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Brand: Flowserve
Flowserve HPX-Mag API 685 Sealless Magnetic Drive Pump
Description
Flowserve HPX-Mag API 685 sealless magnetic drive process pump
The Flowserve HPX-Mag is a horizontal, overhung, single-stage, radially split, end-suction, top-discharge, centerline-mounted pump with a magnetic coupling in place of a shaft seal. Flowserve describes it as the first API 685 sealless magnetic drive pump to combine secondary pressure containment with integrated solids-handling capability. The aim is zero emissions even if the primary containment shell fails. Seven Star LLC supplies the HPX-Mag in Oman and the GCC as an independent supplier in Muscat. It is aimed at toxic, aggressive, flammable and difficult-to-seal liquids in oil, gas and petrochemical plants.
The hydraulic end is the one used in the Flowserve HPX API 610 pump, so the casing, impeller and many parts interchange with the HPX, which is useful where a plant already stocks HPX spares. What changes is the drive end: a containment shell separates the process fluid from the motor side, and the drive torque is transmitted through high-torque samarium-cobalt magnets, so no mechanical seal or external flush is needed in normal operation.
Understanding HPX-Mag, API 685 and API 610
| Term | Meaning |
|---|---|
| HPX | Flowserve OH2 process pump family to API 610 |
| HPX-Mag | Sealless magnetic drive variant of the HPX hydraulics, designed to API 685 |
| API 685 | Standard for sealless centrifugal pumps for petroleum, petrochemical and gas industry process service |
| Primary containment shell | Thin shell between inner and outer magnet rotors, made of alloy C4 or optional ceramic ZrO2 |
| Secondary containment | Pressure casing and instrumented lantern that retain fluid if the primary shell fails |
HPX-Mag technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Flowserve / HPX-Mag (API 685 magnetic drive process pump, HPX hydraulics) |
| Pump type | Horizontal, overhung, single-stage, radially split, end suction, top discharge, centerline mounted |
| Rated flow | Up to 1,000 m³/h (4,400 gpm) |
| Head | Up to 300 m (985 ft) |
| Standard pressure | Up to 42 bar (600 psi); higher on request |
| Temperature | –29 to 300 °C (–20 to 570 °F); higher on request |
| Containment shell | Alloy C4, or ceramic ZrO2 for zero eddy-current losses; self-venting and fully drainable |
| Magnets | Rare earth samarium-cobalt, high torque |
| Bearings (pump) | Silicon carbide radial and thrust sleeve bearings, lubricated by the process liquid |
| Thrust balancing | Dynamic thrust-balancing system; no mechanical thrust bearings |
| Wear rings | Renewable casing and impeller rings, secured by set screws or tack welds |
| Secondary casing | Designed for pressures up to 42 bar (600 psi); spiral wound gasket |
| Drive-end bearings | Antifriction type, stand-by life of 25,000 hours; isolators for oil mist or oil bath |
How the HPX-Mag works
A motor-driven outer magnet assembly turns an inner magnet assembly fixed to the impeller shaft, and the torque passes through the non-magnetic containment shell without any contact. The process fluid circulates internally to cool the magnet area and lubricate the sleeve bearings; external flush plans can be provided on request. A dynamic thrust-balancing system removes the need for mechanical thrust bearings, a common wear point, which reduces vibration and energy loss.
The secondary containment concept is the main step beyond a conventional mag-drive pump. Instruments on the intermediate lantern detect a shell failure by a pressure signal on the secondary casing or by a liquid sensor at the lantern low point, and the drive-end bearings are designed for a stand-by life that guarantees a containment and control duty of at least 24 hours. Backup renewable rings of non-sparking material protect the shell.
Where the HPX-Mag fits with other Flowserve pumps
On this site the HPX and HPX-V pages describe the API 610 versions with mechanical seals, the PHL describes the diffuser style OH2 pump and the Durco Mark 3 Guardian is the chemical-process sealless pump. The HPX-Mag sits between: API process hydraulics and construction combined with a sealless drive. Choose a sealed HPX where solids content, temperature or dry-running risk makes magnetic drive unsuitable.
Selection and ordering checklist for the HPX-Mag
- Liquid, temperature, vapour pressure, viscosity and the presence of solids; the pump handles some solids through its integrated capability.
- Flow, head and NPSH available.
- Containment shell: alloy C4 for most services or ceramic ZrO2 where eddy-current heat must be avoided.
- Design pressure of the secondary casing and flange rating.
- Internal or external flush plan and instruments for shell failure detection.
- Bearing lubrication: oil mist, oil purge, fan cooling or finned water cooling inserts.
- Driver, IEC or NEMA frame, and site frequency.
- Documentation, testing and API 685 requirements.
Installation, commissioning and maintenance
Sealless pumps depend on the process liquid for cooling and bearing lubrication, so they must never run dry or against a closed discharge for long. Fit a low-flow and dry-run protection scheme and commission the instruments on the intermediate lantern. The back pullout design allows service without disturbing motor or piping, and a contained back pullout keeps the process fluid confined during drive-end maintenance, so the pump need not be drained or purged. Fully assembled replacement kits are listed for the impeller assembly, magnetic rotors and bearing assembly, and the silicon carbide components are fully replaceable.
