This specification defines the requirements for **rotary positive displacement pumps for shipboard use**. This specification does not include pumps for hydraulic service or cargo unloading applications.

Pumps under this specification include the following types and classes: Type II, Type III, Type IV, Type V, Type VIII, Type X, Type XI, Class A, Class B, Class CD, Class CH, Class DD, Class DH, Class G, Class LM, Class LA, Class M, and Class W.

Pump component parts such as casings, heads, and covers; shafts; rotors; rotor housings, liners, and disks; glands; bedplates and brackets; timing gears; fasteners (studs, bolts, screws, and nuts); O-rings and other elastomers; gaskets; and vanes and shoes, shall be constructed of the specified materials.

General requirements for the following are detailed:

• (1) service life
• (2) operation during inclinations
• (3) environmental vibration
• (4) internally excited vibration levels
• (5) airborne noise level
• (6) driver
• (7) reduction gears
• (8) mounting of horizontal and vertical pumps
• (9) seating surface
• (10) face mounted motors
• (11) couplings
• (12) direction of rotation
• (13) inlet and outlet connections

Pump design and construction requirements for the following are specified:

• (1) flanges
• (2) pump casing
• (3) radial and thrust bearings
• (4) rolling contact bearings
• (5) mechanical shaft seals
• (6) backup packing box
• (7) pump head or end covers
• (8) rotors and timing gears
• (9) fasteners

The pump shall meet the required rated capacity.

Requirements for the following are also specified:

• (1) painting and coating
• (2) testing including hydrostatic test, mechanical running test, and performance test

1.1 This specification defines the requirements applicable to design and construction of rotary positive displacement pumps for shipboard use. The classes of service are shown in Section 4.

1.2 This specification will not include pumps for hydraulic service or cargo unloading applications.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.