本标准涵盖了石油、石化和天然气工业服务中使用的往复式控制容积泵和泵装置的最低要求。这些泵要么是液压隔膜泵，要么是填料柱塞泵。不包括旋转式容积泵。使用直接机械驱动的隔膜泵也不包括在内。注:容积式往复泵见API 674，容积式旋转泵见API 670。本标准要求买方指定某些细节和特征。段落开头的项目符号表示需要买方的决定或进一步信息。更多信息应显示在数据表上（见附录A中的示例），或在报价申请和采购订单中说明。 第6节和第6节中的替代设计存在冲突。

This standard covers the minimum requirements for reciprocating, controlled volume pumps and pump units for use in the petroleum, petrochemical, and gas industry services. These pumps are either hydraulic diaphragm or packed plunger design. Rotary positive displacement pumps are not included. Diaphragm pumps that use direct mechanical actuation are also excluded.NOTE: See API 674 for positive displacement reciprocating pumps and API 670 for positive displacement rotary pumps.This standard requires the Purchaser to specify certain details and features. A bullet at the beginning of a paragraph indicates that either a decision by, or further information from, the Purchaser is required. Further information should be shown on the data sheets (see example in Annex A) or stated in the quotation request and purchase order.Alternate Designs and Conflicting Requirements are now located in Section 6.