FMC Technologies W11 - Page 47

Doc No: OMM50002312
Rev: C Page 47 of 54
Subject to contractual terms and conditions to the contrar
y, this document and all the information contained herein are the confidential and exclusive
property of FMC Technologies, and may not be reproduced
, disclosed, or made public in any manner prior to express written authorization by FMCTI.
Reduced
packing or
piston cup
life
-Highly abrasive particles in fluid
-Packing or piston cups run dry
-Incorrect packing or cups for fluid type
-Inadequate packing lubrication
-Pump was run dry for extended time
-Plunger (or rod) misaligned to stuffing box
-Worn plunger or cup holder
-Worn cylinder liner bore
-Packing gland too tight (adjustable)
-Packing gland too loose (adjustable)
-Too much packing in box
-Broken or weak spring
-Install strainer or filter
-Correct problem & replace packing or cup
-Change to correct packing or cup
-Correct problem and replace packing
-Correct problem and replace cups
-Correct alignment
-Replace plunger or cup holder
-Replace cylinder liner
-Properly adjust gland nut
-Properly adjust gland nut
-Correct installation problem
-Replace spring
Reduced
valve life
-Highly abrasive particles in fluid
-Cavitation damage
-Air leaking into suction line or stuffing box
-Suction inlet insufficiently submerged
-Relief valve or bypass piped to suction
-Valve damaged by improper installation
-Install strainer or filter
-Correct problem and replace damaged valves
-Correct problem and replace damaged valves
-Increase submergence or baffle to stop vortex
-Pipe back to reservoir (tank)
-Replace damaged components
Cracked
fluid
cylinder or
broken
fluid end
bolts
-Discharge pressure too high
-Hydraulic shock (cavitation or entrained air)
-Discharge valve stuck closed
-Fluid freezing in fluid cylinder
-Material or manufacturing defect
-Bolt or nut not properly torqued
-excessive piping loads on fluid end
-Reduce system back pressure or relief valve
-Correct piping system problem
-Replace damaged components
-Change procedure to drain fluid when cold
-Replace defective component
-Replace fluid cylinder and properly torque
-Add supports to piping
Broken
crankshaft
or
connecting
rod
-Discharge pressure too high
-Suction pressure too high
-Fluid freezing in fluid end
-Hydraulic shock due to cavitation
-Material or manufacturing defect
-Reduce system back pressure or relief valve
-Reduce suction pressure or plunger diameter
-Change procedure to drain fluid when cold
-Correct piping system problems
-Replace defective components
Power end
oil is
contaminat
ed
-Extended operation with failed piston cup
-Hi-press wash wand near breather or seals
-Deflector shields are missing or damaged
-Crosshead extension seals damaged
-Excessive capacity in liner wash system
-Improperly adjusted liner wash nozzle
-Replace piston cup and improve monitoring
-Provide shields to protect breather and seals
-Repair or replace deflector shields
-Replace oil seals
-Reduce capacity in liner wash system
-Adjust liner wash nozzle