OM−05813JW SERIES
PAGE 1 − 1INTRODUCTION
SECTION 1 − INTRODUCTION
Gorman-Rupp JW Series submersible and dry well
pumps are suitable for use in either dry or wet well si-
tuations, provided that the appropriate method of
motor cooling is selected. The motors are supplied
by EMOD Motoren GmbH, and a copy of their Oper-
ating Instructions is included with this manual.
Read this manual in conjunction with the
included copy of the Emod Motor
instructions.
The motors are fully submersible, rated IP68 for
depths up to 30m and, if fully submerged, may be
cooled by direct contact with the pumped liquid. If
only partially submerged, or in a dry well, they must
be fitted with a cooling water jacket which is internally
connected to the pumped liquid.
Liquid temperature must not exceed 40_C
to ensure adequate cooling of the motor.
The motors are normally air-filled, but for situations
where a water jacket is not suitable (e.g. handling
sludge or fatty liquids), oil-filled versions are avail-
able. The greater heat conductivity of the oil means
that such motors can be used without a water jacket,
even in partially submerged situations.
Oil-filled motors are not suitable for dry-well applica-
tions.
The different types of motors and their methods of
cooling are indicated by the type number on the mo-
tor nameplate:
TMU indicates a motor suitable for safe areas only.
EEx d DPM indicates a motor suitable for Zone 1 or
Zone 2 hazardous areas (see below).
The suffix WK indicates a water jacket.
The suffix O indicates an oil-filled motor.
To avoid leakage of the pumped liquid into the motor,
the shaft is provided with two mechanical seals with a
seal oil chamber between them. There is a moisture-
detection probe in the seal oil chamber which, in con-
junction with the appropriate control equipment, will
indicate if water has leaked past the outer mechani-
cal seal and into the chamber. This gives advance
warning of the need to change a seal before water
has penetrated the motor.
Note that the oil used inside the seal chamber is dif-
ferent from that in the motor (if used) but, as there is
no drain plug on the motor housing, there is no dan-
ger of mixing the two oils or of inadvertently draining
the oil from the motor.
Many wet-well applications are classed as hazard-
ous areas as defined by BS EN 50014. For such ap-
plications, it is mandatory to use equipment which
complies with the requirements of the ATEX Directive
94/9/EG. Pumps and motors suitable for use in haz-
ardous areas Zones 1 and 2 are marked as such on
the nameplates, as shown in Figure 2 in this section.
The ATEX marking on the pump nameplate is II 2 G
T3, which indicates that it is Category 2 of Equipment
Group II, suitable for gaseous atmospheres, and
having a maximum surface temperature of class T3
(200°C). Such marking shows that the equipment is
suitable for Zone 1 and Zone 2.
It is not necessary to have Group II Category 2 equip-
ment independently certified, but it is required that
the Construction File justifying such categorisation is
deposited with a Notified Body". The Construction
File for Gorman-Rupp submersible pumps is depos-
ited with BASEEFA (2001) Ltd, Rockhead Business
Park, Staden Lane, Buxton, Derbyshire, SK17 9RZ,
UK.
A risk assessment has been carried out in
order to comply with the ATEX directive.
This indicates that, if the pump is allowed
to run dry, there is a risk of accumulation
of flammable gases. There is also a risk of
ignition due to contact of moving parts or
to an electrical spark from the moisture
