Document gDXVzR5jD2qkmr7w1481akJba

7b Be Sure of Fast I on Pumps Friendly I and Service | Compressors Specify UNITS By PENNSYLVANIA PENNSYLVANIA L.Sug. THRUSTFRE Centrifugal Pump Iof BoiUi Feetfng, Genrat Power PUnk |4 IndvttrUI Ula, BuffetIn 237-1 PENNSYLVANIA CUi7.ATMtor.4ri*eA Dry Vacuum Pump (Tillable In capeeiriat raegmg ham * I <fm (a 2,630 elm pltaa dlpla*aat Bulletin 191-1 PIPE INSULATION fram papa 7)0 large, especially if the pipe Is big and the price of boot is high. In such cases we may often ask ourselves: What is the permissible deviation from ihe theoreti cal thickness? Siudies show that lor all normal cases the theoretical thickness can be rounded olT downward to the nearest whole num ber. If weight or spoce considerations require a ehongo of the most economical thickness, the effect on heat loss must be analysed before a decision esn be mode. Basil. These charts are based on the standard heat-transfer and economical relations for insulated pipes and circu lar tanks. We do not have eufficient space here to derivo or present these relations, but they eon bo (ound in ony ol the standard volumes on heat transfer. Symbols used in this article are: Pi = price of insulation, 9 per It; X = insulation thickness, fiL; h3 = 'heattransfer coefficient, insulation to sur rounding air, Bin per sq ft hr F; D> = diameter of inner surface of the'insula tion, in.; Ch = cost of heat'loss, 9 per It hr; Ci = cost of insulation, I per ft hr. Editor's Note: Though the pro cedure suggested for finding dP,/dX in this article is theoretically correct, ex perience shows that there may be ap preciable variations in the values ob tained because each operator picks a different slope at a given point. A more accurate procedure is to perform this step arithmetically, finding the slope at the desired points by setting up the proper ratios of tsP\ to &X. PENNSYLVANIA CUi* A-AT Steen.driven Siegle-Stage, MoriaonUl, WatarCmMi Roller Bearing Alt Catnpraiior. v Bulletin 165-1 TOUR C*at < Crtrieg 346 VHtDt de.<rIVea All PENNSYLVANIA Rredecti ' *' . Write Fa. II Te4* * V ' '. PENNSYLVANIA Pump & CompressorCo. EASTON, PA. . OOnttAlR? oumcasB THBOSTFtC uacmek M3 WITH OUR READERS trim papa S of Strom. For verification you claim that the first issue of Power was during 1864 and was labeled Volume IV. Volume X was issued during 1890, so 4 from 1B84 and 10 from IB9Q both lake you back to 1680. As a well-known columnist would say, "Wanna bet?" I concede that II a person was born dur ing I860, he would be 4 years old during 1864 and 10 yean old in 1890. But a pub lication running yearly volumes and starting Volume I in 1860 would be printing Volume V during 1684. U Powea Volume IV was issued in November 1884, then it seems safe to assume that the first issue ol Steam could not have started prior to 1881. Actually though, Steam could have be gun publication in October 1882, under Volume I, issued Volume II in 1883 and Volume HI In 1864, When Posted took over as late as November 1884, It eeems reasonable to aspect that It would star! a Dependable STEAM GENERATORS This battery ol (our Ticothorm Steam Generators dependably and economically serves the power and heat requirements ol the 2000-patient Franklin Delano Roosevolt Veterans' Administration Hospital at Peekekill, New York.Ticolhenn Steam Generators are always your sound choice (or maxi mum sloam output at lowest operating cost. Write for details/ POWER NOVEMBER 1** ; Bpn Nelson stepped aside he revealed an interesting thing* about famous MacGregor irons Byron Nelson, left. Inspects finished poll ctub heads In the MacGregor Sports Products Inc. plant ot Cineinnoli, Ohio. He's neor one of the machines that is used In making the irons. It's colled, a broaching machine and ot Ihe time the picture was token It hod finished more thon 145,000 heads. When Byron Nelson stepped aside he revealed a lorge drum of Pure Oil's Koolkut S-7--the superior cutting oil used at MocGregor In this broaching operation. Because the dubs ore mode of lough stoinless steel forging*, the brooch bar takes o terrific beating. Intereiling to everyone with metal-working problems Pure Oil's KOOLKUT S'T8525**1'*51^'1581 Metal-working operations that save the most time are often the toughest on tools--surface broaching, for example. The right cutting oil is one of the most im portant factors; and they know that, ot MacGregor. So they use Koolkut S-7 and stretch the life of all broach bars. One of the great things about Koolkut S-7 is its mu/fi-purpose quality--making it perform ex tremely well on light as well as heavy operations. Pure Oil specializes in high-quality multi purpose lubricants--oils and greases designed to do several different jobs equally well. To help you reduce inventory, simplify procedure, and minimise waste and error. Use the coupon below for complete details on Pure Oil's plan to help you ... SIMPLIFY AND SAVE. PURI: OIL INDUSTRIAL l!FREE BOOKLET v The Pure Ofl Company, Industrial Salct Dej*,' B-311 I 33 B. Waeker Drive, Chicago 1, lilinoti . | PInn wnd me your Tree booklet on how to Simplify I end Sbvo.' ' . LUBRICANTS COMPANYaddrbssL errv _ l^ONE,____STAT &0 lure with Pure Bate* oftlee* loceied in mere thon 300 ctlte*. MdvdMgi Atlanta .,. Strmtnghom ... Choriettan ... Chortatie .. . Chettaneogo ..Cohimtan...fcidloitapdl...Jochonvffle...Modbofi...Memphh...MtamJ...MOwat*ee.'..Mteneepdh...Norfolk... P#a*elo...PltaburgH... Rkhmond NOVEMBER 1993 *23233