Flowserve T-series Thrust Bearing Pot - Manual (Page 5)

USER INSTRUCTIONS T-SERIES THRUST BEARING POT ENGLISH 26999907 01-2013
Page 5 of 24 flowserve.com
be limited to maintenance staff only, with clear
visual warnings and indicators to those entering the
immediate area. Note: bearing housings must not
be insulated and drive motors and bearings may be
hot.
If the temperature is greater than 80 ºC (175 ºF)
or below -5 ºC (23 ºF) in a restricted zone, or
exceeds local regulations, action as above shall
be taken.
HAZARDOUS LIQUIDS
When the pump is handling hazardous liquids care
must be taken to avoid exposure to the liquid by
appropriate siting of the pump, limiting personnel
access and by operator training. If the liquid is
flammable and/or explosive, strict safety procedures
must be applied.
ENSURE CORRECT
LUBRICATION
(See section 5, Commissioning, startup, operation
and shutdown.)
1.6.4
Products used in potentially explosive
atmospheres
Measures are required to:
•
Avoid excess temperature
•
Prevent build up of explosive mixtures
•
Prevent the generation of sparks
•
Prevent leakages
•
Maintain the unit to avoid hazard
The following instructions for pump units when
installed in potentially explosive atmospheres must be
followed to help ensure explosion protection. For
ATEX, both electrical and non-electrical equipment
must meet the requirements of European Directive
94/9/EC. Always observe the regional legal Ex
requirements eg Ex electrical items outside the EU
may be required certified to other than ATEX eg
IECEx, UL.
1.6.4.1
Scope of compliance
Use equipment only in the zone for which it is
appropriate. Always check that the driver, drive
coupling assembly, seal and pump equipment are
suitably rated and/or certified for the classification of
the specific atmosphere in which they are to be
installed.
Where Flowserve has supplied only the bare shaft
pump unit, the Ex rating applies only to the pump
unit. The party responsible for assembling the ATEX
pump set shall select the coupling, driver and any
additional equipment, with the necessary CE
Certificate/ Declaration of Conformity establishing it
is suitable for the area in which it is to be installed.
The output from a variable frequency drive (VFD) can
cause additional heating affects in the motor and so,
for pumps sets with a VFD, the ATEX Certification for
the motor must state that it is covers the situation
where electrical supply is from the VFD. This particular
requirement still applies even if the VFD is in a safe
area.
1.6.4.2
Marking
An example of ATEX equipment marking is shown
below. The actual classification of the pump unit
will be engraved on the nameplate.
II 2 GD c IIC 135 ºC (T4)
Equipment Group
I = Mining
II = Non-mining
Category
2 or M2 = high level protection
3 = normal level of protection
Gas and/or dust
G = Gas
D = Dust
c = Constructional safety
(in accordance with EN13463-5)
Gas Group
IIA – Propane (typical)
IIB – Ethylene (typical)
IIC – Hydrogen (typical)
Maximum surface temperature (Temperature
Class)
(see section 1.6.4.3.)
1.6.4.3
Avoiding excessive surface
temperatures
ENSURE THE EQUIPMENT
TEMPERATURE CLASS IS SUITABLE FOR THE
HAZARD ZONE
Units have a temperature class as stated in the
ATEX Ex rating on the nameplate. These are
based on a maximum ambient of 40 ºC (104 ºF);
refer to Flowserve for higher ambient temperatures.
The surface temperature on the unit is influenced
by the temperature of the liquid handled. The