Viking Pump TSM275: AL-05 - Manual (Page 6)

Page 6
1.1 Risk assessment relating to the use of Johnson Pump (UK) Ltd.
Acculobe rotary lobe pumps and pump units in potentially explosive
atmospheres.
Source Of Hazards Potential Hazards Frequency Of
Hazards
Recommended Measures
Unvented cavities Build up of explosive gas Very Rare
Ensure that pump is totally filled.
Consider mounting ports vertically.
See Chapter 1.0
Rotorcase / Rotors / Front
Cover
Unintended mechanical
contact
Rare
Ensure that operating pressures are
not exceeded. Ensure that suffcient
NPSH to prevent cavitation. See
Chapter 1.0/3.1 Service plan.
Pump external surfaces
excess temperature.
Electrostatic charging
Rare
User must ensure temperature limits.
Do not overfill gearboxes with
lubricant. Provide a ground contact
for pump. See Chapter 1.0 / Service
plan.
Cover 'O' ring
Pump liquid leakage. Build
up of explosive gas.
Very Rare
Check selection of elastomers are
suitable for application. Ensure cover
retaining nuts are tight. Service plan.
Pump casing / cover
Pump liquid leakage. Build
up of explosive gas.
Very Rare Stainless steel, Corrosion resistant.
Shaft seals
excess temperature.
Unintended mechanical
contact.
Leakage.
Build up of explosive gas.
Rare
Selection of seal system must be
suitable for application. See
Chapter1.0 / 4.0 . Service plan.
Auxiliary system for shaft
sealing
Pump liquid leakage. Build
up of explosive gas.
Rare
Selection of auxiliary seal system
must be suitable for application.
Rotation direction test Excess temperature Very Rare
If flushed seals are installed ensure
that flush is applied to seal
assemblys. Only allow pump to run
for minimum period - just a few
seconds.
Closed valve condition
Excess Temperature.
Excess Pressure.
Mechanical contact.
Rare
Can cause excessive pressue, heat
and mechanical contact. See
Chapter 1.0
Shaft Random induced current Very Rare
Provide a ground contact for pump.
See Chapter 1.0.
Mechanical shaft coupling
(Torque Protection)
Temperature from friction
Sparks from break up of
shear pins.
Electrostatic charging
Rare
Coupling selection must suit
application. See Chapter 1.0.
Mechanical shaft coupling
(standard)
Break up of spider.
Unintended mechanical
contact.
Electrostatic charging
Rare
Coupling selection must suit
application. Service plan. See
Chapter 1.0.
Note:- For a feature to be suitable for an application, The feature must be fit for its
designated purpose and also suitable for the environment where it is to be installed.