Indoor Installation; Stability; Drives; Starting Torque - Johnson Pump TG GS2-25 Instruction Manual

3.18.2.4 Indoor installation

Locate the pump so that the motor can be vented properly. Prepare the motor for operation
according to instructions provided by the motor manufacturer.
When flammable or explosive products are pumped, a proper earthing should be provided. The
components of the unit should be connected with earthing bridges to reduce the danger arising from
static electricity.
Use explosion free or explosion proof motors according to local regulations. Provide suitable
coupling guards and suitable couplings.
Excessive temperatures
Depending on the fluid being pumped, high temperatures may be reached inside and around the
pump. From 60°C onwards the responsible person must provide the necessary protective means
and place "Hot surfaces" notices.
When insulating the pump unit, ensure that adequate cooling is allowed from the bearing housing.
This is required for cooling of the bearings and grease of the bearing bracket
(see 3.18.9.7 Guarding of moving parts).
Protect the user against leakages and possible liquid streams.

3.18.2.5 Stability

Foundation
The pump unit must be installed on a base plate or on a frame placed exactly level on the foundation.
The foundation must be hard, level, flat, vibration free to guarantee correct alignment of the pump/
drive while operating. See also section 3.18.9 Guidelines for assembly and section 3.18.9.6 Shaft
coupling.
Horizontal mounting
Pumps are to be mounted horizontally on the integral feet. Other kinds of installation have an
influence on draining, filling and functioning of the mechanical seal, etc. If the pump/pump unit is
installed differently, contact your local supplier.
Support
Nevertheless the feet underneath the pump
casing make the pump very stable, an extra
support is placed under the bearing bracket.
Especially when driven by V-belt and/or a
combustion engine this extra support close to
the coupling is needed. It is designed to absorb
the belt forces and vibrations whilst letting the
pump shaft expand freely along its axis.

3.18.3 Drives

If a bare shaft pump is supplied, the user is responsible for the drive and the assembling with the
pump. The user also must provide guarding of moving parts. See also section 3.18.9 Guidelines for
assembly.

3.18.3.1 Starting torque

• The starting torque of internal gear pumps is almost identical to the nominal torque.
• Take care that the motor has a sufficiently large starting torque. Therefore choose a motor with a
capacity 25% higher than the pump power consumption.
Note! A mechanical variable speed drive requires checking of the available torque at low and high
speed.
• Frequency invertors may have limited the starting torques.
• Also verify that the maximum allowable torque at the pump shaft is not exceeded (see section
3.10.4). In critical cases a torque-limiting device such as a slip or break coupling can be
provided.
A.0500.501 – IM-TGGS/05.01 EN (03/2013) 29