- rotor lathe work
- Rotor lathe swings 132"
- Lathe will take rotors as long as 45' with extended ways
- Journals machined
- spigot fits cut
- collector rings ground
- shroud machined
- rotor thrust collars
- They can be machined in our portable lathe
- We have also machined them in place without turning the rotor.
- blading and bucket work
- We have a working alliance with another company and joint venture this work. They do the welding and we do the machining.
- Westinghouse governor
valves
- We can weld, machine and lap the seats
- We can also replace the type of seat that takes the stellited insert which is put into the steam chest from the bottom before the leads are welded on. We can build the new seats, too.
- Steam chest bores can be welded, bored and honed.
- Top faces of steam chests can be faced and lapped
- We have probably done more governor valves on Westinghouse turbines than any other job in a power plant
GE control valves & stop valves
- boiler feed and other
pumps
- Machining the face on a circulation pump in preparation for installation of a new mechanical seal.
- collector rings ground
- in place
- in rotor lathe
- nozzle blocks replaced
- Pictured here is a Westinghouse nozzle block in the process of being lapped in with a machine we built for the purpose. Also pictured is the result of a blue check on the finish-lapped nozzle chamber, where the nozzle block bolts on.
- diaphragms removed and
replaced
- We can remove and replace the caulked in diaphragms like are found on Westinghouse turbines. We once even built a saw to cut through the caulking in an application where the caulking was not in a location that it could even be seen, much less removed in the usual fashion.
This
setup was made for drilling and tapping new stud holes in the end of a
Westinghouse throttle valve after the old holes had been welded up.
- Westinghouse throttle
valves
- seats removed and replaced
- old seats can be refurbished
- gasket faces re machined
- spigot fits welded and re machined
- studs removed, holes welded, bored and threaded
This photo shows the completed end of the throttle valve after the face and gasket surfaces were machined.
- single point threading
- When the hole is too big to be easily drilled and tapped, we can cut the threads with a single point boring tool.
- we can also build the thread inserts on our CNC machines
- inlet sleeves built up
and rethreaded
- threads for bell seal retainer nuts are built up, heat treated, and then bored and threaded to new spec.
inlet chambers machined and honed
- spring back seals
- We can fit your new seals to the cylinder and machine them to size.
- we can also build them new in their entirety
- "caulked in"
seals
- We can remove the old seals, install the new and machine them either in the cylinder on site, or on a VBM in the shop.
- gears
and turning gear boxes
- We can rebuild the turning gear apparatus in its entirety.
- We have also been called upon to re machine in place the teeth on the turning gear of an Allis Chambers turbine
- We can reverse engineer and build the gears as well.
- gasket modifications on
RHSV and IV
- Modifications to Westinghouse Reheat Stop Valves and Interceptor Valves so that they will accept the new spiral wound gaskets.
- coupler bolt and drive
pin holes
- We can bore and hone the coupler holes in place.
- We can also bore and hone the drive pin holes on the new Westinghouse BB33/65 units with the rotors still in the cylinders. Only the top half of the HP outer gland needs to be removed.
- flange facer work
- Uintah has flange facers for up to 72" diameter.
Uintah
has boring bars too numerous to list, but they range in size from 1 1/4"
diameter up to 10" diameter. The longest one is 24 feet. We have
duplicates on most of the smaller ones
- boring bars
Machining
the fit for the seat ring and facing the top on a 49" pressure regulating
valve (PRV) with an 8" boring bar.
Machining
the stem guide bushing bore in the bottom of a pressure regulating valve
at a hydro-electric installation
- wicket gates
on Francis type hydro turbines
- Various setups used for align boring wicket gate bushing bores in various hydro turbines, both horizontal and vertical. Uintah machine has boring bars from 1 1/8" through 6" suitable for this application.
- Miscellaneous
power generation service work
- A special-built machine used to drill and tap holes to hold liner plates to the inside of a spherical discharge nozzle on a pressure regulating valve (PRV). This drill is rather universal, and with proper attachments it can be used for projects as diverse as pinning nozzle block bolts on Westinghouse steam turbines to drilling seat bolt holes such as are found on a Pelton butterfly type turbine shutoff valve (TSV).
This
photo depicts a setup used to machine a gland face on a boiler feed pump
turbine and also cut a groove in the face for a pumped sealant. The job
was done with the rotor still in place and held stationary.
- on-site
heat treating
- Unitah Machine has state-of-the-art equipment to do on-site preheating, soaking, and PWHT