Document mpVYykrRgxv2ag5JnJGpKay7g

Arapahoe Station Auguat 1, 1956 Mr* Win* H* Young Mech. Chief of Denver Plante THE FOLLOWING WORK WAS DONE AT THE ARAPAHOE STATION DURING THE MONTH OF JULY 1956* We are still In the process of #2 Unit overhaul* No* 1; cooling tower Is out of service for iSartreat* All hand hole plugs from all waterwall headers on #2 Boiler ar being removed. Plugs are being machined and header seats cleaned up or ground as needed* 7-2 Install water-wall hand hole plugs* Head up 2A oil cooler after cleaning* Paint condenser and clean hotwell* Remove and acid clean condenser vent and drain piping* Assemble bearings and coupling on 23 I*D* fan* Install stainless lined oB cross in the 7th stage heater drain to the H ? flash tank* Install new glass and gaskets in the water gauge on the East aide of #U Boiler* Repair water piping in #2 control air compressor aftercooler. Start Martreat #ii tower* 7-3 Build and install babble plates in k coal mill for Riley tests* Repair H.P* flash tank on #2 Unit* Open up H2 coolers on #2 Generator* Start bearing and vane inspection on 2A F*D* fan* Clean HB" turbine oil cooler #2* Clean combustion on #2 Boiler air heater* Repair water-wall header hand holes on #2* Pack valves on #2 Boiler* Paint #2 condenser* 7-5 Work on baffle plates on #iiAmill for Riley* Finnish install ing 6" cross in H.P* flash tank on #2* Finnish repair of cold fill valve on #2 Boiler feedwater* Finnish oil coolers on #2 Turbine* Paint #2 condenser* Tear down motor on 2B I.D* fan to find cause of vibration* A broken weld was found on the ring that holds the stator bars oa-the outboard end of the rotor* This break was re-welded* When pit back in service, motor was O.K* Inspect bearings on 2A F.D. fan) bearings shew no change since last year* Pack valves on #2 Boiler* Clean air heater and dust collectors on #2 Unit* Weld broken seams and braces on #2 forced air duct* 7-6 Repair safety valves on #2 Boiler* Work on rotor on 2B I.D* fan motor* Inspect motor bearings on 2A F.D* fan* Clean dust collectors and ash hoopers on #2* Repair hand hole plugs on #2* Repair cracks in air ducts* Inspect and clean stack breeching) no trouble here* Clean and paint gland seal tank on #2* 7-9 Open and clean tubes in 7th stage heater on #2 Unit* Clean up hand holes in lower water-wall headers* Finnish inspection of 2A F.D* fan and motor bearings) bearings show no change, all are 0*K* Start inspection of 2B F*D* fan* Clean H2 coolers on #2 Generator. Weld piping on steam air jet to fill loop seal* Head up steam air jet) all tubes are good* WAD00273 7-10 7-11 7-12 7-13 7-16 7-17 -2- Install baffle gates in UA ^11 for Riley. Clean tubes in 7th stag* heater on #2 Unit. Clean H2 coolers on #2 Generator. Install new lead safety diaphragms on 02 Turbine L.P. chest. Repair hand hole plugs on #2 Boiler. Repair motor on 2B I.D. fan. Weld leaking gauge 1 in* on 3B heater on 0k Unit. Weld piping in H2 coolers on #2 Unit. Weld cracks in forced draft air ducts on #2 Unit. Clean and inspect hotwell on #2 Unit. Head up 112 coolers on #2 Generator. Finnish installing lead explosion diaphragms on #2 Turbine. Head up 7th stage heater on 02 Unit. Weld rotor on 2B I.D. fan motor. Repair water column blowdown valves on #2. Re-weld superheater spacer bar hangars. Finnish welding in air duets on #2. line up and weld temp, probe hangars. Head up #2 Boiler. Install new water glass in 3B feedwater heater on #U Unit. Repair cracks in #2 Seller vet ash pit. Head up #2 condenser. Pack valves on 02 Unit. Repair safety valves on 02 Unit. Open and clean seal oil cooler on #2 Unit. Finnish welding super heater hangars in #2 Boiler. Test run 23 I.D. fanf nans normal. Install new belts on S? air conditioning unit. Install stilling well in #2 Turbine hotwell. Weld in new instrument valves on feedwater systems for Results. Reweld drag line in #2 condenser. Repair safety valves on #2. Tighten hand hole plugs on #2 3oiler. Test ran all fans* all are O.K. Head up hotwell on #2. Finnish cleaning seal oil cooler on #2. Boiler 02 filled with water and ready for Hydro. 3um out coal bunkers on #3 Unit. Assemble 3D coal mill. Put Hydro on #2 Boilert held 1000# pressure on Boiler It hours so that all hand hole plugs could be tightened under pressure. All plugs are good* 3ci]er ready for fire. Tighten heads on feedwater heaters on #2 uir.t. Pack valves on #2 Turbine. Clean stack ash hopper; we had to remove piping and lance out 3 ton oil hard fly ash on to the ground here. Finnish coal bunkers on #3 Unit. Repair broken valve on service water tower. Start gathering up fly ash for #3 Unit Turbine Job* Clean 0k tower after Martreat and put in service. Rebuild two sections of screen for 0k tower. Set safety valves on #2 Boiler. The superheater safety valve popped and only relieved about U lbs. The blowdown ring was raised about 1/2 turn j when the valve popped this time, it started multiple popping. This we stopped after it had seated two times by holding valve open. The blowdown ring was raised 1/2 turn and 6 notches again; popping pressure wae O.K., blowdown O.K. Hank will send the test sheet. Tighten all plugs and man holes on 02 Boiler. Tighten heater flanges and heads, also flash tank head on #2. Ho. 2 Boiler put on the line. Install new rotor in 3A primary air fan motorf$ll primary fans now have new rotors. Repair stack valve on #U tower* Clean up #2 Unit. Get fly ash for #3 Turbina overhaul. WAD00274 7-18 7-19 7-20 7--2? 