In case of pressure gauge what is the specific use of Gauge Saver and Snubber? When do we select Gauge Saver and Snubber? Why is Monoflange with Block and Bleed required for pressure gauges?
Answers
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07/02/2012
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A:
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Bruce Carr, Suncor Inc, matukaze1@hotmail.com
Each company will have its own set of technical standards which will include selection criteria for pressure guages. Gauge savers are normally a device that prevents overpressuring. They function in a similar fashion as relieve valve, only in reverse, with spring that will close off to the gauge if the pressure goes above the set pressure. Problem is most don't have any indication that they have overpressured and will give a false reading on the gauge.
A snubber is a device to minimize the effects of pressure spikes or pulsation. They normally have some sort of needle valve that can be adjusted. They can plug up in some services and will again give a false indication.
If you are looking for a means to separate from the process the best would be a diaphram pressure gauge isolator. It has a pressure gauge mounted on a chamber that is liquid filled. The process is attached to the other side of the diaphram . pressure is tranfered through the diaphram to the liquid to the gauge. Downside is if the gauge has to be replaced the liquid must be refilled, normally by the gauge supplier so replacement costs are higher but the gauge will last longer. A good supplier rep should be able to help with selection, the diaphram has to be compatable with the process fluid.
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