TS 12420

TS 12420 is a standard for the organisation of competent services that work on pressure vessels and tanks, and for the minimum administrative and technical conditions they are expected to meet. Its focus is not the pressure equipment itself, but the service structure that provides maintenance, inspection-related support and associated service activities for such equipment.

What the standard covers in practice

The standard applies to pressure vessels and tanks of 300 litres and above, whether installed above ground or below ground, and used for liquid or gaseous LPG, CNG, oxygen, nitrogen, acetylene and similar gases. It also includes cryogenic applications. In general technical terms, competent-service arrangements are meant to keep service work aligned with the equipment’s operating risks, combining appropriate premises, tools and personnel qualification with a defined service organisation.

Main service areas addressed by the document

• Operating arrangements and service organisation
• Structural features and physical facilities
• Technical equipment and tooling
• Personnel characteristics and competence
• Certification principles

Pressure vessels and tanks are closed containers designed to store or transport gases under controlled conditions. Their service needs differ from ordinary mechanical maintenance because pressure, temperature and the physical state of the product can strongly affect safe handling. TS 12420 frames the competent-service model around those conditions, helping define the organisational and technical basis for work on this class of equipment.