VIKING BUILT DOUBLE PUMPS

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Duane Mervin Smith
7 years ago
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1 Like getting two pumps in one! SP-1470-C VIKING BUILT DOUBLE PUMPS Viking double pumps are ideally suited to many applications in the industrial and mobile markets. Two independent pumping units are operated from a single power source to reduce equipment costs and simplify installation. System flexibility is maintained as each pumping unit can be operated at a different pressure without affecting the other. A total of 96 different double pump combinations are available to match your requirements. A special version of the double pump has an integral hi-lo circuit. This arrangement has the advantage of providing a fast cycle time and at the same time reduces the HP required by unloading the high volume pump when it is not needed. A double pump with an integral hi-lo circuit basically consists of a high volume and low volume set of pumping elements, a built-in unloading valve and a built-in check valve. The hydraulic circuit is arranged to provide rapid advance, feed and rapid return. The total volume from both sets of pumping elements is delivered until the work load is contacted. At this point, system pressure increases causing the unloading valve to function. Flow from the high volume set of pumping elements is directed back to the suction side of the pump at minimum pressure. The low volume set of pumping elements continues to deliver flow for the high pressure feed part of the operation. Both sets of pumping elements deliver flow on the return stroke. VIKING PUMP

2 SPECIFICATIONS PUMP SECTION NOMINAL 1750 RPM DISPLACEMENT MAXIMUM SPEED GPM L/MIN IN³/REV CM³/REV RPM R/MIN * Note: Ductile iron construction and combinations of the 04 and 05 pump sections are available, consult factory. DOUBLE PUMP MODEL NUMBERING CODE GP E 0 - B EXTERNAL GEAR PUMP PRINCIPLE GEAR O.D. *FIRST PUMP CAPACITY (SMALLER) *SECOND PUMP CAPACITY (LARGER) DRIVE EQUIPMENT B = FOOT MOUNTED BRACKET D = BASE MOUNTED DIRECT DRIVE M = C-FLANGE MOTOR DRIVE M4 = FOUR-BOLT MOTOR DRIVE DESIGN SERIES G = HEAVY DUTY H = HEAVY-DUTY WITH HI-LO CIRCUIT * FOR TOTAL PUMP CAPACITY ADD THE GPM RATING OF EACH SECTION: (1825 = for TOTAL of GPM) COUNTERCLOCKWISE ROTATION NOT AVAILABLE FOR DESIGN SERIES C SHAFT ROTATION (VIEWED FROM SHAFT END) O = CLOCKWISE 1 = COUNTER CLOCKWISE 2

3 PUMP SELECTION FIGURE 3 To determine whether a pump is rated for continuous or intermittent duty, use Figures 2, 3 and/or 4 to arrive at the number of units for each pumping section. These values should be based on the maximum pressure expected from each pumping section during simultaneous operations. Add the units for each pumping section together. Use this total number of units and Figure 1 to arrive at a service cycle rating EXAMPLE: GP with the 25 section at 1500 PSIG and the 10 section at 200 PSIG. Figure 3 shows the 25 section yields 88 units and the 10 section yields 50 units, a total of 138 units. Figure 1 shows that the pump is rated for continuous duty. UNITS FIGURE 1 SERVICE CYCLE TOTAL UNITS Continuous Intermittent 150 Maximum GP-04 and GP Maximum GP Maximum GP-04 and GP Maximum GP FIGURE FIGURE UNITS UNITS The solid portion of each pump section line indicates the continuous operation parameters of that pump section. The dashed portion indicates the intermittent parameters. 3

4 HORSEPOWER REQUIREMENTS Figures 5, 6, 7, 8, 9 and 10 relate required horsepower to discharge pressure for each pump section. Total horsepower required for the double pump is found by adding the requirements for each pump section. EXAMPLE: Using the pump from the first example (page 3) operating at 1750 RPM (Figure 7), the 25 section yields a horsepower requirement of 1.1 and the 10 section yields a requirement of 0.6. Total horsepower required is 1.7. FIGURE 5 FIGURE RPM RPM FIGURE 7 FIGURE RPM RPM

