Document jyJXQ6NYgODDNry6xkRmKVKQR

J. 'I X I ,, I 1 Johns-Manvillc SHEET and BL CK INSULATION for heated surfaces (continued) Asbestos Roll Fire-Felt (For Temperatures to 1000s F.) A'In>Io> Koll I'iic-IVII I- ;i Oil. lloviMo Ml for insulnlinir hi`a|i'*l vui'fiiri ~ hIh-m1 sp.icr io's ol jiurmil (he use of thicker or mini' ucul (mm - of iii.ulalion. This malfiiil is ini ot-lo-il rV.', *. ami 1, io. I lark, in rolls a ft. wiilr, coiilaimm: about 100 m). ft. Uoir;tiL, about 1.2 lb. |*cr m|. ft., '< in. (luck. Super Firc-Fclt Asbestos Blankets (For Temperature* to 900* F.) A Idanl.et - .tie m 41 f <f<ill <1 n-hr- I tis. i lot h Id with a-lte-lft' hhif* ami 11111-t with wne at rh iulriv. U inr hi iil.diiir ii tepid.11 mii f.u * - vvlinc . aldv rm ahh- HI-111.(I Mill is 1j.-sin*i|f such a- pa|T dgMer shelU .1 >l am luthifir ca-mg-. I* unu.iii'i| m -ingli* nr double Inver tun liue'inii, 1*^ *n* thick. Made In Mid the individual installation. Ucco- inend.itjoiis on icmpt of details. Sheets and Blocks (For Temperature* 10*700'' or 1000* F.) * | `l l( IS ,1 hj'Jhl \N *l)` ill, CllicilMtl, iltMlIil* I urn made uf felled aidw-in* him-. U-t`{ lor lining Itoder IuIh* floor- and tin* an* on ventilated furnace wall-, ami in olher location < where the iM-ulatiim may Ik* subjected 10 vibration or to Minins cau-ed hy espauMim ami cmilractnm. |'*MriH-Jieii in -lneN *J 1 \ ``.r. in., and Mink- i` \ .'HI in., 10 *1 in. thick. al'O in -penal m/.i - ami ii regular -.hapes to Older. Wright, about 1,7 lb-. per m|. ft., per inch thick. Temperature limit, if elfeeliwly .'iippntied between uu tal sheets or huek hump rim) -terl -hi ll, 11NUI** V. If less eiftv* lively supported nr Mihieeieit to removal am! replacement, 7<ur I'. should he considered tin: tvmporature limit of the materia). Banroc Blankets (For Temperatures to I000n F.) itnnroc lUankel- are made of Uanror (rnrk wool) fellv*! heiuren variou- l.ihiie-, ii-ually metal, Mieh u galvanized wilt* iii'llm^, pperdii ai mg nu Ini lath, am! rih lath. 1^7I for ihsulntitig men- ami for -innlar pnipo-e . Standard >i/e. of most types, Jl \ ! in. ami Jl x IS in,, in thicknesses of 1 to 0 in. J*M Aibctiot Turbine Blanket Thd ** be rcdthly removed replocod Improved Asbcstoccl Sheets and Blocks (For Temperature* 10 >00 F.) imptmi-d A-hediivrl shivts ami block-, made of altrmaU plain amt enrrupale*! .i-Im-Ao; f* lt - hudt up to Varimw Ihn k !# 1'., am 11 f'd lor hi ulalwip bin'll iipiipiiii it a law pie* sine hmlci , |.| 11 al r la-.diT- ami u.mii air ilm lv l`m intii d * land.ml in -1 phrv |mt ineti nf ihiekne** in a/r h. *1, \'2. !*< and '.'X* in. v. (** hy 'd <*r 7'J 111. Imtr, (mm ' * I t in. (lin k. WYnd'l. iilmiil J II*. p*r -|. II , |er mu h llnek. I in eoi 1 upatid maleiial uilli It plies; jht in -It 0 al-< at ad,tlth produced JM-83 Banroc Blankets Showing tome of the becking* evtilebi* Asbestos Paper, Roll Board and Sheet Millboard .lull Vs.M twini: fill Ml-Ill's ,1 rom|.lil.- Imr of ;i |r I'.il.rr liw'ii'lit-. I'iimii I* In .'! II. |ti r 11 <i .t|. I'l.) ; ;i l--li roll Imi:ii'iI (.`V, .'ii'<l ' in. Ilurkll ;im<) ;i ln'-tn. .Ii.rt mil (l/V/Jio in. I lurk).'riu".i-|ti'o.lucl - ;nr n t'omnnt|itl, wliorr n-l.itis-i-ly (Inn |>rolCi'lion n^;iin>i il.imc, lirnt or ac fumrs is ilcsircd. XO INDUSTRIAL PRODUCTS JOHNS. MANTILLE processing of oil* and chemicals. Such close temperature control cannot be maintained without adequate insulation to reduce heat tranafer. Thickness of Heat Insulation The economical thickness of insulation depends primarily upon the temperature and the cost of heat. Thickness is ordinarily computed on the basis of fuel costs and operating conditions so the heat which passes through the insulation is only that portion which can not be economically saved. Sometimes special conditions require thicker insulation than warranted by fuel saving alone. The economical thickness of pipe insulation also depends on the pipe size. While it is a fact that small pipes would have to be more heavily insulated to give the same saving of heat, it is nevertheless true that the larger pipes should be provided with thicker in* sulation in order that the maximum net saving be realized. A 1" pipe with 1" thick insulation will lose beat more rapidly per sq it of pipe area than a 10" pipe with the same thickness of insulation; because the outside surface of the insulation on the 1" pipe is nearly 200 percent greater than that of the pipe, while the outside area of the insulation on a 10" pipe is less than 20 percent greater. As a result of the greater area through which heat may flow, the losses from the 1" pipe must be greater. The matter of net saving takes into account both the saving per year and the cost per year of effecting that saving. Therefore, since the insulation on a 1" pipe costs from 1% to 3 times as much per square foot of pipe surface as on a 10", and since each inch of thickness on a 10" pipe saves more heat than the same on a 1", it is at once evident that it pays to put a thicker insulation on a 10" than on a 1" pipe. tion across them will be at a minimum. Small void size is particularly important at high temperatures because of the rapid increase in convection and radia tion with rise in temperature. From the five mineral products--asbestos, magne sium carbonate, diatomaceoua silica, refractory clays and mineral wool--Johns-Manville furnishes insula tion in the forms of sectional pipe insulation; insulat ing sheets, blocks, bricks and blankets; insulating ce ments and fills; together with accessory finishing materials in the form of cements, coatings, papers and felts. Johns-Manville offers a complete line of insulation materials for every kind of equipment used throughout the entire range of industrial processes where tem peratures vary from sub-zero to 3000 F and more. A few of these materials are shown in the chart below. The recommended temperatures are those applied to the insulation, rather than process temperatures. Selection of Insulation To be adaptable, insulation must be of such form as to be easily applied. It must have heat-resisting qualities sufficient to withstand successfully the highest temperatures to which it will be subjected. It must be sufficiently strong and durable to assure long life. Adaptability also depends upon many other conditions incidental to the particular application. The insulating value of a commercial insulation de pends primarily upon the small voids which it contains. In order to be most effective, the voids must be enclosed and so small that circulation within them and radia IM.0 MHllNNlir JJkf lnsulMiag Mu*ri*U cvr tfa entire raift / mdmmrM umpwmurvt Bt-1 INSULATION BBQDllfiiP Jll -83 <aai scvi r>tMa* to ujla.