general maintenance and alignment of rotary equipment · the shell under the tire and gear...

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Page 1: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Presented By…

Page 2: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Three Generations

Specialize in Design and Fabrication Unmatched Engineering In Rotary

Equipment 50 Years Field Service Experience

Presenter
Presentation Notes
Our leadership is built from well over 50 years experience. We have provided you with unmatched engineering…….. Jerome Menzia3/6/2009 There are three Generations of Menzia's working toward delivering a quality product to meet our customers expectations and project commitments. Jerome Menzia3/6/2009 Our over 30,000 square foot shop is equipped with over 100 ton crane capacity and houses our state of the art equipment used in the fabrication of rotary equipment. Alot of our tooling has been design by us to solve issues associated with field istallation and repair of rotary equipment. Jerome Menzia3/6/2009 Many of the designs of we use in our rotary equipment are based on the our extensive experience in the repair and maintenance of rotary equipment. Jerome Menzia3/6/2009 My father Joseph still works every day in the shop and brings over 50 years experience himself into every fabricated piece that leaves our shop.
Page 3: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Page 4: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Components of Rotary Equipment Alignment of Trunnions, Tires, Pinions, Gears,

and Thrust Rolls Lubrication of Components

Daily, Weekly, and Annually Inspections General Maintenance

Page 5: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Shell

Flights Discharge Barrel

Presenter
Presentation Notes
Shell: is fabricated from steel plate (varying in thickness & material) depending on process application and other factors such as: temperature, lengths, refractory, flights, etc. . The shell under the tire and gear (sprocket)is designed to support the tire and drive system components. Flights: Installed inside the drum to allow for push (spiral) and cascade (saw tooth, cup, J-flight and L-flight) of the product as it flows through the dryer. The combustion flight is also used in Direct Fire Dryers to insulate the primary heat zone.
Page 6: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Trunnion (Support) Bases

Trunnion

Rollers(Rolls) Thrust Rollers Pillow Block

Bearings Adjusting Screws

Presenter
Presentation Notes
Trunnion (Support) Bases: A steel frame where the trunnion rollers are set. Trunnion Rollers(Rolls): are generally fabricated from a forging, although cast trunnions remain commonly used. Thrust Rollers: operate off the side of either the downhill or uphill tire to maintain the drum in position on the trunnion rolls; as well as maintains proper mesh of the pinion gear on the drive gear.
Page 7: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Tires(Riding Rings) Floating Pad (Filler Bars)

Tire Retaining Bars

Side Blocks

End Blocks

Shims

Shim Keeper

Presenter
Presentation Notes
Tires(Riding Rings): fabricated either from a casting, forging, or rolled ring may be of any one of a number of widely used designs including segmented tires, lap-joint and single piece tires. Floating Pad: The most common method to mount the tire is the free-floating pads system. In some instances, tires are welded to a shell. Floating pads are locked, but NOT welded to shell. Using four side blocks, floating pad is held in place circumferentially. Floating pads are sized to allow greater than 60% coverage under the tire. Floating pads are held laterally by end blocks and by the tire retaining bands. The shims are held in place by the shim keeper.
Page 8: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Gear Ring Pinion

Jack Shaft

Chain Reducer

Sprocket

Presenter
Presentation Notes
The Gear Ring: is mounted to the shell. Gears typically are mounted to the shell via a mounting “flange” or tangential plates. Pinnion: is the drive gear for the gear ring. Jack Shaft: is a shaft that the pinnion or drive sprocket is mounted to allow easier access for alignment. Sprocket: is an alternative cost effective approach to rotate dryers. A chain around the shell is used to rotate the dryer.
Page 9: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Firing Hoods Combustion Chamber

Discharge Hoods

Seals Conveyors

Presenter
Presentation Notes
Firing Hoods and Combustion Chambers: Are included as required in accordance with the overall process application. The firing hood may be retractable or stationary. Seals: Primarily used to control the movement of air and product at the points where the feed or discharge ends of equipment. Many various adaptations are used in the industry.
Page 10: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Page 11: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Page 12: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Page 13: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Case In Point: The more the tire keeps the shell round (contained), The less the pad is allowed to warp (deflect) and the less working (thus cracking) of welds

Page 14: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

There is hardly a mechanical adjustment so simple and yet so often incorrectly made, as the training of trunnion rolls to make the cylinder “float” between the thrust rolls.

