Document RjR9rYO51g07DYMLMZ567vkx7

gpm ond hu a capacity between regenerations of 58,500 gal. Treated water from the softening system passes through a vertical, spray-typo deaerating healer, Fig. 5, mounted on horizontal storage tank. The combination is capable o( deaerating and heating 125,000 lb per hr of makeup from 70 F to approximate saturated-steam temperature and hold in storage about a 20-ralnute supply of feedwater. Two steam-driven pumps and one motor-driven boiler feed pump pal) water from this heater'assembly to discharge into the main feedwater line. Feedwater flow to the boiler drum Is under the control of an air-operated 9-element regulator. A Continuous blowoff system holds boiler-water eoncen-' tratlon at a maximum of 2500 ppm. Total blowoff reaches 5000 lb per hr for the three boilers. Steam Distribution. Main steam header has two pressure-, reducing stations. Fig. 4, with bypass connections Installed. The first with a capacity of 120,000 lb per hr reduces steam from header pressure of ISO to 125 pai. The second station can handle 25,000 lb per hr, reducing steam from 150 to SO pai for service heaters and feedwater beater. Still another reducing station takea steam from the 50-pal mains down to 3 pat and supplies 18,000 lb per hr. All surfaces--piping, appurtenances,-apparatus--carrying steam, hot oil, hot water and hot condensate employ an 85% magnesia Insulation covering. Plant steam distribution consists of a network of several thousand feet of piping that extends from boiler house to quay wall. Branches take up from this point and supply out to iho end of the piers as well as any miscellaneous out lets along this length. Piping from boiler house to quay wall lies underground. All control valves, expansion joints and branch connections are in reinforced concrete manholes. Service leads from quay wall to the pier end are installed in the open below the pier decks. Standard-weight black-steel pipe, used throughout, lies directly on the ground, submerged in water or out in the open. It has been made immune, (or all practical purposes, to the action of water, gas and alkaline agents os well a* to electrolysis. A patented type of insulation, known os Durant, was opplied. It covers the bore pipe with a double thickness of 85% magnesia sections. Over this comes a one-ln.-thick coating of poured high-grade asphaltum, with a melting point of not less than 2300 F. A galvanlxed-ateel sheet, 24 gauge thick, protects the asphalt-covering. Arrangement of pipe and eoveriog permits free expansion of pipe with injury to covering. The pipe does not bear directly oo lotion but intermediate blocks and guides carry pipe wei The open piping oh the piers has the same material ( covering plus o hentfy bitumastlc coating. Air Supply. Two reciprocating horixontai-duplsx ' water-cooled air compressors, Fig. 5, esch deliver 1341 < of free air measured at 60 F and 30 in. Hg. borot pressure. Air froip the outside passes through an I filter and discharges through an aftercooler to a vet steel tank receiver under a pressure of 110 psi. From ll receiver, cir goes to the various points of demand along i distribution system under the control of valves. < Water Supply- Two series of piping make up the wit II distribution system. They carry through both on the ikpl II and on the piers. One, an extension of the 16-in. hi|| 1] pressure main, goes for Industrial service. The other eileai |j the low-pressure system for domestic use. Hose outlets); I1 both systems permit takeoff at intermediate points. Several miles of various pipe sires were installed on thd I. systems. Underground, on-shore lines consist of esst-hn |j pipe with bell and spigot connections. There U ond exce |, lion--the mains to. piers 4 and 5, have about one mile- 16;in. reinforced concrete in lieu of the 16-in. cast iron. *, On the piers, outboard of the quay wall, siandard-wd| I] seamless steel pipe, treated with several applications' I* bitumattic coaling, serves beneath the pier deck. Spao risers project from the mains through the pier deck i II terminate immediately above In hose-valves where they nu^l) convenient connections for adjacent ships along the pler^ Downstream on 'the base main following the coansetj; to the city-water mains stands on elaborate, especially signed backflow-prevention unit. Its tote service is to kt city and base systems separate. Moin control valves for the 16-in. industrial systems 408-lb ferro steel, wedge gate ones with horizontal rising stems and with gearing In grease-filled houi These housings are installed directly in the ground cast-iron roadway box marked over the operating nut The above described power-service program forms part of the full-base facilities. It has been built in pation of on eventually greater demand than ever before Three power plants and connected service-supply form the major sources for base needs. These.earlier lations are somewhat similar in construction, size and oil to this recent addition. MAJOR EQUIPMENT IN POWER-SERVICE SYSTEM Naval Operating: Base, Eleventh Navel District, San Diego, California STBABS SQUlPKBNTi BolUrv. S................................................................................ lfata tra Work* 40.000 lb pr hr. ISO pit. MturatuS. I-Srum, bMub* Bumtra, ell, 0} I per teller...........................Pttbrif BngltiMriog Cerp OtfUlj* miring, r#m vemhlng, type AS. ell Oll-eapply unite, eell-cmtelned............................ .Otcce CeaitracUen Ce Including pump yeeemor. e<t>temp rayuleter. elt-rellef v1*e Cot&biutloa centre!. 1............................................................ Belley Meter Ce Air^pcrated, automatic, metered-type, ful-ie-elr retie Pent, 1, Id, I per boilers JJ.000 dm...........................BeSele Perse Ce One tneter-drieen, OB Ce; I turbine-driven, Terry Steen Turbine Ce Pumpe, ) feedweter, deliver SOO-pal water... .Warran Steem Pump Ce One motor-driven. OB Ce: * eteem-driven. Werren Steen Pump Ce Peedweter controller, I, etr-eperated. Abatement.......... Batley Meter Ce WATBR TRBATMBtfT: Water eeilener.................................................................................. Cbamco Inc Preee eeellte water-trcatlnt eretere: S eettenere SS.S00 fat tech Cooler, evaporative, t............................ Worihlnfien Pump A. Mach Cerp 160 sptn. IIMJ P, U-4D pit Deaerate*, I. IIS.0M 1b per hr.......... Werthlojtoe Pump A Makeup eupply TO P: outlet water at letuteted etcam tcP Preesure-reductny eiattene. S........................................Pleher Oev One tSO-tlS pet. I SO,000 tb per hr: "% 1*0-30 pel. **.000 Ik one SO-S pal. 11.000 lb per hr ,, *,t ! Zallaa Brea /< ,,u B.pan.i.n .......................................... Dlilricl *-X COUPRBSSBD^AtR SVPPLr: Cempreeeere, S, reciprocating..........................................lepiitU'I Korieontal duplet, 1941 dm, S-etage, waterceoled, meter-driv^fl PIPI/ra. VALVBS. BTC: Cett-iree piping........ .............. lnauleted piping... ................ Velvet end Bttiage.................... UISCBLLARBOVS: Kleetried epedetitei.......................................................Oeoeret BtertrjJ Conduit, lunetlen beace. fneee, etc 104 (470) POWER Augd1'! JOUIBtLITY OP OXYGEN in woter It quite high ot low tern- higher, the pressure, thj greoter the solubility. Oeeerotion peratures, ond ot the boiling point It oppmoches sero. Tho ot low temperoiuro must take* piece ot pressure thot is low Rid Water of Dissolved Gas To Stop Corrosion Water that contains a gas like oxygon or CO* can damage boil?**' heaters, pipelines. Lacking a deaerator use scavengers ! b*orb the gas, or Inhibitors to prevent attack on metal By ft C ULMER, YocSnieaf Director Power Chemfcefi OMs/eri, C f Drew A Co, inc j, 7^*'TM casts like oxygen, carbo e' tmoaia and hydrogen sul m-L.Veriou`1T corrode plant equlj g l**tt hoadlee water, steam or con .te* Dissolved oxygen normal) *rT00* cUls. Carbon dioxide am Uc^cn, ,ulphide cause general at ttet j0a. ferrous and non-ferrou Aoma t* Bering the solution's pH fc--_ 8 causes general attack on nor ""idid'hulj :^ *ncrea,'nB U pi eeu^ * * rdaed appreciably abov {>?*** A,.___ _ .*. Auguti 1948 Tito action of each gas is not always as specific as stated. Corrosion may often result from the combined effect of different gases, for example, dis solved oxygen end carbon dioxide. Here the lowered pH caused by earbon di oxide greatly accelerates the pitting action of dissolved oxygen. absolved Oxygen. Water in contact with air dissolves oxygen, river and lake waters normally being saturated with it. Water-from wells and domes tic distribution mains is usually not saturated. The graph ahows solubility of dissolved oxygen at various tempera tures and pressures. Solubility is high at low temperatures and approaches zero at the boiling point. The higher the pressure, the greater the solubility. The feelers affecting solubility are used in removing or eliminating dis solved oxygen from water. Deaeration, the commonest method, boils water and st the same time breaks it up into thin films or small droplets to facilitate oxygen release: When deaeration lakes ptaee at relatively low temperatures it Is called vacuum or cold-waitr dcaera (tan. Principle is the same os deaera tion at or near atmospheric boiling point. From the graph it is evident that oxygen solubility does not ap proach zero until boiling is reached. So it is extremely important that the healer or deaerator temperature be In creased to this value. Ev4n though deaeration may be effi- (491} I0S