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Article II. Pumps and Pump Motors
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11.125.070 Pumps.
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The pumps shall be horizontal, centrifugal, split case, single stage with cast iron casing and enclosed double suction, bronze impellers. Pumps shall have casing and impeller wear rings. Stuffing boxes shall be of the packing type with braided graphite asbestos. Motor to pump shaft coupling shall be of the flexible type with no nonmetallic power transmitting components. Coupling shall be of the type having a flexible steel circumferential grid engaging two steel hubs or shall be of the gear type. Couplings shall have removable grease lubrication plugs and grease seals and hubs shall be keyed to their respective shafts. Bearings may be of the ball type, grease lubricated for pumps below 500 hp. For pumps 500 hp and above, split sleeve bearings and Kingsbury type thrust bearings shall be used, with water-cooling (with solenoid valve) for the thrust bearing, if necessary. The pump units shall be mounted on cast iron or structural steel frames (preferably cast iron) and shall be equipped with:

(a) Coupling safety guards;

(b) Suction and discharge pressure gauges of appropriate ranges;

(c) Drain tubing for seal leakage;

(d) Pump vent valve; and

(e) Gauge glasses for bearing oil levels (where applicable).

The seal leakage and pump vent line shall be led to the floor drains by copper piping with unions on the drain piping very near the drip pockets.

All bearings of pump units (pump and motor) 500 hp and above shall also be provided with bulb type temperature detectors and bearing temperature indicating controllers. The temperature indicating controllers shall be of the two-stage type-alarm and trip-Fenwall Series 400 or equal with a range of 50° to 200°F. Relays for the motor bearings shall be located on the motor and relays for the pump bearings shall be located near the pump. See Drawing DG-02-13 for details.

Pump units of the constant speed type are preferred, unless there is an overwhelming reason for variable speed pumps. Low speed pumps are preferred (1,200 rpm or less).

Pumps shall be performance tested in accordance with Hydraulic Institute standards and certified performance data furnished to and approved by the WSSC before shipment of pumps to the job site.

Acceptable Manufacturers: A-C Pump, Flowserve, Patterson Pump, or Peerless Pump. (28-ME-DG-02 § 6.1)