ASME POM 102-2014 (R2019) pdf download

ASME POM 102-2014 (R2019) pdf download.Operating Walk downs of Power Plants.
1-9 WOOD GRINDERS AND HOGS
The following subparagraphs apply to wood grinders and hogs:
(a) Transmission Belts. Transmission belting should be checked for even tension. Belts should be replaced as matching sets.
(b) Anvils and Hammers. Anvils and hammer replacement records require review. The type of hard-facing welding rods used to build up the hammers must meet OEM specifications. The clearances between the anvils, screws, or hammers and the grate have to be measured when allowable to establish maintenance intervals.
(c) Grates. Stationary grates should be sized for the present fuel specification requirements; building up of the grates’ holes to proper size requires documentation. Check grates’ sheer pins for wear on a regular basis.
(d) Sqfety Devices. Safety devices used to shut down the wood grinders in the event of foreign object damage (FOD) require regular testing to prove their ability to stop the machine.
(1) Drive sheaves’ grooves should be free from rubber buildup.
(2) Rotating shaft should be checked for cracks propagating from the driven end.
(3) Guards surrounding the drive sheaves must be well reinforced, properly attached, and in good repair.
(4) Inspect drive sheave spokes for signs of cracking.
(5) Verify the operation of any devices used to aid in lifting the shell for maintenance and cleaning.
(-a) Check for manual dogs that hold the shell in the open position.
(-b) There should be an interlock directly wired to the starter or drive, to prevent accidental starting with the shell open.
(6) Examine the condition of the chute seals and fasteners used to remove the grinder shell for maintenance.
(c) Fasteners. Frequent failure of the fasteners used to hold anvils or knives can be attributed to
(1) not thoroughly cleaning the knife receptacles before inserting knives. (This will cause the knives to work loose in the rotor and stretch the fasteners to failure.)
(2) improper torque procedure, which could leave the fasteners loose or overtorqued beyond their limit. (Clean and inspect all threads, oil lightly, and use a torque wrench in stages. The large torque value requires a torque multiplier.)
1-10 FUEL DIVERTER GATES
Check all sealing aspects.
Check gates for impact damage and warping.
Hinge-point shafts and bearings should be straight to prevent rough operation.
L-11 CONVEYOR BELTING
Any conveyor belt inspection—walkdown should start with a comparison between original drawings and specifications with actual equipment for the following:
(a) Rubber Belting
(1) width
(2) ply
(3) length
(4) type of carcass versus cover
(b) Belt Splices
(1) Vulcanized splices have to be inspected for any delaminating.
(2) Mechanical lacing-type splices must have a 45-deg chamfer cut into the edges to prevent catching and rolling under the idlers.
(c) Pulleys
(1) Tail pulleys are subjected to grooving; excessive thinning will cause roll failure. The standard taper-lock bushings have to be retightened regularly. Inspect the endplates of pulleys for cracks. Belting should be centered on the pulley. Mechanical tension adjusting rods must have double-locking nuts. Inspect any pulley cleaners for proper tension and lack of buildup.
(2) Head pulleys are inspected in the same manner as the tail pulleys. Most head pulleys are lagged with grooved rubber to prevent slippage.
(-a) The applications of sliding rubber strips in tracks that are screwed to the pulley have a tendency to come loose. Inspect the tracks.
(-b) Vulcanized endless lagging is far superior to the mechanical method; check for delaminating and thinning of the vulcanized rubber.
(-c) Power transmission belts should show equal tension and good alignment.
(-d) The inside of the fuel transitions that house the pulleys should not have excessive buildup or signs of rubbing.
(d) Gear Boxes. Gear boxes should not have excessive leakage, noise, or excessive heat. There should be records of oil changes and analysis. Some oil should be drawn off to check for water contamination.
Gear box orientation is critical when determining which plugs are used to determine a full gear when changing oil. Check the manufacturer’s drawings.
If any power transmission equipment has been changed from the original, verify belt speed with a handheld tachometer and compare it to OEM specifications.
(e) Bearings. Bearings should run cool with little noise; a buildup of fines on the bearing indicates worn seals at the shaft penetration points in the fuel chute transition. Bearing collar set screws must be checked regularly.