Document v6Jyxow7de0ZRmz6qJyOQ7xZb

More PRACTICAL IDEAS. MOIII Draff Stops Slagging Feedwater Heater Hook-Up As installed, o condensate line was piped direct to feed-water heater of a waste heat boiler. Cold make-up water was alio piped to this heater and con trolled by a float located inside the heotcr, skeieh, Before. Condensate was being pumped to heater from a proc ess plant by a motor-driven pump controlled by an on-ond-ofl float switch. Owing to pump's intermittent operation, heater got more condensate then it needed whenever pump was running. But only cold water came through et other times. This caused unstesdy feed water temperature and an excess con densate overflow. To ensure minimum makemp water to this heater and to avoid condensate woste, we modified as In the skeieh. Now. Both condensate and cold makeup now feed an overhead tank (well lagged end roofed) end both lines have float-controlled valves. Condensate valve closes only when tank is full. Make-up water valve opens only when level in tank drops to less than one-third of full tank level. Float inside heater now regutetes flow from overhead lank to healer. When overhead tank is full, condensate vatvo is closed by (lost and surplus condensate flows to another heater at a higher ele vation in main boiler plant This system has been operating Very satisfactorily lor the past two years. A hANCANATHAN Alwaye, S. India Flexible Lines Save Packing Fuel-oil pumps in our plant had to be packed twice a year'when suction and discharge lines to pump were standard pipe. Difference in oil temperetures evi dently caused pump to be moved slightly out of alignment. I replaced lines with short sections of flexible metal hose, photo. That was five years ago. Pumps have not been repacked in that lime. Now we solve similar problems around our plant by installing flexible fines. W J Heim Rahway, N. J. Self-Priming Siphon An UNDERcnouND pipeline (dotted line in sketch) carried ewoy acidic wastewater from an underground sump to drain at lower level. Line had to be replaced after some years of service. Re placement wnold involve on immense amount of excavation at pipeline was about 30 ft long And 10 ft below ground. We installed siphon setup (solid line) to replace old pipeline. VJ-loop on each end saves priming siphon as oction is automatic when pump fills. A RaNcanatiian Always, S. India Wg rad a serious slagging condition outside ol bottom-row tubes in 120^ lb per hr cross-drum watertube hollo; Boiler come of! the line about every months for deslagglng. lucl burned u anthracite No. 3 buckwheat siu, coomonly known as barley. Fine shea of anthracite coal produced a lot of flyash, mostly small flakes ( unburned coal during combustion nod. Some this flyash bums la pension while passing upward through the tumace. It produced a slag forma tion on bottom row of our tubes. Coodition kept getting worse si slag ccumulated. If let go too long. It woqU bridge over openings between tube spac ing end eventually block ofl the draft. We burn this fme-sixe anthracite coal SteMtts stool o oo O O 00 on chain-grata and traveling-grate stok ers, usually maintaining a slight pres-. sure or balanced draft over the fire. While trying to remedy this slagging condition, we chocked the draft eoadh-, iion* slightly below bottom-row tubes. There was a pressure. We, therefore, changed our forced- and induced-drslt conditions to produce o draft of not leu then 0.05 In. of water, at a point about eight inehes below the bottom-row lubes With draft at this point, flytth Is car ried up between tubes and peases before it has a chance to stick to tubes sod form slag. We now operate boiler much longer periods without deslagglug. A 24-hr recording draft gage, sketch, helps operator 'maintain a consist minus draft below these tubes. E E Smith Clark's Summit, Pa- Broom Handle and Cork Eo Eckert (July Powr.fi) will find that broom handle works o lot better fflr removing light bulb bases (that balk* have broken in) if he secures a cork to end of handle. If Holcombe Los Alamos, N. df> sown128 PLANT OPERATION AND MAINTENANCE SECTION THIS ERIE CITY "PACKAGE" ICLUDES A YARWAY SEATLESS Yarway Type "B" Seillen Blcw-cfl Valve ihowa in open position. Rote bal- sneefl sliding ptungw de sign. end no set! to mre. wear, elog, ot leak. Pres sures to 400 lbs. The above installation of two 300 hp. Erie City VL type boilers ol a Detroit automotive plant shows Yarway Sealless Bfow-ofT Valves as part of the "package" picture. Good package-type boilers are belter when equipped with Yarway Blow-off Valves. Get the advantages that have made Yarway Blow-off Valves guardians of blow-down lines in more than 15,000 boiler plants. On your package boilers--whatever the make--high grade blow-off valves pay off in dependable, trouble-free service. Write for Yarway Bulletin B-426. YAWNALL-WARING COMPANY 100 Mermaid Avenue, Philadelphia 18, Pa. BRANCH OFFICES IN PRINCIPAL. CITIES NOVEMBEK 1953 SEATLESS BLOW-OFF VALVES