Page 15: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

“y” is known from the original manufacturer’s design. (Height of shell in hood) “h” Add ½ the diameter of the tire and ½ the diameter of the trunnion. “x” Can be calculated “α” Can be calculate. (generally around 30 ° angle)

y

h

x x y h

x α

α α

Page 16: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Presenter
Presentation Notes
  As you can see on the picture there are punched “Marks” at the center of the base indicating the centerline of the dryer. The trunnion shaft centerlines and the design distance from the centerline are also marked on the frame. The surface of the trunnion rolls MUST be parallel to the surface of the riding ring. The trunnion roll shafts of each pair of trunnion rolls must be absolutely parallel with each other. The cylinder MUST be carrying its normal load of material when the final adjustment is made. The finished top surfaces of the trunnion bases MUST NOT be warped by improper wedging and grouting of the bases on the foundations. The slope of the dryer is set by the mounting of the bases on the piers.
Page 17: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Move Trunnions to neutral position. ( “X” dimensions are equal)

Shim pillow blocks of smaller

diameter trunnion rolls. If Tires are different sizes shim all

pillow block bearings the same amount to obtain the correct height of drum.

Now make skew adjustments to float drum

y

h

x x y h

x α

α α

Page 18: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

The ideal position is light “off-and- on” contact between the riding ring and the downhill thrust roll.

“Training” of trunnion rolls is the

same as skewing rollers under a heavy box, to affect a sideward as well as forward motion.

When the trunnion rolls are exactly

parallel to the cylinder axis and to the face of the riding rings, there is NOT enough force from the rolls to balance the “downward” thrust of the cylinder in the direction of its slope.

To offset this tendency and

overcome this force, a slight skewing of the trunnion rolls is all that is required.

Page 19: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

First, number the adjusting screws. Make sure adjusting screws are tight against bearings. Next, take all tension off the bearing bolts.

Set up a magnetic based dial indicator

behind the bearing. Establish good contact with bearing base and set indicator to zero.

Screw in adjusting screws (2), (3), (6), and (7)

EXACTLY at .010” each. Snug down bearing bolts and rotate cylinder with power for ten (10) minutes (BY THE CLOCK).

If the cylinder does not change axial

position, loosen bearing hold down bolts and proceed this time by placing dial micrometer at base of bearing. Screw out adjusting screws (1), (4), (5) and (8) at exactly .010 each.

Page 20: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

FE C L

C L

DE

36” 36”

36” 36”

36”

36”

36”

36”

Pier # 1

Pier # 2

The drum will float downhill with the slope of the dryer until the thrust roll stops the drum

Page 21: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

C L

C L DE

FE 29.9” 36.1”

36.1” 29.9”

36.1”

36.1”

29.9”

29.9”

Pier # 1

Pier # 2

C L

C L DE

FE 36.1” 29.9”

29.9” 36.1”

29.9”

29.9”

36.1”

36.1”

Pier # 1

Pier # 2

Uphill Skew All Trunions Downhill Skew All Tunnions

Page 22: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

C L

C L

DE

FE 29.9” 36.1”

36.1” 29.9”

29.9”

29.9”

36.1”

36.1”

Pier # 1

Pier # 2 Uphill Skew Pier #2

Downhill Skew Pier #1

Opposing Forces

Page 23: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

C L

C L

DE

FE 36.1” 36.1”

29.9” 29.9”

29.9”

29.9”

36.1”

36.1”

Pier # 1

Pier # 2

Pigeon Toed – Opposing forces Pier # 2

Downhill Skew Pier # 1

Page 24: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Offset the thrust roll centerline 0.25” toward the downward rotation 0.38” Gap between Thrust Rolls and Tire Pinion and Tires on Rolls in perfect position when dryer resting on downhill thrust.

