Page 39 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

24 Major Process Euipment MainteMlrce and Repair

Table 1-1
Recommended Preventive Maintenance Checks
Centrifugal Pumps and Drivers
lntenmls Routine
Daily -Check ump for noisy bearing & cavitation noise.
Dally -Check gearing oil for water, discoloration & wntamination.
Daily -Feel all bearings for temperature.
Monthly -Add oil !f required.
Monthly -Clean oiler bulbs & level windows as required.
Fall & -Do seasonal oil changeout if required by Lube Guide.
Summer
Daily -Inspect bearings & oil rings through filling orb. Wipe bearlng covers clean.
Monthly --Ascertain that oil level is correct distance #om shaft center line. Adjust oiler as required.
Daily -Check for oil leaks at gaskets, plugs ,& fittln 8.
Vz Year -Machines not runnina-standby service:-&erM bearing houslng to bottom of shaft & re
tate several turns by and to mat shaft 8 bearings with oil.
Drain back down to ra-establlsh roper level.
Dally -Self flushed pumps-hand chec! Rush line temperature to determine flow through line.
External flushed-pumps-determine if flow indicator & needle valve adjustment is (XK.
Daily -Determine if mechanical seal condttlon is normal.
Daily -Check any water cooling for effective operation. Hand test temvure differential across
coolers, jackets & exchangers. Disassemble & clean out as required.
Fell -Where cooling water is decommissioned, ensure that no water remains in jackaa, coolen, or
piping.
Fat! --Inspect for damaged or missing insulation.
Daly -Check for opratlon of heat tracin
-Thorou hly ins ect disc coupling sbr siqns of wear & cracks In laminations. TI Men bolts.
-Dial indcator Jeck coupling alignment in coupled condition. Use special coupflng indicator
clamps where possible. Ensure that thermal rowth allowance is correct.
Yearly -Wfih indicator clamped to coupling, depress 8 llft on each coupling and note dial indicator
change. Determine if deflection is normal for this machine.
Yearly -Dial indicator check axial float of pump B driver shafts in similar manner.
1h Year -Apply llght coat of Rust Ban to exposed machlned surfaces to prevent rust & corrosion.
Monthly -Clean out debris from bearing brackets. Drain hole must be open.
Daily -Determine if .steam leakage at packing & valves is normal.
Daily -Check for leaks at pressure casing & gaskets.
Determine if steam traps are operating properly-no continw bbw & no- in casing or
drain lines.
%! Mar -Clean & oil governor Ilnkaw & valve stems.
Yearly -Remove turbine sentinel valve. Shop test & adjust to proper dng.
Yearly --Inspect tri va!ve & thmttle valve stems & linkages for wear. Check overspread mechanism
for wear. Jurbine not running.)
Yearly -Remove mechanlcal governor cover & inspect flyball seats, sprlng, bearing & plunger for
wear.
Marly -Uncouple from pump & overspeed turbine. Ensure that trip valve will stop turbine wlth steam
supply valve (throttle valve fully open. Compare trlpplng speed with pmvious record. Adjust
trip mechanism B repeat linecessary. Follow manufacturer's instructlona when making ad-
ustments.
narly -L here process permits, test run turbine coupled to pump. When not posslble, run uncou-
pled. With tachometer-verify proper governor operation & control. Determlne if hand
(booster) valves are completely cld when not requlred to carry load. This influences
steam economy.
rh %eu --Exerclso overspeed trip & valve steam linkage on turblnes not running.
Yearly -Change oil in hydraulic governors.
Monthly -Determine if hydraulic governor heater is wodcing.
Monthly -Check for proper oil level B leaks at hydraulic gwemor. Check for oll leaks at lines. fittings 6
er piston.
Monthly -&ace guard8 (repair if required).
Monthly -Determine if pump unlt requires general cleaning by others.