Can anyone give some clarification on the below statement with respect to plug valve design,
In a discussion, it came up as "A pressure balanced plug valve has to be a lubricated metal seated plug valve"
which logically means,
"Soft seated plug valve cannot be pressure balanced?"
Appreciate...
Hello,
I am having confusion with respect to temperatures which I need to select for a pipe stress analysis. Do I have to consider the Minimum Design Temperature (zero DegC) for stress analysis or is it enough to take only installation temperature (21degC).
My temperatures conditions are
T1...
Hi,
I have 2 doubts with regards to valve seats
1. What is the meaning of this statement "The ball and metal seat ring assembly shall be part matched by lapping". It would be great if you could guide me to some technical article or paper.
2. What is Primary Metal Secondary Soft (PMSS)...
Is it advisable to provide pipe sleepers on sloping lines? I have a 12" header rolling 9 degree vertically and a sleeper is shown in the drawing. Wondering if it is a good engineering practice.
Any suggestions?
Hi,
I have observed this in all the site visits I have done. Top most thing in any train of piping is a PSV. It takes the highest elevation above the pipe rack.
What is the logic? I do not want to get into hydraulics of it, but a basic logical reason to quench my curiosity.
Thanks
Theory part:
What are the conditions under which a surge analysis of a piping becomes necessary? What is the basis of surge analysis? What are we checking and trying to achieve by doing surge analysis of a piping section or a piping system?
Coming to the practical case:
There is an existing...
I need to leak test a 10" - 100 meter long pipe at 20 Barg with Nitrogen
What is the volume of nitrogen required for this leak test.
Any calculation basis will be much helpful
Thanks
shaff
Hello,
What is the ASTM specification for washer to be used with A193/A194 bolting? Will ASTM A36 do the job?
It will be used in GRE piping application. Service - Fire Water at moderate pressure and atmospheric temperature (85DegC design temp)
Thanks
Hello,
Can we use AISI 420+stellite instead of AISI 410+stellite? This is for valve trim materials (Disc, Stem, Wedge, seat rings etc)
Preliminary search on this says that they are same material with different strengths.
420 has higher carbon content. Corrosion resistance is same for both...
Hello All,
Good Day..!
I need to order an Incoloy flange. I have a very old piping class given to me and that says it is ASTM A425 (which is in the form of rod and bars).
There is another grade, ASTM A564 (which is forging).
While comparing I found chemical composition and mechanical...
Hi,
We need to procure gate valves for our project and I am doing Technical Assessment of Valve materials
Datasheet given by design engineer asks for AISI 410 STELLITE COATED material whereas vendor is offering F6+STELLITE.
Is this change acceptable? Valve will be working in moderate...
Hi all,
I am in the process of evaluating bids for pipes to be used in a sour service. NACE MR 0175 is applicable for these pipes.
Majority of vendors are stating that since they are supplying pipes with sulpur content less thant 0.01%, HIC test need not be done. Is this an acceptable...
Hey guys,
Heat exchager is using seawater for cooling purpose. The which connect to the HE nozzles are of TITANIUM material. Then it continues as CS with serr glass flake lining inside.
My question is why the TITANIUM spools in between, why not glass lined CS pipes all along?
Also, I will be...
Hello,
In the data sheet for a strainer the specification for perforation is given as " For gas service: 7.2 holes/cm2, 3mm plate thickness."
What exaclty this means? I presume that there is some lack of data in here...
I need to give hole dia and pitch to the strainer manufacturer.
How to...
10" Sch 120 pipe is hydrotested at 165.45Barg pressure. The relief valve was set of 1.1 times this pressure (181.99Barg). However during test the pressure went upto 188 Barg. due to improper settings.
Will this raise in pressure (188Barg) have any impact on properties of pipe material? Has any...
To construct additional Fuel supply - Hard stands for Aircrafts in a newly built airport, we need to take tapping from existing underground pipeline (20” API 5LB Sch40 pipe, internally coated). Tapping is done by a Weldolet 20”X6” on the pipe. Client mechanical engineer says that they will run...
Hi,
I have to specify a U-Bolt for a A106B pipe. My understanding is that U-Bolt materials are of same material as the Stud Bolt material specified for the flange (in the relevant pipe class). The difference here is that it is bent to U shape. Am I correct?
I went throgh a lot of product...
Hi,
Pipe Class and the data sheet for a ball valve calls for A105 Body material. Project department has procured A350 Lf2 material Ball valve and asking engineering to give some justification to show to client that it is superior and hence acceptable for the servie (oil line at amb. temperature)...
