Girdlestone Industrial - URF/USM Pump

Used for many years on an ever increasing variety of applications, the Girdlestone URF and USM range of pumps, with its unique design, adaptability and outstanding performance, has contributed substantially to the general acceptance of close-coupled motor pumps by industry.

Amarinth’s equivalent to the Gridlestone URF and USM range of pumps  is fully interchangeable both hydraulically and dimensionally requiring no pipework modifications and provides many more years of reliable service from this proven workhorse.

The units are available in both close-coupled and direct coupled formation, with a variety of mechanical sealing options.

Materials of construction include stainless steel, bronze, cast iron, and a selection of sophisticated alloys, for highly corrosive or erosive applications.

Construction is kept simple and incorporates the back and  front pull out designs depending upon your needs.

Using modern computer aided design software the pumps are designed as a light to medium duty, minimal wear, long life pump. The original Girdlestone design has been in use for many decades and is a well proven, reliable workhorse. The Amarinth U Series replacement is aimed at customers who want the same reliability and minimum disruption when a new replacement is required for their existing Girdlestone pump.

To complete the package a full range of standard material options including cast iron, stainless steel and gunmetal are available to match your process fluid. Standard documentation packs including data sheets, material certification, installation and operating manuals are available to suit the application. Performance testing to BS EN 25199 / ISO 5199 and various NDE (non destructive examination) and NDT (non destructive testing) options are offered to ensure full compliance to our customer's specifications. Alternative bespoke packages can be tailored to fit your exact requirements.

For more information about this product please get in touch using one of the methods below.

Hydraulic Performance

Girdlestone URF/USM pumps can be fitted with fixed or variable speed drivers from any manufacturer. More detailed coverage charts list individual pump designations at fixed speeds.


The image below shows a three quarter Isometric cut-out of a long coupled U Series pump. You can also display the following images:

General arrangement drawing
Sectional arrangement drawing


General description

A range of single stage centrifugal end suction pumps with tangential discharge manufactured in a variety of alloys.


Back pullout design with machined abutments

Design methodology

Advanced computer techniques including 3D modelling, FEA & CFD

Design standards

ATEX EC-Directive 94/9/EC (close coupled versions only)

Design pressure rating

10 bar g @ 20°C

Suction pressure rating

6 bar g (long coupled)
3.5 bar g (close coupled)

Temperature rating

-10°C to 200°C (long coupled)
-5°C to 120°C (close coupled)

Design temperature

150°C (standard construction)

Flow rate

Up to 500m³/h

Differential head

Up to 165m


Up to 3600 rpm


Long coupled pump
Close coupled pump
Bareshaft pump

Frame sizes

050x040x159 to 150x125x274

Design life

15 years (2 years uninterrupted operation)


Girdlestone URF / USM pumps are available in a variety of materials as standard which include the following pump / impeller combinations;

Materials Casing Impeller
Cast Iron / Cast Iron BS EN 1561 Gr EN-GJL-250 BS EN 1561 Gr EN-GJL-250
Cast Iron / Gun metal BS EN 1561 Gr EN-GJL-250 BS EN 1982 CC492K-GS
Cast Iron / Stainless steel 316 BS EN 1561 Gr EN-GJL-250 ASTM A744 CF-8M
Stainless steel 316 / Stainless steel 316 BS 3100 316 C12 ASTM A744 CF-8M
Gunmetal / Gunmetal BS 1400 LG2 BS EN 1982 CC492K-GS
Titanium / Titanium ASTM B367 Gr C-2 ASTM B367 Gr C-2