Regenerative Turbine Pumps

Transcription

1 Bulletin 40 October Series Regenerative Turbine Pumps Capacities to 60 GPM Heads to 800 Feet MTH PUMPS

2 Series regenerative turbine pumps represent the most economical, high performance alternative for low fl ow (to 60 GPM) applications involving moderate to high pressures (heads to 800 feet). By combining years of regenerative turbine pump designs with precision computer controlled manufacturing, the Series delivers high effi ciency pumping operation, even at low NPSH. High quality parts and an easily serviceable design provide low maintenance and long life. Water Passage Design MTH has combined seventy years of water passage design with a multistage mechanical concept to achieve maximum capacity and pressure while minimizing horsepower requirements. By optimizing the number of pumping stages with each water passageway, MTH improves both effi ciency and pressure in the Series, exceeding the standards realized by previous techniques. Impeller Profile One of the most notable improvements in regenerative turbine pump technology incorporated in Series pumps involves the ability to determine the optimum impeller width and blade length. These factors have a signifi cant effect on the required horsepower versus pressure curve for regenerative turbine pumps. By optimizing these for each Series pump, peak effi ciency is improved and off peak horsepower requirements are reduced as well. Impeller Blades After the most favorable impeller profi le has been determined for a particular water passageway crosssection, MTH calculates the number of blades needed to maximize the performance of that pump. Current blade design in Series pumps increases both effi ciency and design pressure without the manufacturing diffi culties associated with producing contoured blade impellers. State-of-the-art computer controlled machines simplify manufacturing of the various MTH impellers utilized in the Series. The result is a high performance pump providing effi ciency characteristics exceeding those of more expensive units Series Regenerative Turbine Pumps NPSH Requirements Series regenerative turbine pumps meet low net positive suction head (NPSH) requirements without effi ciency loss. This is achieved by keeping the inlet fl uid velocity low and then gently accelerating to passageway velocities. Low NPSH Requirements Series regenerative turbine pumps provide exceptionally low NPSH requirements to suit boiler feed water deaerator applications. This reduced NPSH is obtained by using a fi rst stage centrifugal Francis vane impeller with inlet fl ow paths shaped to maintain a constant fl uid velocity. This reduces entry losses to the impeller as well as maintaining pump effi ciency. A multi-vane diffuser is used in conjunction with the centrifugal impeller for balancing radial loads and extracting the maximum pressure from the fl ow produced by the fi rst stage impeller. Pressure and fl ow produced by the low NPSH inducer assures that the succeeding stages are adequately fed. STANDARD MATERIALS PART BRONZE BRONZE ALL STAINLESS ALL IRON FITTED RING BRONZE STEEL Cover Cast Iron Cast Iron Cast Iron Bronze Stainless Steel ASTM A48 ASTM A48 ASTM A48 ASTM B6 AISI 6 Seal Cup Cast Iron Cast Iron Cast Iron Bronze Stainless Steel ASTM A48 ASTM A48 ASTM A48 ASTM B6 AISI 6 Bearing Arm Cast Iron Cast Iron Cast Iron Bronze Stainless Steel ASTM A48 ASTM A48 ASTM A48 ASTM B6 AISI 6 Channel Ring Cast Iron Cast Iron Bronze Bronze Stainless Steel ASTM A48 ASTM A48 ASTM B6 ASTM B6 AISI 6 Impeller Bronze Carbon Steel Bronze Bronze W88 ASTM B6 L4 ASTM B6 ASTM B6 ASTM A494 Shaft Stainless Steel Stainless Steel Stainless Steel Stainless Steel Stainless Steel AISI 46 AISI 46 AISI 46 AISI 6 AISI 6 O Rings Buna N Buna N Buna N Buna N Viton A Seals EPR/Carbon EPR/Carbon EPR/Carbon Buna/Ceramic Viton/Ceramic Seats EPR/Ceramic EPR/Ni-Resist EPR/Ni-Resist Buna/Ceramic Viton/Ceramic Ball Bearing #04 #04 #04 #04 #04 LIMITATIONS Discharge Pressure Seal Pressure* Suction Pressure (Min) Speed Horsepower 400 PSI 00 PSI 6 Hg. Vac. 70 RPM Temperature Standard Construction -0 F Ceramic Seal Seat - Water +0 F Ni-Resist Seal Seat - Water +0 F Silicon Carbide Seal Seat +0 F & External Seal Flush * Suction Pressure Plus a Percentage of Differential Pressure

