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IWAKI WALCHEM MFH Series Instruction Manual

Magnetic drive pump
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Thank you for selecting an Iwaki Walchem MDH-(F) Series magnetic drive pump. This
instruction manual explains the correct handling, maintenance, inspection and troubleshooting
procedures for your pump. Please read through it carefully to ensure the optimum performance,
safety and long service of your pump.
1
Unpacking and Inspection
Open the package and check that the product conforms to your order. Also, check each of the following
points. For any problem or inconsistency, contact your distributor at once.
1. Check that the model number and the HP indicated on the nameplate conform to the specifications of your
order.
2. Check that all the accessories you ordered are included.
3. Check that the pump body and parts have not been accidentally damaged or that any bolts or nuts have not
been loosened in transit.
Fig. 1
1

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Summary of Contents for IWAKI WALCHEM MFH Series

  • Page 1 Thank you for selecting an Iwaki Walchem MDH-(F) Series magnetic drive pump. This instruction manual explains the correct handling, maintenance, inspection and troubleshooting procedures for your pump. Please read through it carefully to ensure the optimum performance, safety and long service of your pump.
  • Page 2 IWAKI WALCHEM MAGNETIC DRIVE PUMP MDH-(F) SERIES INSTRUCTION MANUAL IWAKI WALCHEM Corporation...

  • Page 3: Table Of Contents

    Table of Contents Unpacking and Inspection......................1 Model Identification Guide ......................2 Specifications ..........................3 Handling ............................5 Installation, Piping and Wiring ...................... 7 Operation............................11 Maintenance and Inspection......................14 Troubleshooting ........................... 19 Parts Description and Exploded View..................23 Disassembly and Assembly of Pump ................... 24 Spare Parts............................

  • Page 4: Model Identification Guide

    Model Identification Guide MDH-F 1. Casing Material MDH: Glass fiber reinforced polypropylene (GFRPP) MDH-F: Carbon fiber reinforced fluoroplastic (ETFE) 2. Pump Size Suction × Discharge Suction × Discharge 1½" NPTM 1½" NPTM 2" NPTM 1½" NPTM 1½" NPTM 1½" NPTM 2"...

  • Page 5: Specifications

    4. Specific gravity capability at maximum flow with maximum impeller when fluid viscosity is 1cp. Specific gravity fluids up to 2.0 can be handled with appropriate trimming of impeller. Consult Iwaki Walchem or your distributor for recommended model and impeller trim.
  • Page 6 Materials of Main Components RETA INER RING (F425 O NLY) DRIVE M AG NET* FRO NT CASING BEA RING REA R THRU ST (CO NICAL) BASEPLATE FRO NT THRUST M OUTH RING IMPELLER REA R CA SING O -RING SPIN DLE M AGN ET CAPSULE Fig.

  • Page 7: Handling

    However, to ensure that this does not occur, Iwaki Walchem recommends that the pump be allowed to cool for at least 20 minutes after dry running before introducing fluid again.
  • Page 8 SiC bearings (KK type) can handle slurries if the density is 5% or less and the grain size is 2 mil (50 micron) or less. Prior to pumping such slurry liquid, you should call Iwaki Walchem or your distributor to verify that the operation is feasible.

  • Page 9: Installation, Piping And Wiring

    The lifting capability depends upon the liquid properties, temperature, and length of suction piping. For details, consult Iwaki Walchem or your distributor. 2. The pump can be installed indoors or outdoors. However, there should be sufficient space around the pump to enable efficient and easy maintenance.
  • Page 10 NPSHa should always be at least 2 feet greater than NPSHr. For NPSHr values, refer to the standard performance curve for your pump model or contact Iwaki Walchem or your distributor. 4. When using a bend on the suction side, install a straight pipe which is more than 20 inches long or 10 times as long as the suction port diameter before the suction port of the pump.
  • Page 11 6. If the diameters of the pump suction port and the suction pipe are different, use an eccentric reducer pipe. Connect the eccentric reducer pipe such that the upper part of it is level. Never use a suction pipe with a diameter smaller than that of the suction port.
  • Page 12 12. Pay close attention to the lowest level of the liquid in the suction tank so that air entrainment to the suction piping will not occur. The inflow pipe into the suction tank should be distanced from the suction pipe and positioned below the liquid surface as a means of preventing air entrainment to the suction pipe.

  • Page 13: Operation

    Wiring Use appropriate wiring materials, follow the instruction manual for the motor and abide by the local and national electrical codes. In addition, follow the instructions given below: 1. Use a motor contactor that conforms to the specifica- tions (voltage, current, etc.) of the pump motor. 2.
  • Page 14 If the direction is reversed, exchange two wires of the three-phase power wires. Note: All Iwaki Walchem MDH-(F) series pumps spin counter-clockwise when looking at the suction port of the pump. Naturally, from the motor fan side, this would be viewed as clockwise.
  • Page 15 Check/Operation Step Remarks Flow rate adjustment. Open valve slowly, paying attention to the motor Once total discharge pressure is increased to amp meter to prevent it from being overloaded shut off pressure. Open discharge valve through excessive opening of the valve. gradually to set discharge pressure to desired specification.

