Hello,
are PSV seats ( metal seats) for conventional valves made from forging or casting or simply machining from cylinder?
Are different MNF following different rules to produce it?
If it is made from castings, can we have some dirt stuck on poroous parts of disc that may later cause leakage...
Hello All,
which standard defines what is the pressure boundary part for a safety relief valve?
Does the nozzle of the valve belong to the pressure boundary?
regards
Hi All,
is there any reasons why 316 SS spring is not possible to select for PSV in nace application while 316 SS nozzle or disc are possible to select?
regards,
Hello All,
I am reading butterfly training and it tells me that EOL PED Limitations applied to all resilient seated valves what kind of limitations of PED do we have for EOL service on butterfly valves?
regards,
Hi All,
my question is not exactly about PSV, but valves in general
I have a ball valve that is anti-static by design and anti-static means that we have electrical continuity between stem ball and body. So it is clear that the explosion can not happen from the internals of the valve, for that to...
Dear All,
i have the following question. i am completely new to regulators. so i am reading the datasheet for 67C regulator and found the following. it has the check valve assembly as being smart bleed option and is activated when the upstream pressure is lost and all air in the output enters to...
Hi All,
i have a request for AG 800 valve and it is 2 phase flow. the customer doesnt know exactly the gas density so it prevents me from sizing. however, the valve is like to like replacement, so i have an orifice size already calculated. should i be so strict on gas density? will it affect...
Hi,
I am reading a book regarding the check valves and it says to prevent water hammer:
If the valve does not close instantaneously but within the time of a
pressure-wave round trip of 2L/a, where L is the length of the pipeline, the
first returning pressure wave cannot cancel the last...
Dear All,
I am starting to study the gate valves: I totally dont understand at all the following sentence:
the wedge
is carried on valve opening initially on the seat until the fluid load has
become small enough for the body ribs to carry the wedge. This method
of guiding the wedge may require...
Dear group Members,
I would need ur valuable advise on can we use A193 B7 and A 193 2H as NACE bolts or I have to use the ones which end with M? (A193 B7M , or A 193 2HM)
Dear Team members,
why balanced valves becomes unstable when the constant back pressure is greater than 50 % of set pressure? does it bend the bellow?
regards,
Dear All,
The pressure relief valves come with the different orifices and each orifice has the fixed flange rating based on API. However, in my case, the customer would like to deviate from API flange ratings
The customer requires J orifice with 300 # inlet and 300 # outlet. However, the...
Dear Team,
I have received an enquiry in which the customer is looking for a relief valve for natural gas service. I have two options to choose for the spring which is chromium or Inconel x 725. Which one can handle the natural gas better?
regards,
Dear Team,
While reading the PED requirements, I have noticed the following thing:
in the case of multiple relief valves, the 1 pressure relief device can be set to MAP, while others can be set +5 percent above it. However, at the same time, PED doesn't allow us to go beyond the 10 % from MAWP...
Dear All,
I have been searching for the compatibility of chrome spring with the methane gas however, I didn't find anything. Can anyone advise how is the chrome spring compatibility with the methane gas?
If it is unknown, I believe, I will have to proceed with the bellow valve.
regards,
Dear PSV team,
the customer requires a spring valve from me with LCC body 150 # inlet outlet, flange and SS trim
parameters are as following:
set pressure 16 barg
Operating/relieving temperature: 107.6 F
-50.8/392 F is the design min and max
the program says the following: the inlet...
Dear Team,
I have been doing a small sizing task for the actuator
I have been given the following:
the control valve (EZ) is unbalanced
the port diameter: 1"
Travel: 0.75"
Classs II shutoff
PTFE Packing.
The available supply: 0-18 psig
Stem diameter: 3/8 "
I would like to proceed with...
Dear Team,
I have received a valve with the spring number let's say A( arbitrary number) where the CDTP range for the spring is shown as between 19 barg and 22 barg. however, the set pressure of the valve is 12 barg. can we use A spring for this application?
regards,
