Appendix B—Specifications for Vertical Double-Acting Model D891/FD891
Material Specifications
Part Standard Material
Head, cylinder, and cylinder cap Ductile iron ASTM A536
Crosshead guide Gray iron ASTM A48, Class 30
Crankcase, flywheel Gray iron ASTM A48, Class 30
Bearing carrier Gray iron ASTM A48, Class 30
Flange ASTM A36 carbon steel (D891 only)
Valve seat, bumper 17-7 PH stainless steel
Valve plate PEEK
Valve spring 17-7 PH stainless steel
Valve gaskets Soft aluminum
Piston Ductile iron ASTM A536
Piston rod 1045 steel, Nitrotec
Crosshead Ductile iron ASTM A536
Piston rings PTFE, glass and moly filled
Piston ring expanders 302 stainless steel
Packing cartridge and barrel Ductile iron ASTM A536
Connecting rod Ductile iron ASTM A536
Segmented packing Carbon filled PTFE
V-ring packing Alloy 50
Crankshaft Ductile iron ASTM A536
Connecting rod bearing Bimetal D-2 SAE 12
Wrist pin C1018 steel or equivalent
Wrist pin bushing Bronze SAE J461
Main bearing Tapered roller
Inspection plate Aluminum
O-rings Buna-N or Neoprene
®1
(optional)
Retainer rings Steel
Miscellaneous gaskets Rubber compositions
1
Registered trademark of the DuPont company.
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