. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 32.—Relief stand for preventing excess pressure on concrete pipe. sure at every tree row. It is not possible to pile up pressures that will exceed the height of the hydrants in this case, irrespective of the grade of the feed pipe. There are three general types of overflow hydrants used and each type may have several modification?. Fig. 33.—Relief of pressure accomplished by short stands with pressure gates. The most common type consists of two lengths of concrete pipe (fig. 8) set vertically and adjacent to each other
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 32.—Relief stand for preventing excess pressure on concrete pipe. sure at every tree row. It is not possible to pile up pressures that will exceed the height of the hydrants in this case, irrespective of the grade of the feed pipe. There are three general types of overflow hydrants used and each type may have several modification?. Fig. 33.—Relief of pressure accomplished by short stands with pressure gates. The most common type consists of two lengths of concrete pipe (fig. 8) set vertically and adjacent to each other. The stand con- nected to the inlet pipe acts as the distributing hydrant and is fitted. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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