TT8

Tanks on which the proper shipping name required for the entry UN 1005 AMMONIA,

ANHYDROUS is marked in accordance with 6.8.3.5.1 to 6.8.3.5.3 and constructed of finegrained

steel with a yield strength of more than 400 N/mm2 in accordance with the material

standard, shall be subjected at each periodic test according to 6.8.2.4.2, to magnetic particle

inspections to detect surface cracking.

For the lower part of each shell at least 20% of the length of each circumferential and

longitudinal weld shall, together with all nozzle welds and any repair or ground areas, be

inspected.

If the mark of the substance on the tank or tank plate is removed, a magnetic particle

inspection shall be carried out and these actions recorded in the inspection certificate attached

to the tank record.

Such magnetic particle inspections shall be carried out by a competent person qualified for

this method according to EN ISO 9712:2012 (Non-destructive testing – Qualification and

certification of NDT personnel – General principles).