50 Tons & Under Man Hours 6
50-500 Tons Man Hours 30
500-1000 Tons Man Hours 50
Over 1000 Tons Man Hours 60
Special Instructions:
1. Schedule performance of this PM activity prior to seasonal start-up.
Consider the time needed to effect any required repairs.
2. Review the Procedure for "Controlling Hazardous Energy
Sources."
3. Perform cleaning of the tower in accordance with PM COOLTWR-Q before
performing this PM activity.
4. Review manufacturer's instructions.
5. Deenergize, lock out, and tag electrical circuits.
6. Review the Procedure for "Selection, Care, and Use of
Respiratory Protection".
7. Properly dispose of any debris, excess oil, and grease.
8. Check the building's asbestos management plan to see if the wet deck panels
have been tested for asbestos. If they are suspect but have not been tested,
have them tested. Manage asbestos in accordance with the plan.
Items to Check & Initial Completion:
Exterior Structural:
1. ___ Inspect louvers for correct position and alignment, missing or defective
items, and supports.
2. ___ Inspect casings and attaching hardware for leaks or defects. Check the
integrity and secure attachment of the corner rolls.
3. ___ Inspect for loose or rotten boards on wood casings. Examine from the
interior. Extensive damage may require replacement with fiberglass
sheathing.
4. ___ Inspect condition of access doors and hinges. Repair as necessary.
5. ___ Inspect the distribution system including flange connectors and gaskets,
caulking of headers on counterflow towers, deterioration in distribution
basins, splash guards, and associated piping on crossflow towers. If
configured with water troughs check boards for warpage, splitting, and
gaps.
6. ___ Examine the drain boards for damage and proper drainage. Check the
fasteners also.
7. ___ Inspect stairways including handrails, knee rails, stringers, structure
and fasteners for rot, corrosion, security and acid attack.
8. ___ Shake ladders to verify security, and check all rungs.
9. ___ Check the security, rot, and corrosion on walkway treads. Check treads,
walkways, and platforms for loose, broken, or missing parts. Tighten or
replace as necessary.
10.___ Ladders must be checked for corrosion, rot, etc. Verify
compliance with Occupational Safety and Health regulations regarding
height requirements. Check ladder security.
11.___ Check fan decks and supports for decay, missing and broken
parts, and gaps. Check the security.
12.___ Fan cylinders must be securely anchored. Check fastening
devices. Note any damaged, missing, or corroded items. Watch for wood
rot and corrosion of steel. Verify proper tip clearance between the fan
blade and interior of cylinder. Verify compliance with OSHA requirements
regarding height. Check its condition.
13.___ Apply protective coatings as needed on exterior surfaces. Be
sure rust and dirt have been removed first.
Interior Structural:
14.___ Inspect the distribution system piping for decay, rust, or
acid attack. Check the condition and tightness of connections and branch
arms. Observe spray pattern of nozzles if possible and note missing and
defective nozzles. Note condition of the redistribution system under the
hot water system.
15.___ Inspect mechanical equipment supports and fasteners for
corrosion. Wood structural members in contact with steel should be
checked for evidence of weakness. Check condition of springs or rubber
vibration absorption pads, including adjusting bolts, ferrous members, and
rubber pads.
16.___ Check valves and operating condition of fire detection
system. Check for corrosion of pipes and connectors. Check wiring of any
thermocouple installed.
17.___ Check drift eliminators and supports. Remove any clogging
debris. Replace missing blades.
18.___ Inspect tower fill for damage, ice breakage, deterioration,
and misplaced, missing, or defective splash bars.
19.___ Examine interior structural supports. Test columns, girts,
and diagonal wood members for soundness by striking with a hammer. A high
pitched, sharp sound indicates good wood, whereas a dull sound indicates
soft wood. Probe rotted areas with a screw driver to determine extent of
rot. Look for iron rot of metal fasteners in contact with wood. Check
condition of steel internals. Check condition and tightness of bolts.
