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The Transportable Pressure Equipment Directive: Rho and Pi Marking

The Transportable Pressure Equipment Directive (TPED) 2010/35/EU is a directive agreed upon in the European Union that defines the rules and procedures for commissioning and certifying transportable pressure equipment on the road (in accordance with ADR), by rail (RID) and by inland waterways (ADN). The Regulations concerning the International Carriage of Dangerous Goods by Rail and the Agreement Concerning the International Carriage of Dangerous Goods by Road have also been followed by the UK for the same reasons. Although, in 2020, as a result of Brexit, the regulations maintained the same framework for dangerous goods regulations in Great Britain but made necessary amendments to reflect the UKs departure from the EU.

Before we move on to the amendments, it's necessary that we know what is the TPED Pi marking and it's importance. The TPE directive outlines the duties of several parties and mandates that TPE be conformity-assessed by an EU recognized authority and marked with a "Pi" conformity symbol before being placed on the market, as shown below:

In order to ease the process of transfer, the EU recognized authorities were appointed by Great Britain as competent bodies to continue the assessment. Although, the 2020 directive allowed for a Great Britain appointed authorized body to establish an alternative process of assessment to be marked with a 'Rho' conformity marking as shown below:

Pi-marked TPE placed on the EU or UK market by the end of the transition period (31 December 2020) can remain in use and be made further available on both markets. But, from 1 January 2023, TPE being placed on the GB market must be conformity assessed by a GB appointed body and Rho-marked, unless it is qualifying Northern Ireland TPE. Although, to clarify, TPE may be conformity assessed by a GB appointed body and an EU notified body, and bear two conformity marks (Rho and Pi). To be on the safer side, ensure that your pressure equipment for use in the Great Britain bear both Rho and Pi marked.

Enquire now with us for certified and approved valves and regulators for use across EU and Great Britain.