- Email: [email protected]
Focus on gear pumps
S PECIAL -
FEATURE
Focus on gear pumps ZWs montb seestbe first of wbat will of the rotor in relation to the pump cover can be hopefully become a regular series: a increased or decreased according to the viscosity troublesbooting guide to pump selec- of the medium. tion, installation and operation. Lev Nelik, porn Roper Pumps, is our first External External gear pumps are basically comprised of contributor. Tbereafler as usual, we two intermeshing gears of the same diameter and explore tbe product portfolios from form, mounted on separate spindles and housed some tbe world’s leading manufactur- in a close fitting casing. Inlet and outlet ports are ers. If you’re in tbe market for a gear formed in the sides of the casing, in line with the pump, tbis sbould be a fine place to point of meshing. As the teeth intermesh on the start. Firstly, tbougb, a quick run inlet side, the volume on that side is reduced by tbtvugb tbe basicgear pump principles the volume of two tooth spaces, creating a suction effect. Oil is carried round to the delivery side in in lesstban 250 words.. . the pockets between adjacent teeth, and displaced under pressure through the delivery port.
Operating
principles B
Internal As the pump rotates, the rotor with internal gearing A (see diagram) drives the idler B inside an enclosed casing.The idler pin on which the idler B rotates is located eccentrically in relation to the rotorA.When the rotor starts rotating in the direction indicated, the rotor and idler gears unmesh. The chamber C between these gears is now filled with liquid. At D the teeth mesh again, thus forcing the liquid through the discharge pipe.This produces a non-pulsating liquid flow, whose capacity is determined by the speed.The wall of the pump casing and the crescent-shaped partition E separating rotor and idler act as a seal between suction and discharge side.The axial play
m 0
Internal gear pump operation (courtesy J P Pumps).
Gear Pumps - Quick Tips and Guidelines Flow approximation
Gear pumps belong to a family of positive displacement pumps, transferring constant amount of flow with each revolution (constant gpr - gallons per revolution). Many manufacturers utilize the gpr characteristic to designate their pump models, proving a quick convenient tip to approximately determine the pump flow based on its ‘pmFor example, a Roper Pump model 3622 implies a 3600~series pump with 0.22 gpr, and a 3617 pump would deliver 0.17 x 600 = 102 gpm at 600 rpm. Similarly, an ROC-03 stainless pump for chemical applications would deliver 0.003 x 1800 = 5.4 gpm at 1800 rpm. As shown above, gear pump flow can be approximately determined by multiplying the
WORLD
PUMPS
DECEMBER
given pump constant (gpr) by rpm - this produces the theoretical flow. Depending on viscosity and differential pressure, some flow “slips” back to suction through the lateral and radial clearances. You need to refer to the manufacturers pump performance curves, to determine the proper correction for slip. However, as a rule-of-thumb, above approximately 200 cP viscosity, a correction for slip is negligible; around 100 CP the slip may represent 5 - 10% of theoretical flow; and below 50 CP you would need the curves or tabulations. Q
Viscosity conversion rule-of-thumb
It may be helpful to think of fluids as “thin”, “medium”, and “thick”, in terms of viscosity, which has a profound effect on slip on power. Examples of “thin” fluids (0.5 - 2 cP) are water,
1998 0 1998 Elsevier
0262 1762/98/$19.00 Science Ltd. All rights reserved.
PECIAL FEATURE
cation of suction piping by using short, straight run pipe, of sufficiently large diameter to minimize friction).The filling cavity problem can be solved by slowing the pump speed (to allow more resident time for the cavity to fill), by increasing the number of gear teeth. Sometimes a simple sound Lev Ndlk, of Roper enclosure can be effec- Pump Company. tive. A “metallic” type noise could be a sign of incorBushings/bearings selection rectly set relief valve, which, if open, allows a Gear pump rotors (gears and shafts) are typically shortcut of liquid from discharge to suction. supported by product-lubricated bushings. These Check the RV-setting - the spring might have operate without contact at high viscocities on a hung up or inadequately compressed.The oppohydrodynamic pressure wedge, and with hydro- site problem to that is the RV not reacting to static lubrication at low viscosity, where their load pressure at all. Check if the RV-valve is not “backwards”, facing suction, which would make it inop-1 erative and not responding to increased discharge PV Abraston resistance pressure. 30 000 Best
kerosene, naphtha; an example of “medium” would be oil for your car engine; while honey, tar, glues could reach well above the 10 000 CP Gear pumps outperform centrifugal pumps, in terms of flow and efficiency, for applications with viscous fluids (over 200 CP or so).Traditionally, “thin” liquids applications were dominated by centrifugal pumps - however, new technologies are now allowing gear pumps to be applied to low viscosities.These gear pump designs include pressure loaded endplates to minimize lateral clearances to a fluid film range, and controlled topography roller bearings have been successfully applied to such low viscosity liquids as naphtha (0.5 CP).
