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FILE NAME: Power Generation (POW) DATE: 1931 May 15 DOC#: POW021 DOCUMENT DESCRIPTION: Excerpt - Trade Journal E ditorial TAFF AUTHOR L. UlCB I'd itor R. E. T urner M anaging Editor A. W . Kram br A ssociate E ditor E. C h e s t e r Earle A ssociate E ditor n. R ic h a r d Mo r r is A ssociate Editor Contents of this Issue Page B ottling C hicago's Supply of M ilk ............................................. 536 Economizers as W aste H eat Recovery A pparatus, liy Jos. V. P.oav. J r .............................................................................. 541 Steam T u rb in es in the P a p e r In d u stry . l'>\ K. (i. StaiuErwiik ............................................................................ 54o Comparison of N atural Gas Fuels--III. Place ................................... P>y P alm er B. 545 T urbines D riven by N a tu ra l G as. By V. H . J o h n s t o n . . . . 548 Reclaim ing H e a t from B lo w d o w n ............................................... 549 B itum inous C oal C onference a t C arnegie T e c h ................... 550 Diesel E ngine U pkeep. By E d w ard J. K u n z e ..................... 551 New D istrict H eatin g P la n t for D a y to n ............................... 555 A .S.M .E. N om inates O fficers....................................................... 557 S m plified V oltage D rop C alculations. By F. t . D eW eese 558 Use of A utom atic R egulators in Industrial Plants. By J. H A sh b a u c h .......................................................................... 561 L ubrication E n g in eerin g M eeting at S tate College .......... o64 Ammonia Condensers, T heir Care and Operation. By C. T. B ak er.................................................................................. 5b5 Spier F alls N ow H as L a rg e st W a te r W h e e l U n it............... 567 Inspection R outine for E lectrical E quipm ent. By A. I. G reenw ood ................................................................................ ' 568 M otor M ounts by F lan g e d A tta c h m e n t.................................. 569 M anless A.C. E lectric C ars. By R. F. E m e rs o n ................. 570 A nti-F riction B earing L u b ric a tio n ............................................ 571 B elt C onveyor Life In crease. By W . E. P h ilip s ............... 571 L etters D irect from the P la n t: B .t.u.'s-- a Tool. E ffect of Various M aterials on Fire Clay M ixtures. Repairing Square I.ap Jo in ts Relief V alve L o cation 1- im p o r tant Safety Factor. Screw Vise. R epairing of Leak} Scroll Case. M a g n t'ia Block D ust P re v e n tio n .......... 572 Questions and A nsw ers: Boiler Construction Details. C om putation of E q u iv alen t E v ap o ratio n . Oil in Boiler C auses B ags. B earing A d ju stm e n t.................................... 575 Editorial C om m ent: R ating A dvertised Products. A n o th er H a rn e ss for N a tu re .. ................................................... 576 Off D u t y ....................................... 576 Taylor Stokers for Hudson A v e .............................. 578 Saivertop Steam T rap ........................................................................ 578 Improved Thermix T ype C Air H eater.................................... 579 Type B P W ater-Tube Boiler for L ow H ead Room ........ 579 Tackiscope fo r O b serv in g M o tio n ........................... . . . . 580 Com bination Blowoff Valve............................................ 580 Sfiews N o t e s ............................. 581 Books and C atalogs............................................................................ 582 ?ow er Plant Construction N e w s................................................. 584 Contents of back issues of Power Plant Engineering will be found in industrial Arts Index, on file in public libraries. Published on the 1st and 15th of each Month by the Technical Publishing Co., 53 W e st Jackson Blvd., Chicago New York Office, 171 Madison Avenue Subscription price $2.00 a year in the United States and possessions. Copyright 1931, by Technical Publishing Co. Entered as second class matter May 1, 1908, at the Post Office at Chicago, Illinois, under the Act of March 3, 1879. Member, Associated Business Papers, Audit Bureau oi Circulations. The New Era TIME WAS WHEN milk was milk and the production of it was left entirely up to the cow, although rumor has it that she sometimes received a little unlnoked for assistance from the well. As time went on, it was realized that in order to do good work it was necessary to have tin* producing unit contented. Judgin'; from contemporary literature of this early period the cow was contented only when feeding in pastures at a considerable elevation above sea level. With data available at that time, investiga tions placed this elevation at 5000 ft. Later scientific investigation proved that with proper care and feeding the elevation of the pastures was im material. Rapid growth of the dairy industry during this era made if necessary to pay strict attention to methods of handling, transporting and delivering milk so as to insure purity. For years the Bowman Dairy (Jo. has recognized the importance of adequate inspection of dairies, methods of testing to insure the purity of the supply and sani tary facilities for bottling. Their