Foreword

The purpose of this Publication is to provide guidance on the specification of pressure vessels for circumstances not addressed in design codes. It has been prepared by the Pressure Vessels Committee (PRV) of EEMUA, the Engineering Equipment and Materials Users' Association. As such, this Publication brings together the practical lessons learnt about design, manufacturing and testing of pressure vessels by users in EEMUA member companies.

EEMUA 211 is composed of three Chapters:

1. Considerations on the Avoidance of Repeat Post-Weld Heat Treatment

Post-weld heat treatment (PWHT) may be of considerable importance to the structural integrity of a pressure vessel. This Chapter examines the circumstances under which repeat PWHT may be waived.

2. Design for Exceptional Internal Pressure

This Chapter describes methods for assessing both existing and new pressure vessels for exceptional internal pressures. Simple and advanced design methods are provided for two levels of service performance.

3. Minimum Nozzle Loadings and Nozzle Design

There are three sections to this Chapter which all relate to improvement in the specification and reliability of nozzles. In the first, tables of minimum design loadings are provided to ensure that nozzles, made in steel, nickel alloys or glass reinforced plastics, are suitable for certain minimum loadings. In the second, requirements on standout and minimum pipe schedule are given for nozzles made from pipe. In the third, particular designs of small bore nozzles are specified.