Base Specifications

End-Suction Pumps with Optional Tank

Furnish and install a prefabricated constant-pressure water booster module as designed and manufactured by NAMCO DIV, Dallas, Texas, or pre-approved equal. The complete system shall carry a UL-9F35 listing number for third party approval, and be capable of automatically providing a constant system pressure of _____ psi(g) while supplying a flow rate from 0 to _____ gpm, with a suction pressure of _____ psi(g) minimum, _____ psi(g) maximum. (The system shall also provide complete pump shut-down during low-flow periods, while maintaining constant system pressure). The system shall include pumps, motors, (bladder tank,) control equipment, valves, fittings, manifolds, and all required piping.

Furnish and install vertical radial split-case, cast iron bronze-fitted pumps with the capacities and characteristics as shown on the plans. Pump features to include foot-supported casing, back pull-out design for maintenance without disconnecting pumps from piping, statically and dynamically balanced impellers, and replaceable casing wear ring and shaft sleeve. Pumps shall be TACO Model CE or approved equal.

Pump 1 shall be rated for _____ gpm at _____ TDH and _____ hp

Pump 2 shall be rated for _____ gpm at _____ TDH and _____ hp

Pump 3 shall be rated for _____ gpm at _____ TDH and _____ hp

Pumps shall be driven by a _____ Volt, _____ phase, _____ Hertz, _____ rpm close-coupled motor with a NEMA JM shaft and in a (ODP) (TEFC) enclosure. Each motor shall meet NEMA standards and operate within the nameplate horsepower at any point on the pump capacity/head curve without the use of the service factor. Motors selected such that they operate in the rated motor safety factor are not acceptable.

Constant system pressure shall be maintained by a combination pressure-regulating and non-slam check valve, on each pump discharge line, with opening speed controls and pilot-operated type diaphragm. Valve body shall be ductile iron rated to 400 psi(g). The valve body shall be epoxy-lined and brass and stainless steel-trimmed. The valve shall be manufactured by the Cla-Val Company, Model 90-01ADS.

0 to _____ gpm..... Pump 1 only shall run.

_____ to _____ gpm..... Pump 1 and Pump 2 shall run concurrently.

_____ to _____ gpm..... Pump 1, Pump 2, and Pump 3 shall run concurrently.

The lead pump shall run continuously. The lag pump(s) shall be sequenced on and off by a factory-set, direct-sensing, vane type flow switch. The flow switch shall be field adjustable while in service, and all wetted parts shall be stainless steel or brass.

An Energy Saving System (ESS) shall shut-down the lead pump during low flow requirements. A factory-pre-charged, ASME code and NB stamped _____ gallon, _____ psi(g) rated tank shall be provided. Construction features shall include an air fill valve, a drain valve, and a FDA-approved, heavy-duty replaceable flexible membrane to separate air and water. No water shall come in contact with the metal walls of the tank. In addition, the tank shall be capable of 100% draw-down. The tank shall ship pre-charged to the proper design conditions. The tank shall be capable of storing a minimum of _____ gallons of usable water with the scheduled pump(s) and design conditions. The tank is to be mounted on (adjacent to) the pumping system skid. The tank shall be of the top-feed style, and shall be equipped with a ¾" air-release valve to emit air and provide air/water separation at the high point of the system.

Provide a UL-listed pressure switch, a UL-listed 'ESS' flow switch, with a time-delay relay to automatically control lead pump operation. These controls shall operate in such a way as to prevent high flow rate shut-downs and the lead pump short cycling while maximizing the amount of stored water available from the tank. The flow switch shall be full-vane type, UL/FM- approved, with visual flow-indication light and adjustable speed control.

To shut-down the lead pump, a flow switch must determine that the flow demand is less than four gpm, and a pressure switch must determine that the bladder tank is fully charged with high-pressure water. If these conditions exist concurrently, the lead pump will shut-down. If the flow rate is greater than eight gpm or the pressure in the bladder tank is below minimum pressure, the lead pump will restart.

An additional spring-loaded, non-slam silent check valve shall be provided on the lead pump discharge line upstream of the Cla-Val pressure reducing valve.

The tank-feed line size must be a minimum of 1½" f with a 1½" isolation ball valve at each pump. The tank feed line shall have a leaky check valve for slow fill and rapid discharge of the bladder tank. The fill line will connect to the pump discharge line between the two check valves. If the lead pump is alternated with any other pump, then the alternate lead pump(s) shall assume the duty of controlling the ESS and filling the bladder tank. Any system arrangement with tank-feed supply line, other than that described above, will not be allowed.

