Flush type watertight hatch or manholedoi:US3084827 ADyer, Harry B.USUS3084827 * Mar 20, 1961 Apr 9, 1963 Nashville Bridge Company Flush type watertight hatch or manholeUS3084827 * 1961年3月20日 1963年4月9日 Nashville Bridge Company Flush type watertight hatch or manhole...
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manhole accessway located in a tank structure 3 1 2 semi fl ush refers to the placement of the hinged plate over the ringed opening without coaming 4 Classifi cation 4 1 Type I 15 by 23 in 381 by 584 mm size of access opening 4 2 Type II 18 by 24 in 457 by 610 mm size of ...
1、Designation: F1142 98 (Reapproved 2012) An American National StandardStandard Specification forManhole Cover Assembly, Bolted, Semi-Flush, Oiltight andWatertight1This standard is issued under the fixed designation F1142; the number immediately following the designation indicates the year oforiginal ...
Flush type watertight hatch or manholeDYER HARRY B.
A temporary manhole may be placed over the top of the shaft during the setting up and installation of the permanent manhole cover. The edge of the normal type of manhole cover may rest on a ring or frame (13) resting on a narrow top ring (44) of the shaft (24). There is a U-...
A temporary manhole may be placed over the top of the shaft during the setting up and installation of the permanent manhole cover. The edge of the normal type of manhole cover may rest on a ring or frame (13) resting on a narrow top ring (44) of the shaft (24). There is a U-...
1、Designation: F1142 98 (Reapproved 2012) An American National StandardStandard Specification forManhole Cover Assembly, Bolted, Semi-Flush, Oiltight andWatertight1This standard is issued under the fixed designation F1142; the number immediately following the designation indicates the year oforiginal ...