Can a steam pipe be operated without a safety valve after pressure reduction?
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I recently received a project for the renovation of a steam pipeline, which involved installing a pressure reduction device on the existing main steam pipeline. According to the specifications, a safety valve should be installed after pressure reduction, but the user refused to do so, stating that the equipment already has its own safety valve. An application like this was also submitted. :L:L:L I would like to ask the more experienced members for advice: in a situation like this, is it okay not to install a safety valve on the pipeline? Since our quality control standards are quite strict, in a previous project the reduced-pressure gas was routed to the workshop’s steam distribution cylinder, which already had a safety valve. However, the inspectors also required us to install another one on the pipeline downstream of the pressure-reducing valve.
Hello, based on the owner’s application letter, I think it is inappropriate: first of all, the number of safety valves on the equipment is unknown; if there are two, I believe it may not be necessary to install any additional safety valves. According to GB50160-2018, in the same pressure system, if there is already a safety valve at the source of pressure, then safety valves are not required on the other equipment. However, it is necessary to have two safety valves in operation in order to ensure safety. Secondly, if, as the owner states, no safety valves will be installed, then corresponding interlocked pressure relief devices are necessary; these can automatically activate to relieve pressure when the pressure in the temperature and pressure reduction system becomes too high, thereby ensuring safety.
If the equipment’s safety valve takes into account the scenario of a steam pressure relief valve losing control, no problem is considered to exist.
Like ls, it can be omitted, but you need to verify whether the leakage rate is met
I would like to ask the original poster: in the case where steam at 0.5 MPa is reduced in pressure to 0.3 MPa using a pressure regulator, does there be any change in temperature before and after the pressure regulator?
Cancellation is not recommended; safety is of utmost importance, and safety valves serve as a safeguard to ensure production safety. These are just my personal opinions for reference only.
1.0.5 MPA = 149 degrees, 0.3 MPA = 131 degrees; basically, there isn’t much difference in temperature. It depends on whether the design temperature of the pipeline at 0.3 MPA can withstand such conditions. 2. Since the pressure drop isn’t significant, it should be fine if one really doesn’t want to install it
Check whether the discharge capacity of the original safety valve meets the requirements; if it does, no action is necessary
The safety valves in the pipeline network are different from those on the user’s equipment. Once he closes the steam valve, the pressure relief system loses control, and the pipeline network experiences overpressure.