PP-4600 Series Propeller Pumps

SCOPE Furnish and install ______submersible horizontal propeller pump(s). Each pump shall be equipped with _____HP, submersible electric motor connected for operation on a _____Volt, _____ Phase, 60 Hertz, _____ wire service, with 25 Ft. of _____ conductors with ______size Subcab cable. All cables shall be chlorinated polyethylene rubber jacketed. Each unit shall be fitted with _____ feet (minimum) of lifting cable of adequate strength to permit the raising and lowering of the pump.

MANUFACTURER REQUIREMENTS The pumping equipment specified herein shall be the design and fabrication of a single manufacturer which shall have sole source responsibility for said equipment.

PUMP DESIGN The pump(s) shall be capable of handling raw, screened sewage. The pump(s) shall be able to be raised and lowered and shall be easily removed for inspection or service without the need for personnel to enter the pump sump. The pump, with its appurtenances and cable, shall be capable of continuous submergence under water without loss of watertight integrity to a depth of 130 Ft.

PUMP CONSTRUCTION Each pump shall be of the integral design, close coupled, submersible type. All components of the pump, including motor shall be capable of continuous underwater operation. In addition, all components of the pump shall be capable of continuous operation completely submerged.

Major pump components shall be of ASTM 316 construction. The lubricant housing cover plate shall be of corrosion resistant plastic. All exposed nuts and bolts shall be of stainless steel.

All metal surfaces coming into contact with the pumped media, other than stainless steel, shall be protected by a factory applied powder coating of a polyester resin paint.

MOTOR The multi-pole motor shall be directly connected to the propeller (gearbox designs are not acceptable) to produce a propeller speed of _____RPM. The pump motor shall be squirrel cage, induction, shell type design, housed in an air filled, watertight chamber. The stator windings shall be insulated with moisture resistant Class H insulation rated for 180°C (356°F). The stator shall be insulated by the trickle impregnation method using Class H monomer-free polyester resin resulting in a winding fill factor of at least 95%. The motor shall be inverter duty rated in accordance with NEMA MG1, Part 31.The stator shall be heat-shrink fitted into the cast iron stator housing. The use of multiple step dip and bake-type stator insulation process is not acceptable. The use of bolts, pins or other fastening devices requiring penetration of the stator housing is not acceptable. The motor shall be designed for continuous duty, capable of sustaining a maximum of at least thirty (30) evenly spaced starts per hour. The rotor bars and short circuit rings shall be made of aluminum.

ELASTOMERS All mating surfaces where watertight sealing is required shall be machined and fitted with Nitrile rubber or optional Viton O-rings. Fitting shall be such that sealing is accomplished by metal-to- metal contact between machined surfaces. This will result in controlled compression of the O- rings without requiring a specific torque limit. No secondary sealing compounds, rectangular gaskets, elliptical O-rings, grease or other devices shall be used. PROPELLER The propeller shall be of 316 stainless steel, Factory balanced, non-clogging backward curved design. Each blade shall be laser cut and welded to the hub and tested to ensure that the propeller is properly balanced. The propeller shall be capable of handling solids, fibrous materials, heavy sludge and other matter found in normal sewage applications. The propeller shall be_____ inches in diameter and have three blades, each at a blade angle of _____ degrees.

CABLE ENTRY The cable entry housing shall be an integral part of the back plate. The cable entry shall have a double set of elastomer grommets in order to ensure a redundant system in the event of a cable entry seal failure. Single sealing systems will not be deemed acceptable. The cable entry shall be comprised of two cylindrical elastomer grommets, each flanked by washers and a ferrule designed with close tolerance fit against the cable outside diameter and the entry inside diameter. This will provide a leak proof, torque-free seal at the cable entrance. The assembly shall bear against a shoulder in the stator casing opening and be compressed by a gland nut threaded into it. Interaction between the gland nut and the ferrule should move the grommet along the cable axially instead of with a rotary motion. The junction chamber and motor compartment shall be separated by a terminal board which shall protect the motor interior from foreign material gaining access into the pump top. Connection between the threaded compressed type binding posts permanently affixed to the terminal board and thus perfectly leak proof. Epoxies, silicones, or other secondary sealing systems shall not be considered acceptable.

BEARINGS All bearings shall have a minimum L10 rated life of 100,000 Hrs. The outboard propeller bearing shall be an angular contact bearing. The motor shaft end shall be supported by two bearings. A roller bearing shall take up the radial loads while an angular contact bearing shall take up the axial loads.