20.___ Inspect the nuts and bolts in partitions for tightness and
corrosion. Look for loose or deteriorated partition boards. Note if
partitions are installed so as to prevent wind milling of idle fans. Make
sure wind walls parallel to intake louvers are in position. Boards or
transite members should be securely fastened. Check condition of wood or
steel supports for rot and corrosion.
21.___ Check wooden cold water basins for deterioration, warps,
splits, open joints, and sound of wood. Inspect steel basins for
corrosion and general condition. Inspect concrete basins for cracks,
breaking joints, and acid attack.
22.__ Check all sumps for debris, condition of screens,
antiturbular plates, and freely operating drain valves.
Mechanical:
1.___ Check alignment of gear, motor, and fan.
2.___ Inspect fans and air inlet screens and remove any dirt or debris.
a.___ Check hubs and hub covers for corrosion, and condition of attaching
hardware.
b.___ Inspect blade clamping arrangement for tightness and corrosion.
3. Gear box
a.___ Clean out any sludge.
b.___ Change oil. Be sure gear box is full to avoid condensation.
c.___ Rotate input shaft manually back and forth to check for backlash.
d.___ Attempt to move the shaft radially to check for wear on the input
pinion shaft bearing.
e.___ Look for excessive play of the fan shaft bearings by applying a force
up and down on the tip of a fan blade. Note: Some output shafts have
a running clearance built into them.
4. Power transmission.
a.___ Check that the drive shaft and coupling guards are installed and that
there are no signs of rubbing. Inspect the keys and set screws on the
drive shaft, and check the connecting hardware for tightness. Tighten
or install as required.
b.___ Look for corrosion, wear, or missing elements on the drive shaft
couplings.
c.___ Examine the exterior of the drive shaft for corrosion, and check the
interior by tapping and listening for dead spots.
d.___ Observe flexible connectors of both ends of the shaft.
e.___ Inspect bearings, belts, and pulleys for excessive noise, wear or
cracking, alignment, vibration, looseness, surface glazing, tension.
Replace or repair as required.
5.___ Check water distribution. Adjust water level and flush out troughs if
necessary. Check all piping, connections, and brackets for looseness.
Tighten loose connections and mounting brackets. Replace bolts and braces
as required.
6.___ Check nozzles for clogging and proper distribution.
7.___ Inspect keys and keyways in motor and drive shaft.
Electrical:
1.___ Check electric motor for excessive heat and vibration. Lubricate all motor
bearings as applicable. Remove excess lubricant.
2.___ Inspect fused disconnect switches, wiring, conduit, and electrical controls
for loose connections, charred or broken insulation, or other defects.
Tighten, repair, or replace as required.
3.___ Remove dust from air intakes, and check for corrosion. Check TEFC motors
for conditions of air passages and fans.
4.___ If there is a drain moisture plug installed, see if it is operational.
5.___ Check amps and volts at operating loads, recommend pitching of fan blades
to compensate.
6.___ Look for corrosion and security of mounting bolts and attachments.
Tools & Materials:
1. Standard Tool kit.
Plus Pipe wrenches to 24"
Tubing cutters
Flaring tool
Small acetylene outfit
Packing tool kit and packing
3/4" socket set
Crescent wrenches to 14"
2. Protective coating, brushes, solvent, etc. Consult the Material Safety Data
Sheets (MSDS) for hazardous ingredients and proper personal protective
equipment (PPE).
3. Manufacturer approved lubricants. Consult the MSDS for hazardous ingredients
and proper PPE.
5. Cleaning tools and materials. Consult the MSDS for hazardous ingredients and
proper PPE.
6. Respirator.
7. Safety goggles
8. Work gloves
9. OSHA approved ladders of appropriate size or scaffolding. Check ladder for
defects. Do not use defective ladders.
10. Amp probe and volt meter.
11. High pressure washer.
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