Scope This standard covers the minimum requirements for centrifugal pumps, including pumps running in reverse as hydraulic power recovery turbines, for use in petroleum, heavy duty chemical, and gas industry services. Note: A bullet (--)at the beginning of a paragraph indicates that either a decision of further information is required. Further information should be shown on the data sheets (see Appendix B)or stated in the quotation request and purchase order. The pump types covered by this standard can be broadly classified as overhung, between bearings, and vertically suspended (see Figure 1-1). To aid the use of this standard, Sections 2, 3, 4, and 6 cover requirements that are applicable to two or more of these broad classifications. Section 5 is divided into 3 subsections and covers requirements unique to each of the broad classifications. Figure 1-2 shows the various specific pump types within each broad classification and lists the identification assigned to each specific type. The pump types listed in Table 1-1 have special design characteristics and shall be furnished only when specified by the purchaser and when the manufacturer has proven experience for the specific application. Table 1-1 lists the principal special considerations for these pump types and shows in parentheses the relevant paragraph(s) of API Standard 610. For nonflammable, nonhazardous services not exceeding any of the limits below, purchasers may wish to consider pumps that do not comply with API Standard 610.