3 SERIES Design Features MTH Series regenerative turbine pumps are engineered to provide long life, lowmaintenance service for low-fl ow applications involving moderate to high pressures -- such as boiler feed and similar uses. Available in single, two, three, or four stage models, MTH pumps offer these proven design features... Steep Operating Characteristics. Near-constant capacity is maintained over wide variations in pressure. High shut-off pressure overcomes temporary line resistance. No Vapor Binding. MTH impellers are designed to handle up to 0% vapor by volume in the liquid being pumped. No Metal to Metal Contact. MTH clearances enable handling of nonlubricating fl uids while maintaining adequate heads. Low Head Requirements. MTH pumps have excellent NPSH characteristics, which makes them ideally suited for diffi cult applications. Minimum Shaft Deflection provided by heavy-duty outboard bearing supports on both sides of the impeller. 00% Tested. Every pump is fully tested to verify performance prior to shipment. Mechanical Seals incorporate EPR or Viton seals, ceramic or Ni-resist faces, and stainless steel components. These advanced seals permit elevated-temperature operation even with aggressive fl uids. Lip-Sealed #04 Ball Bearings on both inboard and outboard ends, operate within rugged cast- Optional Features Construction Materials. Bronze fi tted, all iron, bronze ring, all bronze and 6 stainless steel are available as stock materials. Mechanical Seals. Buna, EPR, Viton, Neoprene or Tefl on elastomers, Ni-resist, Tungsten, or Silicone Carbide seats and balanced or double seal arrangements are all available. Hydraulically balanced impellers iron bearing supports and are permanently lubricated for long, maintenance-free life. Replaceable Channel Rings, along with O rings at all sealing points, contribute to trouble-free operation. Non-Cavitating Series pumps may be operated under adverse inlet conditions without audible or measurable cavitation. O Ring Gaskets. Buna, EPR, Viton, Neoprene or Tefl on are all available. Seal Flush Line. External fl ush line from pump discharge to seal faces allow for higher fl uid temperature. External Water Seal Connection. Tapped openings can be provided for seal fl ushing from an external source. Replaceable channel rings Balanced Radial Loads. On multi-stage MTH pumps, radial load equalization is designed into the pump, eliminating the need for external adjustment Standard Pumps have hydraulically balanced impellers, /4 stainless steel shafts, and corrosion-resistant seals throughout. 400# Case Working Pressure. Rigid structure is designed for maximum casing strength. Large stainless shaft for minimum defl ection Lip sealed ball bearings O-ring gaskets prevent leakage Advanced design mechanical seals Water fl inger to protect ball bearings 00 Series Inducer for Low NPSH The 00 Series inducer style pumps are ideally suited to applications where available NPSH at the pump inlet is limited, such as boiler feed water deaerator service. A centrifugal impeller with low NPSH characteristics is utilized as the pump s first stage impeller, providing for the lower inlet head requirement. This first stage impeller is used in conjunction with a multi-vane diffuser to provide the NPSH required by the second stage regenerative turbine. Available NPSH as low as one foot can be effectively handled with Series pumps, depending on the pump model and capacity.