a
60 000
Good
120 000
Worst
carrying capability is characterized by the PVvalue. Bushing material is selected to be an optimum between “dry-running” ability, and resistance to abrasion. When special controlled topography roller bearings are used for low viscosity applications, gear pumps’ pressure capability can be increased by a factor from 2 to 4.
0A Noise “Pebble-like” noise is a sign of cavitation, which, for gear pumps, can be traced to two sources. First, a classic vaporization of liquid at low suction pressure (below vapor), and second, difficulty in filling-out the gear tooth cavities (for high viscosity liquids). The remedy for the first cause is to increase suction pressure (by level elevation, and simplifi-
internal gear 270 1200 -50” min
Most problems turn out to have a simple solution, but it can take a long time to realize it. Be sure you look at all the variables and gather a checklist of possible culprits. Then, methodically, separate them one by one.The solution can often become obvious at that point.
ourExpelt... Dr Nelik is Vice President of Engineering and Quality Assurance of Roper Pump Company, Commerce, GA, USA. He has nearly twenty years’experience with centrifugal and positive displacement pumps, holding previous positions with IngersollRand (12 years) and Goulds (4 years) pump companies. Lev is a member of the Advisory Committee of the Texas A&M Pump User Symposium, an Associate Technical Editor for the Journal of Fluids Engineering, a Full Member of the ASME and a CertitIed APICS member.
400”max
2500000 40 40 Port akre (mm) Weight (kg)
15min 10 min
4!5onlax 330Omax
WORLD
PUMPS
DECEMBER
1998
PECIAL S mm=
Housing Gears
Meehanite metal, FCD450, SCSI 3, SCS14, SCSI 6, SCS23, SCS24 Meehanite metal, FCD450, S45C SACM645, SUS304, SUS316, SUS316L, SUS630, SCS13, SCS14, SCSl6, SCS23, SCS24, BC3
V-belt, chain drive, direct coupled geared motor, direct coupled variable motor, inverter drive, magnetic drive Easy maintenance - one point seal construction makes all wetted internal components easily disassembled, inspected and flushed. Wide range of application - from low to high viscosity, and a wide range of temperatures. Daido Machinery Corporation is a dedicated Japanese manufacturer of positive displacement internal gear pumps. Its products are used widely throughout Japan and overseas, in the food , chemical, petrochemical, plastic and other industries. Daido says it has received many enquiries for larger capacity gear pumps and plans to meet requirements by either upsizing its product range or applying a new profile gear. The new TaocloidTM gear profile will contribute to increased gear speed and volumetric efficiency. One of its largest pumps is equipped with 600 mm diameter gears and 300 mm inlet and outlet ports. The pump has a maximum displacement of 26.8 l/rev, and handles high viscous polymer solution with a viscosity of 70 000 CR at a temperature of 65°C. It is compatible with viscosity fluctuation, fitted with a double mechanical seal and the accompanying flushing system. Daido Machinery Corporation, l-2-7, Hamamatsucho, Minatoka, Tokyo 105-0013, Japan. Tel: +81 3 3433 878; Fax: +Ql 3 3433 7590.