THERMAL SENSORS Thermal sensors shall be used to monitor stator temperatures. The stator shall be equipped with three (3) thermal switches embedded in the end coils of the stator winding. These shall be used in conjunction with, and supplemental to, external motor overload protection, and wired to the control panel.

SHROUD ASSEMBLY The pump assembly shall incorporate a bell shaped inlet shroud, 360 degrees around the propeller.

OIL HOUSING The oil housing shall contain two compartments consisting of an inner and an outer section with four ports to connect and facilitate oil flow. In the event that the pumped media bypasses the other seal, this design will allow the outer compartment to collect the heavier (denser) fluids by means of a simple gravity process. Pumps which require propeller removal for oil change shall not be acceptable. Separate fill and drain plugs shall be provided to facilitate oil replacement.

MECHANICAL SEALS Each pump shall be provided with two sets of lapped end face type mechanical seals running in oil reservoirs for cooling and lubrication.

Models 4630, 4640:

Standard: The standard inner mechanical seal is corrosion resistant Tungsten Carbide/Aluminum Oxide. The outer seal faces are Tungsten Carbide/Tungsten Carbide. One face of the inner seal ring pair shall have spiral grooves laser etched in it, to provide a pumping action to move leakage from the stator housing back into the oil chamber. In order to avoid seal failure due to sticking, clogging, and misalignment from elements contained in the mixed media, only the seal faces of the outer seal assembly and its retaining clips shall be exposed to the mixed media. All other components shall be contained in the oil housing.

Optional: The inner mechanical seal is corrosion resistant Tungsten Carbide/Aluminum Oxide. The outer seal faces are Silicon Carbide/Silicon Carbide. One face of the inner seal ring pair shall have spiral grooves laser etched in it, to provide a pumping action to move leakage from the stator housing back into the oil chamber. In order to avoid seal failure due to sticking, clogging, and misalignment from elements contained in the mixed media, only the seal faces of the outer seal assembly and its retaining clips shall be exposed to the mixed media. All other components shall be contained in the oil housing.

Models 4650 – 4680:

Standard: The plug-in mechanical seal assembly shall contain positively driven rotary, corrosion resistant, Tungsten Carbide/Tungsten Carbide seal face rings for both the inner and outer seals. One face of the inner seal ring pair shall have spiral grooves laser etched in it, to provide a pumping action to move leakage from the stator housing back into the oil chamber. In order to avoid seal failure due to sticking, clogging, and misalignment from elements contained in the mixed media, only the seal faces of the outer seal assembly and its retaining clips shall be exposed to the mixed media. All other components shall be contained in the oil housing.

Optional: Tungsten Carbide/Tungsten Carbide seal face rings for the inner seal faces and Silicon Carbide/Silicon Carbide for the outer seal rings. One face of the inner seal ring pair shall have spiral grooves laser etched in it, to provide a pumping action to move leakage from the stator housing back into the oil chamber. In order to avoid seal failure due to sticking, clogging, and misalignment from elements contained in the mixed media, only the seal faces of the outer seal assembly and its retaining clips shall be exposed to the mixed media. All other components shall be contained in the oil housing.

SEAL SHIELD

Models 4630 – 4680:

The pump shall be equipped with a seal shield that prevents fibrous material from winding up around the shaft and outer seal. The shield shall be welded to the propeller hub and extend towards the motor. The shield shall rotate with the propeller and there shall be a radial micro-gap between the shield and oil-housing.

PUMP TEST The pump manufacturer shall perform the following inspections and tests on each pump before shipment from the factory:

a) Propeller(s), motor rating(s), and electrical connection(s) were checked for compliance to the purchase order. b) All pumps are vacuum tested to establish sealing integrity. All pumps are momentarily energized to determine correct rotation and current draw (prior to immersion). c) All pumps are run dry and/or immersed to determine correct shaft rotation, thrust direction, and power consumption. d) After immersion test(s), all pumps are inspected for lubricant seepage and/or water infiltration, insulation defect(s), and resistance (Ohms).

Inspections and tests performed shall confirm the pump(s) listed have met all established quality assurance standards set for similar materials. All pumps shall be warranted against defects in design, workmanship, and material (with validation being the warranty card(s) shipped with the product(s).

A written report stating the foregoing steps has been done and may be required with each pump at the time of shipment (upon prior notice to the fabrication of the pumps).