4 MTH PUMPS Regenerative Turbine Education The primary difference between a centrifugal and a regenerative turbine pump is that fl uid only travels through a centrifugal impeller once, while in a turbine, it takes many trips through the vanes. Referring to the crosssection diagram, the impeller vanes move within the fl owthrough area of the water channel passageway. Once the liquid enters the pump, it is directed into the vanes which push the fl uid forward and impart a centrifugal force outward to the impeller periphery. An orderly circulatory fl ow is therefore imposed by the impeller vane which is converted to velocity. Fluid velocity (or kinetic energy) is then available for conversion to fl ow and pressure depending on the external system s fl ow resistance as diagrammed by a system curve. It is useful to note at this point, that in order to prevent the internal loss of the pressure building capability of an MTH regenerative turbine, close internal clearances are required. In many cases, depending on the size of the pump, impeller to casing clearances may be as little as onethousandth of an inch on each side. Therefore, these pumps are suitable for use only on applications with clean fl uids and systems, or else the fl uid must be pre-fi ltered before reaching the pump. Next, as the circulatory fl ow is imposed on the fl uid and it reaches the fl uid channel periphery, it is then redirected by the specially shaped fl uid channels, around the side of the impeller, and back into the I.D. of the turbine impeller vanes, where the process begins again. This cycle occurs many times as the fl uid passes through the pump. Each trip through the vanes generates more fl uid velocity, which can then be converted into more pressure. The multiple cycles through the turbine vanes are called regeneration, hence the name regenerative turbine. The overall result of this process is a pump with pressure building capability ten or more times that of a centrifugal pump with the same impeller diameter and speed. In some competitive designs, you will fi nd that only a single-sided impeller is used. That design suffers from a thrust load in the direction of the motor that must be carried by the motor bearings. MTH turbines use a two-sided impeller design that builds pressure equally on both sides. This has the advantage of allowing the pump pressure to hydraulically self-center the impeller in the close clearance impeller cavity, while not burdening the motor bearings with excessive thrust loads SERIES Engineering Specifications Series The contractor shall furnish (and install as shown on the plans) an MTH Turboflex regenerative type pump model size of (BRONZE FITTED) (BRONZE RING) (ALL IRON) (ALL BRONZE) (6 STAINLESS STEEL) construction. Each pump shall have a capacity of GPM when operating at a total head of feet at the specifi ed temperature, viscosity, specifi c gravity, and with feet NPSHA. The maximum speed shall not exceed 70 RPM. Pump shall be of the vertically split case design with removable bearing housings and is to be furnished with mechanical seals. The channel rings shall be replaceable external type. The suction connection shall be NPT located in the top vertical position and be cast separately from the discharge. The discharge shall be NPT in the top vertical position and the pump shall be self-venting. The impeller(s) shall be located on a stainless steel shaft between sealed grease lubricated ball bearings. The impeller(s) shall be hydraulically self positioning with no external adjustment necessary. Each pump shall be tested at the specifi ed capacity and head prior to shipment. The pump shall be mounted on a steel baseplate, fl exibly coupled with aluminum guard to a phase Hertz volt RPM horizontal (DRIP-PROOF) (TOTALLY ENCLOSED) (EXPLOSION PROOF) motor. The motor is to be sized to prevent overloading at the highest head condition listed in the specifi cation Series The contractor shall furnish (and install as shown on the plans) an MTH Turboflex low NPSH inducer style regenerative type pump model size of (BRONZE FITTED) (BRONZE RING) (ALL IRON) (ALL BRONZE) (6 STAINLESS STEEL) construction. Each pump shall have a capacity of GPM when operating at a total head of feet at the specifi ed temperature, viscosity, specifi c gravity, and with feet NPSHA. The maximum speed shall not exceed 70 RPM. Pump shall be low NPSHR inducer style design with a centrifugal Francis vane design impeller and a multi-vane diffuser for balancing radial loads. Pump shall be of the vertically split case design with removable bearing housings and is to be furnished with mechanical seals. The channel rings shall be replaceable external type. The suction connection shall be NPT located in the top vertical position and be cast separately from the discharge. The discharge shall be NPT in the top vertical position and the pump shall be self-venting. The impeller(s) shall be located on a stainless steel shaft between sealed grease lubricated ball bearings. The impeller(s) shall be hydraulically self positioning with no external adjustment necessary. Each pump shall be tested at the specifi ed capacity and head prior to shipment. The pump shall be mounted on a steel baseplate, fl exibly coupled with aluminum guard to a phase Hertz volt RPM horizontal (DRIP-PROOF) (TOTALLY ENCLOSED) (EXPLOSION PROOF) motor. The motor is to be sized to prevent overloading at the highest head condition listed in the specifi cation.

