HG/T 20549.5-1998 Technical Specification for Piping Layout Design of Chemical Plants HG/T20549.5-1998 Standard download decompression password: www.bzxz.net

Chemical plant pipeline layout design
Technical regulations
HG/T20549.5-1998
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1.1 Piping principles
1.1.1 Pipeline layout design should be carried out in accordance with the design principles described in Article 1.1.2 of the "Chemical Plant Pipeline Layout Design Engineering Regulations" (HG/T20549.2). 1.1.2 The pipe on the tower should be located on the side close to the pipe gallery, and the manhole should be arranged on the side close to maintenance. 1.1.3 When the outlet pipe of the tower is connected to the pump, the tower elevation should be determined according to the net positive suction pressure head of the pump. 1.2 Piping requirements
1.2.1 Orientation of pipe openings
1 The orientation of the pipe openings of the tower shall meet the requirements of the working principle and structure of the tower internals. When designing, the relative orientation of the overall structure of the equipment internals and the orientation of the pipe openings shall be determined at the same time. 2 For the design requirements of the orientation of the pipe openings, see Chapter 9 "Orientation Design of Equipment Pipe Openings" of these Regulations. 3 For towers with tower plates, the manholes should be arranged on the tower diameter parallel to the overflow weir of the tower plate. If conditions do not permit, they may not be parallel, but the net distance between the manhole and the overflow weir in the horizontal direction should be greater than 50mm. The layout of the manholes shall comply with the schematic diagram of the orientation of the manholes of tower equipment in Figure 1.2.1-1. 4 The orientation of the manhole davits shall be arranged uniformly with the setting of the ladder; in the event of an accident, the direction in which the manhole cover is closed smoothly shall be consistent with the direction in which people evacuate, so that it is not blocked. 5 The interface of the liquid level gauge can be directly connected to the liquid level gauge through the root valve, or it can be connected to the connecting pipe of the liquid level gauge through the root valve. The interface of the liquid level gauge shall not be arranged opposite to the feed port unless the feed port is protected by an internal baffle. The external float type liquid level control pipe directly connected to the tower should be equipped with a baffle. The liquid level gauge, liquid level control float, alarm and other devices are often located inside the tower platform or at the end of the local platform for easy maintenance. 6 The pressure gauge interface should be arranged in the gas phase area of ​​the tower so that the pressure gauge reading is not affected by the liquid level pressure head. 7 The arrangement of the sampling port and the temperature measuring port, the gas phase sampling port and the temperature measuring port should avoid the gas phase area of ​​the tower plate downcomer: the liquid phase sampling port and the temperature measuring port should be located in the tower plate liquid holding layer in the downcomer area; the liquid phase sampling tube that is easy to crystallize should be sloped toward the tower plate. See Figure 1.2.1--2 for the requirements for the orientation arrangement of the sampling port and the temperature measuring port on the tower equipment. 183
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Minimum 50mm
Possible position range of manhole
Tower plate surface and
Changeable position of manhole
Minimum 50mm and equipment
Professional business decision
Minimum 50mm
Normal position of manhole
Center line of manhole!
Single overflow
Center line of manhole!
Double overflow
Figure 1.2.1-1 Schematic diagram of manhole position of tower equipment Standards are available on the Internet
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Changeable position of manhole
Recommended position of manhole
Downcomer
Positive belt position
Liquid phase sampling point
Changeable range
Gas phase connection sampling point
Located behind the downcomer
Liquid phase connection sampling point
Generally in the downcomer
Threaded connection
(Gas phase)
Threaded connection
(Liquid phase)
Insertable length of thermocouple
(tangent connection can be made when necessary)| |tt||Gas phase sampling connection or temperature
Changeable range of sampling point
Top of tower plate
150Gas phase sampling connection point or
Center line of thermocouple sleeve
150Variation range
Top of overflow weir
Thermocouple TI, TW, IR, etc.
(Liquid phase)
Schematic diagram of typical instrument connection point location
Figure 1.2.1-2 Standard layout of sampling and temperature measuring ports on tower equipment Jiejie.com
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8The positioning of the tower top davit should be able to reach above the lifting point outside the platform and the position of all manholes in the platform when rotating.