Internal gear 137 3450 -50” min
10 Sankyo Bldg.,
357” max
440 000 42 28 25 min 9.3 min
150 max 355 max
Housing Gears
Cast iron, cast steel, 316 sst Ductile iron, 316 ss
Direct coupled, gear reducer, v-belt
F in
Rotor support bushing for high pressure operation. Large oversize ports for low NPSH operation. Seal cavity vent to suction for reduced seal face loads. Internal automatic idler bushing lubrication. Variable centerline heights. Rear pull-out design. Extreme duty abrasive handling models. PTFE based high viscosity liquid seal. Large capacity pumps with mechanical seal or packing on shaft sleeve. Gormen-Rupp, PO Box 1217 Mansfield, OH 44901 - 1217, USA. Tel: +1419 755 1432; Fax: +l 419 755 1251; E-mail: [email protected]; www.gormanrupp.com
PECIAL FEATum
Internal gear 2.7 1800 0” min
150” max
External gear 0.015 3600 0” min
95” max
301200 316 316
10 000 7/10 7/l 0 15 min 17 min
32 max 80 max
Rc1!8 min 2.1 min
Rc3/8 max 7.2 max
Housing
Stainless steel, PVC and ETFE SIC or i!rO, SIC
Housing Gears
GFR-RPS, SUS31” PPS, CFR-PEEK PTFE CFR-RPS AC220-240V or AC1 15V, DC maim
Gears
Drive opttons
4P - Standard motor, reduction gear motor, inverter control
speclo?Iwhlma:
GX &GM range - Ceramic gears, ability to handle fine slurries, both high and low viscosity liquids can be handled. Pulse-free and fixed rate injection. GM-V range - Sealless, non-meteric corrosion resistance, ceramic gears, iou flow rate, high head and pulsation free, easy flow control. Outstanding corm OEM constructions for materials. sealless resistant sion applications, thermal resistance
Rsoenttmrovattona:
SIC fine ceramic internal gear pump Pulseless metering pump system for hypochloric soda injection Employing DC motor in its MDG range - easy to control flow rate by changing voltage, with less heat, low noise and less vibration.
COfltWt:
lwaki Co Ltd, 2-6-6 Kanda-Sudacho Chiyoda-Ku, Tokyo 101 - 8558 Japan. Tel: +81 3 3254 2935; Fax:: +81 3 3252 8892; www.iwaki-pumps.co.jp/
Internal gear 250 3000 -40” min
300” max
100 000 20 16 1.85 min 3 min
200 ma.x 550 max
Cast iron Housing Gears
Nodular cast iron Cast steel stainless steel
Synchronus motor, geared motor, air motor Heating jackets available for front cover and pump body. Integral safety rel@ valves available on request Direction of rotation is independent. J P Pumps has developed a modular system of TopGear SRTM pumps whicil can be fitted with five different types of shaft seal arrangements enabling bespoke assembly and easy part-replacements
J P Pumps Limited, Meadowbrook Industrial Centre, Maxwell Way, Crawley, Sussex, RHlO 2SA, UK.Tel: +44 1293 553495; Fax: +44 1293 524635.
WORLD
PUMPS
DECEMBER
1998
Pump type
Internal gear
Max flowmte (m%) Max w-d mv
Te2mpemtummnge(“C)
12.5 10000 -46” min
Max viecoslty (cSt) Max sy&wn pressure (bar) Max dlfhmnt&l pmssum (bar)
20 000 103 12
Port dzes (mm) W & W (kg)
3 min 0.5 min
63.5 max 190 max
Mstsrlal optfons
Housing Gears
316 SS, Hastelloy C, cast iron, bronze PTFE, RYTON, 316 SS, Hastelloy C, carbon steel
Drive optlone
DC/AC/Air and Flameproof
special feeturea:
A wide range of pumps are available with magnetic drive as well as conventional packed gland, single and double mechanical pumps.
contsct:
Michael Smith Engineers, Oaks Road, Woking, Surrey GU21 1 PH, UK. Tel: +44 1483 771871; Fax: +44 1483 723110.
Pumptype
External gear
Msxftowmte(d/h) Ma speed@ P m Temperrture~ mnge (“C)
273 3600 -29” min
Max vlscosny (cst) Max system pressure (bar) Max dlfterential pmssum (bar)
1 000 000 83 83
316” max
315” max
9.5 min 2 min
203 max 365 max
MateJlial optlone
Housing Gears
Cast iron, ductile iron, cast steel, 316 stainless Cast iron, ductile iron, steel, stainless steel
Drive optlons
Direct motor speed or reduced speed via integral gear reducer
spsclalfeetums:
Most units can incorporate a variety of options including seals, bushings, and drive arrangements for complete customization
Reoent Innovetlons:
The ROCTM pump is offered in response to demands from the chemical/petrochemical process market for a less complicated stainless steel pump that will provide easy maintenance and lower total cost of ownership. The ROC Pump Series incorporates “D” style bushings, eliminating the need for separate wear plates. All rotating components are accessible from the rear of the unit, without disturbing piping, and the unit has 25% fewer total parts than comparable units.
