Is it mandatory to have a shut-off valve in front of the pressure gauge?
Thread Content
The isolation valve in front of the pressure gauge can be used when the gauge needs to be serviced. However, the issue is that the owner stated that production is intermittent, and it’s sufficient to stop production during maintenance; the question is whether the isolation valve in front of the pressure gauge is mandatory Which standard requires it? Why do experts keep focusing on this issue?
Is the cost of shutting down the equipment for maintenance once cheaper than that of using the shut-off valve on this pressure gauge? If not, it’s still necessary to use it.
Isn’t it cheaper without a pressure gauge? That thing isn’t very useful anyway
You can check the installation specifications; they contain comprehensive requirements
Perhaps the owner meant that, since production is intermittent, the maintenance time for their own equipment and instruments is scheduled during this period as well; therefore they may feel there is no need to install this. Because their facility operates on a batch basis, they can focus on doing anything during periods when the entire plant is shut down. I think that’s what the owner means.
If the pressure gauge fails during production, how should it be repaired? Does the plant need to be shut down for repairs? One of the functions of valves is to facilitate repairs, and the other is to allow for regular drainage
The chemical engineering installation manual requires root valves. It is very practical to install a front valve on the pressure gauge, and the cost is not high. Replacing the pressure gauge or performing other tasks without closing the gauge’s front valve can prevent contact with the medium. A pressure gauge is itself a consumable item.
1. The self-control installation manual requires a root valve； 2. The design responsibilities between the automation engineering and piping engineering fields are divided at the hand valve as a boundary ； 3. The design division of responsibilities between the automation engineering and piping engineering fields states that, prior to instrument installation, it is advisable to treat pipelines and equipment as closed systems, with the root valve serving as the boundary of this closed system ； 4. Pressure gauges should be inspected every six months; or, after being classified, they also need to be calibrated regularly. Root valves are a necessary requirement for online replacement ； 5. The pressure gauge is damaged and needs to be replaced; the root valve is a necessary condition for online replacement ； 6. As a safety measure, the root valve allows for temporary shutdown in case the pressure gauge is damaged