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ARGUMENTS Here's the place to unload your gripes to edllort, manufacture^ and fellow engineers Mere Bllgewater SunrACEBLOw's November story bis jflaw, and it seems to me to be this: Safety-valvo-raeehanism Inertia may allow steam header pressure to drop tUghtly below 232 psi, but not enough^ to stall the engine. Reduced presaaji? should at best slow down the propeller,`j as propeller resistance drops with tltaq square of falling rpm. Bllgewater on snap decisions! K A Traub Detroit, Midi. Hoot, Monl Dinna Ye Hao Fire Under Yere Bller? Bllgewater on Marmaduke's Popping Safeties! Noo, Marmy, what I want tae ken it this. Whit kin* o' boilers did the shup in your November ytm hoe, when the safety valves popped at ye taid? The fteam went up the escape pipe, an' very little to the steam line. Lord all michty, mon, wit the steam line connected tae the safety valve escape pipe? A schiilbaim kens that pressure is pressure, and In confined placet like bllere, wi' steam lines connected, the pressure Is everywhere. So if the safety valves popped wi' aboot a drop in preisure o' five pun' there wad still be sroon 230 pel at the steam chest. Noo, there It a possibility that the engine michf step on dead center, if, and only if, tho throttle valve (butterfly valve at ye ca' it) swung shut during the vibra tion caused by o ratin' engine. This cud be so, owing tae the rattle traps bilt during the war. (Editor's note: Butterfly valve had not moved.) Lookin' at it frae a sensible p'int, whit wux yer puston clearance on yere high-preuure cylinder? Anilher ques tion. Whit wux the lead on yere puston valve? I'm askin' the questions at I've seen terrible valve soilin' din. Equal leadi, Huff and nonsense! Did ye never tak* yer engine apalrt? Dohal' Clehcannon S S Inchcapo Ctutlo J (Brother of Colin Cteneannon) ' Ah, roosti to this mon Marmaduke, tbs(suriaceblowerl Wi' all his blather h November aboot high steam and bt' steam, inny tburrd-closs oiler wi' eyes' in bis noggin wud ken that os long u; the old ship had headway, the drag of the propeller when she bits tha drink wud turn tho old grinder off dead eester. WI* his poppin and apoppin o' his, safety valve, dinna he hove no fire un der his bller? U old Manny wud lay ofla that cooeoetlon of lye and bilgewatsr he swi|i as Sandpaper Gin, and stlek to tho pure, sweet taste of Croggins' Mountain Dev, he wouldne do slch toll explaining Coufl CUENCANNON 55 Inchcliffe Cattlt CORRECTION! On p 142. Dee Power, J C Perrante uys, "ll reads sere when motor Is dry.* This should he, MCood reading b one megohm or better per 1000-t motor rating.* Bock fot Cooling -eliomOtr Valve Flew Reversed? Normally blowdown valve is arranged with the flow reversed so pressure Is against the bonnet and closing the valve. Thus, in she event of a broken valve stem, the valve will close. We ore, therefore, of the opinion that the arrowa showing flow through valve, (fig. left), should be reversed. W Ryan Salina. Kon. Editor's hotb: l( this valve waa in stalled with tho pressure on lop of the disk instead of the way wo show it, we're afraid the boiler operator would be in (or trouble. For one thing, when he got ready to blow down his boiler, be would not be abio to open the valveReason is that the opening above the disk would act os a trap for sludge and sediment. Eventually il would harden into a mass, making it impossible w. blow down the boiler. Bealdes that, ** believe there Is codo requirement tbst volve must be installed as shown. Blowdown valves must work when they are needed. For this reason, soda o! the older blowdown valves on mariM boilers were the port type. There ws* no seat to collect sediment and stick- Let's hear from readers on this. RIANT OPERATION ANO MAINTENANCE SECTION fOW* WHICH ONE ? De Laval Oil Purifiers are supplied in types and sizes for every plant need, rill types . . . straight Oil Purifier . . . "Uni-Matic" Oil Purifier .. >or "PuriFilter" ... perform the same basic func tion equally well--they.all throw out of the oil by means of centrifugal force, all solid and liquid impurities. But each machine has its place. The straight Oil Purifier is used where it is desirable to install separate pumps to carry the oil to and from the purifier.This type of De Laval machine comes ' in the widest range of capacities, from 5 gph to 1800 gph dependent on the viscosity of the oil being purified. The "Uni-Matic" is built with its own pumps. When necessary, a heater is also supplied. It is ready to operate aB soon as it is piped up to the oil supply. The "Puri-Filter" is a complete De Laval "Uni-Matic" plus a set of three or more filters. The filters remove colloidal carbon and other minute con taminants that get into diesel oil, or re move fly ash from turbine oil. Because it combines centrifugal force and mi cronic filtration, it leaves oil visibly clean--practically transparent. Its ca pacity depends on that of its basic unit --the De Laval "Uni-Matic" Oil Purifier. cDE tHE DE LAVAL SEPARATOR COMPANY Poii,hkpdf, NiwYoill 487 Randolph $1., Chico A 0 LAVAL PACIFIC CO., 41 B..I. St, Sn Fnmitco j THE OE LAVALCOMPANy,Unll.d,PMfhoiou,h,OoL LAVAL OIL PURIFIERS rk more dependable power production ; JANUARY 1951 U7