engineers have just completed a plant which the milk industry hails as the World's Finest. It is described on the following pages. They have gone one step farther, however, and rec ognizing that a contented customer is just as important a part of the business as a contented cow, they have fitted up a visitors' reception room in the new plant. This room, shown above, is the focal point of the plant and from it visitors can view practically the entire operation of receiving, pasteurizing, cooling and hot- 574 May 15, 1931 densate goes through the bypass there will be small chance of scale forming. Unless the vacuum check valve is operated quite often, dirt will collect behind the seat and hold the valve closed. An inexpensive connection can be installed easily so that water can be blown through the vacuum valve to keep it clear of dirt. Of course if the operation of the pump causes the vacuum valve to open frequently nothing else is necessary. Many cases have been recorded where check valves, safety valves, and the ordinary de sign of relief valves have proven unreliable when used on hot water tanks using raw water as supply or makeup. Toronto, Canada J ames E. Noble. Screw Vise F or the small amount of effort that it requires to make it, there are few better ways to hold screws and studs than in a regular screw vise that grips them by their threads. In the illustration is a simple one to make, which will firmly grip the screw or stud while one is sawing a slot in it, drilling a cotter hole or reehasing the threads with a die. It is made by first drilling and tapping a series of holes suitable to the sizes of studs or screws most used and then sawing down through the center of these to make two sections. Next the two pieces A and B are mounted. One marked B is fastened permanently to the base C by several large machine screws and the one marked A is pivoted at E by another large screw drilled and tapped into the base plate. At F an eye bolt passes through the two parts and a clamping lever G with a cam face H produces the gripping pressure. A coiled spring I with an end in each part, is held by a screw and opens the jaws when the lever is released. A longitudinal slot is cut in the plate under the fixture to permit the longer screws to pass through. The whole fixture can be secured to the bench or held in the vise as desired. Concord, N. H. Chas. H. Willey. W hen work is done at the rate of 550 ft. per sec. or t R s n s y ( i f ) ___ \ 0 9 A n n j?a it- ... Repairing of Leaky Scroll Case In a water turbine plant a riveted steel-plate, spiral casing was giving trouble by- leaking through the 'S concrete masonry in which the casing was buried. The ? leakage came out on the downstream wall and followed .J a construction or pouring joint for part of the way. The 'J scroll case was proved guilty for coloring matter intro- % duced into the pipeline appeared at the downstream ..j point of discharge. ; J The water turbine had been in service a number of -f years and had been subjected many times to pressure - rises of 40 per cent above normal operating head: these shocks in time loosened the joints. It is hard to under stand why these riveted seams loosened inasmuch as the casing was buried in concrete: the deformation, how ever, was probably circumferential. Not much spring ing is needed to produce leakage under a head of 225 ft. In the last year before the case was repaired, the leakage was rapidly increasing and something had to be done about it, as the management feared building cracks in freezing weather. It had been proposed to line the entire scroll casing with cement-sand mixture but the point was raised that the lining might soon be coming out of the draft tube like cracked ice. because of the pressure rises, the idea was hastily abandoned. Then coating with metal, shot on the steel plate from a sort of spray gun, was considered but the final cost was high. Then a welding contractor was called in and offered to guarantee the job he proposed. The price was much lower than the metal coating process, therefore welding was decided upon. Every seam, where such riveted seams are usually calked, was welded with a gas torch, using the standard round wire rods. A manhole loeated near the entrance of the steel-plate spiral was left open for ventilation and a cofferdam put in that tailraee bay so that the air coming up through the draft tube and the runner, with the gates open, furnished a ventilating draft. This repair has to date stopped the leakage. The management at first considered welding around the rivets which might be considered most theoretically to be most highly stressed but this was abandoned on ac count of the cost, also because of the reduction in pas sage area that this might cause. Hanover, Pa. J ohn S. Carpenter. Magnesia Block Dust Prevention H andling of magnesia blocks and shapes is a dirty job, as the blocks give off a cloud of magnesia 'dust every time they are moved, or handled. When I was given the job of covering a large tank with magnesia blocks, yet not mess up a newly completed department, a problem arose. I found a good way to stop this dust was to paint the blocks with a coating of a solution, one-half water and one-lialf water glass, allowing the coating to dry thoroughly. No dust arose from the blocks and shapes unless they were cut. or broken. Springfield, Mass. B radford J amieson.