(ii) Taper threads for being of size not under as specified for American Standard taper pipe threads.
Cylinders needs to be manufactured utilizing equipment and procedures adequate to make certain Every cylinder generated conforms to the necessities of the subpart. No defect is permitted that is probably going to weaken the concluded cylinder appreciably. A fairly sleek and uniform surface area complete is necessary. Heads could possibly be attached to shells by lap brazing or might be shaped integrally.
A DOT 39 cylinder can be a seamless, welded, or brazed cylinder with a company pressure not to exceed eighty p.c from the take a look at pressure. Spherical stress vessels are authorized and coated by references to cylinders Within this specification.
Just after pressure testing, a flattening check should be performed on one cylinder taken at random out of each and every wide range of 200 or less by positioning the cylinder among wedge-formed knife edges aquiring a 60 degree incorporated angle, rounded to some fifty percent-inch radius.
(i) If the selected cylinder passes the water-jacket or immediate enlargement exam, the remaining cylinders in Every good deal must be force analyzed because of the evidence strain h2o-jacket or direct enlargement test approach as prescribed in CGA C-1.
(i) The remaining cylinders in each lot should be analyzed with the proof tension water-jacket or immediate growth take a look at approach as prescribed in CGA C-1. The least examination stress need to be maintained for the specific timeframe plus the testing click here products need to be calibrated as prescribed in CGA C-one.
(iv) Long-lasting volumetric expansion may well not exceed 10 p.c of the full volumetric enlargement at check tension.
All spun cylinders and plugged cylinders has to be analyzed for leakage by gasoline or air pressure soon after the bottom has actually been cleaned and is also free from all humidity, matter to the following situations:
Ends: The highest of the container have to be created that has a strain aid system consisting of radial scores on the best seam(s). The underside in the container need to be built to buckle at a strain higher as opposed to stress at which the very best buckles and vents.
In combination with the data expected by § 178.35, the record of chemical analyses have to also include the alloy designation, and applicable information on iron, titanium, zinc, magnesium and almost every other relevant element used in the development of your cylinder.
One list of a few impact examination specimens (for each check) has to be geared up and analyzed for determining the influence properties on the deposited weld metal—
S = Mc/I (iii) To compute the utmost longitudinal tensile stress as a result of hydrostatic test stress, the following components must be employed:
(two) Metallic attachments to cylinders must have rounded or chamfered corners or need to be safeguarded in this type of fashion as to avoid the probability of creating puncture or damage to other harmful elements deals.
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