Document B8vnpwok8Z7OzMv80daaOo4r4

More PLANT PSOBLEMS. iflfOini m I TIOHT6N NUTS with full pressure on the boiler. I've never fell it wot unsafe. If gasket leaks badly, take boiler ofl line and allow it to cool. Drain enough water 00 manhole can be worked on. Install b new gasket after cleaning bearing surfaces. We usually coat our gaikets with a mixture of cylinder oil and graphite. Seal gasket evenly all around and pul) up nuta evenly. Start fire after filling boiler, and waft until there's full pressure in the drum. Then lighten nuta again. C H Eloert Irvington, NJ. CLEAN BEARINO SURFACES before re newing gaskets. This is the moat im portant atep in the job. Draw up nuta on all manholes after running hydrostatic teat on boiler. Draw them up agoirt when boiler pressure is close to normal. When boiler la out of service and not carrying pressure, you con draw up nuts again. A A HuNNEWiNKBi^tFoodjfock. III. RUN HYDROSTATIC TEST before firing boiler. Water pressure should be about one and one-half times, normal steam pressure, temperature about 150 F. Tighten manhole nuts until all leaks stop. After test, raise steam pressure low* ly. Leave uir cock on drum upeu until all air is purged, then close it. Msnholes won't lesk if you've tightened them correctly. Tsklng up monholc nuts wish hydro static pressure on boiler la safer than with steam because if anything blows you'll only get wet instead of eealded. It's the most sensible test. Open air cock as soon as you shut down boiler. This prevents s vacuum in drum, which may cause leaks in piping valves and joints. L E PoLitcoFf Brooklyn, N.Y. EoWitRP Dzlnicx Brooklyn, ft.Y SERIOUS ACCIDENT in our plant taught us that wailing until boiler had full line pressure was wrong. We now start tak ing up elock when boiler pressure Is 25 psi, and eontlnue at intervals of SO psl until lino pressure is reached. Faeo Thomsen Milwaukee, JPis. SOME ASBESTOS OASKETS shrink if stored for long periods. This changes contour. Stretch gaskets by hand before installing on manhole. Check how much nut is pulled up by measuring stretch of manhole bolt. You can figure s'retch needed or obtain It from a table of bolt properties. We make uur final pull-up with s few pj ^ boiler and get good results. C E Boyhan New York, By USE MIRROR to examine drum iei surface from outside. Smooth say ^ with emery oloth. Deep nicks - grinding of sealing surface with equipment that allows grinding whftjl follow maahole contour. 1 Don't use gaikets more than % Use dry graphite on both faces of 1t gasket to prevent sticking when 1 hole is removed. Pull up monhole _ when boiler is cold and as soon ai appears after you start to raise sta on the boiler. If no leaks appear, pull up nuts hi when boiler is at line pressure. The^ no danger in this practice. FA u have better results with spirally v^a gaskets. Use them dry or as the mu lecturer directs you. J J .Ceist Brooklyn, N.Y OTHER READERS sendine answers, wh* -we omitted because of lack of tpta are the following: A H Moulton Pittsfield, Man.'. A J Brf.ucblmans New York, N.Y. YOUR TWO NEW PROBLEMS FOR FEBRUARY 1 What Causes FeedPump Vibration? Oor 4-tage bollcr-feed pumps ar designed to handl 6S0 gpm of 300-P water at 2400 rpm with 209-fl suction head and 1 L93-ft discharge head. Head developed by pnmpi was to be 984 ft. FIret pump vibrate* seriously at speeds between 2150 and 2200 rpm. Second unit developed same condition after running a short time. Third pump now does the same offer running well for three ycors. `Balancing drum and shaft sleeves on Ho. 3 were hodly worn when we opened It. Replacing them hasn't done any good be cause pump sill) vibrates. Our operating condition* are not tho same as design values used. Suetlon head Is 223 ft* die* charge head 1033 ft. Wbat causes this vibration? Haw can we stop it now1-0P 2 How Many Men far Maintenance Work? Within obout a month our new industrial plant for manufactur ing chemicals will be ready to begin production. It has close to 4000 eleclrle motors ranging from fractional to 600-hp units. Right now I am planning my maintenance crew for electrical work. We will do oil ordlnory maintenance jobs, but will send out heavy eoll-rewlndlng Job*. Besides these motors we will have modern lighting through out the plant, several elevators, complete olarm systems for proc ess vessels ond numerous auto matic controls. In planning my department I'd like some help from Power readers In choosing the number ond type of men. How many foremen do we need? How many master electrician* and helpers? What's the best way of finding number of men needed for each Job?--Kt i i i- N Don't miss next month's problems. Another chance to use your ingenuity Will you help readers who sent us problems? Extra pay for photos or sketches ue PLANT OPERATION' AND MAINTENANCE SECTION row* As an engineer responsible for efficient, eco nomical plant operation, you know only too well that corrosion of steam and condensate lines can send costs skyrocketing through pipe replacement, interrupted production, and in creased labor and maintenance. Perhaps you, like many other engineers, hove tried slop-gop methods to check the problem only to'find them partially effective or far too coatly. Realizing the importance of tiiis major indus trial problem, Del* Laboratories has developed its patented filming amine treatment. Here, at lost, is a simple, inexpensive, and practically 100% effective method of eliminating this costly ond production-disrupting headache. For examjiie, a linoleum company, operating ot ISO psi and producing 300,000 pounds of steam per day, employed sodium zeolite sof tening for 0 high bicarbonate row water. The carbon dioxide content of the steam averaged 40 ppm. Continued maintenance was required due to failure of condenaate lines from the steam kettles and unit beaters. After the film- ing amine treatment was applied, maintenance records showed an annual saving of approxi mately $8,000,001 And, a large part of this saving was obtained by eliminating weekeud over-time work on pipe replacements. Why not tajee the first step toward ridding your plant of corrosion note? Call in s Dels Engineer. Ask him to show you how Bets Specialised Water Conditioning Service can help you.,. quickly... economically... effectively. W. H. & L. D. BETZ, Gillingham A Worth Streets, Philadelphia 24, Pa. In Canada: Betz Laboratories Limited, Montreal 1. See for yourself how Bets filming amine treatment eliminates re turn line corrosion and reduces operating costs. Send for Technical Bulletin No. 124, BETZ c o N s U l. 1 A N ] T s 6 'N Alt IV A T ,f: R t' R O H l' ' ! M S HMtJAftY 1953 139