MTH PUMPS T31 Series Manual Download

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Page 508

Figure 4-2 Standard Seal Consrtuction

Figure 4-3 External Seal Flushing

Figure 4-4 Internal Seal Flushing

.625 DIA.

1.047 .625 DIA.

.625 DIA.

SEAL .625 DIA.

.625 DIA.

O.D.

1.250

DIA

BORE

.547 W.H.

Figure 4-1

Seat

Washer

Diaphragm

Spring

Holder

Summary of Contents for T31 Series

Page 1: ...T31 SERIES Section T31 Page 501 Dated October 2010 97 4621 01 588 Pump Manual HORIZONTAL CLOSE COUPLED FLEXIBLE COUPLED ...

Page 2: ...ft The pump should turn before 50 foot pounds is reached If you are successful at breaking loose the unit continue turning the pump while retightening the thru bolts to their original positions If the unit still won t turn over DO NOT apply further force Refer to the Disas sembly Reassembly Instructions in Section 5 to determine the cause of the problem 1D Application Considerations 1D1 Electrical...

Page 3: ...ping unit is sup ported free of building structures by the use of vibration isolators ﬂexible piping and conduit connections Elastomer type couplings are the best choice to separate motor noises from the ﬂuid and piping structure 1D7 Freezing When ambient temperatures drop below the freezing point of the ﬂuid in a pump consideration should be given to heating P NPSH 2 31 H P NPSH 2 31 H NPSH 2 31 ...

Page 4: ...re not rigid enough to maintain alignment of the unit The pump foundation is used as a support for the baseplate to maintain align ment of the unit If the baseplate is to be grouted to the foundation it is only necessary to embed the edges It is unnecessary to completely ﬁll under the baseplate DO NOT grout the unit to the foundation until it has been properly aligned The foundation must be a perm...

Page 5: ... expansion and contraction particularly in long runs of straight pipe Fasten Unit Securely to Founda tionin Level Position Gate Valve Check Valve Eccentric Reducer Increaser Vent Plug Drain Pipe Supports Union Union and Spool Piece Combination Foot Valve and Strainer Area of Foot Valve 1 1 2 Times Pipe Area Areaof strainer 3 to 4 Times Pipe Area Pipe Hangers Suction Reservior Long Suction Lines to...

Page 6: ... so equipped 4 This should break the impeller loose without damage unless for eign material has entered the pump 5 If possible spin the pump or oper ate with minimal or zero discharge pressure while the thrubolts are retightened exactly exactly one turn This will ﬂush residue from the close ﬁtting impeller surfaces Because of the large areas of close ﬁtting surfaces inside these pumps it takes onl...

Page 7: ...o drain it Follow the instructions for long term storage Section 1 1B Stor age After any prolonged stoppage turn the pump over by hand before restarting to be sure it is free T31 SERIES 4 Maintenance CLOSE COUPLED PUMPS A Seals B Flushing Lines C Cooling Water D Lubrication 4A Seals Mechanical seals are used in MTH Pumps to eliminate the maintenance that is normally associated with packing boxes T...

Page 8: ...al Seal Flushing Figure 4 4 Internal Seal Flushing 625 DIA 625 DIA 1 047 625 DIA 1 047 625 DIA SEAL 625 DIA SEAL 625 DIA O D 1 250 DIA BORE 547 W H 547 W H Figure 4 1 Seat Seat O Ring Washer Washer Fexible Diaphragm Diaphragm Retainer Drive Ring Spring Spring Holder ...

Page 9: ... the motor bracket 1 forward on the shaft to move the rotating element high enough to be removed by hand Using tools on the rotating element may damage the rotating element or the seat Take precautions to keep the rotating element clean if it is to be reused 7 Next remove the motor bracket 8 To remove the seat 125 Refer to Figure 5 1 Place the motor bracket face down on a clean ﬂat surface Look in...

Page 10: ...e should not be required or used to install the impeller in the correct position The impeller hub should be facing out away from the motor bracket Refer to Figure 5 2 7 Next rotate the impeller by hand the impeller should move freely 8 Place the large O ring 7 into the outside O ring groove in the motor bracket Place the two 2 smaller O rings 8 into the smaller O ring grooves 9 Place the cover 2 o...

Page 11: ...be performed on an elevated workbench whenever pos sible The disassembly and reassembly pro cedures are broken into two sections covering the following units 5B Disassembly of the P2 Unit 5D Reassembly of the P2 Unit An exploded view of the unit Figure 5 3 is provided for referencing the numbers in the following procedures i e ﬂinger 21 T31 SERIES Service 5 NAME DESCRIPTION PART NO QTY Bearing Ped...

Page 12: ...he shaft and the bear ings New bearings New bearings or at least cleaned and regreased bearings are recom mended Check the shaft for galling pitting and corrosion Surface corrosion on the pump portion of the shaft must be removed so the seals will slide freely during assembly The shaft diameter should be no smaller than 002 below the nominal fractional seal sizes Remove any nicks or burrs which ma...

Page 13: ...ng and Final Adjustments 1 Check to be sure that the rotating assembly turns freely Turn the shaft by hand If it is tight or rough spots are encountered it is likely that at least one of the bearings was damaged during disas sembly assembly operations and will have to be replaced 2 Look to make sure that the lip seals on the bearings are positioned properly in their grooves Correct if necessary As...

Page 14: ...arting 1 Leak in suction line Fill the system with ﬂuid and hydro statically test Tighten connections or replace leaky components 2 Air entering pump through O rings Hydrostatically test the pump looking for leaks Replace faulty O rings 3 Insufﬁcient NPSH or too much suction lift Relocate pump supply tank or both to improve inlet conditions Increase suction pressure Reduce ﬂuid tem perature Select...

Page 15: ...rough bolts has no effect 6H Seal Leakage 1 Worn seat or rotating element Seals will last many years operating on cold clear water or other ﬂuids with reasonable lubricity Particles even microscopic increase normal wear rates Temperatures near the ﬂuid s boiling point can reduce lubricity which in turn increases wear Some chemicals will erode the seal faces or plate out on the faces producing an a...

Page 16: ...Warranty Period that the products manufactured by it will be free from defects in material and workmanship MTH will correct defects in material or workmanship which may develop in its products under proper or normal use during the Warranty Period and under the conditions of this Warranty This Warranty does not extend to anyone except the original consumer pur chaser Damage to the product due to im...

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