Girdlestone 920 - ISO 5199 Pump

The Amarinth equivalent of the Girdlestone 920 Motorpump Range consists of single stage, end suction, close coupled centrifugal pumps, with a back pull out facility which allows the complete rotating assembly to be removed without disturbing the suction or discharge pipe-work. In addition all pumps, except 25mm outlet types, include the unique 900 Series front access feature, which allows the impeller and seal assembly to be withdrawn from the suction end. These practical design features enable routine maintenance to be carried out with minimal downtime.

The modular construction provides a high degree of interchangeability and commonality of parts with other pumps in the 900 Series.

All 920 pumps are of a robust design, which incorporates a cast impeller directly driven by a standard metric frame electric motor and a fabricated motor pump adaptor. The 900 series design provides the optimum seal environment and allows most types of single seal to be fitted with provision for an optimum quench.


Using modern computer aided design software the pumps are specifically designed as a heavy duty, minimal wear, long life pump which has be designed in a modular way, with a number of options available, to ensure full compliance to the customers exact requirements and specifications. A heavy duty baseplate helps achieve low vibration and noise levels which in turn extends the pump's life and ensures maximum running time.

The pumps can be fitted with a variety of proprietary components (i.e. seals, motors & couplings) from all the major manufacturers to cater for customers site preferences. Pumps using double mechanical seal arrangements can be fitted with a seal support system attached. This can be supplied by Protect System, which is designed and manufactured by Amarinth, or another manufacturer's seal support system can be fitted.

To complete the package a full range of standard material options from cast iron and stainless steel, to super duplex and hastelloy are available to match your process fluid. NACE & NORSOK compliant materials are also available. Standard documentation packs including manufacturing data books, material certification, installation & operating manuals are available to suit the application. Performance testing to BS EN 25199 / ISO 5199 and various NDE (non destructive examination) & 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


General description

A range of single stage centrifugal end suction pumps with centreline discharge manufactured in a variety of alloys. All pumps and individual components are fully interchangeable with the equivalent Girdlestone 900 series unit.


Front and back pullout design with metal to metal fits

Design methodology

Advanced computer techniques including 3D modelling, FEA & CFD

Design standards

ISO 5199 : 2002
ATEX EC-Directive 94/9/EC

Design pressure rating

16 bar g @ 20°C

Suction pressure rating

6.5 bar g (closed coupled)

Temperature rating

-5°C to 120°C (close coupled)

Flow rate

Up to 1,100m³/h

Differential head

Up to 225m


Up to 3600 rpm


Long coupled pump
Close coupled pump
Bareshaft pump
Rotating assembly

Frame sizes

040x025x145 to 250x200x510

Design life

20 years (2 years uninterrupted operation)


Amarinth N Series pumps are available in a variety of materials as standard which include the following pump / impeller combinations.

Other alloys, including NACE compliant materials are available on request and our foundries are NORSOK approved.

In addition we offer specific NDT and component documentation to ensure compliance to your exact requirements.

Materials Casing Impeller
Stainless steel 316 / Stainless steel 316 ASTM A744 CF-8M ASTM A744 CF-8M
Cast iron / Cast iron BS EN 1561 Gr EN-GJL-250 BS EN 1561 Gr EN-GJL-250
Cast iron / Stainless steel 316 BS EN 1561 Gr EN-GJL-250 ASTM A744 CF-8M
SG iron / Stainless steel 316 BS EN 1563 Gr EN-GJS-400-18-LT ASTM A744 CF-8M
Carbon steel / Stainless steel 316 ASTM A216 WCB ASTM A744 CF-8M
Carbon steel / 12% Chrome stainless steel ASTM A216 WCB ASTM A217 Gr CA 15
Duplex stainless steel / Duplex stainless steel ASTM A890 Gr 1B CD-4MCuN ASTM A890 Gr 1B CD-4MCuN
Super duplex stainless steel / Super duplex stainless steel ASTM A890 Gr 6A (UNS J93380) ASTM A890 Gr 6A (UNS J93380)
Hastelloy B / Hastelloy B ASTM A494 Gr N-7M ASTM A494 Gr N-7M
Hastelloy C / Hastelloy C ASTM A494 GrCW-12MW ASTM A494 GrCW-12MW
Monel / Monel ASTM A494 GrM35-1 ASTM A494 GrM35-1
Titanium / Titanium ASTM B367 Gr C-2 ASTM B367 Gr C-2