•
Mechanical binding or rubbing of rotating element.
•
Pumpage specific gravity and/or viscosity too high
WARNING:
•
Do not operate pump below minimum rated flows or with suction and/or discharge valve
closed. These conditions may create an explosive hazard due to vaporization of pumpage
and can quickly lead to pump failure and physical injury.
•
Operation of this pump with both suction and discharge valves closed for even brief peri-
ods of time is an unacceptable and dangerous practice. it can rapidly lead to a violent
pump failure.
WARNING:
•
This unit must never be used without prior installation of the safety guards for rotating
parts as prescribed by O.S.H.A.
•
Inspection intervals should be shortened appropriately if the pumpage is abrasive and/or
corrosive, or if the environment is classified as potentially explosive.
•
DO NOT apply heat to hub or nose of threaded impeller. There is a danger of explosion.
•
When pumping fluids with conductivity less than 1000 ps/m follow IEC TS 60079 32-1
guidelines.
•
The preventive maintenance section must be adhered to in order to keep the applicable
ATEX classification of the equipment. Failure to follow these procedures will void the
ATEX classification for the equipment. Bearing replacement intervals are given in the spe-
cific pump model IOM.
•
Do not insulate or allow the bearing housings to accumulate a dust layer as this can result
in excess heat generation, sparks and premature failure.
•
Do not apply additional paint or coatings to the pump when in an ATEX environment.
Static electric discharge can be initiated when contacting or rubbing surfaces with exces-
sive coating thickness.
•
Potential electrostatic charging hazard. Do not rub, clean, or blast equipment with dry
cloth or dry media.
•
Stray electrical currents may ignite explosive atmospheres. Ensure drives are certified for
variable frequency drive operation by the manufacturer.
•
User shall observe necessity of using a safety device, such as a flame arrestor, to prevent
flame entering or leaving the pump sump, tank, or barrel when applicable.
CAUTION:
•
Always vary capacity with regulating valve in the discharge line. NEVER throttle flow from
the suction side
•
Driver may overload if the pumpage specific gravity (density) is greater than originally as-
sumed, or the rated flow rate is exceeded
•
Always operate the pump at or near the rated conditions to prevent damage resulting
form cavitation or recirculation
•
Damage occurs from:
•
Increased vibration levels – affects bearings, stuffing box or seal chamber and me-
chanical seal
•
Increased radial loads – Stresses on shaft and bearings
•
Heat build up–Vaporization causing rotating parts to score or seize
4.5 Locating problems
Model JC Installation, Operation and Maintenance Instructions
25
