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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...

Thanks for the response and my apologies as the datasheets were seen at customer site and I dont have a copy of it. I just remembered see this and having a discussion later on stating the pump will cavitate and my senior stating their is a margin in the NPSH, hence it will not cavitate. He...

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?

Sorry, not received, but I have a pump datasheet which had this information on it. Why would there be a little difference with the discharge pressure if we dont increase or decrease the suction pressure?

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?

This is for a buddy of mine, I will try to get more details..but it is a plan 53A..could you explain this in more detail please..what is topping up? Thank you for your help

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...

Yes, it has a high point vent on the plan 11 tubing..or in the case of plan 13, I just want to know how the hydrocarbon vapours are safely vented..

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?

Flexibox - Thanks for the response. It was only a generic question. Great answers folks! Thanks again!

Thanks for a detailed answer JJPellin. But from thermal and pressure distortion, which would be better?

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...

I thought it meant there were some solid particles that got in between faces and scratched them..flexibox..why with dry running does it produce the shiny face? What is the logic behind it?