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API Standard Product

API682
“Sealing systems for centrifugal pumps, API682”is the title of the standard issued by the American Petroleum Institute for pumps in the hydrocarbon processing industry. The API682, 2nd edition, to ISO/NP21049, contains sealing and supply systems for applications in refineries and the chemical industry 
Seal type :
Type A o-ring seal 
• Rotating o-ring seal with multiple spring 
• Sliding faces: reaction-bonded silicon carbide against blistering-resistant carbon 
• Fluoroelastomer o-rings 
• Hastelloy c-springs 
• Metallic components (cove, shaft sleeve etc.) made of stainless steel (type316) 
• Floating carbon throttle in the seal cover on the atmosphere side 
Type B bellows seal 
• Rotating metal bellows seal with O-ring secondary seals 
• Sliding faces : reaction-bonded silicon carbide against blistering-resistant carbon 
• Fluoroelastomer O-ring 
• Hastelloy C bellows 
• Metallic components (cove, shaft sleeve etc.) made of stainless steel (type316) 
• Floating carbon throttle in the seal cover on the atmosphere side 
Type C bellows seal 
• Stationary metal bellows seal with graphite secondary seals 
• Sliding faces: reaction-bonded silicon carbide against blistering-resistant carbon 
• Graphite secondary seals 
• Inconel 718 bellows 
• Metallic components (cove, shaft sleeve etc.) made of stainless steel (type316) 
• Floating carbon throttle in the seal cover on the atmosphere side 

API682 covers the following ranges:
• Shaft sizes: 20 to 110 mm 
• Temperatures:-40℃ to +400℃ 
• Pressures:0 bar absolute to 42 bar absolute 
• API682 includes a seal selection procedure as well as an aid for selecting buffer/quench fluids, seal supply systems and modes of operation 
• Cartridge solutions are specified for all applications. API682 requires all parts of the seal (including its cover and shaft sleeve) to be supplied by the seal manufacturer 
• For the purposes of qualifying the seals all standard types and arrangements have to be put through stipulated dynamic trial runs under defined condition