New END SUCTION CENTRIFUGAL PUMPS Page 9 October 1975

Transcription

1 New END SUCTION CENTRIFUGAL PUMPS Page 9 GENERAL LIMITATIONS Max. Temperature The maximum temperature of the liquid pumped by S.E.S.C. pumps depends upon the conduction of heat along the shaft to the bearings, the characteristics of the liquid being pumped, the method of stuffing box sealing and the strength of the pump casing material. Care must be taken when selecting pumps and the method of stuffing box sealing on high temperature applic.ations since the properties of the liquid being pumped greatly affect the selection. For. example, liquids such as water, which have very high vapor pressures at high temperatures, also have non-lubricaling qualities and therefore are, not suitable for standard mechanical seals. The high pressure necessary to keep these liquids in a liquid state also places a definite limitation on which pumps and methods of sealing are suitable. On high temperature applications, the method of stuffing box sealing must also include provisions for cooling the liquid in the stuffing box and cooling the shaft to eliminate the conduction of heat along the shaft to the bearings. The following stuffing box sealing methods can be used, up to the temperatures listed. Stuffing Box Sealing Maximum Temperature Degrees Farenheit Standard Packed Box 1) With internal seal passage, or no liquid to seal cage. 1) 250 2) With cold liquid to seal cage 2) 275 Water-cooled packed box 300* Standard or water-cooled packed box with flushing gland 350* John Crane Type 9 300** *Suitable packing to be supplied by Ampere. **Can be increased to 350 F. if seal installed in cooled stuffing box. Consult Ampere for recommendations on all applications where the above limitations are exceeded. Standard Pump Marketing Dept., East Orange, N. J.

2 Page 10 February 1979 Types CNG, CNGK END SUCTION CENTRIFUGAL PUMPS GENERAL DATA Suffersedes Issue TYPE CNG Pump Size Size Suction Size Discharge Casing Thickness* NO. 1 FRAME 3/4 CNG /4 5/16 3/4 CNGE /4 5/16 1 CNG-32 11/2 1 5/16 1 CNG-42 1% 1 5/16 ' 1 CNG-52 1% 1 5/16 1 CNG-64 11/2 1 5/16 NO. 2 FRAME 1 CNG /32 11/2 CNG-52 11/2 5/16 11/2 CNG-62 11/2 11/32 11/2 CNG-74 1% 11/32 11/2 CNG-84 11/2 3/8 1% CNG-104 1% 3/8 2 CNG /16 2 CNG /8 2 CNG /8 3 CNG /32 3 CNG /8 3 CNG /8 Cs1 N N N 01 cn V' et 47 NO. 3 FRAME 2 CNG /32 2 CNG /8 3 CNG /32 3 CNG /8 4 CNG /8 NO. 4 FRAME 4 CNG /8 6 CNG /8 6 CNG /8 6 CNGL /8 8 CNG NO. 5 FRAME /2 TYPE CNGK NO. 2 FRAME 1 CNGK-62 11/2 1 11/32 1% CNGK-84 11/2 11/2 3/8 2 CNGK Notes - 1. Maximum working pressure for all sizes listed above is 150 psi. 2. Hydrostatic test pressure for all sizes listed above is 300 psi. 8 CNG 104 Impeller Diameters Corrosion allowance for any CNG, CNGK is 1/8 in. minimum. All dimensions are in inches. *Casing thickness subject to foundry tolerance of 1/16 in. These thicknesses may be used in proposals. Where actual casing thickness must be recorded, include extra price for casing thickness drawing. Line No. D 1 (Inches) D 2 (Inches) Angle (Degrees) z 0 0 c5- CO CO CO N LO CO 11-15/ / / / / / / / /16 9-1/ /16 8-3/ / i.,an4 tea f' s

