Page 284 - The Tribology Handbook

Mechanical seals 924

Table 24.9 Selection of materials for hydrocarbons
Suitable seal ring malerials
for corrosion resistance*
0
0 0
0 0
0
Y
4
1 Other seal
Y C component Remarks
I 2 materials

~~
Acetone 17/2 stainless steel
Arcton 9 17/2 stainless steel
Benzene 17/2 stainless steel
Butadiene 17/2 stainless steel
Butane 17/2 stainless steel
Butyl alcohol 17/2 stainless steel
Butylene 18/8 stainless steel
Cumene 18/8 stainless steel
Cyclohexane 17/2 stainless steel
Dimethyl ketone 17/2 stainless steel
Ethane 17/2 stainless steel
Ethylene 17/2 stainless steel
Ethylene glycol 17/2 stainless steel
Formaldehyde 17/2 stainless steel
Freon i 1 17/2 stainless steel
Freon 12 17/2 stainless steel
Freon 22 17/2 stainless steel
Furfural 17/2 stainless steel Use double seals above 121"C, use
permanent quench below 121°C
Hexane 17/2 stainless steel
Is0 butane 17/2 stainless steel
Is0 pentane 17/2 stainless steel
Is0 propyl alcohol 17/2 stainless steel
Methyl alcohol 17/2 stainless steel
Methyl chloride 17/2 stainless steel Use Monel spring
Methyl ethyl ketfone 17/2 stainless steel
Pentane I7/2 stainless steel
Phenol 18/8 stainless steel Avoid solidification at seal
Propane 17/2 stainless stwl
Propyl alcohol 17/2 stainless steel
Propylene 17/2 stainless steel
Soap solutions 18/8 stainless steel Avoid solidification at seal
Styrene 18/8 stainless steel
Toluene 17/2 stainless steel
Urea (ammonia 'contaminated) 18/8 stainless steel Avoid crystallising conditions at seal
Urea (ammonia free) 17/2 stainless steel Avoid crystallising conditions at seal
Vinyl chloride 18/8 stainless steel
E = Ethylene propylene synthetic rubber
N = High Nitrile synthetic rubber
Seal Packing code V = Viton A fluorocarbon elastomer
P = PTFE or perfluoro-elastomer or graphite
Unless otherwise stated in remarks column PTFE can be used as the seal packing between - 100°C and 250°C.
To avoid solidification at the seal on high viscosity products, heat the seal area and circulation lines 30 minutes before start-up.
To avoid crystallising conditions at seal use the quench feature or clean solvent injection into the seal chamber through the circulation
connections.

B24.8