 1
Hot steam pipe
(kg）
Liquid level gaugeLoose lengthTransparent sizeTransparent total lengthBottom valve with bottom screw plug
Interface spacing:
NumberL(mm)LX14(mm)
260×14
260×14
260×14
260×14
260×14
Ordinary typeInsulation typeOrdinary typeInsulation type
19.719. 617.7
28. 326. 2
Carbon steel (Class I), stainless steel (Class I) liquid level gauges have the same weight, 109
Uniform distribution in the span
-253 (open)
-Middle 18
Uniform distribution in the road
Insulation type
Ordinary type
A (B center) needle valve (part number) with valve type
Port material-120
4 (BC) needle valve (part number 1 or part number 9)
.6×1.3|| tt||Figure 3.0.1 (continued)
Structural diagram of reflection type glass plate liquid level gauge (PN4.0) 2
Sealing welding
Copper welding (melting electrode automatic argon arc welding)
Heating hot steam pipe interface
Copper welding (melting electrode automatic argon arc welding)
Heating steam general interface
Figure 3.0.1 (continued) Structural diagram of primary reflection type glass plate liquid level gauge (IN4.0) t
Technical requirements
Should comply with HG 21588-95 {Glass Plate Liquid Level Gauge Standard Series and Technical Requirements》.
Selection Regulations
Flange size and type for external connection
The nominal diameter of the flange is DN20 or 3/4\. 5.1.1
5.1.2The flange types are A, B and C, and their connection dimensions are as follows: Type A: Raised face flange (RF), according to HGJ50-91, PN6.3 Type B: Raised face flange (M), according to HGJ 51-91, PN6.3; Type C: Raised face flange (RF), according to ANSIB16.5W.N.300#. 5.2
This standard uses flexible graphite composite gaskets. Users can choose to replace materials with a preload pressure less than or equal to 48.5MPa and a gasket coefficient m less than or equal to 2 according to operating conditions and medium characteristics, but it must be indicated in the assembly drawing of the equipment. 5.3 Marking and specifications
Marking regulations and examples shall comply with the relevant regulations in HG21588-95. 5.3.2 Liquid level gauges of various specifications in this standard shall be selected according to Table 5.3.2 and indicated in the details column of the equipment assembly drawing.
Capsule 5.3.2 Specifications and markings for reflective glass-filled liquid level gauges (PN4.0)
Liquid level gauge A (B, C) R4.0-I -550V(P)
R4.0-1 850V(P)
Liquid level gauge A (B, C)
R4.0-- 1 -1150V(P)
R4.0-I -1450V(P)
Liquid level gauge A (B, C)
R4.0-- 1 -1750V(P)
Liquid level gauge A (BC)
R4.0-I -550V(P)
A(B,C)
Hidden surface meter
R4. 0- 1 -850V(P)
Axillary surface meter
R4. 0-I -1150V(P)bzxZ.net
Wind surface meterA(B,C)
Hidden surface meter
A(B,C)
R4. 0— 1 -1450V(P)
Liquid level meter
R4. 0- -1750V(P)
Axillary surface meter
R4.0- I - 550V(P)
R4. 0- IW -- 850V(P)
Quilt surface gauge A(B,C)
R4, 0- 1 W-1150V(P)
Liquid level gauge
R4. 0-1W-1450V(P)
Cross surface gauge A(B,C）
Liquid level gauge A(B,C)
R4, 0- 1 W- 1750V(P)
Liquid level gauge
R4. 0- IW -- 550V(P)
R4. -- I W--850V(P)
Axillary surface gauge
A(B,C)
Liquid level gauge A(B,C)
R4, 0- Iw-1150V(P)
Quilt surface meter A(B,C)
R4. 0- I W-1450V(P)
Surface meter
R4. 0- I W-1750V(P)
Standard drawing (i.e. construction drawing) drawing number
HG 21590—95-1
HG 21590-95-2
HG 21590-95—3
HG 21590- 95—4
HG 21590- 955
HG 21590-95-6
HG 21590-95-7
HG 21590-95--8
HG 21590- 95 -- 9
HG 21590-95-10
HG 21590—95—11
HG 21590—95—12
HG 21590— 95-13
HG 21590— 95—14
HG 21590—95—15
HG 21590-95-16
HG 21590—95-17
HG 21590-95-18
HG 21590-95—19
HG 21590—95—20
Additional Notes
The unit proposing this standard, the editor-in-chief
and the main drafters
Ministry of Equipment Investment and Technology Center
Global Chemical Engineering Corporation
Main drafters
Wang Xiaohua
Xue Tijun
Kong Xianglin
Bang Pichang
Xu Zhiyuan
Zou Zhiguang
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