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Got a question. I have seen pump vendors having a flanged (welded) plan 53 system and tubing running from the flange to and from the the seal. Is this common? Why would they do tubing rather than piping? If system is not to see the process media, why not NPT rather than flanged? I dont see...

Hello: I have an application where the vapour pressure (in gauge) is slightly higher than the pump suction pressure. This information was retrieved from the pump datasheet. However there is a postive difference between the NPSHa and NPSHr. How does this work? Shouldn't the pump be...

Anybody have detailed installation procedure for a plan 53C? Do you know where I could get one?

I received a datasheet with suction pressure the same as minimum, rated, and maximum. However the discharge pressure is different for all the min/rated/max pressure. For the same fluid and shaft speed, can the differential pressure be different?

What effect does steam out condition have on the seal? The customer has told us the pump will be subjected to the steam out condition at 24psi@267F. From the seal point of view, what questions should be asked to the customer, if any?

In general, what could be the potential causes for the process fluid contaminating the barrier fluid regardless of how high the barrier pressure differential. The seal chamber pressure is monitored and does not vary much, the barrier pressure is always maintained higher, but when the barrier...

Hi All, I have seen vent connections on API Plan 11s which have light hydrocarbons as process media. How do they safely vent this during startup? Thanks

Hi All, Could somebody explain the process of charging the accumulator for seal support system?

All: Which is better,having seal face inserts shrink fitted in seal face holders or having one solid piece of C/SiC? I have seen both from different seal vendors, just wanted to know pros and cons of each and which is better.

Hi All, Quick question..I have seen on a P&ID 'EIT'..not sure what that is..any clue what it is and its function? It was related to a piston... Thanks

Hi All, What is a convex and concave face?? Why are the seal faces lapped as convex or concave?? I dont have a particular application, but would like to know reason why. Thanks!!!

Hi All, The heat transfer rate formula is Q (BTU/h) = 500 * Cp * SG * Delta T......what is the 500 represent? What if the rate of heat transfer was Watts? How would the formula change? Thanks for your help!

I have some general questions regarding heat transfer rate. Assuming we have a shell and tube heat exchanger, with the hot fluid going through the coils and cooling water through the shell. As per my limited understanding, if we have turbulent flow of hot fluid going through the coils, this...

Hi, What does it mean to have a phonographic finish on the seal face? And why does this happen? Thanks in advance for help.