(2) The design provider temperature may be the coldest temperature for which a cylinder is suited. The demanded structure services temperatures for every cryogenic liquid is as follows:
(d) No person may well mark or normally certify a packaging or container as meeting the requirements of a manufacturing Particular permit Unless of course that person may be the holder of or a celebration to that Particular permit, an agent in the holder or bash for the goal of marking or certification, or a 3rd party tester.
(three) A plugged cylinder is one particular where a long lasting closure in the bottom of the completed cylinder has become effected by a plug.
Reheat therapy is approved for just a rejected cylinder in accordance using this type of paragraph (m). Following reheat, a cylinder will have to pass all prescribed tests In this particular section to get suitable. Fix of brazed seams by brazing and welded seams by welding is taken into account authorized.
(i) The word “spun” or “plug” must be put close to the DOT specification marking when an end closure in the finished cylinder has become welded by the spinning procedure, or effected by plugging.
Material have to be identified by any ideal system except that plates and billets for hotdrawn cylinders has to be marked with the heat range.
(2) Every single opening in the spherical variety cylinder must be provided which has a fitting, boss, or pad of weldable metal securely attached towards the container by fusion welding.
(three) A plugged cylinder is just one in which a lasting closure in The underside of a finished cylinder continues to be effected by a plug.
S = PD / 4tE Where by: S = wall tension in psi; P = examination force prescribed for h2o jacket exam, i.e., no less than two periods company tension, in psig; D = outside the house diameter in inches; t = minimum wall thickness in inches; E = 0.
All spun cylinders and plugged cylinders has to be tested for leakage by fuel or air strain after the bottom continues to be click here cleaned and is absolutely free from all dampness subject matter to the next conditions and limits:
(vii) The effects Houses of each set of effect specimens will not be lower than the values in the subsequent table:
Notwithstanding the variation delivered During this paragraph, Just about every container must otherwise conform to some DOT 2Q container in accordance with § 178.33a. The following circumstances also use below Variation one—
Each and every cylinder should be uniformly and properly warmth treated ahead of tests. Any suitable heat procedure in excessive of 1100 °F is approved other than that liquid quenching is just not permitted. Heat cure needs to be completed In the end forming and welding operations.
(iii) When dimension of cylinder does not allow securing straight specimens, the specimens could be taken in any location or route and will be straightened or flattened cold, by pressure only, not by blows.