Mechanical seals used for vertical sump type naphtha transfer pumps|||Due to the nature of naptha (low lubricating value, great solvent!) (is this for gas turbine use?), pumps with seals are a major problem. Consider a "canned" pump without seals.
If you've got to go with an elastomer seal, use Viton. It will hold up better than just about anything... (so long as you're not trying to hold shuttle boosters together in cold weather - ouch).
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