MTHPUMPS 140 SERIES Manual Download Page 2

Section 

140 • 180

 Page 501

Dated 

October 2011

140 • 180 SERIES

1.

General Instructions

HORIZONTAL FLEXIBLE COUPLED 

PUMPS

A. 

Inspection of Equipment

B. 

Storage

C. 

Placing Stored Pumps Into Service

D. 

Application Considerations

E. 

Recommended Spare Parts

When properly installed and given 

reasonable care and maintenance, 

regenerative turbine pumps should 

operate satisfactorily for many years.  

Because of the high differential 

pressures expected in a regenerative 

turbine pump, close running clearances 

are used to reduce internal losses.  

Abrasive particles, even microscopic 

ones, in high enough concentrations, 

can open up the close clearances 

between internal components.  For 

critical services it is recommended that 

you keep an identical pump for stand-by 

use.

1A Inspection of Equipment

Immediately upon receipt of the 

shipment, inspect the equipment for 

damage or missing components. 

Check the shipping manifest and 

report any damage or shortage to the 

Transportation Company’s local agent. 

Inspect the crate and any wrapping 

material before discarding. Parts or 

accessories are sometimes wrapped 

individually or fastened to the skid. 

Put the instructions that came with the 

shipment in a safe place where they will 

be available to those who will be using 

them for installation and service.

1B Storage

If the pump is to be stored before use, 

it should be inspected as described 

in 1A, recrated and stored in a dry 

location. Standard shipping containers 

are not suitable for outdoor storage. 

In some areas, it may be necessary 

to cover the pump’s exterior surface 

with oil or other rust inhibiting coating. 

All units are tested at the factory with 

a water/corrosion inhibitor solution, 

some of which will remain inside the 

pump upon receipt. If units are flushed 

out prior to storage, this inhibitor will 

be removed and proper care must be 

taken to prevent product deterioration 

from improper storage.

For storage beyond 30 days, a 

corrosion inhibiting protective fluid 

should be added to the internal pump 

cavities. Fluids used in the pump should 

be selected for compatibility with pump 

materials. This is very important when 

optional seal and gasket materials have 

been used. Protective caps on the inlet 

and outlets should also be used. Caps 

alone are not sufficient protection.

1C Placing Stored Pumps Into 

Service

Special care must be taken when 

placing stored pumps into service. First 

clean the outside and flush out the 

inside with a process compatible fluid. 

Try to turn the pump using the coupling. 

Applying torque to the motor fan blades 

is not recommended. If the impeller 

does not break loose immediately, fill 

the pump with a process compatible 

fluid and try again in a few hours.

If this fails, read the disassembly-

reassembly instructions. With an 

understanding of which are the bolts 

used to clamp the entire assembly 

together, loosen each of them exactly 

three full turns. After filling the pump 

with water again, up to 50 foot pounds 

of torque may be applied to the coupling 

without fear of ruining the impeller 

vanes. It should begin to turn well 

before this force is reached. Continue 

turning the pump while the various 

fasteners are returned to their original 

positions.

If the unit still won’t turn over, DO 

NOT apply further force. Refer to the 

Disassembly/Reassembly Instructions 

in Section 5 to determine the cause of 

the problem.

1D Application Considerations

1D1 Electrical Wiring

All electrical equipment and wiring 

should conform to local and National 

Electrical Codes.  Use the motor 

manufacturer’s instructions for 

connecting the motor.  Note the correct 

rotation and wiring diagrams on the 

assembly.  Make sure the motor rotation 

and speed matches that required for the 

pump.

1D2 Construction Materials

Wile it is reasonable to assume that 

good judgement has been used in 

selecting all the materials in the pump 

for compatibility with process fluids, 

actual conditions sometimes vary from 

original specifications.  Also, typical 

material selection charts do not consider 

all the temperature, pressure, and fluid 

variables.  The customer’s engineer 

should be consulted for final judgement 

on the best materials for critical process 

applications.

1D3 Valves

The first valve to be considered for a 

regenerative turbine pumping system 

should be a pressure relief valve.  

Because this type of pump has a 

horsepower requirement similar to 

that of a positive displacement pump, 

constantly rising hp as pressure 

increases, a relief valve can be 

effectively used to limit horsepower.  

This is helpful when a non-overloading 

motor is specified.  It can be of 

critical importance if the system flow 

rate can vary widely.  

There are 

almost no circumstances where 

a flow modulating valve will work 

successfully in a regenerative 

turbine pumping system.  The steep 

pumping characteristic, typical 

of these pumps, produces very 

large pressure changes with small 

variations in flow rate.  As a result, 

the modulating flow from the valve 

introduces sharp pressure shock 

waves that shorten pump life and 

may cause damage to other pieces 

of equipment in the system.

A swing check valve is recommended 

in the suction line even  when the pump 

inlet is only slightly higher than the fluid 

source.  It should be the same size 

as the pump inlet or sized based on 

reasonable fluid friction losses.

A foot valve is recommended when 

lifting fluid from a sump.  This will save 

wear and tear on any pump, even those 

equipped with self- priming capability.

A Y-Strainer is recommended 

immediately ahead of the pump on 

any newly constructed system.  This 

is advisable due to the probability 

that foreign material large enough to 

damage pump clearances may remain, 

even though the piping has been 

flushed.

Valves in the outlet piping of a 

regenerative turbine pump should 

always be open as far as possible when 

the pump is started.  This will reduce the 

start-up load on the pump and motor.  