5 FIGURE 9 FIGURE RPM 1750 RPM GENERAL INFORMATION STANDARD CONSTRUCTION Quality materials and precision manufacturing are used in every pump with the following materials as standard: Head, Casing and Bracket cast iron Gears Heat-treated steel (GP-04 and GP-07) Heat-treated powder metal (GP-05) Shafts Case hardened steel Bearings Anti-friction, needle O-Rings and Lip Seal Buna-N For variations of the above construction, consult the factory for price and delivery. ROTATION The double pumps are directional, and rotational information (viewed from shaft end) is essential. If rotation information is omitted from an order, the pump will be furnished with clockwise rotation. A bi-directional rotation feature is available as an option. DISCHARGE PRESSURE The hydraulic gear pumps are especially designed for operating many types of hydraulic equipment which require pressures up to 2500 PSI with intermittent service. INLET PRESSURE Sizing the inlet piping so the fluid velocity is less than 5 ft./sec. will insure satisfactory operation of the pump. Positive inlet pressure is limited to 15 PSI maximum. TEMPERATURE RANGE The Viking hydraulic gear pump will function properly up to a maximum of 225 F. The recommended operating temperature for hydraulic service is between 50 and 150 F. HYDRAULIC OIL The best performance can be obtained by utilizing an industrial grade hydraulic oil. Operating viscosity should be between 100 and 300 SSU. Temperature should not exceed 150 F. for optimum life of the hydraulic oil. PUMP LIFE Pump life is a factor of many parameters, mainly pressure, speed and duty cycle. Temperature, contamination and type of hydraulic oil also have a definite effect. For actual life expectancy, consult the factory with specific conditions. FILTER To extend maximum pump life and insure the highest pump operating efficiency, keep the system clean and free of contaminating elements. On a hydraulic system it is recommended that a return line filter be installed having a maximum of 10 micron rating. FACTORY TESTING Every pump is performance tested. In addition, each pump is backed by a full factory warranty. OPTIONAL CONSTRUCTION FEATURES Contact our sales department for recommendations and special construction features available. In addition to the model number, all options must be specified in writing on the order. APPLICATION INFORMATION To assist us in supplying a pump which will provide optimum service, the following information should be furnished: capacity needed, discharge pressure, inlet conditions, name of fluid, viscosity and operating temperature. 5

6 PUMP DIMENSIONS, Series GP-04, GP-05 Pump Model Overall Length (L) GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP HEAVY-DUTY DOUBLE PUMP SEPARATE SUCTION & DISCHARGE PORTS COMMON SUCTION, SEPARATE DISCHARGE PORTS SEPARATE SUCTION, COMMON DISCHARGE PORT STANDARD OPTIONAL OPTIONAL HEAVY-DUTY DOUBLE PUMP WITH HI-LO CIRCUIT WHEN OPERATING 10 OR 14 SECTION PUMPS ABOVE 1800 RPM OR HANDLING LIQUIDS WITH VISCOSITIES ABOVE 300 SSU, CONSULT FACTORY FOR PORT RECOMMENDATIONS. * ½ NPT SUCTION PORT IS STANDARD ON ALL PUMP MODELS EXCEPT THOSE WITH A 14 SECOND SECTION (GP-05xx14-CO). THEN ¾ NPT PORT IS STANDARD. 6

7 PUMP DIMENSIONS, Series GP-07 Pump Model/Size Overall Length (L) Port Locations A B C GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP GP HEAVY-DUTY DOUBLE PUMP SEPARATE SUCTION & DISCHARGE PORTS COMMON SUCTION, SEPARATE DISCHARGE PORTS SEPARATE SUCTION, COMMON DISCHARGE PORT STANDARD OPTIONAL OPTIONAL HEAVY-DUTY DOUBLE PUMP WITH HI-LO CIRCUIT WHEN OPERATING 11 OR 16 SECTION PUMPS ABOVE 1800 RPM OR HANDLING LIQUIDS WITH VISCOSITIES ABOVE 300 SSU, CONSULT FACTORY FOR PORT RECOMMENDATIONS. 7

8 MOUNTING OPTIONS Viking Double and Hi-Lo Double pumps offer efficient gear set combinations allowing maximum pressure with minimum horsepower. Hi-Lo Double pumps include a highly-efficient sequencing valve and a heat-treated guided poppet check valve. GP-05 B DRIVE FOOT-BRACKET MOUNTED A sturdy cast iron bracket, cast and machined by Viking, assures accurate fit with the pump. Mountings are available for all sizes of Double and Hi-Lo Double pumps. GP-07 B DRIVE FOUR-BOLT MOTOR MOUNTED UNIT Integral pump and motor units help reduce on-site assembly costs and provide maximum compactness where space is at a premium. The 4-bolt mounting can be provided with AC or DC motors. Available for Series GP-04 and GP-05 only. GP-04 & GP-05 M4 DRIVE C-FLANGE MOTOR MOUNTED UNIT Viking Double and Hi-Lo Double pumps in combination with the Nema C flange bracket and flexible coupling provide an easily assembled, compact unit. The cast iron adapter bracket is accurately machined for precise shaft alignment. GP-07 M DRIVE Rev. 5/05 8

BSM MOTOR DRIVEN CENTRIFUGAL PUMPS

BSM MOTOR DRIVEN CENTRIFUGAL PUMPS PRINCIPLE OF OPERATION A hydraulically and dynamically balanced impeller with raised vane sections discharges liquid as a result of the centrifugal force developed in rotation. The head developed is entirely