Screw Pump Twin Aggregates Series SPZ/M …

1 1 Screw Pump twin AggregatesSeries SPZ/M magdrive Application For the delivery of fuel oils, hydraulic oils or other lubricating liq-uids. The fluid media must not contain any abrasive particles nor attack the pump materials chemically. Main fields of application SPZ/M - twin Aggregates operate as transfer, booster and burner operation pumps in fuel oil engineering, as transfer and filling pumps in tank farms as well as lube-oil pumps in any industrial branches. They are moreover used for pressure generation in oil-hydraulic plants of all kinds.

2 Design/Construction twin aggregate of the compact type of construction in which two Screw pumps are interconnected by way of a reversing valve casing. Pump: Self-priming three- Screw type of pump with internal bearing, without shaft sealing due to magnetic clutch. The pump is her-metically sealed due to the can of the magnetic clutch. The hardened and ground screws run in an exchangeable cas-ing insert. The driving Screw is hydraulically balanced. The end-side pump cover absorbs the axial thrust of the working screws.

3 Their drive is hydraulic. The thread flanks merely transmit the torque result-ing from the liquid friction. Thus, the thread flanks are practically stress-free and not subject to any wear. All sliding parts are lu-bricated by the delivery medium being within the range of full liq-uid friction. The radial and axial bearing of the driving Screw with pump size 20 is by the balancing piston guided in the bearing ring, with pump size 40 by a groove ball bearing. Magnetic clutch and suction chamber are interconnected by way of a return gallery.

4 Thus, the liquid circulates in the clutch cham-ber and leads away the heat, caused by eddy currents. A pump bracket with mounting foot carries out the connection pump/driving motor. Compact aggregate : Two of the described pumps are attached to a common revers-ing valve casing. Arranged in the reversing valve casing are two stop valves and two lockable non-return valves. Data on the design with filter, on the possible filter heating and on the manometers included in the scope of supply can be taken from the separate items of description.

5 Operation Pump: The three spindles build due to their special profiling of the thread flanks, an axial and continuous shifting by rotation of the spindles from the suction to the pressure side. Despite the spin-dle rotations no turbulences occur. Consistent chamber volume excludes squeezing. Compact aggregate : The operating pump primes the fluid to be pumped through the suction chamber of the reversing valve casing and, in case of the design with filter, through the filter. Passage through the ra-dial screen filter is from the outside to the inside.

6 The operating pressure building up in the pressure chamber opens the non-return valve of the operating pump closing that of the inoperative pump. This prevents the stand-by pump from turning in reverse motion. Noise/Pulsation The structural design and operation of the Screw pump twin ag-gregate ensure a very low noise level and an almost pulsation-free delivery. Performance data Capacity Q 10 I/min up to 110 I/h c Temperature of the fluid pumped t up to 150 C Inlet pressure pz up to 6 bar Pump outlet pressure pd up to 40 bar d Viscosity range v =2 up to 750 mm /s Delivery flange DNd=20 up to 25 mm c With n = 2900 1/min d For the attainable delivery pressure as a function of viscosity and speed, pleas refer to the individual characteristics.

7 The pressure data only apply to nearly static pressure load. With dynamic pressure change load, please inquire. Pressure relief valves As an overload protection, installed in each pump is a pressure relief valve, which, with all designs, is set at a response pressure approx 10% above the operating pressure. In case of different response pressures are requested, it must be indicated in the order. Series SPZ/M 2 Flanges/Connections Flanges Suction side: PN 16, DIN 2533 Delivery side: PN 40, DIN 2535 Connections SPZ/M without filter: M1, M2 Pressure gauge SPZ/M with filter: B7 Draining filter casing E7 Venting filter casing M1, M2, M3 Pressure gauge Materials Denomination Part No.

8 Material designs W 20 W 8 Pump casing 1 EN-GJL-250 EN-GJS-400-15 Casing insert 2 AlMgSi1 AlMgSi1 Pump cover driving side end side 3 4 EN-GJL-250 EN-GJL-250 EN-GJS-400-15EN-GJS-400-15 Casing cover 7 c EN-GJL-250 EN-GJS-400-15 Filter casing 9 c EN-GJL-250 EN-GJS-400-15 Bearing bush 10 AlMgSi1 AlMgSi1 Driving Screw 12 16 MnCrS5 16 MnCrS5 Working Screw 13 16 MnCrS5 16 MnCrS5 Reversing valve casing 301 EN-GJL-250 EN-GJS-400-15 Wire mesh at radial screen filter 481 c Steel galvanized Steel galvanized c For design with filter only Operating control Manometers: SPZ/M without Filter Outlet side: a manometer (included in the scope of supply).

9 A mano-vacuummeter being requested on the suc-tion side, same would have to be provided at the site. Measuring point M1 is provided for connec-tion. SPZ/M with Filter Suction side: two mano-vacuummeter Outlet side: a manometer (each of which included in the scope of supply) The mano-vacuummeters show the pressure behind the filters. Thus, the pressure loss in the filter can be determined and an inadmissible contamination realized. Change-over switchgear: Against extra charge, a reversing device is supplied for operat-ing control purposes, which, regarding its circuitry, is designed so that in case of failure of the operating pump, the stand-by pump is automatically put into operation.

10 Signal lamps indicate the respective operating conditions. Scope of supply: Change-over switchgear U1 for motors up to 3 KW (400 V oper-ating voltage) for across-the-line starting, consisting of:: 1 Steel plate casing, enclosure IP54, dimensions: width 320 mm, height 320 mm, depth: 160 mm 2 three-phase air-break contactors with overload relay 1 selector switch (PUMP 1, PUMP 2, und OFF) 2 green signal lamps Operation 1 red signal lamp Fault 1 control fuseg Connecting terminals for all incoming and outgoing lines. 2 control line terminals for connection of additional control sta-tions, if any.