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Hastelloy« centrifugal pumps

Hastelloy for outstanding corrosion resistance

Hastelloy is known as a 'superalloy' or 'high-performance alloy'.

MDM has manufactured pumps in Hastelloy C-22«, which is a versatile nickel-chromium-molybdenum-tungsten alloy, with outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking.

Hastelloy centrifugal pump for hygienic applications

All wetted metal parts of the centrifugal pump are machined from Hastelloy solid bar (ie pump cover, impeller, impeller locknut, impeller key, pump stub-shaft, and housing plate). The pump is fitted with a mechanical seal with Hastelloy wetted metal parts.

The non-wetted metal parts of the pump head are manufactured from stainless steel 316L.

As an option the pump can be supplied with an internal surface finish of 0.5ÁmRa (including the wetted metal parts of the mechanical seal).

« Hastelloy and C-22 are the registered trade marks of Haynes International, Inc. www.haynesintl.com/cralloys.htm 

Centrifugal pump, pump.jpg (8 kB)





Brochure, purity.jpg (3 kB) H range curves, Hcurve.jpg (4 kB) H range dimensions, Hdims.jpg (5 kB) Pump manual, Pumpman.jpg (3 kB)
purity.pdf Hcurve. htm Hdims.htm Pump.pdf
Issue 4: 08/04 (404kB)     Issue 8: 01/10 (908kB)
To download the Adobe PDF file, please click on either the image or the file name.


hygienic design

Hastelloy wetted metal parts

pump head non-wetted metal parts in 316L stainless steel

smooth surfaces with minimum 3mm radii

no castings (no porosity), no pressings, no crevices

no rubbing metal parts

excellent surface finishes better than 0.5 ÁmRa available

CE marked

standard motors

easy change pump stub shaft and seals

simple to maintain and reassemble

low NPSH

high efficiency

Stainless steel bar, rolled_steel.jpg (21 kB)

Made from solid bar


ideally suited for industries:



Available as either:



Flooded suction pump (top right), which is used for applications where the pump is flooded with liquid, for example a delivery pump.

Air Separator ('AS') pump (right), which is designed to handle a mixture of air and liquid, eg for emptying product from road tankers, or for scavenging of vessels and pipelines in a CIP (Cleaning In Place) system. For applications where the liquid level is below the inlet of the pump, a liquid reservoir can be supplied to make the 'AS' pump self-priming.

AS pump principles of operation, ASop.jpg (16 kB)



wetted metal parts are in Hastelloy machined from solid bar
materials certification can be provided


internal finish is 3.6 ÁmRa for the machined 'Uniform' finish, and 0.8 ÁmRa for the 'Pure' finish. 0.4 or 0.5 ÁmRa are available as an option
external finish is as machined

connections inlet and outlet can be DIN11851, Tri-clamp, IDF, SMS, RJT, flanged etc.  
mechanical seal

FDA compliant seal

electric motor

standard IP55, 2 or 4 pole 3 phase 380-415V aluminium or cast iron frame IE2 / IE3
options include IE4 motors, thermistors for inverter drive, ATEX, single phase 220-240V

flow rates to 360 m3/hr  
head to 160 m  
viscosity to 200 cP  
accessories stainless steel trolley for mobile operation
stainless steel motor cowl
stainless steel free standing base
  for other options and a competitive quotation please contact our sales department  


- for more information on standards and legislation, eg ATEX, EHEDG, FDA.