Hughes Pumps HP65 Pump | High Pressure Seawater Pump up to 1000 Bar

The Hughes Pumps HP65 Pump is a high pressure plunger pump designed for demanding seawater and industrial pressure applications. Rated up to 1000 bar at 27 lpm and capable of flows up to 103 lpm at 250 bar, the HP65 offers a versatile solution for operators who need dependable high pressure performance across a wide operating range.

Built with a 316 stainless steel pump head for seawater applications, the HP65 is well suited to harsh marine and offshore environments where corrosion resistance is essential. An optional 431 stainless steel pump head is also available, allowing the pump to be configured for different operating requirements.

The pump is available with a choice of gear ratio to suit either diesel engine or electric motor drive arrangements. For compact installations, an SAE adaptor housing in SAE 3, 4 or 5 can be supplied for flange mounting to a diesel engine flywheel housing. This supports a compact, accurately aligned installation while enclosing moving parts. The HP65 can also be supplied as a bareshaft pump only or as part of a complete unit build.

Internally, the HP65 uses an in-line valve arrangement for high efficiency and to reduce the adverse effects of cyclic stress in the pump head. It also features interchangeable plunger kits, a hardened alloy steel crankshaft, heavy duty roller and steel-backed white metal main bearings supported between each connecting rod, an SG iron crankcase with splash lubrication and oil cooling, and forged connecting rods with low friction shell type big end bearings and lead bronze lined small end bushes. The pump is gear driven, removing the need for belt drive.

The datasheet also lists options such as a pressure gauge, safety valve or burst disc, and solid ceramic or hard coated stainless steel plungers with self-adjusting seals. Hughes also highlights strong seal, plunger, and valve life, helping support dependable performance in demanding duty cycles.

Key Features

• Maximum pressure up to 1000 bar

• Maximum flow up to 103 lpm

• Maximum power 48 kW / 65 HP

• 316 stainless steel pump head for seawater applications

• Optional 431 stainless steel pump head

• Choice of gear ratio for diesel engine or electric motor drive

• Optional SAE adaptor housing for compact engine mounting

• Available as bareshaft pump or complete unit build

• In-line valve arrangement for efficiency and reduced cyclic stress

• Interchangeable plunger kits

• Hardened alloy steel crankshaft

• Heavy duty roller and steel-backed white metal main bearings

• SG iron crankcase with splash lubrication and oil cooling

• Gear driven design

• Optional pressure gauge

• Optional safety valve or burst disc

• ATEX compliant

Typical Applications

The Hughes Pumps HP65 Pump is suitable for a range of high pressure duties, including:

• High pressure seawater pumping

• Offshore and marine pressure systems

• Industrial high pressure water applications

• Engine driven or motor driven pump packages

• Applications requiring compact flange-mounted pump arrangements

• Systems requiring different pressure and flow combinations across multiple plunger sizes and gear ratios

Why Choose the Hughes Pumps HP65 Pump?

The HP65 provides a broad performance envelope, allowing users to configure the pump for higher pressure or higher flow depending on the plunger diameter and gear ratio selected. This makes it a strong option where flexibility is required across a range of duties rather than a single fixed duty point.

Its seawater-compatible materials, compact drive options, oil-cooled crankcase, and heavy duty mechanical construction also make it well suited to offshore, marine, and industrial installations where reliability and service life matter.

Technical Specification

Performance Range

The performance table on page 2 shows multiple configurations depending on plunger diameter, gear ratio, and input speed. The available plunger diameters are 18 mm, 22 mm, 25 mm, 30 mm, and 35 mm, with maximum pressure reducing as plunger size increases and flow rising accordingly.

Example Operating Points

These figures are taken from the upper performance range shown in the page 2 table. The datasheet notes that flowrates are theoretical and reduce by approximately 7.5% at full pressure, with a 45 mm pump stroke.

Frequently Asked Questions

What is the maximum pressure of the Hughes Pumps HP65 Pump?

The HP65 is rated up to 1000 bar at 27 lpm.

What is the maximum flow of the HP65?

The maximum listed flow is 103 lpm at 250 bar.

Is the HP65 suitable for seawater use?

Yes. The standard pump head is 316 stainless steel for seawater applications.

Can the pump be driven by either an engine or an electric motor?

Yes. The HP65 is available with a choice of gear ratio to suit diesel engine or electric motor drive.

Is there a compact engine mounting option?

Yes. An SAE adaptor housing is available in SAE 3, 4 or 5 for flange mounting to a diesel engine flywheel housing.

Is the HP65 available as a pump only or as a package?

Yes. It can be supplied as a bareshaft pump only or as a complete unit build.

What design features support durability?

The pump uses an in-line valve arrangement, hardened alloy steel crankshaft, heavy duty roller and steel-backed white metal main bearings, SG iron crankcase with oil cooling, and forged connecting rods. Optional ceramic or hard coated stainless steel plungers are also available.

Is the Hughes Pumps HP65 Pump ATEX compliant?

Yes. The datasheet lists the HP65 as ATEX compliant.

Enquire about the Hughes Pumps HP65 Pump

For technical details, pricing, or project support:

Email: info@isubc.com

Phone: +44 (0)1253 767788

Hughes Pumps HP65 Pump | High Pressure Seawater Pump up to 1000 Bar

The Hughes Pumps HP65 Pump is a high pressure plunger pump for seawater and industrial applications, delivering up to 1000 bar and 103 lpm with stainless steel pump head options and compact engine or motor drive configurations.

Product SKU: HP65 Pump

Product Brand: Hughes Pumps