(a) Just about every packaging represented as made to some DOT specification or simply a UN common must be marked over a non-removable component on the packaging with specification markings conforming towards the relevant specification, and with the following:

(three) The letters “USA” has to be applied to point the State authorizing the allocation of the specification marks if the packaging is produced in the United States.

(iii) Straight threads, possessing at the very least four engaged threads, to obtain limited in shape and calculated shear strength not less than ten situations the test strain with the cylinder; gaskets required, sufficient to prevent leakage.

Welding or brazing for just about any purpose in any respect is prohibited, except that welding by spinning is permitted to shut the bottom of spun cylinders. Machining or grinding to make appropriate area end at point of closure is needed.

(1) Specimens need to be taken from a single cylinder just after warmth cure as illustrated in appendix A to this subpart, picked at random from Each and every lots of two hundred or fewer, as follows:

(iii) The bare minimum test force must be preserved at least thirty seconds and adequately lengthier to be sure entire growth. Any inside tension applied right after warmth-procedure and prior to the Formal take a look at may well not exceed 90 % on the take a look at pressure.

Just one container taken at random outside of two hundred or fewer need to be hydrostatically analyzed to destruction. The rupture tension must be integrated as Portion of the inspector's report.

(2) All features performed by, or on behalf of, the person whose title or image appears as Section of the marking conform to needs laid out in this aspect.

(iii) For the purpose of pressure measurement, the First pressure have to be established though the specimen is underneath a tension of 12,000 psi, and also the pressure indicator reading need to be established with the calculated corresponding pressure.

(one) Welding or brazing is licensed for your attachment of neckrings and footrings which might be non-tension components and only for the tops and bottoms of cylinders using a company pressure of 500 psig or significantly less.

Cylinders have to be created employing products and processes suitable in order that Each individual cylinder made conforms to the requirements of the subpart. No fissure or other defects is permitted that get more info is probably going to weaken the concluded cylinder appreciably. A reasonably smooth and uniform area complete is required. Otherwise initially absolutely free from these types of defects, the surface area could possibly be machined or otherwise handled to do away with these defects.

Reheat therapy is authorized for rejected cylinders. Subsequent thereto, cylinders have to move all prescribed assessments to be appropriate. Repair service by welding or spinning will not be approved.

(iv) Long lasting volumetric enlargement may not exceed 10 per cent of the overall volumetric expansion at examination tension.

(ii) The porous filling materials should be uniform in high quality and free of voids, other than that a well drilled in the filling product beneath the valve is approved In the event the well is stuffed with a material of these types of sort that the functions with the filling materials are not impaired;