Iwaki Walchem Magnetic Drive Pump Mdh-(F) Series Instruction Manual
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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 IWAKI WALCHEM MODEL MDH-F HEAD (FT.) CAPACITY (GPM) HP 60 Hz. RPM SERIAL NO. HOLLISTON, MA 01746 Fig. 1 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. 1 n IWAKI WALCHEM MAGNETIC DRIVE PUMP MDH-(F) SERIES INSTRUCTION MANUAL IWAKI WALCHEM Corporation Table of Contents 1 Unpacking and Inspection.............................................................................................................. 1 2 Model Identification Guide ............................................................................................................ 2 3 Specifications ................................................................................................................................. 3 4 Handling ........................................................................................................................................ 5 5 Installation, Piping and Wiring ...................................................................................................... 7 6 Operation...................................................................................................................................... 11 7 Maintenance and Inspection......................................................................................................... 14 8 Troubleshooting ........................................................................................................................... 19 9 Parts Description and Exploded View.......................................................................................... 23 10 Disassembly and Assembly of Pump ........................................................................................... 24 11 Spare Parts.................................................................................................................................... 28 12 Weights and Dimensions ……………………………………………………………………….29 2 Model Identification Guide 12 3 4 5 6 MDH-F 400 F V G -D 1. Casing Material MDH: Glass fiber reinforced polypropylene (GFRPP) MDH-F: Carbon fiber reinforced fluoroplastic (ETFE) 2. Pump Size Suction × Discharge Suction × Discharge 400: 1½" NPTM 1½" NPTM 422: 2" NPTM 1½" NPTM 401: 1½" NPTM 1½" NPTM 423: 2" NPTM 1½" NPTM 425: 2" NPTM 1½" NPTM 3. Bearing System, materials of construction Pump Series MDH Series MDH-F Series Pump Size 400 - 401 - 422 - 423 - 425 400 - 401 - 422 - 423 - 425* Bearing Option C R S A C F Bearing Carbon PTFE Carbon Carbon Spindle Alumina Alumina 316 S.S. Alumina Alumina High Purity Front Thrust Ceramic Ceramic 316 S.S. Ceramic Ceramic Alumina Rear Thrust Carbon Ceramic Mouth Ring PTFE Dry Run Capability YES NO YES NO YES YES (See No. 6) * F425 available in "FVG" bearing system only 4. O-Ring Material V: FKM (Viton® ) E: EPDM A*: Aflas® K*: Kalrez® * Special order only 5. Impeller 400 401 422 423 425 MDH 6: ½ hp 1 hp 2 hp 3 hp 5 hp Series 7: ¾ hp 1½ hp ---- ---- MDH-F X: ---- ---- 2 hp 3 hp ---- Series G: ¾ hp 1½ hp ---- ---- 5 hp 6. Dry Run Capability (Bearing system specific. See also No. 3) -D: Dry run available -E: Dry run not available n 2 3 Specifications Maximum Impeller Specific*4 Flow Maximum Motor Connections Model Code Gravity Capacity Head/TDH Output Suction & Discharge Series (Size) Capability (GPM) (FT) (HP) (NPTM) MDH-400 6 72 37 ½ 7 66 42 ¾ 1½ x 1½ MDH-401 6 1.10 85 66 1.0 7 92 70 1½ *5 MDH-422 6 95 79 2.0 2 x 1½ MDH-423 6 120 78 3.0 MDH-425 6 1.20 158 100 5.0 MDH-F400 G 1.10 66 42 ¾ 1½ x 1½ MDH-F401 G 92 70 1½ MDH-F422 X 1.20 95 80 2.0 2 x 1½ MDH-F423 X 120 77 3.0 MDH-F425 G 158 100 5.0 Notes: 1. Rated performance (head/capacity) represents the maximum discharge head/capacity measured with water at 70° F (21° C). 2. Liquid temperature range: 32 - 176° F (0 - 80° C) Ambient temperature range: 32 - 104° F (0 - 40° C) 3. Slurry: Standard pumps are not suitable for slurry applications. Only MDH-F(AV) models are capable of handling applications with a slurry hardness 80Hs or below, grain size maximum 2 mil, maximum density 5% wt. Contact Iwaki Walchem or your distributor for details. 