. Principles and practice of plumbing . st extend through the bottom orside of tank. In the latter case it must project beyond thebalcony. Frost-Pkooping forPipes. — The dischargeand hot water or steampipes, and separate fillingpipe when one is needed,for a tank on a tower onthe ground or roof of abuilding, must be pro-tected from freezing by afrost-proof covering inaddition to having thewater in the dischargepipe heated. The frost-proof cov-ering should not be de-pended upon to preventfreezing of the pipeswithout some heat being added. Most tanks for fire pro-tective purposes have no draft fr
. Principles and practice of plumbing . st extend through the bottom orside of tank. In the latter case it must project beyond thebalcony. Frost-Pkooping forPipes. — The dischargeand hot water or steampipes, and separate fillingpipe when one is needed,for a tank on a tower onthe ground or roof of abuilding, must be pro-tected from freezing by afrost-proof covering inaddition to having thewater in the dischargepipe heated. The frost-proof cov-ering should not be de-pended upon to preventfreezing of the pipeswithout some heat being added. Most tanks for fire pro-tective purposes have no draft from them except in case offire, therefore the water in the discharge pipes has little orno circulation. For this reason, these pipes need more thor-ough protection than do pipes in similar positions whichdischarge from tanks in which there is nearly constant cir-culation, as for example in a village supply. Therefore theamount of protection to be provided for a certain pipe mustbe decided with due regard to the severity of exposure to. 11 nil ii 1 i mg. 148 Expansion Joint for Wooden Tanks Digitized by Microsoft® 328 Principles and Practice of Plumbing cold winter winds, frequency of circulation in the pipe andamount of heat to be supplied. The standard frost-proof boxings are made of woodand are circular as shown in Fig. 149, or square in sectionas shown in Fig. 150. The boxings may be made more durable by using stockwhich has been antiseptically treated. A good tight joint must be made between boxing andbottom of tank. The lower end of boxing must be sup-ported by the sides of the pit, which must extend about afoot above ground. The woodwork must be well painted. Sheet lead or tarred paper should be placed between bot-tom of boxing and the pit to avoid absorption of moisture. The upper part ofboxing must be con-structed so as to permit ofaccess to the expansionjoint without the neces-sity of destroying anyportion of the boxing. The boxing must bemade four-ply, with twoair s
Size: 1639px × 1524px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidcu3192402142, bookyear1922