3 New END SUCTION CENTRIFUGAL PUMPS Page 11 GENERAL DATA Type CNG, CNGK FRAME SIZE AT IMPELLER SHAFT DIAMETER AT STUFFING BOX BETWEEN BEARINGS AT COUPLING TYPES CNG, SIZE OF KEYWAY AT COUPLING CNGK IMPELLER OVERHANG BEARING SPAN LINE SKF BEARING. SYMBOLS t THRUST WITH SEAL CAGE ' -RINGS PER BOX. WITHOUT SEAL CAGE STUFFING BOX SIZE OF PACKING DIAM. OF BORE.. DEPTH OF ' BOX I 9/16 15/16 1-1/8 5/8 3/16x3/32 5-1/2 3-7/ /8 1-3/8 1-9/16 1 1/4x1/8 7-1/ NR 6306 _ NR. 5/16 1-9/16 1-3/4 7 5/ / /8 1-3/4. 2-3/16 1-3/8 3/8x3/16 9-1/2 8-1/ NR /8 2-1/2. 3-3/ /8 2-1/8 2-3/8 1-3/8 3/8x3/16 II 8-1/ / / / /8. 2-3/4 2-3/4 2-1/8 1/2x1/4 II BG 7 1/2 3-3/4 3-11/16 All dimensions are in inches. * O.D. of Sleeve. Diameter under sleeve is 1 2 I/2 in. t These bearings are used in frame mounted pumps only. Casing PART MATERIALS OF CONSTRUCTION MATERIAL Suction Head Impeller Shaft Gland Frame Cast Iron Packing 28M Asbestos Seal Cage Teflon Shaft Slinger Neoprene Casing Gasket Durabla * Impeller Nut Impeller Nut Washer Tap Bolts, Studs & Nuts Key *Reusable acorn nut with dog eared lock washer. Standard Pump Marketing Dept., East Orange, N. J.

4 Page 12 END SUCTION CENTRIFUGAL PUMPS New October 1915 Crane Seals MECHANICAL SEALS Internal Seals TYPE CNG & CNGK PUMPS SK External Seals TYPE CMG & CNGK PUMPS 5K These seals cannot be used on CNG or CNGK pumps with jacketed stuffing boxes. The above drawings show typical installations of the Crane Type 9 seal on various S.E.S.C. pumps. LII An'el trs 4

5 New END SUCTION CENTRIFUGAL PUMPS Page 13 JOHN CRANE MECHANICAL SEALS Type 9 Seals we have chosen the most popular style Crane Seal in order to cover most of the,ipplications encountered. ' : This seal is the single internal or external type Crane Type 9 Seal. These seals can be installed in any SESC P ump. No modification of the standard stuffing box is required.", These seals cannot be applied to CNG or CNGK pumps which are built with jacketed boxes. The seals are so constructed that they can be installed either internally or ex.cernallv. (Refer below) SINGLE EXTERNAL CRANE TYPE 9 SEAL The external seal construction may be applied only when the pump has a solid shaft (no shaft sleeve). Therefore it can be applied to CNG and CNGK pumps without modification. SINGLE INTERNAL CRANE TYPE 9 SEAL The internal seal construction may be applied on any SESC pump, ievirdlef:s cf whett*r or not a sleeve construction or solid snaft construction is used. MATERIALS OF CONSTRUCTION CNG, CHGK Pumps 1. Stationary Seat Type 20 Stainless w/ Ceramic Facing 2. Gland 316 Stainless Steel 3. Wedge Teflon 4. Seal Washer Carbon 5. Retainer 316 Stainless Steel 6. Set Screw (not shown) 316 Stainless Steel 7. Springs 316 Stainless Steel 8. Disc 316 Stainless Steel 9. Snap Ring 316 Stainless Steel 10. Recirculation Piping 316 Stainless Steel (not shown) Parts No. 3,4,5,6,7,8 & 9 taken as a group constitute the rotor unit. Standard Pump Marketing Dept., East Orange, N. J.

