Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Vertical Turbine Submersible Pumping Units
Ward County North Well Field
continuous insulation of PE2+PE that will provide electrical and
mechanical protection.
8) Rotor laminations shall be keyed to the motor shaft.
9) Motor shaft shall have an additional chromium surface placed at
radial bearing interfaces to reduce friction loss and enhance
lubrication.
10) Balance all rotating parts in accordance with API 841 and submit
results with equipment submittal.
11) Substitutions permitted with approval of the Engineer.
6. The maximum motor diameter and the minimum inside diameter of the well shall
be in such relationship that under any operating condition the water velocity past
the motor shall not exceed 10 feet per second (ft/s) nor be less than 0.5 ft/s or
minimum required by manufacturer for proper cooling.
7. Provide motor with a stainless steel shroud to achieve a 0.5 ft/s flow past the
motor.
H. The Contractor shall supply, in addition to the pump unit, a power cable assembly of not
less than the rating indicated and of appropriate size and construction to meet the service
intended. The power cable assembly shall be furnished in the proper length to extend
from the motor terminals to the terminal points at the motor control center. The power
cable assembly design shall include a sealing terminal plug arrangement or other
approved method, subject to Engineer’s review and approval with metal guards for
protection against rubbing the inside of the casing during installation. Any approved
cable splice is to be Hy-Pot tested underwater (at pressure) at the factory by the
pump/motor supplier and the splice corrected if found defective. Furnish test results to
Engineer, no exceptions. Failure to provide test results shall be grounds for rejection.
I. Contractor shall provide stainless steel cable supports that saddle the cable, reducing the
possibility of pinching or otherwise damaging the cable. Cable saddles and 1-inch bands
shall be premanufactured stainless steel bands with shoulders fabricated for flat cable or
semicircle for round cable. 304 stainless cable saddles and bands shall be as supplied by
Paige Electric Co. or equal. Optional methods of supporting the cable will be considered
subject to Engineer review and approval. Cable clamps and saddles shall be placed every
20 feet, maximum.
J. All cable fittings, terminals, and approved splices shall be watertight at the pressure
encountered in use.
K. The cable shall be based on three (3) conductors of stranded copper. Each conductor shall
have crossed-linked polyethylene insulation. Cable is also to include an integral ground
lead of appropriate size. The power cable is to include an overall nitrile rubber jacket.
Other submersible cables will be considered on a case by case basis subject to Engineer
review and approval. In no case will fillers be allowed.
L. The cable size shall be determined by the manufacturer with the overall wire to water
efficiency in mind. The complete power cable assembly shall be Hy-Pot tested to twice
rated voltage plus 1,000 V. In addition, any splices shall be submerged underwater when
tested at the rated voltage. Power cable shall be sized to provide for no more than a 3%
January 2012
Submersible Vertical Turbine Pumping Units
Revision 0 11210 - 9