Furnish a single enclosure NEMA-1 power and control panel. Enclosure shall be steel, and furnished with an industrial-grade green enamel. It shall house all control components and include a 115 Volt control transformer with control power switch, power indicating light, combination manual/automatic 24-hour alternator, lead select switch or pushbutton for same size pumps, visual and audible alarm system with silencer, and other necessary controls. Include a lockable disconnect switch with external operating handle, fuses, a magnetic starter with 3-leg overload protection, pump-running lights, and multiple-position mode selector switch for each pump. Keypad H-O-A switches alone are not acceptable.

All control functions shall be by programmable logic controller (PLC). The PLC shall be control-voltage powered, using control voltage for each of its ten (10) inputs and eight (8) relay outputs, each capable of making and breaking a 7 Amp inductive load. The PLC shall contain a

resident EEPROM. Battery backup shall not be required. All adjustable functions shall be stored for display on a four-line, 20-character-per-line display module. The PLC shall be capable of multi-level password protection. A built-in communications port shall operate at 9600 baud. Terminal strips for control power, and all input and output connections shall be removable.

All of the above shall be factory pre-wired and tested in accordance with the provisions of the National Electrical Code (NEC). All control wires shall be individually numbered, and each component shall be labeled accordingly. All internal wiring shall be copper stranded, A.W.G., with a minimum insulation of 90EC. The complete assembly shall have the UL-508 listing mark for industrial control panels. UL listing of components only is unacceptable.

Include individual pressure gauges, with a minimum 3½" dial and ASA Grade 'A' stainless steel cases, for indicating the pressure at each pump, system and suction pressures, and ESS tank pressure, if specified. Pressure switches shall be provided for low-system and low-suction pressures. The low-system pressure switch with manual reset will start the back-up pumps and sound the alarm after one minute of low-system pressure. The low-suction pressure switch shall automatically reset and will shut down the system and sound the alarm when low suction pressure is detected. On the occurrence of low suction pressure, the system will remain off for a minimum of three minutes as controlled by an adjustable timer. All pressure gauges, shall be mounted above the control panel, utilizing brass ball valves for isolation purposes, and the pressure switches shall be mounted on the back of the control panel. A pump temperature protection system shall be provided. Water from each pump shall be tested for a temperature greater than 110EF. If this temperature is exceeded, a non-electric thermal purge valve will open to cool the pumps, and then close. For system pressure over 140 psi(g), an adjustable electric thermostat and solenoid valve shall be used.

The control panel shall carry a UL-508 listing. The motor/pump shall carry a UL-778 listing and the complete system shall carry a UL-9F35 number for third party approval.

The entire booster module shall be factory prefabricated, on a common structural-steel skid with all interconnecting piping and wiring completed and operationally tested to design flow and pressure conditions prior to shipment. The complete package shall include isolation valves on the suction and discharge of each pump. Valves 2½" and larger shall be lug-type butterfly valves, and valves 2" and smaller shall be full-ported ball valves. The suction branches shall be a minimum of one pipe diameter larger than the suction connection of the pump. The manifold branches shall be T-pulled and assembled so no pipe will protrude into the header. The branches shall be v-notched to fit the contour of the header. For copper pipe, the joint filler shall have a minimum of fifteen percent (15%) silver content. For stainless steel, all joints shall be TIG welded with argon-shield gas. Stainless steel stick welding shall not be permitted. Except for the base-bid manufacturer, all other bidders shall provide a copy of their Quality Assurance manual stating Welding Procedure Specification (WPS), ASME GMAW/FCAW #200, NA P1-GTAW #300, NA P-8 GTAW #100, SMAW D1.1 #500. This information shall be submitted prior to bidding this particular project and resubmitted for each project.

The pipe material shall be type L copper(schedule 10 304/316 stainless steel)(hot-dipped galvanized carbon steel). The pressure-sensing tubing shall be Imperial Eastman high-pressure nylon tubing with a minimum burst pressure rating of 1000 psi(g). All the controls and gauge taps shall be isolated by brass ball valves rated 600 psi(g) WOG pressure. The only field connections required will be at the suction and discharge headers, any drains, and the power connection(s) at the control panel.

The factory shall certify in writing that the water-pressure booster module and its component parts have undergone a complete flow and hydraulic test prior to shipment. The test shall include an operating flow test from 0 to 100% design flow rate under the specified suction and net system pressure conditions. The certification shall include copies of the test data. The system test may be witnessed by the owner, architect, or consulting engineer.

The internal pumping assemblies and pressure regulating valves shall be guaranteed for one year from date of shipment against defective material and workmanship. The motors shall also be guaranteed for one year from the date of shipment against 'burn-out' from any cause when equipped with an over-temperature protection system and maintained according to factory instructions. The water-pressure booster module as a whole shall be guaranteed in writing by the manufacturer for a period of one year from the date of shipment against defects in design, materials, or construction.

The service of a factory-trained representative shall be made available on the project site to check installation, perform start-up, and instruct the operator(s).