HG/T 21572-1995 Stirring drive device--Mechanical seal circulation protection system HG/T21572-1995 standard download decompression password: www.bzxz.net

Stirring drive mechanical seal circulation protection system HG21572--95
1. Subject content and scope of application
This standard specifies the working mode and function, process, selection principle and technical conditions of the stirring drive mechanical seal circulation protection system (hereinafter referred to as the circulation protection system). This standard is applicable to the stirring vessel with a design pressure of 0.1~1.6MPa and a design temperature of 20~300℃, and is used for the mechanical seal of the stirring shaft.
JB/T4709
HG21566
HG21567
HG21571
Reference standards
《Welding process specification for steel pressure vessels》《Stirring drive device-single-pivot frame》《Stirring drive device-double-pivot frame》《Stirring drive device-mechanical seal》
3 Working mode and function
The working mode of the circulation protection system is forced circulation or thermal convection circulation. 3.0.1
3.0.2 The circulation protection system has the functions of lubrication, temperature regulation, pressure regulation, etc. 145bzxZ.net
Composition of the circulation protection system
The circulation protection system consists of a storage tank, a booster tank, a circulation pump, pipe fittings, valves and control instruments. 146
Circulation protection system process
5.1 Forced circulation system
5.1.1 Storage tank circulation system (process 1) See Figure 5.1.1. 5.1.2 Balance tank circulation system (process 2) See Figure 5.1.2. 5.1.3 Pressurized tank circulation system (process 3) See Figure 5.1.35.1.4 Open circulation system (process 4) See Figure 5.1.4. 5.2 Thermal convection circulation system
5.2.1 Storage tank thermal siphon process (process 5) See Figure 5.2.1. 5.2.2 Balance tank thermal siphon process ( Process 6) See Figure 5.2.2. 5.2.3 Pressurized tank thermal siphon process (process 7) See Figure 5.2.3. 5.2.4 Pressurized tank thermal siphon process (process 8) See Figure 5.2.4. 147
Process 1
Process 2
Process 3
Process 4
Process 5
Process 6
Figure 5.2..2
Process 7
Process 8
Sealed chamber pipe arrangement
Circulation protection system sealed chamber pipe arrangement See Figure 6--1. R
Figure 6-1 Isolation fluid pipe arrangement
System selection principles
7.0.1 When the sealed medium temperature T≥80℃, a forced circulation system is generally selected. If a thermal convection circulation system is selected, a cooling device is required.
When the sealed medium temperature is T80℃, use the thermal convection circulation system. 7.0.2 See Table 7.0.2 for the recommended use process. Recommended use
Pressure level
General medium
Flammable, explosive, toxic
General medium
Flammable, dry, cystic
Medium temperature
>80℃
>80℃
≤80℃
>80℃
>80℃
Recommended mechanical seal
2001/2002
2004/2005
2003/2004/2005
2006/2007/2008
2003/2004 /2005
2006/2007/2008
2003/2004/2005
Recommended process
Process 5
Process 1, 4
Process 7, 8
Process 3, 8
Process 6, 7
Process 5, 6
Process 2, 3
Process 1, 2
Process 7, 8
Process 3.8
8 Principles for selecting isolation fluid
8.0.1 Temperature requirements: sealing chamber inlet temperature T, ≤55℃, temperature rise At≤25℃, outlet temperature T, =T+At≤80℃.
8.0.2 When the sealed medium is general medium such as oil and water, it is recommended to use glycerol as isolation fluid. 8.0.3 When the sealed medium is other than the medium specified in 8.0.2, the selection of the isolation fluid should be discussed with the seal manufacturer.
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