BS 08562:2011 pdf download
BS 08562:2011 pdf download.Gas cylinders – In situ,non-destructive examination and testing of refillable seamless steel tubes of water capacity between 150 L and3000 L, used for compressed gases- Specification.
5 NDE personnel qualification
All personnel performing NDE work shall be certified in accordance with relevant standards (e.g. BS EN 473).
6 Marking
After satisfactory completion of the periodic inspection and test programme the shoulder of the tube, where accessible, shall be stamp-marked with the test details in accordance with the requirements of BS EN ISO 13769. The marking shall Include the date of the next retest (YYYY).
Under no circumstances shall the parallel section of the tube be hard-stamped.
Where the tube shoulder cannot be stamped, the nearest position to it where damage is unlikely to occur or the information unlikely to be rendered illegible shall be stamped, Where it is not possible to stamp the tube, other techniques shall be used to mark the information (e.g. installing a data plate or paint stencilling) or the information may be presented on another integral part of the installation, but as close as possible to the tube shoulder.
7 Certification/Report
For every tube examined a test certificateireport shal’ be issued and signed by the competent person giving the following information as a minimum:
a) the serial number(s) of the tube(s) examined;
b) a description of the installation (e.g. site details, tube installation and its/their position within the site);
c) the test date (day/month/year);
d) details of all tests pert ormed and their outcomes;
e) a listing of all standards and parameters used during the course of the testsi’examinations (e.g. pressures apphed, equipment used);
f) a listing of any deviations from the testlexamination protocols used;
g) a listing of any deviations that have been identified but not deemed sufficient for the tube to fail the test and
h) the date of next test (the elapsed period between tests may be shortened if any deviations are observed during the course of the test programme).
8 Rendering tubes unserviceable
NOTE The decision to reject a tube may be taken at any stage during the periodtc inspection and test procedure.
If it is not possible to recover a rejected tube, it shall, after notifying the owner, be made unserviceable for holding gas under pressure so that it is impossible for any part of the tube, especially the shoulder, to be re.issued Into service.
Al General
Defects can be physical, material or due to corrosion (e.g. as a result of environmental or service conditions to whkh the tube has been subjected during its life). This annex gives general guidelines regarding the application of rejection criteria.
Due to the nature of the examinations performed, it might not be always possible to see all the stamp markings.
Defects in the form of a sharp notch may be repaired using an approved method (e.g. grinding or machining). After any repair using a metal removal technique, the tube wall thickness should be checked (e.g. ultrasonically). The remaining wall thickness should be at least equal to the minimum guaranteed wall thickness.
A.2 Physical or material defects
The types of defect included in this category include but are not limited to:
a) dents;
b) cutocgouges
c) cracks;
d) fire damage;
e) arc or torch burns; and
f) suspicious marks.
Evaluation of physical or material defects should be in accordance with the requirements of ISO 6406:2005.
Attachments (e.g. foot-ringslsupports) should be inspected to ensure they are suitable for their intended purpose.
A.3 Corrosion
A.3.1 General
Tubes can be subjected to environmental conditions that could cause external corrosion and in-service conditions that could result in internal corrosion. There is difficulty In presenting definite rejection limits in tabular form for all sizes and types of tube and their service conditions. Rejection limits are usually established as a result of considerable field experience.