6 Page 14 Type 9 Seals END SUCTION CENTRIFUGAL PUMPS JOHN CRANE MECHANICAL SEALS New Limitations Pressure must not exceed 35 psig on an externally mounted type 9 seal or 150 psig on an internally mount'ed type 9 seal. Pressure limitations of type 9B internal seal far exceed those of pump. 2. Temperature of liquid being pumped must not exceed 300F unless a water-cooled stuffing box is used. (Care must be taken not to recommend coolihg when this would cause crystallization, freezing, or solidifying of the liquid being pumped.) 3. Do not offer these seals on liquids being pumped above their atmospheric boiling point without referring to Ampere. 4. Do not use these seals on hydrocarbons with a specific gravity of 0.63 or less 5. Do not use these seals where fine solids or crystals are present in the liquid being pumped. 6. Do not apply these seals where the corrosion rate on the metal selected is greater than inches per year (IPY). If in doubt, consult Standard Pump Division, Sales Department. In addition these seals should not be used under the following conditions: A. Fluorine compounds, ar hydrofluosilicic acid- B. Solutions containing caustic soda. C. Nitric acid over 45% concentration. D. Chromic acid over 25% concentration. E. Oleum (100% or more sulfuric acid). F. Hydrogen peroxide over 15% concentration. For solutions which will not corrode the metal selected at a rate greater than IPY, but which are listed in one of the exceptions "B" through "F" above, a John Crane Seal can be supplied which is slightly modified from the standard, but which is not carried in stock at Ampere. The variation in construction, and price difference are listed below. (Shipment on pumps with these modified seals will be 6-8 weeks where pump parts are available in 4 weeks or less; if mpre than 4 weeks are required to obtain pump parts, add 2 weeks for seal installation and test). EXCEPTION UNDER PARAGRAPH NO. 6 ABOVE MODIFICATION REQUIRED Special Aluminum Oxide 01 0 Ring used rather than Ceramic Coated Stationary Seat. Special P-24 Carbon Washer. MODIFICATION DESIGNATION (To Be Used When Ordering) Aluminum Oxide 0 10 Stationary Seat and P-24 Carbon Washer A, C, D, E or F Solid Ceramic Ring used rather than Solis Ceramic Ring Ceramic Coated Stationary Seat. Special and Glass-Filled Glass-filled Teflon Washer rather than Teflon Washer Carbon. Lothdd n u.s 4

7 New END SUCTION CENTRIFUGAL PUMPS Page FEATURES ZOP Pump End for frame-mounted unit This is the "working" end of the pump. Here energy is imparted to the liquid. Here the diameter, rotating speed and width of impeller determine the head and capacity of your pump. Shown above Is a typical bearing frame assembly. This type unit must be mounted on a base, driven either through a coupling by a motor, engine, or turbine, or by belt-drive arrangement. The bearing frame assembly not only supports the pump casing and the shaft and bearings it also provides a stable surface by which the pump is mounted to the base plate. These pumps are available either with packed stuffing boxes or with mechanical seals. The basic design of this pump allows for conversion from packed box operation to mechanical seal operation or vice-versa after the pump is installed, in the event that changes in the service condition make such a change necessary. Design flexibility allows necessary modifications to be made for operation at temperature and pressure extremes. Standard Pump Marketing Dept., East Orange, N. J. 1. The three liquid ends are mounted on one frame size. 2. With Worthington's modern, precise machining techniques and superior quality control, accurate alignment of all parts is maintained. 3. Optimum design, ensures rugged shafts with minimum deflection. 4. A wide selection of liquid ends are available to meet your most exacting pump requirements. 5. Pump delivering heads to 200 feet, capacities to 250 gallons per minute are available (see coverage charts). 6. Pumps are svailable in either, ductile iron or acid-resistant bronze. 7. Minimum stuffing box leakage achieved through use of mechanical seals or packing. 8. Seal or packing cooling and lubrication can be effected through internal recirculation built into pump, or independent sealing from external source. 9. Jacketed stuffing boxes available for cooling or heating.

