Appendix B—Vertical Double-Acting Specifications
Equipment Type & Options
Double-acting, vertical, reciprocating piston type compressor
Two-stage configuration (model 791 only)
Double packed rod (models D791 & D891); triple packed rod (models T791 & T891)
Slip-on weld connections
Features & Benefits
Self-lubricating piston rings: Non-lubricated operation to minimize oil in gas
Multiple materials and configurations: Versatility for your application
Multiple mounting configurations: Versatility for your application
High efficiency valves: Quiet, reliable operation
Reversible oil pump: Allows operation in either direction
Simplified top down design: Routine maintenance is minimally invasive
Part Standard Material Optional Material
Head, cylinder, cylinder cap Ductile iron ASTM A536
Crosshead guide
Gray iron ASTM A48, Class 30Crankcase, flywheel
Bearing carrier
Flange ASTM A36 carbon steel
Valve seat, bumper 17-7 PH stainless steel
Valve plate 410 stainless steel PEEK
Valve spring 17-7 PH stainless steel
Valve gaskets Soft aluminum Copper, iron-lead
Piston Ductile iron ASTM A536
Piston rod 1045 steel, Nitrotec
Crosshead Ductile iron ASTM A536
Piston rings PTFE, glass and moly filled Alloy 50, PEEK
Piston ring expanders 302 stainless steel
Packing cartridge and barrel
Ductile iron ASTM A536
Connecting rod
Segmented packing rings Carbon-filled PTFE
V-ring packing Filled reinforced PTFE
Crankshaft Ductile iron ASTM A536
Connecting rod bearing Bimetal SAE 12 babbit
Wrist pin C1018 steel or equivalent
Wrist pin bushing Bronze SAE J461
Main bearing Tapered roller
Inspection plate Aluminum
O-rings Buna-N PTFE, Viton
®1
, Neoprene
®1
Retainer rings Steel
Miscellaneous gaskets Rubber compositions
Material Specifications
1
Registered trademarks of the DuPont company.
B. Vertical Double-Acting Specifications
22
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