Document 0LLqxRV0pzRqrYyQEZ0dnXooV

American Society of Heating and Ventilating Engineers Guide, 1929 be taken as equal to 95 per cent of the values given for the 18-in. pipe in Fig. 1. 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 pier 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 pipie sizes. (R. H. Heilman. Meek. Eng., Vol. 46 [1924], p. 593) Fig. 1. Bare Pipe Loss Curves 1 INSULATION FOR COLD SURFACES The data appearing in this section are taken mostly from the paper by L. L. Barrett1 which was presented before the American Society 9FHeating and Ventilating Engineers in 1923. It is the common practice to insulate cold surfaces for the purpose of preventing sweating even when the question of the heat gained by such surfaces is of no economic importance. Moisture will be deposited on a ^Insulation of Cold Surfaces to Prevent Sweating by L. L. Barrett, Transactions A. S. H. & V. E., Vol. 29. 1923. 248 0.815 0.990 1.18 1.48 1.67 2.05 2.46 2.91 3.30 3.70 '4.07 4.45 5.29 6.09 6.84 7.60 8.44 10.00 10.92 12.34 13.80 B.t.u. per. Lineal Ft. per Deg. Fahr. ; DLff. per Hr. 1 Lbs. Coal 120 L bs. 350 Deo. Fahr. Chapter XV--Heat Insulation for Pipes and Surfaces llllllllslIIP.IIP.PI I'j 0.779 0.943 1.14 1.42 1.58 1.94 2.32 ! 2.76 3.14 1 3.52 3.87 4.23 5.02 1 5.78 6.45 7.21 8.01 9.42 10.34 11.70 13.00 B.tiu. per Ltneal Ft. per Deg. Fahr. i Diff. per Hr. Lbs. Coal 80 L bs. .. 324 Deo. Fahr. . Dole. Loss npi <D ^ 1i Mo\ Lbs. Coal 1 B.t.u. per. Lineal i Ft. per : Deg. i Fahr. ! Diff. per Hr. "'"'-'''`''sdsdssSassgsKSB I|SSSS!8S!SKSS3SSSSKS- 2=22 S S8SgS83SS3:S2S333g82 Bt.u. per Lineal .Ft. per Deg. Fahr. Diff. per Hr. 1 | Dollars Loss v Lbs. Coal B.t.u. per Lineal Ft. per Deg. Fanr. . Diff. per Hr. i Lbs. Coal B.t.u. per Lineal Ft. per Deg. ` Fahr. Diff. per Hr. . Lbs. Coal B.t.u. per Lineal Ft. per Deg. Fahr. * Diff. per Hr. fc Si6 to a 0 M B t*. da Q 0 00 js s da Q 0o Pfht O1) ^Islllllllllllllllp 2n |||g,ss|gsHSi|||3|| rnmmmmmmmm ----SSSSSSSSSSSSSSSSSSSSS Klsssssgsgegsisssssss a SSk1S1||||I||k!||!|s gS3S3532SSSKSSS8SSSSR slSSsS3S82SSSSgSSS23 OOOOHnHHMN(iN<,X,)'#v)<0*oa 33S'SSS2SSSSSS22:S3 0' 0 0 O - " N NN) N) m o O I- 1! , ~i 249 120 Deo. Faqr. H ot Water