Presenter
Presentation Notes
Positioning of thrust rollers has a direct impact on the dryer performance. The centerline of the thrust rolls on the trunnion base is offset by greater than 0.25” from the centerline between the trunnion roll shafts. This offset allows for the tire to rotate downward onto the thrust rolls forcing them onto the thrust shafts. The gap between the thrust rolls and the tires are set for safety reasons. This distance between the thrust rolls should be 0.38” greater than the width of the tire. This small allowable movement of the rotary dryer maintains the proper position of the tires on the trunnions as well as the pinion and bull gear positioning. The rotary dryer should be in perfect position when the tire is just touching the downhill thrust roll.
Page 25: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Train the empty cylinder to favor the downhill thrust roll in “float” or actual light contact on the lower thrust roll.

When the cylinder is loaded with material it will

have a tendency to move downhill due to the extra weight. Watch the cylinder movement and adjust only if necessary to keep the fully loaded cylinder “floating” between the thrust rolls.

A properly adjusted set of trunnion rolls will

cause a constantly loaded cylinder to “float” between the thrust rolls for weeks at a time without the riding ring touching either of them.

Preferably the tire should be resting on the

downhill thrust roll approximately 80% of the time. When empty, the cylinder should travel uphill against the upper thrust roll (feed end thrust roll).

Page 26: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Steel flake forming on shafts of Trunnion Rolls

Regular patterns forming on Tires Uneven polish on Tires Rolled over edges on Tires Mushrooming of Thrust rolls Tunnion Shafts breaking

Bearings failing(overheating)

Presenter
Presentation Notes
Many riding rings, trunnion rolls, and thrust rolls have been worn out long before they have been given a fraction of their proper service. Frequently the equipment manufacturer is blamed for using poor materials because of the rapid wear of riding rings and trunnion rolls. Improperly “trained” trunnion rolls may run for weeks without much evidence of distress. Once the distress shows up, the effect is cumulative and the trouble usually advances rapidly to a critical stage. A cylinder can be improperly adjusted on its rolls, and still float between the thrust roll, but it will wear out one set of trunnion rolls after another. (FE Pier Rolls opposing force to DE Rolls.) When a new cylinder is first put into service, the thing to watch is the surface of the riding rings. If they become smooth and bright, without “ripple” marks or small, seemingly slight “pattern” figures repeated over and over as the ring revolves.
Page 27: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Backlash can be measured as shown

A strobe can be used to see contact surface in operation

Presenter
Presentation Notes
Positioning of thrust rollers has a direct impact on the dryer performance. The centerline of the thrust rolls on the trunnion base is offset by greater than 0.25” from the centerline between the trunnion roll shafts. This offset allows for the tire to rotate downward onto the thrust rolls forcing them onto the thrust shafts. The gap between the thrust rolls and the tires are set for safety reasons. This distance between the thrust rolls should be 0.38” greater than the width of the tire. This small allowable movement of the rotary dryer maintains the proper position of the tires on the trunnions as well as the pinion and bull gear positioning. The rotary dryer should be in perfect position when the tire is just touching the downhill thrust roll.
Page 28: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Infrared temperature measurements Dotted lines shows misaligned temperature

profile Solid line shows correctly aligned temperature

profile

Presenter
Presentation Notes
Positioning of thrust rollers has a direct impact on the dryer performance. The centerline of the thrust rolls on the trunnion base is offset by greater than 0.25” from the centerline between the trunnion roll shafts. This offset allows for the tire to rotate downward onto the thrust rolls forcing them onto the thrust shafts. The gap between the thrust rolls and the tires are set for safety reasons. This distance between the thrust rolls should be 0.38” greater than the width of the tire. This small allowable movement of the rotary dryer maintains the proper position of the tires on the trunnions as well as the pinion and bull gear positioning. The rotary dryer should be in perfect position when the tire is just touching the downhill thrust roll.
Page 29: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Page 30: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Page 31: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀
Presenter
Presentation Notes
Positioning of thrust rollers has a direct impact on the dryer performance. The centerline of the thrust rolls on the trunnion base is offset by greater than 0.25” from the centerline between the trunnion roll shafts. This offset allows for the tire to rotate downward onto the thrust rolls forcing them onto the thrust shafts. The gap between the thrust rolls and the tires are set for safety reasons. This distance between the thrust rolls should be 0.38” greater than the width of the tire. This small allowable movement of the rotary dryer maintains the proper position of the tires on the trunnions as well as the pinion and bull gear positioning. The rotary dryer should be in perfect position when the tire is just touching the downhill thrust roll.
Page 32: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

