What are the annotations for API682 mechanical seals?

What are the annotations for API682 mechanical seals?

1. Unless otherwise specified, Hastelloy alloy must use multi torsion spring closure spring material (Hastelloy C). Single torsion spring closure spring material must use austenitic stainless steel (AISI basic type 316 or equivalent material). Other metal parts should also be made of austenitic stainless steel (AISI basic type 316 or equivalent material) or other corrosion-resistant materials within the applicable range. However, for metal corrugated pipes, if metal corrugated pipes are used, the material should be recommended by the sealing manufacturer according to the applicable range. The corrosion depth of metal corrugated pipes should be less than 50 μ m (2mils, mil) per year.

2. Unless otherwise specified, the seal between the sealing plate (i.e. sealing rotating cover) and the sealing chamber should use a fluorine rubber O-ring, with a usage temperature below 150C (300) ° F. If the temperature exceeds 150C or there are requirements, a graphite filled austenitic stainless steel spiral wrap pad must be used. The spiral wrap pad must be able to withstand the full temperature of the pumped liquid (i.e. without cooling).

3. Metal sealing rings should not be covered with spray coating instead of integrated sealing end faces.

4. If the pumping temperature exceeds 175C (350C) ° F, the pump factory and the sealing factory should jointly discuss the refrigeration flushing liquid for the sealing end face or the continuous circulating cooling water chamber for the sealing chamber.

5. The temperature jx of the mechanical sealing gasket (sealing ring) should meet the requirements in the table. The temperature jx of the mechanical seal gasket and wave tube should indicate a: please understand the manufacturer's low operating temperature or pumping temperature.

Note a: Please consult the manufacturer for the low and high ambient temperatures or pumping temperatures.