A313-01-880 Issue A
Page 2
© Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.2
Description
The HV Vacuum Booster Pumps are large direct drive mechanical booster pumps with a pumping speed up to
40000m
3
h
-1
. They are designed to operate reliably for long periods with minimal requirements for maintenance.
The pumps are intended for use in large capacity vacuum pumping systems. They must be backed by suitable backing
pump(s): they are not suitable for use without such backing pumps. You should consult with Edwards Applications
Department for further advice.
The pumps have the following features:
Standard vertical (downwards) flow
Direct drive with flange mounted motor options
Supplied with inlet strainer to prevent ingress of gross debris
Pumped oil lubrication at gear end (for operation at up to 1800 rpm maximum)
Water cooled oil boxes at both drive and gear ends
Oil box evacuation to reduce pressure differential and prolong seal life
Closed end impellers to help maintain balance
Supplied with stainless steel, water cooled, exhaust gas heat exchanger.
The pumps are only supplied in a bareshaft configuration, that is no motor is provided.
This allows the customer to provide their own motor to suit their own power requirements (within the limits defined
below), electrical supply criteria and motor supplier preference.
In addition, motor mounting kits (comprising bell housing, adaptor plates, coupling and fixings) are available to be
ordered separately. These mounting kits are available in four configurations to suit the following:
IEC configuration to suit 30 kW 400 V 3-phase 50 Hz 4-pole motor with FF350 flange
IEC configuration to suit 55 kW 400 V 3-phase 50 Hz 4-pole motor with FF500 flange
NEMA configuration to suit 40 hp 460 V 3-phase 60 Hz 4-pole motor with C flange
NEMA configuration to suit 75 hp 460 V 3-phase 60 Hz 4-pole motor with C flange
The approved motor powers are as identified in the motor mounting kits above.
Any requirement to use motors of alternative powers and/or mounting configurations to those given above must be
referred to Edwards Applications Department for further advice.
Pumps may be operated with motors which provide for either direct-on-line (DOL) or inverter drive starting, subject
to the criteria and limits shown in
, Technical Data, of this manual. Note that the HV40000 pump is only
intended for use with inverter control.
The drive end of the shaft is fitted with an inner double seal arrangement plus an outer lip seal: the space between
these is filled with oil from an externally ventilated glass oil bottle. There have been a number of seal types and sizes
fitted during the life of the pump.
The current (Mk 4) design features a smaller diameter shaft which reduces the contact speed of the seal. The earlier
Mk 2 and Mk 3 designs are supported by a common replacement seals kit which has the advantage of upgrading the
Mk 2 design to the later Mk 3 standard.
The pump has two inspection plates fitted, one near each end of the unit, which permit inspection of the rotors when
the pump is stationary.
The pump has oil sight glasses at each end which are marked to show the minimum and maximum permitted oil levels.
