Wright Flow Technologies Revolution R0150X - Risk Assessment Relating to the Use of Wright Flow Technologies Revolution Pumps and Pump Units in Potentially Explosive Atmospheres

Page 7
1.1 Risk assessment relating to the use of Wright Flow Technologies Revolution 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 1.0/3.4.1 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 1.0/6.3 /
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 Chapter
5.0. Service plan. Seals must never
run dry.
Auxiliary system for shaft
sealing
Pump liquid leakage. Build
up of explosive gas.
Rare
Selection of auxiliary seal system
must be suitable for application.
Seals must never run dry.
Rotation direction test Excess temperature
Very Rare
If flushed seals are installed ensure
that flush is applied to seal
assemblies. 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.