Contact:
Roper Pump Company, PO Box 269 Commerce, GA 30529, USA. Tel: +l 706 335 5551; Fax: +l 706 335 5505; E-mail: [email protected]; www.roperpumps.com
PECIAL FEATURE
Internal gear 125 1800 -73" min
343" max
46oooo 20.7 13.8 25 min 5.6 min
150max 318 max
Hcuslng Gear5
Cast iron, Ductbim
Direct drive, reducw motor,
motor ture design
l~t~nal relief vafva, a~aa~~n resistant ~aturss, high tern ~ea~r~, Meets API 876 standards High viscosity seal options
Tuthlll Pump Dtvislon, 12 Tel: +I 708 388
l~er~i
gear
External gear
345 1750 -85" min
6.0 1750 425"max
440 000 14bar 14bar
220~ 34bar 34bar
1.5 min 17 min
8.0 snax 65omax
Houshg ca?tears
Cast iron, d
Gear
40% min
230°C max
375min 3 min
1.5max 18max
iron, ss steel Cast iron, duct& iron, stalnkss steel
ucer, diract, V-belt, ma~~tic cou sands of vari~ss,
WORLD
PUMPS
DECEMBER
1998
S PECIAL -
FEATURJZ
Max Viscos~~ (cP): Msx system pressure (tlsr) Max dMerenUal pressure (bar)
20 ooo 13.8 bar 10 bar
port
17 min 5 min
30 max 6max
Mewieloptions
Housing Gears
17-4 Alloy 88 (proprietary, non-galling)
Drlveoptlons
Direct and external coupled variable speed motors
BpeclRlfeetures:
Ceramic wear plates for superior wear and durability. Fast cleaning up to 600 rpm. Product is excluded from shaft area. Tight tolerances
Recent Innovations:
The new Universal Gear UG Series Pump is designed for accurate feeding and quick changeover. The pump is an external gear pump designed for rapid cleaning. A combination of rolling element bearings and mechanical seals allows the pump to run at speeds up to 1000 rpm for quidc product changes. By incorporating mechanical seals into the faces of the gears, product is excluded from the shaft area and the total volume of product contained in the pump is reduced. Cleaning time required by the pump is reduced by eliminating the need to clean crevices of the shaft-to-gear interface.
contact
Waukesha Cherry-Burrell, 611 Sugar Creek Road, Delavan, Wl 63115, USA. Tel: +l 414 728 1900; Fax: +l 414 728 4904; E.mall: custserv@ weukesha-cb.com; www.waukesha-cb.com
SiZcrS (nlm)
WdgM
(kg)
I External rotary gear Flow range (&/mln): speed range: Tempenhpp range (“C):
90000 300 rpm 32” min
Max Viscos~~ (cP): Msx system pressure (tlsr) Max dMerenUal pressure (bar)
2OOoccJJ 680 400 Housing Gear
510” max
400 series stainless steel, D2, M2, or M4 tool steel 400 series stainless steel, 02, M2, or M4 tool steel
Drlveoptlons
AC and DC controllers and motors; explosion-proof and washdown-duty motors; mechanical drive systems.
Bpeclelfeetures:
Manufacturing tolerances to 0.00005 inch, minimizing internal clearances and assuring accurate and precise metering. Submersible pump designs available. Various types of seals availatde (mechanical seals, Teflon lip seals, packing seals). Wii variety of elastomers available. C-9000 corrosion-resistant chemical duty pump; Precise DC speed controller can maintain 0.01% accuracy of set point speeds and also accept automated inMaces.
