Centrifugal with volute pump PRMW

oildiathermic oilmagnetic-drive

Description
The type PRMW is a single-stage volute casing pump in process design with magnetic coupling according to API 685 for thermal oil applications.

Coupling and sealing
The pump features a permanent magnet coupling; the containment shell hermetically seals the pumped fluid from the outside. There is no internal circulation. The sliding bearing and a throttle section prevent exchange of contaminated product with the clean medium in the magnet cavity. For higher eddy current losses, an additional cooling circuit is required. The pump is not self-venting and must be vented with an open suction slide via a venting device.

Design and bearings
The bearing housing with cast ribs is designed as a cooling element, so temperatures in the gap-pot area remain significantly below the flow temperature in the volute casing. The volute has sturdy cast-on supports for a center-axle suspension and a welded and flanged drain and vent. The pump shaft is supported in SiC plain bearings; the drive shaft is mounted in oil-lubricated roller bearings.

Applications

• oil & gas
• chemistry
• petrochemistry
• offshore
• ship technology / marine
• refueling equipment & aviation
• industrial heating systems / heat carrier
• tank storages / tank farms
• renewable energy / environmental engineering

Characteristics / technical specifications

• Type: PRMW
• Single-stage volute casing pump with magnetic coupling for thermal oil applications
• Q max: 1400 m³/h [6160 g.p.m.] (depending on size and speed)
• H max: 250 m [820 ft] (depending on size and speed)
• Operating pressure: 40 bar [580 psi] (*higher pressures on request)
• Temperature: 450° C [840° F] (*higher temperatures on request)
• Max rotational speed: 3500 min−1
• Gasket / mechanical seal: magnetic coupling
• Installation: horizontal
• Self-priming: no
• Bearing: rolling bearing (drive); product-side plain bearing (SiC plain bearings for pump shaft)
• Lubrication: oil (drive shaft roller bearings)
• Materials: duplex, Ni-based alloys, spheroidal graphite iron / cast steel, austenitic steel
• Design standard (magnetic coupling): API 685
• Standards: API 682
• Explosion protection: category 2 / zone 1
• Note: * higher pressures and temperatures on request; ** dependent on size and speed