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EEMUA Publication 240 image

2019, Edition 1

ISBN: 978 0 85931 229 5

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EEMUA Publication 240 - Factors to consider when managing High Temperature Hydrogen Attack on petroleum and chemical facilities

Version: Print

If you are a user from an EEMUA member company, please log in and download your complimentary digital edition here.

A digital/PDF version is also available.

EEMUA Publication 240 provides guidance on the key elements of managing High Temperature Hydrogen Attack (HTHA) and provides a checklist of issues that have been identified within EEMUA member companies. It aims to supplement company policies and procedures, and assist facility personnel to manage equipment exposed to HTHA. This publication focuses primarily on equipment constructed from carbon steel though aspects of the contents are generally relevant to equipment constructed from other materials. EEMUA 240 is intended to advance the discussion with regulators, such as the British Health and Safety Executive, as to what consitutes good practice in this key area.

EEMUA has set up a HTHA Forum for member companies and is holding a HTHA Seminar near Manchester, UK on 20 June 2019. Please contact EEMUA for further details.

Member price: £116.00

Non-member price: £155.00

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EEMUA Publication 235 image

2019, Edition 1

ISBN: 978 0 85931 219 6

EEMUA Publication 235 - Guidance on PWHT for P1 CMn steels

Version: Print

If you are a user from an EEMUA member company, please log in and download your complimentary digital edition here.

A digital/PDF version is also available.

The removal of mandatory Post Weld Heat Treatment (PWHT) for P1 group CMn steels thicker than 0.75 inch in the 2014 edition of ASME B31.3 (and later editions) prompted EEMUA member companies to develop this publication. If PWHT is performed incorrectly, or neglected altogether, residual stresses can combine with load stresses to exceed a material’s design limitations. This can lead to weld failures, higher cracking potential and increased susceptibility to brittle fracture.

EEMUA 235 provides guidance to designers of piping systems on the threshold thickness for PWHT of P1 steels. It also advises on the benefit of PWHT for P1 steels when selected for low temperature applications, such as in the offshore oil and gas sector. EEMUA commissioned fracture mechanics specialists to create a new set of design curves for P1 steels based on ASME B31.3 and API 579 which are included in the publication.

Member price: £145.00

Non-member price: £193.00

EEMUA Publication 184 image

2019, Edition 3

ISBN: 978 0 85931 170 8

EEMUA Publication 184 - Guide to the isolation of pressure relieving devices

Version: Print

If you are a user from an EEMUA member company, please log in and download your complimentary digital edition here.

A digital/PDF version is also available.

In order to permit their removal and replacement without plant shutdown, pressure relieving devices may need to be isolated from the equipment they protect. However, the installation of isolating valves around protective devices is potentially hazardous as it introduces the risk of a system being left unprotected against over-pressure due to the relief path being inadvertently closed off. Existing standards offer little or no detailed guidance in this area.

EEMUA 184 plugs the gap by expanding on the guidance given in API RP 520 Part II and incorporating EEMUA Information Sheet 50 - The Importance of isolation management around relief systems. It outlines the case for using relief valves as a layer of protection, gives advice on managing safe isolation and stresses the importance of safe de-isolation after completion of relief system work. EEMUA 184 provides several examples in loss prevention history where the failure to adequately manage relief system isolations has been a major factor in causing process safety incidents.

It is essential to conform to local statutory legislation or regulations in relation to the use, and isolation of, relief devices. In some countries, conformance to certain standards and codes may be a mandatory requirement and specific standards, such as those pertaining to boilers, may specifically prohibit the installation of isolation devices.

Member price: £110.00

Non-member price: £140.00

EEMUA Publication 240 image

2019, Edition 1

ISBN: 978 0 85931 229 5

EEMUA Publication 240 - Factors to consider when managing High Temperature Hydrogen Attack on petroleum and chemical facilities

Version: Print

If you are a user from an EEMUA member company, please log in and download your complimentary digital edition here.

A digital/PDF version is also available.

EEMUA Publication 240 provides guidance on the key elements of managing High Temperature Hydrogen Attack (HTHA) and provides a checklist of issues that have been identified within EEMUA member companies. It aims to supplement company policies and procedures, and assist facility personnel to manage equipment exposed to HTHA. This publication focuses primarily on equipment constructed from carbon steel though aspects of the contents are generally relevant to equipment constructed from other materials. EEMUA 240 is intended to advance the discussion with regulators, such as the British Health and Safety Executive, as to what consitutes good practice in this key area.

EEMUA has set up a HTHA Forum for member companies and is holding a HTHA Seminar near Manchester, UK on 20 June 2019. Please contact EEMUA for further details.

Member price: £116.00

Non-member price: £155.00

EEMUA Industry Information Sheet 3 - Barrier Glands image

2019, Edition 1

ISBN:Not applicable

EEMUA Industry Information Sheet 2 – Guidance to practitioners on use of cable glands in explosive atmospheres

Version: Digital/PDF

If you are a user from an EEMUA member company, please log in and download your complimentary digital edition from our knowledge centre


Changes introduced in the 2014 edition of IEC 60079-14 included the removal of the enclosure volume criterion to determine whether to use a barrier gland and its replacement by a criterion based on cable length. No evidence was presented to support this change. The enclosure volume criterion had been adopted as a result of work done by ERA for EEMUA in 1976. Follow-up work done by Intertek for EEMUA since the publication of IEC 60079-14:2014 has confirmed that the ERA work was correct. This information sheet provides more of the background to this work and the recommended actions  

Non-member price: £0.00