Service manual

17
E.4 PROTECTIVE DEVICES
E.4.1 General
Automatic shutdowns, emergency switches, and similar controls should be part of
pumping system. They are generally supplied by system supplier or user.
E.4.2 Covers and Guards
Before start-up, insure all protective-covers and guards are in place.
WARNING
DANGER
To protect personnel from accidental contact with rotating couplings, sheaves,
belts, shaft keys, keyways, etc., install the following covers or guards over:
• Bracket openings on flange mounted pumps.
• Couplings and shafts on foot mounted pumps.
• Sheaves, gears, chains, belts or other type drives.
E.4.3 Valves
Check all valves, especially those that are manually operated, to be sure they are in
proper position. Check that there is no possibility of starting pump with a blocked
suction or discharge line.
WARNING
Starting a pump with discharge line blocked and without adequate relief protection
will cause catastrophic pump failure and possible injury to personnel.
E.5 INTERMEDIATE DRIVE LUBRICATION
Some Imo pump units include intermediate gearboxes or other devices between pump and
driver. When these devices are present, lubrication is required. Add lubricant to specified level
per device manufacturer’s recommendations before start-up.
E.6 HEATING JACKETS
Some pumps require heating before start-up. See Section E.12 on Thermal Shock and
Operating Temperature Limits. This is usually done with steam, hot water, heat transfer fluid or
electric heat strips. Some pumps are fitted with heating jackets (sometimes called steam
jackets). Where electric heating is used, fill jacket with appropriate heat transfer fluid prior to
start-up. Unless specified otherwise, maximum permissible pressure in a heating jacket is 150
psi gage.
WARNING
Provide safeguards to prevent personnel from coming in contact with hot liquid or
other heated equipment surfaces.