8 Page 2 END SUCTION CENTRIFUGAL PUMPS New CNGK, CNFEK FEATURES Type CNGK/CNFEK. Frame-mounted pump. Construction Features The self-priming pump that is part of a standard line of chemical pumps. Available in, ductile iron and acid resistant brbnze. Provides an economical solution to major corrosive self-priming pumping applications. Designed for pumping chemicals without repriming from: Sumps Pits Underground tanks Tank cars or trucks And also capable of pumping liquids containing air or vapor 10, E , Rugged frame The frame is Constructed of heavy cast-iron with the casing mounting ring gast,integrally. This ring is rabbeted as further assurance of accurate alignment. To attain the required alignment accuracy between the bearing bore and casing mounting flt, special, highly accurate machining techniques are employed. Bearings These pumps are all equipped with anti-friction ball bearings..they are sized to take the thrust and radial loads encountered and are designed for a minimum average life of 10 years. They are standard bearings, available locally. Bearing protection Contaminants are excluded from bearings by a system of deflectors, covers, and lip seals. Specific construction varies depending on method of lubrication (oil or grease) and material of pump (alloy versus iron, steel and bronze). In any case the system provided will be satisfactory for the service. 20F Lubrication Worthington Standard End-Suction Centrifugal Pumps are grease lubricated. For those who prefer oll lubrication, oil lubricated frames are also available with constantlevel oiler and visable oil reservoir where oil mist is constantly supplied to the bearings by rotating slingers which dip in the frame oil sump. WORTHITE A high-nickel, highchromium, molybdenum alloy steel. with.07% carbon content. i0v.1421b0 Shaft All shafts are one piece and are ground on all critical surfaces. A centrifugal pump must not only transmit power from the driver to the impeller, but must also withstand the radial load imposed on the impeller because of radial reaction. All shafts in this line are designed to transmit the power required and to withstand the bending that would result from radial reaction forces if an Inadequate shaft were used. In fact, on all pumps up to (n design capacity the force on the shaft under worst conditions causes less than Inch deflection of the shaft at the face of the stuffing box. Larger pumps have proportionately low deflection. LetAn'd ea ti..5.4.

9 New END SUCTION CENTRIFUGAL PUMPS Page 3 FEATURES CNGK, CNFEK Typical Sectional Views. Bearing frame. Frame features. Heavy cast-iron frame Rugged duty bearings with average life of 80,000 hours Available with grease or oil lubrication f fill 360 rabbet.to accurately align casing and assure -.haft cigir.i:ritricity with respect to stuffing box bore Liquid end features. Large diameter shaft provides maximum deflection of.002 inch at stuffing box face One-piece packing gland Stuffing box arranged to accommodate either packing and independent seal or commercially available mechanical seals Secured shaft sleeve... sealed against leakage Open impeller... hydraulically balanced Pump-out vanes on rear of impeller eliminates discharge pressure at stuffing box... keeps stuffing box clear of liquids Self-locking impeller nut Balance ports at eye of impeller allow suction pressure to exist on stuffing box Removable recirculation port Standard Pump Marketing Dept., East Orange, N. J.

10 Page 4 CNGK, CNFEK END SUCTION CENTRIFUGAL PUMPS FEATURES New TOTAL HEAD IN FEET 200 I MI lal 11111,RFIVELIO Uk li:'40 ::., Walla : , mil ' Itil% COMPLETE HYDRAULIC COVERAGE $50 TYPE CNGK / CNFEK SELF - PRIMING CENTRIFUGAL PUMP COVERAGE 60 CYCLE TOTAL HEAD IN FEE T III. ayiewcivrt -de NIII -en Igl railli , lin '.;415;R. P M is1111 Itlirri TYPE CNGK /CNFEK SELF - PRIMING CENTRIFUGAL PUMP COVERAGE 50 CYCLE lwiiiiiig ' i 14 5 a M beln...malliblriall illillipidal CAPACITY G.P.M. MATERIALS OF CONSTRUCTION CAPACITY GP.M. Name of Part Ductile Iron Casing Ductile Iron Suction Chamber Ductile Iron Recirculation Port Impel ler Ductile Iron Discharge Chamber Ductile Iron Shaft Steel (SAE 1035) Shaft Sleeve None (Solid Shaft) Steel Impeller Nut Steel Impeller Locking Insert Teflon Nylon Casing Gasket Durabla Durabla Gland Cast Iron Packing Blue African Asbestos Graphite Asbestos Seal Cage Teflon Teflon Slinger Neoprene Neoprene Bearings Ball Ball Bearing Frame Cast Iron Cast Iron Lesko Its I. 1, I

