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
2. Where bolted connections are made between copper or brass surfaces, the metal
surfaces shall be thoroughly cleaned and coated with a corrosion thoroughly
inhibiting compound.
3. The tightness of each bolt in each factory made bolted electrical connection shall
be checked during erection and connection of the equipment.
4. It shall be the Contractor’s responsibility to certify that the tightness of each bolt
in all bolted electrical connections, factory or field, is in accordance with the
manufacturer’s recommendations.
5. bolted electrical connections shall be tightened with manual torque wenches.
Torque wenches shall be so constructed that they will visually or audibly indicate
when the proper torque is reached. The accuracy of each torque wrench shall be
checked by a testing laboratory acceptable to the Supervising Engineer
immediately prior to its use on equipment erected under these specifications.
B. Connection Bolt Tightness Check:
1. The tightened bolts in electrical connections shall be checked at random as
selected by and in the presence of the Supervising Engineer. The Contractor
shall provide calibrated hand torque wrenches and the necessary platforms
equipment, and personnel for the random check.
2. The number of bolts checked shall be acceptable tot eh Supervising Engineer
based upon their observance of the quality and completeness of the tightening
operations. A minimum of 10 per cent of the bolts in each connection, but not
less than two bolts in each connection, shall be checked.
3. The Contractor shall be responsible for coordinating the checking of bolt
tightness so that minimum interference with equipment erection and
connection will be experienced. Removal of covers and similar dismantling of
equipment to permit the Supervising Engineer to witness the testing of bolt
tightness of enclosed connections shall be part of the work included under
these specifications.
4. Checking of tightness of electrical connections in the presence of the
Supervising Engineer is intended to assist the Contractor in avoiding the
expense of repairing costly connection failures. This check shall not relieve
the Contractor of complete responsibility for the integrity of the electrical
connections.