Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
6. Exhaust System
a) Exhaust pipes shall be of Schedule 40 black for easy steel
and of adequate size to ensure that back pressure does not
exceed the value specified by the manufacturer.
b) The exhaust pipe shall be connected through airtight
flexible coupling to the engine.
c) Exhaust pipes shall be adequately lagged with 75 mm thick
(minimum) rock wool covered with aluminum sheaths so
that to take care of exhaust gas temperature in pipes
exceeding 500 Deg. C. When exhaust pipes pass through
walls or roof a suitable weatherproof sleeve or thimble
shall be provided to isolate exhaust pipe from the building.
A silencer of heavy-duty residential type shall be provided
in the exhaust system and it shall also be lagged. Civil
contractor will carry out the operation of casting the sleeves
in the concrete, if required.
d) Exhaust pipes and silencers shall be supported from the
ceiling by special vibration isolating hangers and the pipe
shall be slanted away from the engine and a condensate trap
fitted at the lowest points. Approved rain caps shall be
installed at the discharge end of the exhaust pipes on the
roof.
e) Suitable flexible expansion joints shall be provided along
the pipe run to take care expansion requirements.
7. Filters
Cleanable/replaceable elements should be provided.
a. Fuel Oil System
The system shall have the following filters fitted before the
fuel injection pumps:
A fuel filter system of ample capacity to prevent all
particles of 3 microns size or smaller shall be
provided
b. Lubricating Oil System
i) This system should have full flow filters of sufficient
capacity.
ii) Tenderers shall give full particulars of the filters used. It
shall be mentioned in if filter elements are cleanable for
replaceable, in which case, the working hours after which