Specifications

2
SECTION 3: PUMPS AND MOTORS
3.1 PUMPS
Pumps shall be electric motor driven, horizontal centrifugal with mechanical shaft seal, volute case and
impeller.
The shaft seal shall be a self-adjusting mechanical type to prevent leakage and eliminate the need for drain
piping. The volute case shall be precision machined from gray cast iron and engineered to modern hydraulic
standards. It shall be possible to rotate the discharge connection to any of four positions. A heavy cast iron
bracket shall maintain alignment between the motor and volute cast.
The impeller shall be an enclosed type and balanced to provide smooth operation. The impeller is to be keyed
to the shaft and locked with a special cap screw and washer. The motor shaft is to be manufactured from high
grade steel and of reduced length to increase shaft rigidity, extend bearing life, and reduce the overall length
of the pump and motor assembly. The motor shaft shall be protected with a replaceable stainless steel sleeve.
3.2 MOTORS
Each pump motor shall be a squirrel cage induction horizontal solid shaft type. The pump impeller shall be
direct mounted and keyed to the motor shaft with a stainless steel protective sleeve. The temperature rise of
the motor shall be to NEMA Standard MG-1- Class F insulation.
Radial and thrust bearings of ample capacity to accommodate the hydraulic thrust of the pump shall be
incorporated into the motor. The motor shall be of proper size to drive the pump at any point on it's operation
curve without exceeding the service factor nameplate rating.
SECTION 4: SKID, PIPING, VALVES, GAUGES, MECHANICAL EQUIPMENT
4.1 SKID CONSTRUCTION
Pump station skid shall be formed from a single sheet of steel. Continuous welded and smooth ground at all
corners resulting in a seamless, one piece structure with rounded edges and corners. If required, the skid shall
be strategically reinforced underneath with structural channel iron to support pumps, manifold control
enclosure and periphery. Flat steel, diamond or checker plate welded over structural steel shall not be
permitted. The skid shall be drilled and tapped for mounting of pumps, manifolds, relief valves and other
equipment. All tolerances shall permit direct bolting of pump station components to skid. The exterior of the
skid will have drilled holes for anchor bolts. There will be two holes at each corner for lifting. The skid shall be
primed and painted per enclosed specifications on both top and bottom.
4.2 FABRICATED PIPING
All fabricated piping shall conform to ASTM specifications A53 for Grade B welded or seamless pipe.
Discharge piping 6" and smaller shall be Schedule 40. All welding flanges shall be forged steel slip-on or
welding neck type. All welding fittings shall be seamless, conforming to ASTM Specification A234, with
pressure rating not less than 150 PSI.
4.3 DRAIN VALVES
Drains are to be provided from any possible low point in the system and are to consist of 1/4" brass petcocks.
They include, but are not limited to, the following:
- Drain for each pump discharge check valve
- Drain in discharge manifold