The fact that there are so many variations and methods, lubricants and operating conditions, it becomes impractical to make specific

recommendations covering all cases.

Page 33: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

HAND LUBRICATION: Pour buckets of hot grease on gear, brush grease on gears, grease pans etc.

MECHANICAL: Automatic greasing systems spray

grease directly on gears intermittently. Bearings are sealed and a large grease reservoir

requires only occasional lubricant replenishing. A graphite stick holder is available to provide

continuous lubrication of the thrust rolls, tires and trunnions .

Page 34: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

How do I get the full lifetime of the components?

How often should I perform

maintenance? What will it cost?

Page 35: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Pitting Spalling Cracking

Marking

Irregular Face Profiles

Page 36: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Improves Mechanical Efficiency

No Costly Downtime

Maximizes Equipment Life

Reduces Operation Costs

Page 37: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Vibration Rolled over edges High power consumption Alignment issues Premature bearing failure Damaged bases, piers, and footings

Page 38: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Hot spots evident on dryer shell? Any unusual sounds or vibrations? Leakage of air or product at feed or discharge

hoods? Condition of nose ring seal? Support frames and piers vibrations or movement? Tire patterns, ridging, wobble, pad welds and

movement? Dryer thrusting uphill or downhill? Bearing temperatures normal? Spray grease on gear operating?

Page 39: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Startup emergency drive engine Check graphite block lubrication Check creep or gap on tires Lubricate between floating pads and tire ID Clean pier tops and remove built up product Check all lubrication levels

Page 40: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Check pitch line separation on gear and pinion Check pitch line run out Check condition of welds on gear flange or spring

flange Check for excessive ring or roller wear

Page 41: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Change gear lube and clean sump and gear area Change grease on pinion shaft bearings Change grease in thrust roller bearings Inspect dryer shell for cracks under tires

Check refractory for wear

Inspect drive coupling grid members

Page 42: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Check alignment and elevation of each pier Adjust the rollers to neutral to retrain the dryer Weld repair cracks in shell, floating pads and

support bars Clean and inspect gear, repair broken bolts and

flanges

Clean and grease adjustment bolts

Page 43: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

ITEM CHECKED Sunday Monday Tuesday Wednesday Thursday Friday Saturday COMMENTS Discharge Seal

Dryer Shell

Discharge End Tire Condition

Discharge End Trunnions Condition

Riding Ring and Trunnion-Contact Pattern

Thrust Roller Surface

Feed End Seal

CONDITION KEY: E=EXCELLENT G=GOOD F=FAIR P=POOR Feed End Tire Condition

Feed End Trunnions Condition

Tire Position on Trunnions

Trunnion Bearings and Seals

Trunnion Bearing Temperature

Floating Pads- Condition and Welds

Retaining Bands-Condition and Welds

Gear Contact Pattern

Gear Lubrication Spray System

Gear Sound

Graphite Lubrication

Setup A Daily, Monthly, Quarterly and Annually Inspection Log

Page 44: General Maintenance and Alignment of Rotary Equipment · The shell under the tire and gear \⠀猀瀀爀漀挀欀攀琀尩is designed to support th對e tire and drive system components.\爀䘀氀椀最栀琀猀㨀

Borax Management for allowing the presentation of this information.

Joseph Menzia for his knowledge from 50 years of experience in equipment repair.

Ed Parsons, a long time colleague, for providing his expertise in the engineering and operation of rotary equipment .

And finally, for your patience and interest in Rotary

Equipment, we thank you.