Issue with the outlet of the safety valve connecting to the main pipe
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This post was last edited by king2401 on 2012-8-4 at 10:25. The outlet pipeline of the safety valve generally rises above the main pipe, and then turns downward or is inserted into the main pipe at a 45° angle. The medium is hot water. Can the outlet pipeline of the safety valve be connected directly to the main pipe from its bottom? Are there any relevant specifications for this?
It is not possible to connect from the bottom of the main pipe, as there is liquid inside the main pipe, and this liquid will flow into the outlet pipe of the safety valve
Even if it is connected above the main pipe, if the safety valve operates once, the pipeline at the outlet of the safety valve will still be filled with water
The discharge pipe is generally connected vertically or at an angle from above or above the horizontal level, primarily to prevent backflow of material and to avoid the accumulation of liquid in the pipes leading out of the safety valve or the steam trap. Or it may be due to air blockage caused by fluid accumulation.
Therefore, from a safety perspective, it is advisable to install the safety valve at a position higher than the flare header.
Otherwise, a sight glass and drain valve should be installed at the outlet of the safety valve, with regular checks to remove any liquid that accumulates at the outlet.
According to API standards, the safety valve must be higher than the main pipe. Chinese regulations allow the safety valve to be located below the main pipe, but this can lead to the formation of a liquid pocket at the outlet of the safety valve, creating backpressure. If water is involved, freezing in winter must also be taken into account; therefore, the liquid at the outlet of the safety valve needs to be completely drained. .
I agree with what was said on floor 7. Additionally, the manufacturing processes should also comply with the detailed requirements in section 5.5 of GB50160. For systems that discharge pollutants directly into the atmosphere, each device requires its own separate emission pipeline; combining them is not allowed. For example, 5 reactors require 5 vent pipes, and they cannot be combined into 1 pipe.
Try not to summarize; safety valves are used to protect equipment and are not opened frequently, so there is no need to recycle them. Moreover, there are potential risks after consolidation; especially in winter, when the safety valve suddenly activates, the main pipes can easily get damaged.
It is not allowed to connect from the bottom of the main pipe; water accumulating between the main pipe and the safety valve outlet pipe can cause corrosion and freezing, and it can also affect the rapid discharge of the safety valve in subsequent instances. The outlet pipes can be combined; there’s no problem at all. The following standard specifications stipulate: 1) \"SH3011 General Principles for the Layout Design of Petrochemical Plants\", compiled by teachers Xu Xinlan and Zhang Dejiang from Sinopec Construction Company ； 2) Teacher Li Suqin from Luoyang Petrochemical on GB50160 “Code for Fire Protection in Petrochemical Enterprises” ； 2) “Textbook for National Pressure Pipeline Design Approval Personnel” by Teacher Zhang Dejiang from the Pipeline Engineering Department of Sinopec Construction Company ； 3) Teacher Song Keké from Global Company’s “National Pressure Pipeline Design and Engineering Examples” ；