Recent Innovations:
which
contact
WORLD
PUMPS
Zenith Pumps (a dlvlslon of Parker Hannlfln Corporation), 5910 Elwln Buchanan Drlve, Sanford, North Carolina 27339, USA. Tel: +l 919 774 7667; Fax: +l 919 774 5952; E-mail: [email protected]; www. perker.com
DECEMBER
1998
FEATURE
Focus on gear pumps ZWs montb seestbe first of wbat will of the rotor in relation to the pump cover can be hopefully become a regular series: a increased or decreased according to the viscosity troublesbooting guide to pump selec- of the medium. tion, installation and operation. Lev Nelik, porn Roper Pumps, is our first External External gear pumps are basically comprised of contributor. Tbereafler as usual, we two intermeshing gears of the same diameter and explore tbe product portfolios from form, mounted on separate spindles and housed some tbe world’s leading manufactur- in a close fitting casing. Inlet and outlet ports are ers. If you’re in tbe market for a gear formed in the sides of the casing, in line with the pump, tbis sbould be a fine place to point of meshing. As the teeth intermesh on the start. Firstly, tbougb, a quick run inlet side, the volume on that side is reduced by tbtvugb tbe basicgear pump principles the volume of two tooth spaces, creating a suction effect. Oil is carried round to the delivery side in in lesstban 250 words.. . the pockets between adjacent teeth, and displaced under pressure through the delivery port.
Operating
principles B
Internal As the pump rotates, the rotor with internal gearing A (see diagram) drives the idler B inside an enclosed casing.The idler pin on which the idler B rotates is located eccentrically in relation to the rotorA.When the rotor starts rotating in the direction indicated, the rotor and idler gears unmesh. The chamber C between these gears is now filled with liquid. At D the teeth mesh again, thus forcing the liquid through the discharge pipe.This produces a non-pulsating liquid flow, whose capacity is determined by the speed.The wall of the pump casing and the crescent-shaped partition E separating rotor and idler act as a seal between suction and discharge side.The axial play
m 0
Internal gear pump operation (courtesy J P Pumps).
Gear Pumps - Quick Tips and Guidelines Flow approximation
Gear pumps belong to a family of positive displacement pumps, transferring constant amount of flow with each revolution (constant gpr - gallons per revolution). Many manufacturers utilize the gpr characteristic to designate their pump models, proving a quick convenient tip to approximately determine the pump flow based on its ‘pmFor example, a Roper Pump model 3622 implies a 3600~series pump with 0.22 gpr, and a 3617 pump would deliver 0.17 x 600 = 102 gpm at 600 rpm. Similarly, an ROC-03 stainless pump for chemical applications would deliver 0.003 x 1800 = 5.4 gpm at 1800 rpm. As shown above, gear pump flow can be approximately determined by multiplying the
WORLD
PUMPS
DECEMBER
given pump constant (gpr) by rpm - this produces the theoretical flow. Depending on viscosity and differential pressure, some flow “slips” back to suction through the lateral and radial clearances. You need to refer to the manufacturers pump performance curves, to determine the proper correction for slip. However, as a rule-of-thumb, above approximately 200 cP viscosity, a correction for slip is negligible; around 100 CP the slip may represent 5 - 10% of theoretical flow; and below 50 CP you would need the curves or tabulations. Q
Viscosity conversion rule-of-thumb
It may be helpful to think of fluids as “thin”, “medium”, and “thick”, in terms of viscosity, which has a profound effect on slip on power. Examples of “thin” fluids (0.5 - 2 cP) are water,
1998 0 1998 Elsevier
0262 1762/98/$19.00 Science Ltd. All rights reserved.
PECIAL FEATURE
cation of suction piping by using short, straight run pipe, of sufficiently large diameter to minimize friction).The filling cavity problem can be solved by slowing the pump speed (to allow more resident time for the cavity to fill), by increasing the number of gear teeth. Sometimes a simple sound Lev Ndlk, of Roper enclosure can be effec- Pump Company. tive. A “metallic” type noise could be a sign of incorBushings/bearings selection rectly set relief valve, which, if open, allows a Gear pump rotors (gears and shafts) are typically shortcut of liquid from discharge to suction. supported by product-lubricated bushings. These Check the RV-setting - the spring might have operate without contact at high viscocities on a hung up or inadequately compressed.The oppohydrodynamic pressure wedge, and with hydro- site problem to that is the RV not reacting to static lubrication at low viscosity, where their load pressure at all. Check if the RV-valve is not “backwards”, facing suction, which would make it inop-1 erative and not responding to increased discharge PV Abraston resistance pressure. 30 000 Best
kerosene, naphtha; an example of “medium” would be oil for your car engine; while honey, tar, glues could reach well above the 10 000 CP Gear pumps outperform centrifugal pumps, in terms of flow and efficiency, for applications with viscous fluids (over 200 CP or so).Traditionally, “thin” liquids applications were dominated by centrifugal pumps - however, new technologies are now allowing gear pumps to be applied to low viscosities.These gear pump designs include pressure loaded endplates to minimize lateral clearances to a fluid film range, and controlled topography roller bearings have been successfully applied to such low viscosity liquids as naphtha (0.5 CP).
