Flowserve Durco Mark 3 ISO Frame Mounted Manual de usuario descargar pdf (Pagina 36)

DURCO MARK 3 ISO FRAME MOUNTED ENGLISH 85392719 12-14

Page 36 of 52 flowserve.com

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

P u mp ov e r hea ts an d se i z e s



Be a ri n gs ha v e s h o r t l if e



P u mp vi b rat e s o r i s n oi s y



M ech a n ic a l s ea l h a s s ho r t l i f e



M ech a n ic a l s ea l l e a k s e x c e s s i vel y



P u mp req u ir e s e xc e ss i ve po w e r



P u mp lo s es p ri m e a ft e r s ta r tin g



I n suf f i c i en t p r e s s ur e d e v e lo p ed



I n suf f i c i en t c a p a c i t y d e li ver ed



P u mp do e s n o t d eli v e r l i q u id



POSSIBLE CAUSES

POSSIBLE REMEDIES

A. System troubles



Pump not primed or filled with liquid.

Check complete filling.



Pump or suction pipe not completely filled with

liquid. (Where not a self-priming arrangement.)

Vent and/or prime.



Suction lift too high or level too low.

Check NPSH

> NPSH

, proper submergence,

losses at strainers and fittings.



Insufficient margin between suction pressure and

vapor pressure.



Excessive amount of air or gas in liquid.

Check and purge pipes and system.



Air or vapor pocket in suction line.

Check suction line design for vapor pockets.



Air leaks into suction line.

Check suction pipe is airtight.



Air leaks into pump through mechanical seal,

sleeve joints, casing joint or pipe lugs.

Check and replace faulty parts.

CONSULT FLOWSERVE.



Foot valve too small.

Investigate replacing the foot valve.



Foot valve partially clogged.

Clean foot valve.



Inlet of suction pipe insufficiently submerged.

Check out system design.



Speed too low.

CONSULT FLOWSERVE.



Speed too high.

CONSULT FLOWSERVE.



Total head of system higher than differential head

of pump.

Check system losses.

Remedy or CONSULT FLOWSERVE.



Total head of system lower than pump design head.



Specific gravity of liquid different from design.

Check and CONSULT FLOWSERVE.



Viscosity of liquid differs from that for which

designed.



Operation at very low capacity.

Measure value and check minimum permitted.

Remedy or CONSULT FLOWSERVE.



Operation at high capacity.

Measure value and check maximum permitted.

Remedy or CONSULT FLOWSERVE.

B. Mechanical troubles



Misalignment due to pipe strain.

Check the flange connections and eliminate strains

using elastic couplings or a method permitted.



Improperly designed foundation.

Check setting of baseplate: tighten, adjust, grout

base as required.



Shaft bent.

Check shaft runouts are within acceptable values.

CONSULT FLOWSERVE.

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Flowserve Durco Mark 3 ISO Frame Mounted Manual de usuario Pagina 36

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