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Obturator, I am working as an Application Engineer (Quotation) in Emerson. Hope you are too from Emerson. Ok noted, from now onwards I will post PRV related queries in safety relief forum.

Hi All, Can anyone explain me whats the purpose of adding vapouriser as an accessory in pilot valve usually in cryo application? Also I need to know whats inside a vapouriser and its working principle? Whats its role in gas and liquid application? Example: Anderson greenwood 249 & 449 pilot...

Hi Obturator and others, I need to know why valve sizing is been done without considering water hammer scenario? If there is a safety valve in the discharge line with a shutoff valve at the end, when I close the shutoff valve suddenly, which leads all the inertia of the flowing liquid to act...

ok thankyou

Hi All, Please guide on below query, have a look on the attached pic. where to do you get the MAX tolerance limit for this, is it from unspecified general tolerance ? Unspecified tolerance for the attached is ± 0.015 . What will be the max limit? Thanks in...

Hi Obturator & Others, Please guide on below query, have a look on the attached pic. where to do you get the MAX tolerance limit for this, is it from unspecified general tolerance ? Unspecified tolerance for the attached is ± 0.015 . What will be the max limit? Thanks in...

Hi Obturator & Others, I am keen to know about the recents trends on safety relief valves which are spoken all over the world. Can you share your views on global market for SRV, ongoing issues ...etc.. Also please explain How far the recent trade war b/w U.S and china & Saudi Aramco drone...

Ok Obturator, I have started to extract data relevent to LNG, from my previous projects. As you have said I will contact any EPC companies which we have worked with to get additional data. Anyway thanks for guiding. I will share it with you personally once this thing gets finished. Thankyou...

Obturator, The link which you shared has a loyout with flow control and actuators mainly. Can you plese help me find out something similar to this with Safety releif valves? It would be very useful for me if i get details regarding SRV in this same layout or similar. Thanks in advance.

Hi all, I am working on creating a PPT to explain customer where PRV can be used in LNG plant. The objective is to focus on every process inside the plant. For example Liquefication, I need a schematic diagram of liquefication process explaining where the PRV can be installed in it. (inlet or...

Hi Bill, Crosby valves can work beyond 850 cP. Viscosity has a relation with Capacity Correction Factor. (Kv) When a liquid relief valve is required to flow a viscous fluid there may be the occasion to adjust the required orifice area for a laminar flow regime. If REYNOLDS Number is less than...

How can blowdown be less for liquid service? Catalog actually states max 20% for all fluids Answering above qs: The trim of the valve we selected was liquid,but the fluid passing through it is gas in nature (This specific requirement needs both liquid and gas i.e two cases, where the governing...

Hi avalveman, 15% is for liquid application.For gas its 20%.

Hi avalveman, Thanks for reply. Sounds to be a good idea, but series 800 (Spring operated) is no longer in production. Its already obsolete.

Hi Gguliye & avalveman, Thanks for responding. 80 Series from Emerson has shorter blow down but the drawback here is that the customer requires metal to metal seat, which rules out all the 80 Series and pilot operated valves. Requirement: Size: 3/4 x 1 inch. (Other PRV models cannot be...

Per ASME Section VIII, system pressure (Operating pressure) Should be always less than blowdown pressure range. This makes sure that the valve will reseat again after discharge before the operating pressure is reached. I have a customer whose operating pressure is falling within my valves...

Can anyone answer the Blowdown %(Reseat Pressure) of 400 Series AG Pilot valve?