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DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS  ENGLISH  71569282 - 10/09

Page 33 of 60

5.10.2  Viscosity

The pump is designed to deliver rated capacity at
rated head for a liquid with a particular viscosity.

When contemplating operation at some viscosity
other than that for which the pump was originally
designed and/or applied, the changed conditions
should be referred to Flowserve for
recommendations.

5.10.3  Changing the Pump speed

Changing the speed of a centrifugal pump changes
the capacity, total head and brake Horse Power. The
capacity will vary in a direct ratio with the speed,
whereas the total head will vary as the ratio of the
speed squared. The brake Horse Power will vary as
the ratio of the speed cubed except in cases where
the speed change also affects the efficiency of the
pump.

When contemplating speeds other than of the original
condition, refer to Flowserve for recommendations.

5.10.4  Net positive suction head (NPSH)

Any liquid, hot or cold, must be forced into the
impeller of the pump without vaporization by the
pressure of the vessel from which the pump takes its
suction.

The head of liquid necessary to force the required
flow into the pump is called the Net Positive Suction
Head. This value, more commonly called NPSH, is
the head above the vapor pressure of the liquid at the
pumping temperature.

There are two kinds of NPSH: The NPSHR by the
pump, as shown on the pump curve, is the head
needed to cover the losses in the pump suction. The
second NPSH is that available in the system, taking
into account the friction loss in suction piping, valves,
fittings etc. In all cases the NPSHA (measured above
vapor pressure) must exceed the NPSHR in order to
push the liquid into the pump.

Failure to have an adequate margin of NPSHA over
NPSHR will cause a reduction of pump performance
and internal damage to the pump.

Содержание DMX

Страница 1: ...ute Multistage single double suction horizontally split volute type centrifugal pumps type centrifugal pumps PCN 71569282 10 09 E PCN 71569282 10 09 E Original instructions Original instructions BALL BALL CONFIGURATION BALL BALL CONFIGURATION These instructions must be read prior to installing These instructions must be read prior to installing operating using and maintaining the operating using a...

Страница 2: ... 4 8 Protection system Protection systems s 27 27 5 5 COMMISSIONING START UP OPERATION COMMISSIONING START UP OPERATION AND SHUTDO AND SHUTDOWN WN 28 28 5 1 5 1 Precommissioning Precommissioning procedure procedure 28 28 5 2 5 2 Pump Pump lubricants lubricants 29 29 5 3 5 3 Impeller wearring Impeller wearring clearance clearance 31 31 5 4 5 4 Direction of rotation 31 Direction of rotation 31 5 5 5...

Страница 3: ...es ATEX Atmospheres ATEX Where applicable the Directives and any additional Where applicable the Directives and any additional Approvals cover important safety aspects relating to Approvals cover important safety aspects relating to machinery and equipment and the satisfactory machinery and equipment and the satisfactory provision of technical documents and safety provision of technical documents ...

Страница 4: ...assembly process 1 6 2 Personnel qualification and training All personnel involved in the operation installation inspection and maintenance of the unit must be qualified to carry out the work involved If the personnel in question do not already possess the necessary knowledge and skill appropriate training and instruction must be provided If required the operator may commission the manufacturer su...

Страница 5: ...s must not be insulated and drive motors and bearings may be hot If the temperature is greater than 68 C 154 F or below 5 C 20 F in a restricted zone or exceeds local regulations action as above shall be taken 1 6 4 Products used in potentially explosive atmospheres Measures are required to Avoid excessive temperature Prevent the build up of explosive mixtures Prevent the generation of sparks Prev...

Страница 6: ...liquid temperature is with the plant operator If an explosive atmosphere exists during the installation do not attempt to check the direction of rotation by starting the pump unfilled Even a short run time may give a high temperature resulting from contact between rotating and stationary components Where there is any risk of the pump being run against a closed valve generating high liquid and casi...

Страница 7: ...ed by draining or protecting the pump and ancillary systems Where there is the potential hazard of a loss of a seal barrier fluid or external flush the fluid shall be monitored If leakage of liquid to atmosphere can result in a hazard then a liquid detection device shall be installed 1 6 4 7 Maintenance to avoid the hazard CORRECT MAINTENANCE IS REQUIRED TO AVOID POTENTIAL HAZARDS WHICH GIVE A RIS...

Страница 8: ... determine the estimated sound pressure levels SPL expressed in dBA dB for DMX DMXD DMXH DMXDH pumps The values shown have been derived from actual noise test data and are based on the following conditions a Equipment is located in a free field above a reflecting plane in which the reduction in noise level in all directions is 6 dB in each octave band for each doubling of distance b Background noi...

Страница 9: ... Test Method for Compressive Test Method for Compressive Strength of Hydraulic Cement Mortars Modified Strength of Hydraulic Cement Mortars Modified ASTM C 469 87a ASTM C 469 87a Test Method for Static Modulus of Test Method for Static Modulus of Elasticity and Poisson s Ratio of Concrete in Elasticity and Poisson s Ratio of Concrete in Compression Compression ASTM C 496 90 ASTM C 496 90 Test Meth...

Страница 10: ...prevent turning Foundation complete description Foundation complete description b b Build a Build a dam around dam around the foundation the foundation to to contain contain grout materials grout materials Before grouting check level of Before grouting check level of machined pads of baseplate in both directions and machined pads of baseplate in both directions and perform a rough shaft coupling a...