5 SERIES Cold Water Selection Guide U.S. GALLONS PER MINUTE HEAD IN FEET * * * 4D. 4E. 4F. 4G. 4H.7 4I.7 4IA 8M. 8P. 0 * * 4D. 4E. 4F. 4G. 4H.7 4I 8K 8M. 8P. 8R 7 * * 4D. 4E. 4F.7 4F.7 4H 4I 4IA. 8M 8R 8R 00 * 4D. 4E. 4F.7 4F.7 4H 4I 4IA. 8K 8P 8P 8R 4D.7 4E.7 4E.7 4G 4F 4G. 4H. 4I 8K 8M 8P 8R 0 4E.7 4E.7 4D 4E 4G. 4G. 4H 4I 4IA 8M 8R 84R E 4D 4E 4F. 4G. 4H 4I 8K 4IA 8P 8P 00 4E 4D 4E 4F. 4F. 4H 4I 4IA 8K 8M 8R 7. 4D. 4D. 4E. 4F. 4G 4H 4I 4IA 4IA 8P 84P D. 4D. 4E. 4F 4G 4H 4I 4IA 44IA 8P 84R D. 4E. 4E. 4F 4H 4I 4I 4IA 8P 7. 84P D 44D 4E 44F 44H 44H 4I 44IA 84M 7. 84P D 4E 44E 44G 44H 4I 44I 44IA 84P D 4E 44E 44G 4I 44I 8K 7. 84P 0 84R 00 44D 44E 44F 4I 4I 44I 44IA Selections based on coldwater 0 4E 44E 4I 4I 44I 44IA flooded suction.0 S.G. Open Dripproof Motor. Consult individual pump curve for E 44G 4I 44I 44I 44IA final selection. *Refer to T4 Series Bulletin E E Boiler Feed Selection Guide Evap Rate GPM BOILER PRESSURE IN PSI Boiler Pump GPM.0. 4D. 4D.7 4E.0 4E. 4F. 4E.0 44E D. 4D.7 4E.0 4E. 4F. 4E.0 44E D. 4D.7 4E.0 4E. 4E. 4E.0 44E D. 4D.7 4E.0 4E. 4E. 4E.0 44E D. 4E.7 4F. 4G.0 4E. 44F.0 44I D. 4F.7 4F. 4F.0 4F.0 44I.0 44I E. 4F.7 4G.0 4G.0 4G.0 44I.0 44I F. 4I. 4I.0 4I.0 4I.0 44I.0 44I F. 4I. 4I.0 4I.0 4I.0 44I.0 44I G. 4I. 4IA.0 4I.0 4IA.0 44I.0 I I.7 4IA. 4IA.0 4I.0 4IA.0 44IA 7. I I.7 4IA. I.0 4IA.0 44IA.0 I 7. I IA.0 8K.0 K.0 I.0 6D 7. 6D 0.0 6D M. K.0 K.0 K 7. 6D 7. 6G 0.0 L M. K.0 K.0 K 7. L 0.0 6G.0 L P. L.0 L 7. L 0.0 L 0.0 6G. L R.0 L.0 6L 7. L 0.0 6G.0 6G.0 6G L.0 6G.0 6G 0.0 6G 0.0 6G.0 64G 0.0 7H G.0 6G.0 7H.0 7H.0 7J 0.0 7H 0.0 7K G.0 7K 7. 7K.0 7K.0 7K H J 0.0 NOTES Selections are for water at 00 F (Maximum) with above feet NPSHA (Net Positive Suction Head Available) over NPSHR (Net Positive Suction Head Required). All pumps are selected for intermittent (on-off) operation and with ODP (Open Drip Proof) motors operating at 70RPM. This selection is for reference only. Refer to the technical data of the specific model number to ascertain the suitability of the model in your application, or call the factory pump information is available in our Bulletin 0.