  • Page 16: Maintenance And Inspection

    Maintenance and Inspection Daily Inspection 1. Check that the pump operates smoothly, without generating abnormal sounds or vibration. 2. Check the level of the liquid in the suction tank, and the suction pressure. 3. Compare the discharge pressure and current measured during operation with the specifications indicated on the motor and pump nameplates to verify normal pump load.
  • Page 17 Inspection Part Inspection Points Operator Action Interval Drive magnet Is there scoring? Contact your distributor if Every 6 months assembly any abnormality is observed. Is magnet mounted normally? Reinstall magnet on motor Are hexagonal socket setscrews shaft and fasten hexagonal * Inspection loose? socket setscrews.
  • Page 18 Inspection Part Inspection Points Operator Action Interval Front casing Stain in liquid-contacting Clean. Every 3 months section. Are there any cracks? Replace if abnormality is * Inspection observed. record should be maintained. Wear or crack of front thrust Contact your distributor if ring.
  • Page 19 U P O N S H IP M E N T S T E P 0.0 78 in (2 m m ) Model MDH-(F) 400,401,422,423,425 Thickness of mouth ring Replace IM P E LLE R inches (mm) 0.315 (8) 0.236 (6) M O U T H R IN G The step between the surfaces of the mouth ring and the impeller upon shipment is 0.078...
  • Page 20 Wear Checking Steps 1. After thorough decontamination of the pump, remove liquid end assembly from motor bracket. 2. Remove front casing from the liquid end. 3. Insert magnet capsule with impeller into rear casing. 4. Measure clearance between backside of impeller shroud and face of rear casing, dimension "A" shown below.

  • Page 21: Troubleshooting

    Troubleshooting Symptom on Pump Inspection and Trouble With Discharge With Discharge Cause Valve Open Countermeasures Valve Closed Pressure gauge Insufficient Stop pump, feed priming and vacuum priming. liquid and restart pump. gauge indicate Dry Operation 'zero' Liquid Level Foot valve is Replace strainer.
  • Page 22 Symptom on Pump Trouble With Discharge With Discharge Inspection and Cause Countermeasures Valve Closed Valve Open Needle of Strainer is clogged Remove foreign matter vacuum gauge with foreign matter in strainer. indicates high and liquid passage value. is blocked. Needle of Air is trapped in Inspect installation of vacuum gauge...
  • Page 23 Trouble With Discharge With Discharge Inspection and Cause Valve Closed Valve Open Countermeasures Needle of Needle of Rotating direction Correct motor wiring to Discharge pressure gauge pressure gauge of pump/motor is reverse rotation. (Clock- quantity is indicates low and vacuum reversed.
  • Page 24 Symptom on Pump Inspection and Trouble With Discharge With Discharge Cause Valve Closed Valve Open Countermeasures Foundation is inad- Carry out installation equate. process again. Anchor bolt is loose. Retighten bolt. Suction pipe is closed or restricted. Clean, eliminate cause Cavitation is caused.

  • Page 25: Parts Description And Exploded View

    Parts Description and Exploded View * FL A N G E K IT O P T IO N A L (4 2 5 o n ly) 1 7 * 1 7 * (4 2 5 o n ly) Fig. 9 Description Description Front casing assy...

  • Page 26: Disassembly And Assembly Of Pump

    Disassembly and Assembly of Pump Caution! Since the magnets used in the pump are powerful, be careful not to catch your fingers or hand between them during disassembly or assembly. Also, keep the magnet unit away from any electronic device (or ATM card with a magnetic strip) that could be affected by a strong magnetic field.
  • Page 27 7. Extract drive magnet assembly from motor shaft, using a puller or a screwdriver as a handspike. Keep it free of all metal chips and particulate. Replacement of Bearing and Mouth Ring Bearing (MDH-(F)400/401): .0 5 9 in . (1 .5 m m ) fo r M D H -(F )4 0 0 1.
  • Page 28 4. Place and align new bearing and the rod on magnet capsule (impeller side up). Insert new bearing into magnet capsule by pressing the rod. If magnet capsule has cooled too much by this time to insert the new bearing smoothly, warm it again in the same manner as described above. 5.
  • Page 29 Reassembly Reassemble the pump by reversing the order of disassembly. Take care not to contaminate or damage the seal faces for o-rings. Tighten bolts uniformly to prevent uneven tightening. 1. Place the drive magnet assembly onto the motor shaft. • For MDH-400/401/422/423 models Motor shaft should be flush with the drive magnet boss.

  • Page 30: Spare Parts

    9. Tighten front casing bolts diagonally to avoid uneven tightening. See chart below. Front Casing Bolt Pump Model Torque lbf.in (kgf-cm) MDH-(F)400/401 104 (120) MDH-(F)422/423/425 130 (150) 10. To avoid damaging the pump: Before starting, check with a screwdriver that motor-fan rotates smoothly/ freely.

  • Page 31: 12 Weights And Dimensions

    12 Weights and Dimensions MDH-400/401/422/423 Note 1: Overall length varies with motor type and manufacturer. Model Connections Series (NPTM) 1½ x 1½ 5.51 4.33 5.67 3.86 0.47 8.75 8.27 3.74 4.53 3.19 2.00 (140) (110) (144) (98) (12) (222) (210) (95) (115) (81)
  • Page 32 MDH-(F)425 Weight & Dimensions S E E N O T E 1 Note 1: Overall length varies with motor type and manufacturer. Model Connections Series (NPTM) 2 x 1½ 10.24 9.06 5.91 10.28 12.24 10.59 5.31 5.28 3.27 2.56 .55 x 1.4 (260) (230) (150)
  • Page 33 IWAKI WALCHEM CORPORATION 5 BOYNTON ROAD HOPPING BROOK PARK HOLLISTON, MA 01746 USA TEL: 508-429-1440 FAX: 508-429-1386 E-MAIL: IWAKIWALCHEM@IWAKIWALCHEM.COM ON THE INTERNET AT WWW.IWAKIWALCHEM.COM P/N 180118.H 4/00...

This manual is also suitable for:

Mfh-f seriesMdh-400 seriesMdh-401 seriesMdh-422 seriesMdh-423 seriesMdh-425 series ... Show all

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