Fixed tanks (tank-vehicles), demountable tanks and battery-vehicles:
For fixed tanks (tank-vehicles) and demountable tanks used exclusively for the carriage of LPG, with carbon steel shells and service equipment, the hydraulic pressure test, may, at the time of the periodic inspection and at the request of the applicant, be replaced by the non-destructive testing (NDT) techniques listed below. These techniques may be used either singularly or in combination as deemed suitable by the competent authority or the inspection body (see special provision TT9):
- EN ISO 17640:2018 - Nondestructive testing of welds - Ultrasonic testing - Techniques, testing levels and assessment,
- EN ISO 17638:2016 - Non-destructive testing of welds - Magnetic particle testing, with acceptance of indications in accordance with level 2X of EN ISO 23278:2015 - Non-destructive testing of welds - Magnetic particle testing. Acceptance levels;
- EN ISO 17643:2015 - Nondestructive testing of welds - Eddy current examination of welds by complex plane
analysis,
- EN ISO 16809:2019 - Nondestructive testing - Ultrasonic thickness measurement, 

Non-destructive checks shall be performed by personnel in accordance with EN 12972:2018 + A1:2024 or EN 14334:2014.

After direct application of heat such as welding or cutting to the pressure containing elements of the tank a hydraulic test shall be carried out in addition to any prescribed NDT. 

NDT shall be performed on the areas of the shell and equipment listed in the table below:

+----------------------------------+-------------------------------+
| Area of shell and equipment      | NDT                           |
+----------------------------------+-------------------------------+
| Shell longitudinal butt welds	   |                               |
+----------------------------------+                               |
| Shell circumferential butt welds |                               |
+----------------------------------+                               |
| Attachments, manway, nozzles     |                               |
| and opening welds (internal)     | 100% NDT, using one or more   |
| direct to the  shell 	           | of the following techniques:  |
+----------------------------------+ ultrasonic, magnetic particle |
| High stress areas of fastening   | or eddy current testing       |
| doubling plates (over the end    |                               |
| of the saddle horn, plus 400 mm  |                               |
| down each side)                  |                               |
+----------------------------------+                               |
| Piping and other equipment welds |                               |
+----------------------------------+-------------------------------+
| Shell, areas that cannot be      | Ultrasonic thickness survey,  |
| visually inspected from the      | from inside, on a 150 mm      |
| outside                          | (maximum) spaced grid         |
+----------------------------------+-------------------------------+

Irrespective of the original design and construction standard or technical code used for the tank, the defect acceptance levels shall be in accordance with the requirements of the relevant parts of EN 14025:2023 (Tanks for the transport of dangerous goods - metallic pressure tanks - design and construction), EN 12493:2020 (LPG equipment and accessories - welded steel pressure vessels for LPG road tankers - design and construction), EN ISO 23278:2015 (Nondestructive testing of welds - magnetic particle testing of welds - acceptance levels) or the acceptance standard referenced in the applicable NDT standard.

If an unacceptable defect is found in the tank by NDT methods it shall be repaired and retested. It is not permitted to hydraulic test the tank without undertaking the required repairs.

The results of the NDT shall be recorded and retained for the lifetime of the tank.

Tank-containers, tank swap bodies and MEGCs:
(Reserved)