The attachment for the tops and bottoms only of cylinders by welding of neckrings, footrings, handles, bosses, pads and valve security rings is authorized offered that these types of attachments and also the part of the container to which They are really connected are created of weldable steel, the carbon material of which can not exceed 0.25 %.

(1) Until usually stated, if a sample cylinder or specimen taken from a great deal of cylinders fails the prescribed take a look at, then two additional specimens should be selected from your exact same good deal and subjected on the prescribed take a look at. If either of those fails the exam, then the whole ton must be turned down.

(3) A plugged cylinder is one particular by which a permanent closure in The underside of a finished cylinder has become effected by a plug.

(two) Thickness of your cylinder base might not be fewer than the prescribed minimum wall thickness of your cylindrical shell. The cylinder foundation should have a standard torispherical, hemispherical, or ellipsoidal inside foundation configuration where the dish radius is no larger than one.

Marking have to be performed by stamping in the metal of the cylinder. All markings has to be legible and Found on the shoulder.

(ii) The serial number have to be placed just below or promptly following the DOT specification marking.

(two) Validate compliance of cylinder shells with all shell requirements; inspect inside prior to closing in both equally finishes; validate heat procedure as appropriate; attain all samples for all checks and for Examine analyses; witness all checks; verify threads by gauge; report volumetric ability and minimal thickness of wall famous.

(one) Pressurization has to be executed hydrostatically among approximately zero psig as well as provider pressure at a level not in extra of ten cycles per moment. Satisfactory recording instrumentation needs to be offered if machines is always to be remaining unattended for periods of time.

(iv) Long-lasting volumetric enlargement may not exceed ten p.c of the total volumetric enlargement at test pressure.

Reheat procedure is authorized for rejected cylinders. On the other hand, Each and every reheat taken care of cylinder will have to subsequently move many of the prescribed exams. Mend by welding is not really licensed.

All spun cylinders and plugged cylinders needs to be analyzed for leakage by fuel or air force soon after the bottom continues to be cleaned and it is free from all humidity subject matter to the next situations and limitations:

Chemical analyses and tests demanded by this subchapter need to be manufactured inside the United States, Until normally authorized in writing because of the Associate Administrator, in accordance with subpart I of component 107 of the chapter. get more info Inspections and verification needs to be done by—

(i) The porous substance may well not disintegrate or sag when wet with solvent or when subjected to regular provider;

(ii) To the “extension under load” system, the entire pressure (or extension below load) similar to the anxiety at which the 0.two percent long-lasting pressure occurs could be decided with ample accuracy by calculating the elastic extension in the gage length under appropriate load and introducing thereto 0.