11 New END SUCTION CENTRIFUGAL PUMPS Page 5 FEATURES CNGK, CNFEK Stuffing Box Data. John Crane unbalanced internal type 9 seal. 20E Great care has been taken to design and build the selfpriming pump to minimize mechanical seal and packing maintenance. Shaft concentricity, with respect to the stuffing box, is assured by the precise machining of engaging parts. Shaft deflection is minimized and the shaft deflection at the face of the stuffing box will not exceed inches. The outboard end of the stuffing box is faced and turned accurately to allow an easy and accurate conversion to mechanical seals. The self-priming pump will accommodate commer- cially available mechanical seals most widely used in Chemical and Process services. Inside and outside seals, balanced and unbalanced, single and double are available. Auxiliary fittings such as stuffing box throat bushings, lip seals, etc. are also available. The stuffing box incorporates tapped openings for four-gland studs. Mechanical seal glands use four studs, packing glands use two. Mechanical teal glands make use of confined gaskets thus maintaining a positive seal, for high-pressure applications. A jacketed stuffing box is available where heating or cooling of the packing or mechanical seal is desired. Mechanical Seal Selection.. The proper selection of a mechanical seal requires that specific information be made available. From a corrosion standpoint, there are more critical areas in a mechanical seal than in the pump itself. Where the application of a centrifugal pump depends upon the proper selection of one suitable material of construction, the application of a mechanical seal for the same service depends upon the selection of numerous materials of construction for the stationary face, seal ring, shaft packing and small parts, etc. Therefore in order to obtain the desired results from a mechanical seal, it is necessary that all of the factors which affect its operation be known. For proper selection the following data is considered necessary: Liquid temperature Suction pressure Specific gravity Viscosity at pumping temperature Presence of solids or other impurities Composition of the liquid Corrosive or abrasiive nature of the liquid The type of process or system of which the pump is a part The above information is in addition to the hydraulic data ordinarily supplied which is necessary to choose the correct pump. Standard Pump Marketing Dept., East Orange, N. J.

12 Page 6 CNGK, CNFEK END SUCTION CENTRIFUGAL PUMPS FEATURES New Type CNG " Frame-Mounted Pump This line of corrosion-resistant pumpi covers the widest range of servicr s in the Chemical and allied industries. Twentv.nine pumps are available for capacities up to 4,900 gpm, heads to 450 ft. For maximum interchangeability, all 29 sizes are mounted on only five basic bearing frames. The same liquid end may be mounted on a Monobloe) (close-coupled) motor except for the 8 CNG-104. These pumps are available with packed stuffing boxes or mechanical seals. The basic design allows for conversion from packed box operation to mechanical seal operation or vice-versa after the pump is installed. Design flexibility allows modifications for 20E a wide range of temperatures and pressures. Construction Features Rugged Frame Bearing protection 20E The frame is constructed of heavy cast iron with the casing mounting ring cast integrally. This ring is rabbeted as further assurance of accurate alignment. To attain the required alignment accuracy between the bearing bore and casing mounting fit, special, highly accurate machining techniques are employed. 20E Contaminants are excluded from bearings by a system of deflectors, covers, and lip seals. Specific construction varies depending on method of lubrication (oil or grease) and material of pump (alloy versus iron, steel and bronze). In any case the system provided will be satisfactory for the service. Bearings These pumps are all equipped with 20E anti-friction ball bearings. They are sized to take the thrust and radial loads encountered and are designed for a minimum average life of 10 years. They are standard bearings, available locally. Shaft All shafts are one piece and are ground on all critical surfaces. A centrifugal pump shaft must not only transmit power from the driver to the impeller, but must also withstand the radial load imposed on Lubrication the impeller because of radial Worthington Standard End-Suction reaction. All shafts in this lime are Centrifugal Pumps are grease lubri- designed to transmit the power re- cated. For those who prefer oil quired and to withstand the radial lubrication, oil lubricated frames reaction forces. In fact, on all pumps are also available with constant- up to 500 gt;m design capacity the level oiler and visible oil reservoir force on the shaft under worst con- 20E where oil mist is constantly supplied to the bearings by rotating 20 E ditions causes less than inch deflection of the sliaft at the im- slingers which dip in the frame oil peller. Larger pumps have propor- sump. tionately low deflection. WORTHITES A high-nickel, high-chromium, molybdenum alloy steel, with.07% cartion content. See Back Cover for Detailed Information 1_,tho d 8w,