Type of Seal for VS4 Pumps

Too many unidentified acronyms and numbers.

According to my AT&T data, the SPF will not be as effective at 15 as it would at 30. The ITT is a BMOC at best for your service conditions.

Plan 53 is always better than ITT if you're a little gassy.

There are a variety of seals that will work in the VS4 pump...The numbers you quote may in fact be the same seal...

Do you reffer 'Triethylene Glycol' by TEG? If yes, does the pumpage has H20 and traces of hydrocorbans or pure TEG? These details might help in desiding the most suitated seal for the perticuler application. And there could be more options to choose from as indicated by: SolarEagle.

Both plans 23 as well 53 could be possible, while the former is simpler and could be cheeper than later. When experts says 23 is not possible, it does not mean that for all VS4 pumps. May have some reason for their inablity/limitation to employ 23 at that perticuler location, on that perticuler pump seal cavity etc. Of course 53 should be more safer (as well complicated:)

Check yourself for the pros and cons of both plans:

Plan 23:

Plan53:

Since this is a Vertical Submerged pump with an open impeller the 2 descriptions shown are more in line with your API closed impeller single impeller overhung pump design.

The plan 23 seems in line with the old Plan D discharge cooled flush plan where you had to cool down from the outlet temperature and generally go through a strainer, orifice and the cooler to provide a clean cooled pumped fluid to the seal chamber which at the suction pressure could be below the flash point and you wanted to eliminate any chance of inward air leakage so the pressure to the seal chamber was above the atmospheric. This was generally used on single seal stuffing boxes.

The Plan 53 seems like a plan where you wanted a clean buffer fluid, compatible with the pumped fluid, but where you would prevent outward leakage of the product due to some physical property but could allow inward leakage of the buffer fluid. Sometimes just a clean cool stream of the same fluid would be used as the buffer. This often required the use of two seals, one inboard and one outboard with the buffer fluid injected between.

I think that they are saying here that the pump itself is submerged and there is no provision for an internal pumping ring so you must supply the seal fluid from a different area and not the pimp itself. You may be able to simply take it off the discharge piping and run it through a strainer and orifice and cooler if needed back to the seal area at the tank flange assuming it is mounted on some sort of sump or tank.