Summary of Contents for 140 SERIES

Page 1: ...Section 140 180 Page 500 Dated October 2011 97 4670 01 588 140 180 SERIES Pump Manual HORIZONTAL FLEXIBLE COUPLED ...

Page 2: ...ether loosen each of them exactly three full turns After filling the pump with water again up to 50 foot pounds of torque may be applied to the coupling without fear of ruining the impeller vanes It should begin to turn well before this force is reached Continue turning the pump while the various fasteners are returned to their original positions If the unit still won t turn over DO NOT apply furt...

Page 3: ...e objectionable harmonics Adequate support for the inlet and discharge piping is important for noise reduction 1D7 Freezing When ambient temperatures drop below the freezing point of the fluid in a pump consideration should be given to heating insulating or draining the pump If you choose to drain the pump and it will only be for a short period first Ps Pvp sp gr remove the drain plugs then drain ...

Page 4: ... wedges having a small taper Refer to Figure 2 1 a Place shims close to the foundation bolts Refer to Figure 2 2 b Also place shims close to where the greatest weight is located 4 Check the baseplate for distortion a Place a straightedge along the baseplate to determine if it is distorted b Adjust the shims until the baseplate is not distorted 5 Use a section of pipe to determine if the inlet and ...

Page 5: ...doweled to the baseplate 2E Piping 2E1 Alignment It is important that all piping be lined up and not forced into place It is recommended that you begin piping at the pump If the lines are ended at the pump particularly if the last piece is cut a little too short or long the pump will be forced to meet the pipe and strain or distortion will result 2E2 Piping Support Never allow the pump to support ...

Page 6: ...ydraulic center Normal operation may be expected 3E Cooling Water When the pump is used to transfer hot fluids consideration should be given to cooling the seals and or selecting materials that will give satisfactory seal life The actual temperature at the seal faces the most critical area will always exceed the surrounding fluid temperature Seal flush taps or lines must be ordered from the factor...

Page 7: ...Bearing Retaining inlet end only 17 Shaft 5 Stud Bearing Arm 18 Guide Rod 6 O Ring Medium Seal Cup 19 Thru Bolt Casing 7 O Ring Large Casing 20 Nut Casing and Bearing Arm 8 O Ring Small Guide Rod 20 5 Jam Nut Bearing Arm 9 Channel Ring Right outer end ring 21 Flinger 10 Channel Ring Left inlet end ring 22 Drain Plug 11 Impeller Turbine 23 Key Impeller and shaft 12 Seal Rotating Element Unbalanced ...

Page 8: ...rted 6 Using a soft mallet loosen the outboard cover 1 by tapping lightly around the outside edge Slip the cover off the guide rods 18 being careful not to bend them 7 The seal cup 2 may be removed by tapping it towards the inside of the cover 1 Using a wooden block or dowel for this operation rather than something metal will prevent damage to the seal cup or seal seat 12 5 8 If the seal seat 12 5...

Page 9: ...NSPECTION OF COMPONENTS Thoroughly clean all parts All components should be examined for wear and corrosion Replace parts that show visible wear If the pump was no longer producing sufficient pressure or capacity it is a safe assumption that clearances between rings and impeller exceed an acceptable amount At least the impellers should be replaced in this case If the total side running clearance f...

Page 10: ... into place with the water channel facing up refer to figure 4 8 This time however place the large inlet opening in the five o clock position By locating successive stages 180 degrees from the last hydraulic loads are radially balanced 12 Add another Key 23 and an impeller 11 13 Put another O ring 7 into place 14 To complete the second stage assembly install a right hand channel ring 9 facing down...

Page 11: ...26 Tap a bearing arm 3 over the bearing and retain with two nuts 20 They should be finger tight only 27 Remove the pump from the support blocks and place it on its feet 28 Insert the four thru bolts 19 and install nuts 20 Tighten all six nuts evenly until about one full turn before being fully torqued Return the assembly to the wood blocking with its shaft extension up Install the seal rotating el...

Page 12: ...e suction lift Relocate pump supply tank or both to minimize suction lift 5 Wrong direction of rotation Compare pump rotation with arrow on pump Standard pumps rotate in a clockwise direction when looking at the shaft extension end or from the motor end on close coupled pumps Reverse two leads on a three phase motor to change rotation Check motor nameplate for single phase operation 6 Clogged suct...

Page 13: ...nsumption 6 Pump not properly adjusted Loosen all nuts on pump exactly one turn Follow the instructions in Section 5F Testing and Final Adjustments for repositioning fasteners 5F Pump Vibrates Or Is Noisy 1 Pump and motor are misaligned Follow the instructions in Section 2D Alignment for proper alignment 2 Insecure mounting Follow instructions in Section 2 2B Foundation 3 Piping load on pump Insta...

Page 14: ...ow pages or by contacting MTH Pumps at 401 W Main St Plano IL 60545 Phone 630 552 4115 Fax 630 552 3688 6B Repair Services Repair service for an MTH pump should be obtained from the company through which it was purchased In the event this is not possible the name and phone number of a nearby MTH representative or distributor may be obtained by contacting MTH Pumps In the event that it is necessary...

Page 15: ...arked with the Return Goods Authorization RGA number provided by MTH and shipped freight prepaid and allowed F O B the MTH factory at Plano Illinois USA MTH may in its sole discretion deny any warranty claim if shipping damage any attempted disassembly or any other action outside of MTH s control impairs MTH s determination of the existence of or cause of a claimed failure Notwithstanding anything...

Page 16: ...Section 140 180 Page 515 Dated October 2011 97 4670 01 588 ...

Reviews: