API STD 11E-1937
SPECIFICATIONS FOR RATING OF PUMPING MACHINES INCLUDING RATING FORM FOR ROTARY COUNTERBALANCES (Second Edition)

Standard No.

API STD 11E-1937

Release Date

1937

Published By

API - American Petroleum Institute

Scope

These specification do not include dimensional data@ but do cover the horsepower@ torque and crank pull reduction gears for oil-well pumping. Similar ratings on chain-driven and other types of units may be considered for future adoption.