M Series

ASTM F 998 Close-Coupled Centrifugal Pump

The M Series is our end-suction pump for handling freshwater, seawater, and light hydrocarbons in commercial marine and naval applications.

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Commercial marine and naval applications

Conforming to the requirements of ASTM F 998, including the Navy supplement, hydraulic performance extends to 5,000 GPM and 700 feet of head. This range is covered by twenty-four sizes in 316 SS and CD4MCuN duplex SS as the standard materials. Installation can be as either a horizontal close-coupled or vertically mounted unit.

Designed to meet the military’s need for a commercial-off-the-shelf (COTS) pump, all models are back pull out designs with replaceable wear rings and enclosed impellers dynamically balanced to ANSIS2.19, Grade G6.3 guidelines. These features combine to produce shaft deflections of less than 0.002″ at shutoff, and overall offer some of the most efficient hydraulics to be found in a pump of this type anywhere.

Options for the M Series include a shock approved version, polymeric casing coatings, cyclone separators, and vibration detection devices. Along with these, Ni-Al-Br and 70/30 CuNi casings, U.S. Navy approved composite impellers, shaft sleeves and wear rings, and a full range of motor and baseplate choices are also available. Noise, shock, vibration, and endurance testing to U.S. military specifications are also offered.


Flows To

5,000 GPM

1,100 m3/hr
Heads To

700 ft.

200 m
Efficiencies To


Power To

200 HP

150 KW
Speeds Up To

3,550 RPM

Temperatures To

300° F

150° C


Hydraulic Coverage


Materials of Construction

Design Data



Most sizes rotatable in 90° increments for added flexibility in meeting shipboard piping configurations.



Short impeller overhangs maintain shaft deflections under 0.002″. All drain, vent, and gauge connections are straight thread, O-ring type for positive sealing.



Enclosed type with features to reduce axial thrust loads that will provide longer components life.


Composite Internals

Composite impellers, wear rings and shaft sleeves per NAVSEA drawing 803-7226047 reduce corrosion, increase pump life, and greatly reduce pump weight.


Back Pull Out

Allows inspection, maintenance, and overhaul of all rotating elements, including the shaft, impeller, and mechanical seal, without disturbing system piping.


Mechanical Seal

In accordance with ASTM F 1511 with carbon on silicon carbide faces standard and auxiliary throttle bushing for added protection from catastrophic seal failure. Cyclone separators will be provided on all sea water applications.


Close Coupled Design

Smaller and lighter envelope than traditional split case or frame mounted designs that totally eliminates pump bearing, shaft couplings, and pump/motor alignment issues.



M Series Brochure

2004 (774 KB)

Technical Manuals

M Series - IOM (2 MB) Download
M Series Techbook - (9 MB) Download

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Featured Story

Meeting the Stringent Environmental Qualification Requirements of Mil-STD-810G

Carver Pump is one of the leading pump suppliers to the US Navy and has been providing centrifugal pumps since World War II.  Carver pumps are installed on all current ship building programs (i.e., Ford Carriers, Zumwalt Destroyers, Aegis Destroyers, Littoral Combat Ships, America Big Deck Amphibious Assault Ships, San Antonio Amphibious Transport Docks and Virginia Submarines).  Carver’s reputation within the Navy community over the years has led to opportunities with other branches of the armed forces, including the Coast Guard and Army. After undergoing a competitive selection process, Carver Pump was awarded a contract to replace radar cooling pumps that failed to meet reliability requirements.  These pumps are used to cool the transportable radars that operate as part of the THAAD (Terminal High Altitude Area Defense) and are designed to be operated all over the world.  The program is managed by the MDA (Missile Defense Agency) and the system is owned by the US Army.  Reliability plus weight were the major factors in the pump selection process

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