Document B20z1dvNQK9N157pVOJxavbX

American Society of Heating and Ventilating Engineers Guide, 1930 In order to determine heat losses per linear foot of pipe from.known losses per square foot, it is necessary to know the number of square feet area per linear foot of pipe. Table 2 gives these areas for various standard pipe sizes while Table 3 gives the area in square feet for flanges and fittings for various standard pipe sizes. (R. H. Heilman, Mcch. Eng.. Vol. 46 [1924], p. S93) Fig. 1. Barb Pipe Loss Curves INSULATION OF HOT WATER, LOW AND HIGH PRESSURE STEAM LINES The conductivities, in B.t.u. per square foot per hour per inch thick per degree fahrenheit temperature difference between inner and outer surfaces of the insulation are given in Fig. 2 for various insulations. In this figure the conductivities are plotted as functions, of the mean tem peratures or the mean of the inner and outer surface temperatures of the insulations. This method of plotting conductivities, enables one readily to calculate the heat loss through single or compound sections. It should be empha sized that in this figure, the conductivities given for the various insula tions are the average values from a number of tests on each type of 406 T able 1. ossesL from H orizontal Bare ron Steam PipesI Chapter 24--Insulation for Pipes and Surfaces SissssssgSBsassssssss 3a S fl JO l!S8=lliH!||!|||f! 3 13 . sS355S1135SSS5S33SSS5 fzSasasassssasRSssssss 5 11 33 usiiiasiispSSIB 5 33 SSS!S8SSSSSS9SSSSaS38S9 1 I t S12l5sls5l?lll?si|||| % 2552523555ISS3SSS1 fia 1 33 ' 33 iSisasssssssssascasag!? ssisllllliSllililUB 3SSS33581?8S318aS38?- f3a 1 33 S t1s 3 33 52SSS532Sa5!gSSI RlSssssaaassssasBsagg j 1g 33 asasssiisiiiiiiiiiiii U sssssksssssksssssssss I ISu* I#*! 31eS8*aas88SR688aaas^. fa 1f1l3g 33 SSS382ilIS||Si|5||S RSRaasiaaRaKSsaaRSsas^ - 31 407