6 40 80 SERIES Dimensions /4 DIA. G INLET S DISCHARGE / / /6 T E Pump Only Dimensions PUMP SERIES INLET DISCHARGE E G S T 4 /4 NPT /4 NPT /8 /6 4 /4 6 4 /4 NPT /4 NPT /8 /6 6 /4 8 4 /4 NPT /4 NPT /8 /6 8 / /4 NPT /4 NPT /8 /6 0 /4 8 / NPT / NPT /4 /6 / 7 8 / NPT / NPT /4 /6 8 / 0 8 / NPT / NPT /4 /6 / 84 / NPT / NPT /4 /6 4 / 6 ROTATION: Clockwise when viewed from driver end. / / C L K G S 7/8 / HD D / / 7 /4 TYP. 4-7/ Ø Foundation Holes 40 Series Flex Coupled Pump Dimensions ALL 40 MODELS MODEL 4 MODEL 4 MODEL 4 MODEL 44 FRAME CPLG K D HD C S L S L S L S L 6 J /8 / 8 / 4 /4 4 6 /4 6 8 /4 8 0 /4 0 4T 4J /8 / 8 / 4 /4 4 6 /4 6 8 /4 8 0 /4 0 4T 4J /8 / 8 / 4 4 /4 4 6 /4 6 8 /4 8 0 /4 0 8T J /4 4 / 9 / 6 4 /4 6 6 /4 0 8 /4 0 /4 84T J /4 4 / 9 / /4 0 8 /4 0 /4 T 6J 7/8 /4 0 / /4 0 /4 40 T 6J 7/8 /4 0 / / Series Flex Coupled Pump Dimensions ALL 80 MODELS MODEL 8 MODEL 8 MODEL 8 MODEL 84 FRAME CPLG K D HD C S L S L S L S L 6 J /8 / 8 / / 6 8 / 8 / 0 4 / 4T 4J /8 / 8 / / 6 8 / 8 / 0 4 / 4T 4J /8 / 8 / 4 / 6 8 / 8 / 0 4 / 8T J /4 4 / 9 / 6 / 8 8 / 0 / 4 / 40 84T J /4 4 / 9 / 7 / 8 8 / 0 / 4 / 40 T 6J 7/8 /4 0 / / / 40 4 / 4 T 6J 7/8 /4 0 / / / 40 4 / 4 NOTES All dimensions in inches. May vary ± ¼ inches. Not for construction purposes unless certifi ed. ROTATION: Clockwise when viewed from driver end.

7 40 80 SERIES Dimensions /4 DIA. /4 INLET S DISCHARGE / / 6 /4 T E Pump Only Dimensions PUMP SERIES INLET DISCHARGE E S T 4 / NPT /4 NPT /8 /8 6 4 / NPT /4 NPT /8 7 /8 8 4 / NPT /4 NPT /8 9 / / NPT /4 NPT /8 /8 8 / NPT / NPT /4 6 /8 7 8 / NPT / NPT /4 9 /8 0 8 / NPT / NPT /4 /8 84 / NPT / NPT /4 /8 6 ROTATION: Clockwise when viewed from driver end. / / C L K /4 S 7/8 / HD D / / 7 /4 TYP. 4-7/ Ø Foundation Holes 40 Series Flex Coupled Pump Dimensions ALL 40 MODELS MODEL 4 MODEL 4 MODEL 4 MODEL 44 FRAME CPLG K D HD C S L S L S L S L 6 J /8 / 8 / /8 8 7 /8 0 9 /8 /8 4T 4J /8 / 8 / /8 8 7 /8 0 9 /8 /8 4T 4J /8 / 8 / 4 /8 8 7 /8 0 9 /8 /8 8T J /4 4 / 9 / 6 /8 0 7 /8 9 /8 /8 8 84T J /4 4 / 9 / 7 /8 0 7 /8 9 /8 /8 8 T 6J 7/8 /4 0 / /8 40 /8 40 T 6J 7/8 /4 0 / /8 40 / Series Flex Coupled Pump Dimensions ALL 80 MODELS MODEL 8 MODEL 8 MODEL 8 MODEL 84 FRAME CPLG K D HD C S L S L S L S L 6 J /8 / 8 / 6 /8 8 9 /8 /8 /8 8 4T 4J /8 / 8 / 6 /8 8 9 /8 /8 /8 8 4T 4J /8 / 8 / 4 6 /8 8 9 /8 /8 /8 8 8T J /4 4 / 9 / 6 6 /8 0 9 /8 /8 8 / T J /4 4 / 9 / 7 6 /8 0 9 /8 /8 8 /8 40 T 6J 7/8 /4 0 / /8 40 /8 4 T 6J 7/8 /4 0 / /8 40 /8 4 NOTES All dimensions in inches. May vary ± ¼ inches. Not for construction purposes unless certifi ed. ROTATION: Clockwise when viewed from driver end.

8 Bulletin 40 October MTH TOOL COMPANY MTH PUMPS 40 West Main Street Plano, IL Phone: Fax: