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open college, open polytechnic; otros ofertores nacionales de formación abierta 8.
open college , open polytechnic; other national publishers and providers of open learning 8.
Last Update: 2014-02-06
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except for nozzles located on the underside of a tank bottom that rests directly on the tank grade29 and nozzles with reinforcements that are too narrow to permit compliance with the following provisions, single-thickness reinforcing plates and saddle flanges or integral reinforcing pads on manholes or nozzles attached to the outside of a tank shall be provided with at least one telltale hole with a maximum actual diameter of 3/8 in. that shall be tapped for a preliminary compressed-air and solution-film test for soundness of attachment welds around the manhole or nozzle and its reinforcement both inside and outside the tank. these telltale holes shall be left open when the tank is in service. the surface of the reinforcing plate, saddle flange, or pad adjacent to the tank wall shall be relieved slightly by grinding to be reasonably certain that the test pressure will extend entirely around the nozzle even though the reinforcement may be drawn tightly against the tank wall by the welding.620
6except for nozzles located on the underside of a tank bottom that rests directly on the tank grade29 and nozzles with reinforcements that are too narrow to permit compliance with the following provisions, single-thickness reinforcing plates and saddle flanges or integral reinforcing pads on manholes or nozzles attached to the outside of a tank shall be provided with at least one telltale hole with a maximum actual diameter of 3/8 in. that shall be tapped for a preliminary compressed-air and solution-film test for soundness of attachment welds around the manhole or nozzle and its reinforcement both inside and outside the tank. these telltale holes shall be left open when the tank is in service. the surface of the reinforcing plate, saddle flange, or pad adjacent to the tank wall shall be relieved slightly by grinding to be reasonably certain that the test pressure will extend entirely around the nozzle even though the reinforcement may be drawn tightly against the tank wall by the welding.20
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