1.2.2 Tower Pipeline Arrangement
1 The main pipe arranged along the tower should be as close to the tower as possible. The pipe insulation layer passing through the platform shall not collide with the inner ring components of the platform, see Figure 1.2.2 Schematic diagram of the main pipe arranged along the tower. At the same time, it should not collide with the beams of other platforms, engineering pipe
Inner ring of platform
Figure 1.2.2 Schematic diagram of the main pipe arranged along the tower
2 Discharge pipe of safety valve
The safety valve discharged to the atmosphere should be installed on the first platform under the manhole at the top of the tower to facilitate the support of the outlet pipe and the use of the tower top sling to hoist the safety valve. The position of the safety valve discharge pipe shall comply with the requirements of Article 5.1.3 of the "Chemical Plant Equipment Layout Design Engineering Regulations" (HG20546.2). 3 The piping of the tower shall meet the special requirements of PID, such as the relative elevation of the tower and the reboiler, the valve position, the slope, the liquid seal, the bagless shape, etc.
4 When piping, the installation of accessories such as platforms and ladders should be planned in a unified manner and should be complete. The layout of the platform should meet the following requirements:
1) It is convenient for the operation and maintenance of valves, instruments, blind plates between flanges and special parts; 2) The distance between the center of the manhole and the platform is generally in the range of 750-1250mm, and the optimal height is 900mm;
3) The orientation of the ladder should make people face the tower wall. Each section shall not exceed 10m, and the sections shall be arranged alternately left and right; The connection method between the lower end of the ladder and the platform should be able to compensate for the axial thermal expansion of the tower body: 4) When a joint platform is used between multiple towers, the needs of thermal expansion and contraction of the tower body should be met. The two tower platforms should be hinged at one end and slidably overlapped at the other end.
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1 The position of the fixed support and guide support on the tower should be determined as early as possible with the stress analysis engineer so as to propose load conditions to the equipment professional. The positions of the load-bearing brackets of two or more pipes laid along the tower should be staggered when the pipe diameter is large. When determining the position of the load-bearing bracket, the load acting on the pipe interface should be minimized. For an example of the position of the load-bearing bracket, see Figure 1.2.3, the schematic diagram of the position layout of the load-bearing brackets for pipes laid along the tower. 2. When laying vertical pipes from the top of the tower downward along the tower wall, if the vertical load is large, in order to reduce the local stress of the tower body at the rooting point of the top load-bearing bracket, a spring hanger can be set in the middle of the vertical pipe to share the load of the vertical pipe. 187
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Load-bearing support
Guide support
Load-bearing support
Load-bearing support
Guide support
Load-bearing support
A load-bearing support
Figure 1.2.3 Schematic diagram of the position layout of the load-bearing support for pipes laid along the towerStandard pre-carrying network
oso.com1.3.1 Examples of piping for general towers
1.3 Examples of piping for towers
1 See Figure 1.3.1-1 for the vertical piping of the tower||tt ||0000~0002
Inner wall of the head
900(7501250)
Level gauge
Discharge portbzxz.net
Bearing frame
Safety width
Bearing frame
Guide frame
Bearing frame
Pipe flange surface
Safety valve discharge pipe to flare
Figure 1.3.1-1 Tower vertical piping
Standard visual pick net.Wm.t2oso.conGemei standard industry information science free download2A—A plane diagram see Figure 1.3.1-2.
Figure 1.3.1-2A-A plane diagram
3B-B plane diagram see Figure 1.3.1-3.
Figure 1.3.1-3B-B Plan
If a platform is required, use a side ladder
The discharge pipe of the safety valve
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When necessary, the thermometer and pressure
gauge interface
Liquid level gauge
Figure 1.3.1-4C-C Plan
1.3.2 Piping example of a reducer tower
1 The vertical piping of a reducer tower is shown in Figure 1.3.2-1. Standard Technology Exchange Network me.bzrogo.cm Various British Standard Industry Information Science Free Download HXA
Typical level gauge connecting main pipe
Intermediate platform
Can use inclined ladder. When the radius difference in the container is less than or equal to 300mm, a straight ladder can be used, but the upper platform may need to be widened at this time
Intermediate platform
Reboiler
Figure 1.3.21
Standard installation network
Elevation
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Load-bearing frame
Another pipeline direction is determined by the difference in diameter between the upper and lower towers
Guide frame
Guide frame
2D-D plane diagram is shown in Figure 1.3.2-2.
The height of the vertical ladder on the tower platform should not exceed 3m. Answer: The tower platform should be vented.
Figure 1.3.2—2D-D plan
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