a
60 000
Good
120 000
Worst
carrying capability is characterized by the PVvalue. Bushing material is selected to be an optimum between “dry-running” ability, and resistance to abrasion. When special controlled topography roller bearings are used for low viscosity applications, gear pumps’ pressure capability can be increased by a factor from 2 to 4.
0A Noise “Pebble-like” noise is a sign of cavitation, which, for gear pumps, can be traced to two sources. First, a classic vaporization of liquid at low suction pressure (below vapor), and second, difficulty in filling-out the gear tooth cavities (for high viscosity liquids). The remedy for the first cause is to increase suction pressure (by level elevation, and simplifi-
internal gear 270 1200 -50” min
Most problems turn out to have a simple solution, but it can take a long time to realize it. Be sure you look at all the variables and gather a checklist of possible culprits. Then, methodically, separate them one by one.The solution can often become obvious at that point.
ourExpelt... Dr Nelik is Vice President of Engineering and Quality Assurance of Roper Pump Company, Commerce, GA, USA. He has nearly twenty years’experience with centrifugal and positive displacement pumps, holding previous positions with IngersollRand (12 years) and Goulds (4 years) pump companies. Lev is a member of the Advisory Committee of the Texas A&M Pump User Symposium, an Associate Technical Editor for the Journal of Fluids Engineering, a Full Member of the ASME and a CertitIed APICS member.
400”max
2500000 40 40 Port akre (mm) Weight (kg)
15min 10 min
4!5onlax 330Omax
WORLD
PUMPS
DECEMBER
1998
PECIAL S mm=
Housing Gears
Meehanite metal, FCD450, SCSI 3, SCS14, SCSI 6, SCS23, SCS24 Meehanite metal, FCD450, S45C SACM645, SUS304, SUS316, SUS316L, SUS630, SCS13, SCS14, SCSl6, SCS23, SCS24, BC3
V-belt, chain drive, direct coupled geared motor, direct coupled variable motor, inverter drive, magnetic drive Easy maintenance - one point seal construction makes all wetted internal components easily disassembled, inspected and flushed. Wide range of application - from low to high viscosity, and a wide range of temperatures. Daido Machinery Corporation is a dedicated Japanese manufacturer of positive displacement internal gear pumps. Its products are used widely throughout Japan and overseas, in the food , chemical, petrochemical, plastic and other industries. Daido says it has received many enquiries for larger capacity gear pumps and plans to meet requirements by either upsizing its product range or applying a new profile gear. The new TaocloidTM gear profile will contribute to increased gear speed and volumetric efficiency. One of its largest pumps is equipped with 600 mm diameter gears and 300 mm inlet and outlet ports. The pump has a maximum displacement of 26.8 l/rev, and handles high viscous polymer solution with a viscosity of 70 000 CR at a temperature of 65°C. It is compatible with viscosity fluctuation, fitted with a double mechanical seal and the accompanying flushing system. Daido Machinery Corporation, l-2-7, Hamamatsucho, Minatoka, Tokyo 105-0013, Japan. Tel: +81 3 3433 878; Fax: +Ql 3 3433 7590.
