General requirements for the layout of steam pipelines

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The steam pipes of general installations should be installed overhead, rather than in ducts, and certainly not buried underground. The main steam pipeline leading from the plant system to the unit should be arranged on the upper level of the pipe gallery. 　　 　　Steam pipes shall be arranged in accordance with the following requirements: 1. Steam branch pipes shall branch off from the top of the main steam pipe, and the isolation valves on these branch pipes shall be installed on the horizontal section of the pipe close to the main pipe, in order to prevent liquid accumulation ； 　　 　　2. A drum should be installed at the end of the main steam pipe ； 　　 　　3. The spacing between demister units on horizontally installed steam main pipes is as follows: a. Within the installation, it is advisable to set the spacing at 80 m for saturated steam and 160 m for superheated steam, with these units located at the lowest point of the steam main pipe as well as at its ends ； b. Outside the facility, it should be 300 m when going uphill, and 200 m when going downhill. 　　 　　4. No branch pipes shall be taken from steam pipelines with strict steam requirements for other uses ； 　　 　　5. At the lowest point of the steam branch lines, a drain valve or steam trap should be installed depending on the specific circumstances ； 　　 　　6. No branch pipes shall be led out from the square compensator on the steam pipeline. When leading off from the straight pipes on either side of the square compensator, the branch pipes must not prevent the main pipe from deforming or shifting; likewise, they should not subject the branch pipes to excessive stress ； 　　 　　7. Before the saturated steam main enters the device, it should first pass through a steam distributor, where the condensate water generated during transportation is discharged via the trap located at the bottom of the steam distributor. Superheated steam enters the device via the main steam pipe; generally, no steam separator is used, but a drain valve is installed at the lowest point of the main steam pipe ； 　　 　　8. For steam vent pipes that discharge directly into the atmosphere, the outlet should be at a height of no less than 2 meters; the discharge point must be located outside the main operational area, and a drain valve should be installed at the lowest point of such pipes. The vent pipe should be equipped with guiding and load-bearing supports ； 　　 　　9. The steam exhaust point of the waste steam pipeline should be located in a non-primary operating area. 10. Strainers must be installed before the pressure reducing valves and control valves in the saturated steam system. Excerpt from the “National Training Manual for Design Approval Personnel of Pressure Pipelines” Excerpt from the “National Training Manual for Design Approval Personnel of Pressure Pipelines”