7-ZU 7-25 -3- No. 3 Unit off of the line at 1 p.n. Safety valves set on #3 Boiler. Hove pump and equipment and clean up around tower. Clean up stop logs to get ready for inspection of #2 and 3 for #3 T^P^TMP<eUT&+toOrJVfoKh\ rin Roora flor and tighten get 111 chlaibSbd inhgole plugs on #2 Boiler.. Repack #U3 feedwater oump. Pack recir culating pump on SI Unit. Ready to start #3 overhaul. No. 2 Unit in service and operating O.K. Start overhaul of #3 Unit. Remove lagging on #3 Turbine. Open ^3 condenser and nctwell* Open fire side on #3 3oiler. Set stop logs to inspect #3 circulating pump and basin. Get fly ash for #3 Turbine rotor. 3reak Moul in on overhead crane. Drain #3 Boiler. Turn spade valve and open drums. Remove hand hole plugs on top water-wall header. The seats on most of the hand holes will need grinding. Blow combustion on super heater tubes. Inspect #3 circulating pumpj no wear found on metal spray except for a small section ii" in diameter on one impeller blade. Remove lagging and insulation on #3 Turbine. Set aux. springs and remove bolts on L.P. case on #3 Turbine. Clean scale in #3 condenser. Pack valves on #3 Boiler. Weld cracks in P.D* fan ducts. Install line drain valve on #3 deareator. Test clay valves on #3 circulating pump. Clean up oil reservoir on #3 circulating pump motor. Pull stop logs and clean up to set in #2 circulating pump basin. Remove end bells on #3 Generator. Remove exciter. Wash drums and tubes in #3 Boiler| blow fly ash. Inspect U5 flanged ell on 7th stage heater of #3 Boilerj no wear in ell. Fill #2 bunkers with coal. Scale #3 condenser. Inspect Boiler and condenser steam side and hotwell #3* Weld Boiler air ducts. Remove steam chest belts :n #3 Turbine. Open up #3 Generator. Set atop logs in #2 circulating pump basin. Scale and paint #3 condenser. Wash drums and tubes, blow fly ash in #3 Boiler. Open and clean tubes in 15th stage feedwater heater on #3. Install baffle gato in iiA coal mill for Riley Co. Remove drain line on 15th to 18th stage heater, from 18th stage heater and install in #3 hotwell. Repair valves on #2 sootblcwing air compressor. Clean 15th stage heater on #3. Faint #3 condenser. Inspect #2 circulating pimpj pimp is O.K., shows no wear. Erosion has started in the bottom of the basin since the new baffle wall was installed last year. The eroded section is about 3 ft. in diameter and ranges from 0" at the edges to 1/2" deep at the' center. This place is center under the pump suction bell. Tear down #3 Generator. Remove ot.. am chest bolts on #3 Turbine. Paint #3 condenser. Seven men working on the Turbine and Generator job. Install baffle gate in #UA mill for Riley. Repair wear plates in 1A coal mill. Work on #3 Boiler overhaul. WAD00275 7-26 7-27 7-30 7-31 Repair valves and clean water jackets on #2 sootblowing air compressor. Repair valves on #1 control air compressor. Pull stop logs on #2 circulating pump* No. 3 Generator over haul* Pull 3B condensate pump. Pump has hole in 2nd stage Volute and wear under the wear rings and bushings. Will be built up in the shop. Clean vent lines on #3 condenser, install velocity test tube in #3 Boiler as per Stearns Rogers instructions* Repair wear plates on Ik coal mill. Clean up #3 3oiler* Field out of #3 Generator. Repair hand hole plugs on #3 Boiler. Pack valves on #3 Boiler. Blow combustion on #3 Boiler air heater. Install velocity connection* on 3 Boiler* Work on 33 condensate pump* Inspect bearings on 33 I.D* fan* There is no change sinde last year. Tear down 3D I.D* fan motor for cleaningjbearings O.K. Clean vent linos on #3 condenser. Inspect valves and clear water jackets on #3 and ii control air compressors* Lift L.P. chest off ff3 Turbine* Chest came off 2 3/h" out of level. Clean combustion and repair hand hole plugs on #3 Boiler. Pad valves. Clean water jackets and repair valves on #3 soot blowing air compressor. Inspect bearings on 3B I.D. fan* Clean up diversion dan and river screens. Carts, Dacus and Schmitt offj Britton off ntil 1 P.U. "ioul, Roberta, Otzko, and Jackson on vacation* The heavy rains filled the coal tunnels during the nightj we spent all day pumping the crusher House and removing the pump for motor repair* The motor was under about 2 ft* of water* The motor on the pump in the track hopper was still above water. We pumped this with the bilge pump. The acid man hole also filled up; we pumped this and cleaned out the mud. Continuing work on #3 3oiler and Turbine job. H$.gh Pressure chest lifted off #3 Turbine* Chest was not balanced and rubbed ceasing off* We had to cut out the partitions on the stub header on the West side of #3 Boiler so that we could grind 21 hand hole plugs* This is about everything for J'lly. At this time it looks like the #3 overhaul will tale all of the month of August* Respectfully submitted JD/efl John Donaldson tlech. Working Foreman WAD00276