Internal gear 137 3450 -50” min
10 Sankyo Bldg.,
357” max
440 000 42 28 25 min 9.3 min
150 max 355 max
Housing Gears
Cast iron, cast steel, 316 sst Ductile iron, 316 ss
Direct coupled, gear reducer, v-belt
F in
Rotor support bushing for high pressure operation. Large oversize ports for low NPSH operation. Seal cavity vent to suction for reduced seal face loads. Internal automatic idler bushing lubrication. Variable centerline heights. Rear pull-out design. Extreme duty abrasive handling models. PTFE based high viscosity liquid seal. Large capacity pumps with mechanical seal or packing on shaft sleeve. Gormen-Rupp, PO Box 1217 Mansfield, OH 44901 - 1217, USA. Tel: +1419 755 1432; Fax: +l 419 755 1251; E-mail: [email protected]; www.gormanrupp.com
PECIAL FEATum
Internal gear 2.7 1800 0” min
150” max
External gear 0.015 3600 0” min
95” max
301200 316 316
10 000 7/10 7/l 0 15 min 17 min
32 max 80 max
Rc1!8 min 2.1 min
Rc3/8 max 7.2 max
Housing
Stainless steel, PVC and ETFE SIC or i!rO, SIC
Housing Gears
GFR-RPS, SUS31” PPS, CFR-PEEK PTFE CFR-RPS AC220-240V or AC1 15V, DC maim
Gears
Drive opttons
4P - Standard motor, reduction gear motor, inverter control
speclo?Iwhlma:
GX &GM range - Ceramic gears, ability to handle fine slurries, both high and low viscosity liquids can be handled. Pulse-free and fixed rate injection. GM-V range - Sealless, non-meteric corrosion resistance, ceramic gears, iou flow rate, high head and pulsation free, easy flow control. Outstanding corm OEM constructions for materials. sealless resistant sion applications, thermal resistance
Rsoenttmrovattona:
SIC fine ceramic internal gear pump Pulseless metering pump system for hypochloric soda injection Employing DC motor in its MDG range - easy to control flow rate by changing voltage, with less heat, low noise and less vibration.
COfltWt:
lwaki Co Ltd, 2-6-6 Kanda-Sudacho Chiyoda-Ku, Tokyo 101 - 8558 Japan. Tel: +81 3 3254 2935; Fax:: +81 3 3252 8892; www.iwaki-pumps.co.jp/
Internal gear 250 3000 -40” min
300” max
100 000 20 16 1.85 min 3 min
200 ma.x 550 max
Cast iron Housing Gears
Nodular cast iron Cast steel stainless steel
Synchronus motor, geared motor, air motor Heating jackets available for front cover and pump body. Integral safety rel@ valves available on request Direction of rotation is independent. J P Pumps has developed a modular system of TopGear SRTM pumps whicil can be fitted with five different types of shaft seal arrangements enabling bespoke assembly and easy part-replacements
J P Pumps Limited, Meadowbrook Industrial Centre, Maxwell Way, Crawley, Sussex, RHlO 2SA, UK.Tel: +44 1293 553495; Fax: +44 1293 524635.
WORLD
PUMPS
DECEMBER
1998
Pump type
Internal gear
Max flowmte (m%) Max w-d mv
Te2mpemtummnge(“C)
12.5 10000 -46” min
Max viecoslty (cSt) Max sy&wn pressure (bar) Max dlfhmnt&l pmssum (bar)
20 000 103 12
Port dzes (mm) W & W (kg)
3 min 0.5 min
63.5 max 190 max
Mstsrlal optfons
Housing Gears
316 SS, Hastelloy C, cast iron, bronze PTFE, RYTON, 316 SS, Hastelloy C, carbon steel
Drive optlone
DC/AC/Air and Flameproof
special feeturea:
A wide range of pumps are available with magnetic drive as well as conventional packed gland, single and double mechanical pumps.
contsct:
Michael Smith Engineers, Oaks Road, Woking, Surrey GU21 1 PH, UK. Tel: +44 1483 771871; Fax: +44 1483 723110.
Pumptype
External gear
Msxftowmte(d/h) Ma speed@ P m Temperrture~ mnge (“C)
273 3600 -29” min
Max vlscosny (cst) Max system pressure (bar) Max dlfterential pmssum (bar)
1 000 000 83 83
316” max
315” max
9.5 min 2 min
203 max 365 max
MateJlial optlone
Housing Gears
Cast iron, ductile iron, cast steel, 316 stainless Cast iron, ductile iron, steel, stainless steel
Drive optlons
Direct motor speed or reduced speed via integral gear reducer
spsclalfeetums:
Most units can incorporate a variety of options including seals, bushings, and drive arrangements for complete customization
Reoent Innovetlons:
The ROCTM pump is offered in response to demands from the chemical/petrochemical process market for a less complicated stainless steel pump that will provide easy maintenance and lower total cost of ownership. The ROC Pump Series incorporates “D” style bushings, eliminating the need for separate wear plates. All rotating components are accessible from the rear of the unit, without disturbing piping, and the unit has 25% fewer total parts than comparable units.
