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- 74-4.02B(2)a General Reserved 74-4.02B(2)(b) Pumps
- 74-4.02B(2)(c) Ball Valves
- 74-4.02B(2)(e) Pump Controller
- 74-4.02B(2)(f) Booster Pump Enclosures
- 74-4.02B(2)(g) Pressure Gauges
74-4.02 MATERIALS74-4.02A GeneralThe concrete for the foundation and pad of the booster pump must be minor concrete. 74-4.02B Manufactured Units74-4.02B(1) GeneralThe booster pump must consist of a factory assembled and tested skid-mounted system with the following components: pump, pump controller, booster pump enclosure, manifold, inlet and outlet valves, sensors, fittings, and appurtenances. The system working pressure must be at least 150 psi. The booster pump must be listed and labeled by a NRTL.
74-4.02B(2) Components74-4.02B(2)a GeneralReserved 74-4.02B(2)(b) PumpsPumps must consist of a close-coupled pump and motor. Pumps must be (1) end suction, centrifugal type with mechanical seals, (2) coated with the manufacturer's standard finish for exterior use, and (3) single or multiple stage. Booster pumps must have a horizontal or vertical configuration. For horizontal pumps: 1. Casing must be close-grained cast iron with a replaceable bronze wearing ring 2. Impeller must be (1) dynamically balanced, (2) made from bronze, and (3) keyed and secured to the shaft by a stainless steel washer and cap screw 3. Impeller shaft must be either steel with a bronze sleeve or stainless steel with no sleeve
1. Casing must be close-grained cast iron with replaceable stainless steel wearing ring 2. Motor pedestal must be close-grained cast iron 3. Impeller must be (1) dynamically balanced, (2) made from stainless steel, and (3) keyed and secured to the shaft by a stainless steel washer and cap screw 3. The impeller shaft must be stainless steel
74-4.02B(2)(d) Butterfly ValvesButterfly valves must have a ductile iron body with molded seat liner made from EPDM or PTFE, bi-directional stainless steel stem, locking lever with extended neck, and be rated for at least 250 psi. 74-4.02B(2)(e) Pump ControllerThe pump controller must consist of an enclosure, VFD, main disconnect, circuit breakers, motor starter, motor protector, and a pressure transducer. The pump controller must keep the pump running when the flow of water fluctuates between the changing of the irrigation controller stations. The pump controller must have a potentiometer or keypad for adjusting the motor speed. The enclosure must be a NEMA Type 12 enclosure and rated for the horsepower, voltage, and phase shown. The ground bus must be bonded to the enclosure. The circuit breaker must be rated as shown. The following equipment must be on the front of the enclosure: 1. 2-way switch for automatic mode or manual mode. 2. Main disconnect. You may use the main breaker as the main disconnect if it is accessible on the front of the enclosure. 3. High-visibility pilot lights rated for 120 V(ac), with a colored plastic lens and screw caps. Include pilot lights for the following conditions: 3.1. Power on 3.2. Run 3.3. No flow The VFD must: 1. Be listed and labeled by a NRTL 2. Have 5 percent input impedance at the rated motor horsepower 3. Be mounted in the enclosure 4. Have a LCD screen with operator interface 5. Process the analog input signal from the pressure transducer and: 5.1. Determine water pressure 5.2. Set the pump motor speed 5.3. Determine "no-flow" conditions
The VFD and the 2-way switch must operate the booster pump as follows: 1. Automatic mode must start and stop the pump based on digital input signals from multiple irrigation controllers 2. Manual mode must start the pump regardless of the input signal Pressure transducer must be stainless steel, rated for at least 300 psi working pressure and send a 4 20 mA output signal to the VFD. 74-4.02B(2)(f) Booster Pump EnclosuresThe booster pump enclosure and lid must be fabricated from stainless steel or marine grade aluminum. The lid must have a continuous hinge, gas springs or equivalent lid supports, and a hasp for padlocking. Gas springs must use their entire stroke without forcing the lid beyond its fully opened position. Side louvers must have internal bronze insect screens and be mounted on each end. The enclosure must include at least 1 thermostatically controlled exhaust fan with bronze insect screens. 74-4.02B(2)(g) Pressure GaugesPressure gauges must: 1. Comply with ASME B40.100, Grade B 2. Include a 2-1/2-inch glycerin filled dial, stainless steel case and cover, reset screw, and 1/4-inch NPT bottom inlet 3. Read from 0 to 200 psi 74-4.02B(2)(h) AppurtenancesManifolds must be steel pipe or copper pipe. Steel pipe must comply with ASTM A53, Grade B. Copper pipe must comply with ASTM B88, Type K. The skid must be (1) either steel or aluminum channel with risers as necessary, and (2) all welded construction. Welding must comply with AWS D1.1 for steel construction or AWS D1.2 for aluminum construction. Fasteners, expansion anchors, nuts, bolts, and washers must be Type 316 stainless steel. Nameplates must comply with section 74-3.02F. 74-4.02B(3) FabricationFabricate the booster pump as follows: 1. Install the inlet and outlet valves inside the booster pump enclosure. 2. Use threaded or flanged fittings on the pump inlet and outlet connections. 3. Fabricate the pump so that it is removable without disassembling the manifolds. 4. Install pressure gauges in the manifolds on the suction and discharge sides of the pump. 5. Install the pressure transducer in the manifold. 6. Mount the pump controller inside the enclosure. 7. Attach the enclosure to the skid. Directory: esc esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko esc -> Escort affinity Program for Audi Club Members esc -> Preliminary entry form pistol esc -> Application form esc -> Request from Asian and Pacific Training Centre for Information and esc -> Constitution of the engineering student council university of maryland esc -> Subdisciplines of Earth Science Geology; study of the earth Download 6.74 Mb. Share with your friends:
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