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. 5. The MDH-401-7, when coupled to a 1½ HP motor should use a flywheel drive magnet assembly, part number MFL1361. Note that the MDH-(F)401 with a 1 HP motor does NOT require the flywheel drive magnet. 3 n n Materials of Main Components RETAINER RING (F425 ONLY) DRIVE MAGNET* FRONT CASING BEARING REAR THRUST (CONICAL) BASEPLATE FRONT THRUST MOUTH RING IMPELLER REAR CASING O-RING MAGNET CAPSULE SPINDLE Fig. 2 Model Series MDH MDH-F Parts CV RV SE AV CV FV Casings & Impeller Glass fiber-filled polypropylene Carbon fiber-filled ETFE Magnet capsule Glass fiber-filled polypropylene Carbon fiber-filled ETFE Spindle Alumina ceramic 316 SS Alumina ceramic 99.8% Alumina ceramic Bearing Carbon PTFE Carbon Alumina High density carbon ceramic Mouth Ring PTFE PTFE Thrust Ring Alumina ceramic 316 SS Alumina ceramic 99.8% Alumina ceramic Drive magnet Ferrite/Neodymium* * Ferrite in 400/401 - Neodymium in 422/423/425 n 4 4 Handling 1. Dry run operation, unless using a "-D" model Dry run operation of the pump may cause damage to the pump internally. The internal bushings used in the MDH-(F) series pump are lubricated and cooled by the fluid being pumped. If the pump is unavoid- ably or accidentally operated dry, with no obvious damage, allow the pump to cool down for a minimum of one hour before attempting to restart. Do not allow fluid to enter the pump cavity until the pump has cooled down. Sudden or rapid introduction of a cold fluid may cause damage to the bearing system. A dry run protection device is recommended for the prevention of damage when dry pump operation is antici- pated. "-D" Models Most MDH-(F) models are designed to tolerate brief or intermittent dry run operation, they are identified by a "-D" at the end of the model number. These models can tolerate dry run conditions for up to one hour. Longer dry run periods, or frequent dry running may result in premature wear of the bearing sur- faces. This can rapidly affect the standard clearances of the rotating elements inside the pump. These pumps are designed to reduce the likelihood of cracking resulting from sudden cooling with liquid imme- diately after dry run operation. 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. "-E" Models Pumps identified with "E" at the end of the model identification cannot endure dry running opera- tion. 2. Starting and Stopping Pay close attention to the following points to avoid water hammer upon starting and stopping pump operation. Extra attention is required when the discharge piping is very long. Starting Prior to starting the pump, make sure that the power is turned off. Then carry out priming to fill the pump cavity with liquid. Close the cocks of any pressure or vacuum gauges to prevent damage from sudden pressure changes. Open only when taking measurements. Next, close the valve on the discharge side. Now you can turn the power on and start up the pump. Run the motor momentarily to check the direction of motor rotation. The motor should run in the direction indicated by the arrow sealed on the pump. If the direction is reversed, exchange two wires of the three-phase power wires. When the pump has reached full speed and line pressure is stable, the discharge valve can be opened until the desired pressure setting is obtained. Stopping When stopping the pump, first close the discharge valve gradually. When it is completely closed, turn off the power switch so that the pump stops. Never stop the pump suddenly by quickly closing a valve (i.e., solenoid or hydraulic valves). ! Caution Quick valve closure may cause water hammer which may result in severe damage to the pump. 5 n Max. Pressure Rating 3. Maximum system pressure rating Pump Size PSI kgf/cm2 400 23 1.6 The table on the right shows the maximum pressure rating of each model. Take care 401 34 2.4 that the system pressure does not exceed the 422 43 3.0 maximum pressure rating. 423 43 3.0 425 57 4.0 4. Handling of slurries In general, slurries should not be handled. However, the MDH-F(AV) models or custom order models with 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. 5. Influence of specific gravity on pump performance. The performance of the MDH-(F) pumps does not change