Typical applications of the HPX-Mag in Oman and the GCC
Flowserve lists petroleum production, distribution and refining, petrochemical and chemical processing, difficult-to-seal liquids, toxic, aggressive or flammable liquids, high-temperature duty, gas industry services, biofuels, boiler circulation and power plants. In Oman and the GCC the pump suits services where fugitive emissions are a concern: aromatics, light hydrocarbons, solvents, acids and caustic duties, and hot oil circulation where heat and dust make seal maintenance expensive.
Information to send with your HPX-Mag RFQ
- Liquid analysis, temperature, vapour pressure and solids.
- Rated flow, differential head and suction pressure.
- Required containment shell material and secondary casing pressure.
- Instrumentation, flush plan and lubrication choice.
- Driver data and electrical area classification.
- Delivery site, standards and test requirements.
Documents and quotation
The Flowserve HPX-Mag brochure is attached on this page. Send your duty data and we will confirm availability and lead time. Seven Star LLC is an independent supplier and does not claim any official status with the manufacturer.
Datasheets & Documents
- Brochure Flowserve HPX-Mag Brochure PUBR000077 Download
Reviews (0)
About brand
Flowserve is the American flow control company for pumps, valves, mechanical seals and valve automation, known through brands such as Durco, Worthington, Byron Jackson, Valtek, Limitorque, Worcester, Logix and Argus. It was formed on 22 July 1997 by the merger of equals of Durco International and BW/IP, whose heritage reaches back to Simpson & Thompson (1790) and Byron Jackson (1872). Flowserve Corporation is headquartered in Irving, Texas, and listed on the New York Stock Exchange.
Seven Star LLC sources and supplies Flowserve pumps, seals, control valves, ball valves, actuators and positioners for process plants in Oman, working from the nameplate data and the manufacturer's documentation.
Flowserve company profile
| Formed | 22 July 1997, merger of Durco International and BW/IP |
|---|---|
| Heritage companies | Simpson & Thompson, later Worthington Simpson (1790); Byron Jackson (1872); Duriron foundry, later Durco (1912) |
| Headquarters | Irving, Texas, USA |
| Ownership | Flowserve Corporation, public company (NYSE: FLS) |
| Product families | API and ANSI process pumps, Durco and Worcester ball and plug valves, Durco TX3 triple-offset and Valtek butterfly and globe control valves, Limitorque electric actuators, Logix positioners, mechanical seals |
Milestones
- 1790: Thomas Simpson founds Simpson & Thompson, a predecessor of Worthington Simpson pumps.
- 1872: Byron Jackson is founded, a root of BW/IP.
- 1912: The Duriron foundry, later Durco, is launched.
- 1997: Durco International and BW/IP merge on 22 July to form Flowserve, listed on the NYSE as FLS.
Flowserve product families listed here
Flowserve pumps on this page are the Durco Mark 3 ANSI process pump and the ECPJ vertical sump pump built to API 610 type VS4. Sealing products are the ISC2 cartridge mechanical seal to API 682 and DuraClear barrier fluid for dual seal systems. Flowserve valves include the Valtek Mark One globe control valve, Argus floating and trunnion-mounted ball valves (EK71, FK79, FK76M) and Durco Microfinish ball valves. Automation is covered by Limitorque MX and L120 multi-turn electric actuators, the Rotadisk RD and RDF pneumatic actuator and the Logix 3800 digital positioner.
Where Flowserve equipment is used
Mark 3 pumps handle acids, caustic, solvents and utilities in chemical and petrochemical units. VS4 sump pumps drain pits and collection tanks. Valtek control valves and Argus ball valves are found in refining, gas processing, power and desalination, and Limitorque actuators operate gate and globe valves on pipelines, tank farms and water networks across the GCC.
Flowserve products we list
Ordering Flowserve parts: what we need
The serial number on the nameplate is the key to Flowserve records for a pump, valve or actuator. Please add the following by product type:
- Pumps: size and model, impeller diameter, materials, seal arrangement, and the part name and item number from the sectional drawing
- Mechanical seals: seal type and size, drawing or part number, materials code, pumped fluid and flush plan
- Valves: size, pressure class, body and trim materials, end connections, and the actuator and positioner model
- Limitorque actuators: unit size, order and serial number, supply voltage, wiring diagram number
Facts checked against Flowserve's SEC filings and published company histories, October 2026.
Browse Flowserve products by category: Control Valves, Pumps, Valve Actuator, Valve Positioner.
FAQ
Questions about the Flowserve HPX-Mag API 685 Sealless Magnetic Drive
Answers from our engineering team on installation, compatibility and integration.
01What is special about the Flowserve HPX-Mag?
It is described as the first API 685 sealless magnetic drive pump to combine secondary pressure containment with integrated solids-handling capability, based on the HPX API 610 hydraulics.
02What are the HPX-Mag operating limits?
Rated flow is up to 1,000 m³/h and head up to 300 m. Standard pressure is up to 42 bar and temperature runs from –29 to 300 °C, with higher values on request.
03What containment shell materials are available?
The shell is alloy C4 for corrosion resistance and efficiency, or ceramic ZrO2 for zero eddy-current losses. Both are self-venting and fully drainable.
04How is shell failure detected?
Instruments on the intermediate lantern signal excess pressure through a pressure sensor on the secondary casing, or liquid through a sensor at the lantern low point.
05Does the HPX-Mag need a mechanical seal?
No. It is hermetically sealed and needs no mechanical seal or external flush in normal operation; the process fluid cools the magnets and lubricates the bearings.
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