Document p2rrn8xE6vJzR92nXyoX2Mao7

More PLANT PROBLEMS. Code requires spring-loaded-typa safely valve, sealed ice open al a pressure not greater than IS pal; Determine size from grate area, as in the code. Don't replace nonreturn valves be cause they wilt operate on any pressure. They'll serve both as check and si stop valves. Install new steam gages calibrated st twice the pressure, or to 30 psi. Remove all steam-reducing valves from the lines. If stesm piping run is long, it may be ' by testing boiler at lowest suitable pres sure for besting system, after the new safety volves are installed. Test may show there is a capacity limit or that piping alterations are needed. LIP con find boiler output by meas uring system returns, weighing cnsl fed to boiler, and computing evaporation or computing steam output as 3 lb per hr per sq It of healing surface. C W Bell, $r Hazleton, Pa. necessary to increase pipe size to pre vent excessive pressure drop. There is no need to revomp the heat ing, system because it now operstes at 5 psi. Allow condensate from vacuum and gravity returns to flow to a receiver before pumping it to the holler. Uae o float-operated motor-driven low-pressure centrifugal pump for this service. Feed makeup from city-water system to con M6ATINO SYSTEM will require same Btu output after pressure is reduced, as before. About S15Q.lb-per-hr steam it required after pressure is reduced in the boiler. Pressure drop through the 6-in. boiler lead is about 0.3 psi per 100 ft of pipe. UP may find he must increase line site to reduce pressure loss. A H Moulton Pittsfield, Mass. densate receiver, if local laws do not prohibit such a hookup. \\ AN EXPENSIVE JOB U in store (or UP .Simplest way to find boiler output is if he reduces his boilers to low pressure. to install water meters and thermome- Safety valves 'must be overhauled, fitted ters on condensate return to each boiler. with new apringt end reset. Check non Lastly, if you're using a stesm whistle, return valves to seo there is enough it may be neceasary to lake it oft the pressure to lift the disks. steam line and then to fit it to the com- I think a vacuuno-return system is bel preaaed-air system. ter than gravity because it eliminates Ccoacc Hill Sunbury, Pa. sluggish lines and permits use of smaller return lines. Install a steam flowmeter JOMfi IAFITY VALVES are auiloble for conversion to low-pressure service. Before buying new valves, check with manufacturer to see if yours are. Be and a draft gage to make operation easier and more dependable. A A IIUNNKWINKEL IPoodsiock, HI, sure vslvea you choose have enough ca pacity to relieve properly under tho new firing rale. Nonreturn valves do not need any changes. CHANGE FIRINO RATE of stoker when boiler pressure Is reduced. This pre vents unnecessary safety-valve popping. Remove present reducing valves-thot cut steam pressure from 125 to 5 psi. LIP's existing piping appears large enough to handle the low-pressure steam. It may be advisable to change some of the gravity returns to vocuum UP should consider installing a 3* element combustion-control system to regulate feedwater, fuel and oir to main tain proper firing rates at various loads. Cost of a simple system like this is more than offset by fuel and labor savings. to assure prompt return,of condensate Safety-valve setting will have to be from system. changed- UP may be able to use the Determine boiler output by weighing cosl fed to stoker hopper. With this and the healing value of the cool known it is easy to find output if you use the equa same valve bodies U ho changes the orifice size and spring. See so fety-vulve manufacturer (or recommendatinna on orifice and spring site. tion given In the ASME Boiler Code. H A Kaisrr Clfndale, N. Y. Check nonreturn valves.. Force on underside of disk may not be enough to lift it. Valve manufacturer will recom mend eny needed adjustments. Don't BOILED INSURANCE companies and make any changes without first cheek state codes require strict adherence to ing with the ASME Boiler Code, stole their rules. Check your insurance com ond local laws. pany and code before getting to work. If combined pressure drop ol steam Present safety valves esn probably be and condensate systems exceeds the fitted with new springs to handle about available boiler pressure, a vacuum- 2000 lb of the required relieving capac return system is needed. De sure pump ity. Remainder of capacity can be as is specially designed for this system. signed to two new valves on a Y. Find maximum stable steaming rate H B Waync Brooklyn, N. Y. (Continued on page 136) --YOUR NEW 1 Hew Can We I These Valve Leak Valves In lines to eur t*0 pressure feedwater heau^'S when load is law. These v ore In vent, steam and d lines for the heaters. riant Is rated at 400,000 Air appears lo leek thro volvo pocking at the gland. Tl Is some leakage at valve it New peeking doesn't much. Air thot enter* threiiW valves shows up In our coadanJ sers, hurts plant performance.