About pressure testing and purging
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I would like to ask everyone, when the pipeline is pressure tested and purged, do the one-way valves, flow meters and pressure gauges on the pipeline need to be removed?
During pipeline pressure testing and purging, the one-way valve needs to be core-pulled, the flow meter needs to remove the flow orifice plate, and the pressure gauge needs to be removed.
:) When the pipeline is pressure tested, the one-way valve, flow meter, pressure gauge, etc. on the pipeline need to be installed in place.； When the pipeline is being purged, the one-way valves, flow meters, pressure gauges, regulating valves, flow-limiting orifice plates, check valves, explosion-proof membranes, safety valves, pipeline filters, traps, flame arresters, nozzles, soft connections, etc. on the pipeline need to be removed and temporary short pipes must be connected. :loveliness:
Some need to be demolished, but of course you can also take a bypass, so it’s best to demolish them! Like the pressure gauge can be turned off ； The trap can be bypassed, and the soft connection does not need to be removed. As long as the channel is not blocked, it does not need to be removed. The pipeline filter can also be bypassed! It would be very troublesome to dismantle everything, especially the steam pipes, and it would be even more difficult at high altitudes!
No need to dismantle during pressure test. During purging, the one-way valve and flow meter need to be removed, and nipples of corresponding size and pressure level must be made. Just turn off the pressure gauge and close the valve.
Personally, I think the pressure gauge: No need to dismantle, just close the hand valve ； Check valve: If the check valve blocks the pre-designed purge line, you can of course take out the core or dismantle it. ； flow meter: It can be dismantled or not. The reason why it is not dismantled is because it is a lot of work. However, you must pay attention to the need to slowly open the hand valve during the purging process to prevent the flow meter from exceeding the range or breaking the pointer. In general, a detailed analysis of specific situations
It needs to be installed for pressure testing and needs to be removed for purging.
Does the filter need to be removed during pressure testing?
When testing pressure, the filter does not need to be removed and can be disconnected.
Purging will blow out instruments and other things, so remove them. The pressure test must be done after all the equipment is installed! !
The problem lies in the specifics. First, hydraulic test (the pressure gauge must be closed, don't break it), purge (relevant accessories must be removed), and the instrument pipe must be blown clean. If it is clogged, it will be troublesome. Air pressure test (air tightness test), all accessories must be installed. Everything is OK, we can enter the start-up stage