Страница 11: ...er the edges of the baseplate evenly evenly Pour grout until level reaches top of dam Pour grout until level reaches top of dam Allow drying sufficiently to prevent grout from Allow drying sufficiently to prevent grout from overflowing while completing the remaining grouting overflowing while completing the remaining grouting Do not vibrate baseplate when grouting Do not vibrate baseplate when gro...

Страница 12: ... Offset misalignment Combined misalignment 4 4 1 2 Alignment methods The following methods may be used to align equipment train The methods a and b are dial indicator based a Rim and face alignment Rim and face alignment b Reverse rim indicator alignment Reverse rim indicator alignment c Laser alignment 4 4 2 Dial indicator based alignment 4 4 2 1 Check soft foot Soft foot can affect the alignment...

Страница 13: ...ansion is a factor The shims between the motor feet and mounting surface should be clean and dry This is especially critical for equipment that has been in service for some time and need to be realigned Water dirt and rust may change the height of the shim pack over a period of time Shims should be made large enough to support the weight of the motor on its mounting foot Do not use many thin shims...

Страница 14: ...s classification must have the pump support feet dowelled to the pedestal at the coupling end This maintains the coupling gap at the desired amount The pump feet at the opposite end are held from moving vertically by the use of a self locking nut The clearance between the base of the nut and the top of the pump foot should be 0 051 mm 0 002 in A Gib Block running parallel to the length of the pump...

Страница 15: ...red to prevent cavitation When dirt and scale have been removed from the system as indicated by no further change in pressure drop across the strainer with time the start up strainer may be removed or the screen may be replaced with one having larger openings If a permanent strainer will be used during normal operation the pressure differential needs to be monitored on a continuous basis If a perm...

Страница 16: ...ump uncoupled 4 7 Final shaft alignment check After connecting piping to the pump rotate the shaft several times by hand to ensure there is no binding and all parts are free Recheck the coupling alignment as previously described to ensure no pipe strain If pipe strain exists correct piping Refer to section entitled shaft coupling alignment and perform a coupling alignment check as outlined This ch...

Страница 17: ...rap to make sure it turns freely d Ensure that the mechanical seal is properly assembled and tightened Most cartridge seals are equipped with a spacer between the gland plate and drive collar This spacer must be removed before starting unit e Ensure coupling is properly aligned and lubricated and pump and driver are properly doweled Refer to shaft coupling alignment procedure f Ensure coupling gua...

Страница 18: ... Ensure all electrical hydraulic pneumatic sealant and lubrication systems as applicable are connected and operational Ensure the inlet pipe and pump casing are completely full of liquid before starting continuous duty operation 5 7 Starting the pump 5 7 1 Initial start up See 5 1 3 Initial start up procedure 5 7 2 Normal start up The starting procedure to be followed for normal start up is the sa...

Страница 19: ...ppropriate lubrication can result in overheating of the bearings bearing failures pump seizures and actual breakdown of the equipment exposing operating personnel to injury 5 9 Stopping and shutdown If motor driven de energize driver circuit If turbine driven stop turbine driven pumps by manually tripping the overspeed trip If pump stops abruptly when driver is shut down investigate for pump bindi...

Страница 20: ...eds other than of the original condition refer to Flowserve for recommendations 5 10 4 Net positive suction head NPSH Any liquid hot or cold must be forced into the impeller of the pump without vaporization by the pressure of the vessel from which the pump takes its suction The head of liquid necessary to force the required flow into the pump is called the Net Positive Suction Head This value more...

Страница 21: ...heated it will have to be pushed towards the center of the pump the split rings 2531 removed and quickly pulled from the end of the shaft The shaft is step machined at each impeller fit to ease the disassembly process It is recommended that each impeller be marked with stage number to insure proper reassembly 6 6 8 Heating impellers for removal a Apply heat torch with fine tip to periphery outer 3...

Страница 22: ... If new casing rings are used make sure that they seat in both the upper and lower half casing and that the anti rotation device is properly located in its respective lower half casing fit The use of a scraper on the ring to casing fit will help to fit the ring to the casing e Using a torch could change the metallurgy of the rings if too much heat is applied Removing impellers with torch is accept...

Страница 23: ...ings to facilitate mounting Bearings still wrapped in their original intimate wrap are placed on a shelf in a temperature controlled oven A temperature of 66 C 150 F for one half hour should be sufficient b When bearings are installed on shaft or journal sleeve make sure bearing is installed squarely and is firmly seated Hold bearing in place until it has cooled sufficiently so that it will not mo...

Страница 24: ...DMX DMXD DMXH DMXDH USER INSTRUCTIONS ENGLISH 71569282 10 09 Page 58 of 60 NOTES ...

Страница 25: ...DMX DMXD DMXH DMXDH USER INSTRUCTIONS ENGLISH 71569282 10 09 Page 59 of 60 NOTES ...

Страница 26: ...3 4434 Fax 1 713 803 4497 Asia Pacific Flowserve Pte Ltd 10 Tuas Loop Singapore 637345 Telephone 65 6771 0600 Fax 65 6779 4607 Your local Flowserve representative To find your local Flowserve representative please use the Sales Support Locator System found at www flowserve com Your Flowserve factory contacts Flowserve Corporation Parallelweg 6 4878 AH Etten Leur The Netherlands Telephone 31 76 502...

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