^ Slnee most of these valves am usually kept fully open or faDyJ closed, we've bean woaderlag'tif)' reversing them In the line wovU] help. Flow would then ael afilc&j lop of disk of these globe vthm' Instead of bottom, as It aew does? - Condcnsolo on top of disk weald] help seal It while the vnUe'jhT closed. Or Is there a better In stop IcakagoT---CO 2 How Can We Find ^ Underground Valvei]| Our hospital lias over 100 bulld-g Ings on 1600 aeres of Ismj^j Water-supply pipes run ender-L- ground to oft parts of the hospb'j tal. System is quite complex- Several times wo have had ; locate underground shatefl.j valve* Jn a hurry. Because have no positive system for fl tng the valves we've wet water. Isolated the wrong bo log*, and had many delaysProblem la further ecmpli cated by- system changes marked on our blueprints, jwfy stmncl turnover and poor ind*y cation on our drawings .of *b*j Is also some leakage , What I'd like to do I*, straighten out this mess without having to dig up every pipe ' volvo we have. Then I'd Ilka place unobtrusive markers f* the valves that will no* Interfr*y3 with lawn mowing. .1* Ilow do Power readers run#lnJ|| large plants mark their velv V| What system 1* best for quteW | showing whlidi valves should he,,j, closed to Isolate one building a groupT---BL IViSi you help readers who sent w ETjfe' Urns? Extra pay for photos or \M KAMI OPERATION AND MAINTENANCE SECTION M BSg^ROBLCMS. The production items by Rons Plastic .slowed down by an insdeSySiftiie'ail. A awltoh to Sunvis 999, fffSssffi.'ttfored h to normal. PRESSURE LOSSES ENDED. There are few plsslie molding machines as big so this 60 ounce modal. It exerts a pressure of 1,000 Ions. Because the hydraulic oil formerly used sludged up and thinned out, it could not maintain this pressure. But SunVis 999 has fully met these severe requiremems, as well as those of Rons's nine ether hydraulic machines of varying sises. pTIC MOLDER'S BOTTLENECK ENDED It BY SUNVIS HYDRAULIC OIL j^^wfs/eai-ago Bona Plastic Corporation, New York. fl^Kid.irouble with ila hydraulic molding machines. fttfescHine* functioned erratically due to oil sludge Mini the control mcchnnisnis. fn addition, the oil ud*oii't excessively at normal operating temperaBibd,!resulted in the Inaa of proper clamping preaE^co'lhe dids. To keep the machines going at all, it mixeemry to drain, clean, and entirely recharge (he KSps-ai frequent intervals. fA'Siln^renrcsentntive, called in by Rona, studied (he rUioarid recommended Sunvis 999. He knew It would put an end to pressure losses, because, even at elevated temperatures, <t does not decrease in viscosity as much as most other oils. He also knew its exceptional stability would end the sludging problem. Sunvis 999 proved to be (he answer to all Rona's hydraulic oil problems. The original charges, with mini mum moke-up, ore still giving good service. Rona can expect the same performance for a long time to come, because experience shows that tinder normal operating conditions, Sunvis 000 Series Oils ere goodfor the life of the equipment. Deportment P-4 Sun Oil Company, Philadelphia 3, Pa. I am interested in knowing tnoro about Sun Hydraulic Oils. 0 (would like tn consult with a Sun representative. O Send the booklet "Hydraulic Fundamentals and Indus, trial Hydraulic Oils." Nainn _ ------ Title. 111 g.S&CHANGES HAVE BEEN NEEDED. Before Sunvis m^*,*>9p(ed, the oil in each of the machines had to be changed j25yMlhe one pictured Holds 450 gsllons). Tho original Cjft^J.Saovii 999 hive been in use now fpr more than a year. .State. I___________________________ _______________________ | TECHNICAL ASSISTANCE AVAILABLE. Sun's engineers ! are it your service for consultation on all hydraulic oil applica tions. It will pay you to utilise the experience they have gained in solving s wide variety of problems in many different industries. SUN INDUSTRIAL PRODUCTS jjft,.,l* 011 COMPANY, PWLA0&PHIA 1. PA. . SUN oil company, ltd., TORONTO AND MONTREAL fUNOCJ