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what the letters in the seal code BSTFN is from Table H7 of API 610 8th edition by cloa
Posted: 6 Oct 12

For a vertically suspended cooling tower sump pump if that helps any. Materials for the pump are to Table H1, material class S1. Seal includes API flush plan 13.

I only have API 610, 9th edition so I'm afraid the old 8th edition codes are a bit of a mystery.

Check out the FAQ
area for this forum!

pmover (Mechanical)
17 May 06 11:16

3rd letter
T - Seal gland type (P = plain, no throttle bushing; T = throttle bushing with quench, leakage and/or drain connections; A = auxilary sealing device, type to be specified) Note: See

4th letter
Gasket Materials (see Table H-4)
Table H-4 (S/Ring - Seal Ring)
Letter Stationary S/Ring Gasket S/Ring to Sleeve Gasket
H Nitrile Nitrile
I FFKM FFKM Elastomer
R Graphite Foil Graphite Foil
X As specified As specified
Z Spiral wound Spiral wound

5th Letter
Face Materials (See Table H-5)

Table H-5
5th Letter Ring 1 Ring 2
L Carbon Tungsten carbide 1
M Carbon Tungsten carbide 2
N Carbon Silicon carbide
O Tungsten carbide 2 Silicon carbide
P Silicon carbide Silicon carbide
X As specified As specified


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