Specialist Pump Designs

Whilst the basic hydraulic and mechanical aspects of our pumps are from established parameters, each unit is custom engineered to suit our clients’ process application. This flexible approach ensures the optimum features essential for trouble free, low maintenance installation.

Particular areas of expertise for built to order equipment include, but are not limited to:

  • Low Flow, High Head pump designs
  • Low NPSH pump designs
  • Recessed Impeller pump designs (vortex flow)
  • Externally Tank Mounted VS4 pumps
  • Specially Engineered, bespoke, tailor made, designed to order, engineered solution
  • Exotic materials (any commercially available raw material)
  • Molten Sulphur, Salts & Metals
  • Molten Plastics high temperature pumps
  • Acid pumps
  • High Pressure pump designs

Horizontal Low Flow, High Head Pumps (API 610 OH2)

This range was originally conceived to fulfil a growing market need for low-flow, medium/high head duty requirements utilising proven, uncomplicated, conventional pump hydraulic designs at normal synchronous speeds. Pumps are produced in OH2 designation conforming to API 610 standards, although other specific design requirements can be accommodated.

Circular, concentric casing design reduces radial loads by as much as 85% at low flowrates reducing shaft vibration and extending MTBF, radial bearing and mechanical seal life.

Using 3D printed components combined with our preference for fabricated construction using machined from solid material techniques, the resulting hydraulic end has a greater thickness with up to five times denser, homogenous structure, far stronger and longer lasting than cast components.

Flowrates up to 20m3/hr with differential heads up to 500m are achievable with very advanced impeller eye characteristics enabling very low NPSHR . Due to the normal synchronous speeds, no additional noise attenuation is required.

Molten Salts and Metals Pumps

A major area of PATS’ expertise is in the design and manufacture of steam jacketed pumps for molten sulphur, salts and metals. Over many years PATS has constantly refined the features based on operational experience and customer feedback.

Pump are designed to API 610 11th Edition specifications and are generally of fabricated construction using machined from solid material techniques, form milled from certified billet, plate and bar materials. This gives a much greater hydraulic end thickness with up to five times denser and homogenous structure, far stronger and longer lasting than the cast components. This also eliminates any casting failure, cold shuts, core shift and porosity issues giving a much greater service life over cast component equivalents.

Shaft diameters for VS4 pumps are kept to 60mm as a minimum and are of ‘stiff shaft’ design to ensure the unit does not pass through first critical speed to reach its operating speed. API 610 maximum spacing between line shaft bearings is adhered to as a minimum, frequently PATS’ spacing is shorter. One piece shafts are available to 4m lengths, for longer applications, two piece construction would be offered with properly engineered keyed shaft couplings. This all has a positive effect to minimise vibration levels and extend the lifespan of the unit.

Line shaft bearings feature a unique fully floating bush design which evens out any wear over the entire bush surface and greatly extends lifespan. Bushes are positively fed from fully steam jacketed discharge pipework to ensure non-interrupted lubrication. All units include extensive steam jacketing which is fully integral into the pump wet-end design which is technically superior, stronger and longer lasting than cast-in, weld on, or bolt on jackets which are always an inferior compromise designed to fit a standard wet end design. This integral design eliminates any cold spots within the pump which could lead to bearing starvation and blockages and enables the sulphur to drain down when the unit is removed for servicing. Fully open impellers are considered mandatory design, preventing any potential blockages as there are no fine clearances, this makes the units tolerant of entrained solids and gas, with the added ability of being able to accommodate viscosity variation.

Vapour sealing is effectively controlled by a simple stuffing box arrangement with rings of dry-running packing. Other mechanical seals and systems can be used if the service is sour. The main support column has been designed with spill-back holes to allow liquid to flow back to the vessel or pit, thus ensuring that the top shaft sealing is confined to vapours only, not liquid.

Recessed Impeller Pumps

PATS’ range of Recessed Impeller Pumps have been developed over many years and are designed to offer unrivalled clog-free performance and superior low shear capabilities.

The non-clogging wet-end design has no close running clearances or abrupt changes in direction or velocity enabling the pumping of large solids, fibrous solids, erosive slurries, and soft clogging slurries without issue. The matched suction and discharge nozzle sizes maximising large solids handling capabilities whilst minimising velocity change.

The unique design of impeller provides exceptional gas handling properties whilst minimising axial thrust loadings in order to give extremely long service life essential for a trouble free, low maintenance installation.

Superior abrasion resistance is maintained by the unique casing and impeller design which imparts the vortex action causing very little solid content to come into contact with the impeller, minimising abrasive wear and maintaining solids integrity.

The low shear capabilities of the pump allow delicate solids to be pumped in liquid suspension without damage and minimal emulsification of either separated liquids or shear sensitive liquids.

PATS’ recessed impeller pump designs are available in both horizontal and vertical configurations and can be supplied to API 610 11th Edition for the petrochemical, oil and gas markets or ISO 5199/ANSI B73.1 standards for chemical and industrial markets.