September 2008

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HP Reliability: API-682: the internal clearance issue

 While the operating characteristics and run-length capabilities of all dual-mechanical seals are strongly influenced by the condition of the fluid in the sealing cavity, seal life expectancy is ..

Bloch, Heinz P., Hydrocarbon Processing Staff

 While the operating characteristics and run-length capabilities of all dual-mechanical seals are strongly influenced by the condition of the fluid in the sealing cavity, seal life expectancy is also affected by purely mechanical parameters within the seal. Joined by several experienced colleagues I found that, for compelling and technically sound reasons, API-682 dealt with best-practice mechanical seal designs and also defined a radial clearance. This radial clearance, between the rotor and stator, is 0.060 in. (1.5 mm) and represents, as it should, a fairly liberal (open) clearance (Fig. 1). However, some major manufacturers of mechanical seals are supplying seals with internal clear

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