Contact:
Roper Pump Company, PO Box 269 Commerce, GA 30529, USA. Tel: +l 706 335 5551; Fax: +l 706 335 5505; E-mail: [email protected]; www.roperpumps.com
PECIAL FEATURE
Internal gear 125 1800 -73" min
343" max
46oooo 20.7 13.8 25 min 5.6 min
150max 318 max
Hcuslng Gear5
Cast iron, Ductbim
Direct drive, reducw motor,
motor ture design
l~t~nal relief vafva, a~aa~~n resistant ~aturss, high tern ~ea~r~, Meets API 876 standards High viscosity seal options
Tuthlll Pump Dtvislon, 12 Tel: +I 708 388
l~er~i
gear
External gear
345 1750 -85" min
6.0 1750 425"max
440 000 14bar 14bar
220~ 34bar 34bar
1.5 min 17 min
8.0 snax 65omax
Houshg ca?tears
Cast iron, d
Gear
40% min
230°C max
375min 3 min
1.5max 18max
iron, ss steel Cast iron, duct& iron, stalnkss steel
ucer, diract, V-belt, ma~~tic cou sands of vari~ss,
WORLD
PUMPS
DECEMBER
1998
S PECIAL -
FEATURJZ
Max Viscos~~ (cP): Msx system pressure (tlsr) Max dMerenUal pressure (bar)
20 ooo 13.8 bar 10 bar
port
17 min 5 min
30 max 6max
Mewieloptions
Housing Gears
17-4 Alloy 88 (proprietary, non-galling)
Drlveoptlons
Direct and external coupled variable speed motors
BpeclRlfeetures:
Ceramic wear plates for superior wear and durability. Fast cleaning up to 600 rpm. Product is excluded from shaft area. Tight tolerances
Recent Innovations:
The new Universal Gear UG Series Pump is designed for accurate feeding and quick changeover. The pump is an external gear pump designed for rapid cleaning. A combination of rolling element bearings and mechanical seals allows the pump to run at speeds up to 1000 rpm for quidc product changes. By incorporating mechanical seals into the faces of the gears, product is excluded from the shaft area and the total volume of product contained in the pump is reduced. Cleaning time required by the pump is reduced by eliminating the need to clean crevices of the shaft-to-gear interface.
contact
Waukesha Cherry-Burrell, 611 Sugar Creek Road, Delavan, Wl 63115, USA. Tel: +l 414 728 1900; Fax: +l 414 728 4904; E.mall: custserv@ weukesha-cb.com; www.waukesha-cb.com
SiZcrS (nlm)
WdgM
(kg)
I External rotary gear Flow range (&/mln): speed range: Tempenhpp range (“C):
90000 300 rpm 32” min
Max Viscos~~ (cP): Msx system pressure (tlsr) Max dMerenUal pressure (bar)
2OOoccJJ 680 400 Housing Gear
510” max
400 series stainless steel, D2, M2, or M4 tool steel 400 series stainless steel, 02, M2, or M4 tool steel
Drlveoptlons
AC and DC controllers and motors; explosion-proof and washdown-duty motors; mechanical drive systems.
Bpeclelfeetures:
Manufacturing tolerances to 0.00005 inch, minimizing internal clearances and assuring accurate and precise metering. Submersible pump designs available. Various types of seals availatde (mechanical seals, Teflon lip seals, packing seals). Wii variety of elastomers available. C-9000 corrosion-resistant chemical duty pump; Precise DC speed controller can maintain 0.01% accuracy of set point speeds and also accept automated inMaces.
Recent Innovations:
which
contact
WORLD
PUMPS
Zenith Pumps (a dlvlslon of Parker Hannlfln Corporation), 5910 Elwln Buchanan Drlve, Sanford, North Carolina 27339, USA. Tel: +l 919 774 7667; Fax: +l 919 774 5952; E-mail: [email protected]; www. perker.com
DECEMBER
1998