1 2 Loss of Heat from Covered Steam Pipes 



given are averages of several tests in most cases. The tests were 

 made in 1901. 



The values of C were for the most part worked up from the 

 separate tests and averaged. 



The "Remanit" coverings are of German origin. They 

 were encased in canvas. 



In the case of the "Hair Felt," a layer of asbestos paper -% 

 of an inch thick was first bound around the pipe, over this was 

 bound the hair felt, then a layer of paper, and outside of all a 

 canvas covering. 



BRILL'S TESTS. 



These tests were published in Vol. XVI. of the Transactions of 

 the American Society of Mechanical Engineers. 



The steam pressure was 1 10 to 117 pounds. 



The test pipe was a standard 8-inch steam pipe about 60 feet 

 long. 



The tests were about four hours long and the figures given 

 here are in each case the average of three tests. 



The tests were made in 1894 or J 895. 



B. T U. Corn- 

 Temp, of Temp, of per sq. ft. puted 



Thickness Steam Steam, Air, of Pipe Value 

 Name of of Pressure, Degs. Degs. Surface of 



Covering. Covering. I,bs. Fahr. Fahr. per hour. C. 



Magnesia i.25 x/ no 344.1 66.3 106.6 .527 



Rock Wool i. 60" no 344.1 63.0 72.1 .395 



Mineral Wool I-30" no 344.1 58.3 81.3 .381 



Champion Mineral Wool.. 1.44" 113.3 34 6 - 1 74-3 86.1 .470 



Asbestos Fire Felt 1.30" in 344.7 79 133.5 .755 



Manville Sectional 1.70" 112.3 345.5 78.3 93.4 .600 



Hair Felt 82" 117 348.3 69 117.9 -39 6 



Riley Cement 75" 116.3 347-9 74-3 260.8 1.200 



Fossil Meal 75" "5 347-1 75-3 2 3 8 - 8 1-050 



The ' ' Riley Cement ' ' and ' ' Fossil Meal ' ' were mixed with 

 water and plastered on the pipe. 



The ' ' Hair Felt ' ' was bound very tightly around the pipe 

 and had no canvas covering. It had a layer of asbestos paper 

 under it. Its tightness would increase its conductivity, and fur- 

 thermore it had no canvas covering, which throws a doubt as to 

 what value to asign to K for the radiation. This would be suf- 

 ficient to explain the increased value of C over that found in Prof. 



