ISO 16812:2019

INTERNATIONAL ISO
STANDARD 16812
Third edition
2019-02
Petroleum, petrochemical and natural
gas industries — Shell-and-tube heat
exchangers
Industries du pétrole, de la pétrochimie et du gaz naturel —
Échangeurs de chaleur à faisceaux
Reference number
©
ISO 2019
© ISO 2019
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Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Supplements to API Std 660, 9th edition (2015). 2
4.1 General requirements . 2
4.2 Service designation . 2
4.3 Requirements for carbon steel in sour or wet hydrogen sulfide service . 2
4.4 Weld procedure qualification . 2
4.5 Sour or wet hydrogen sulfide service . 2
4.5.1 Subclause A.2.2.1 . 2
4.5.2 Subclauses A.2.2.2 and A.2.2.3 . 2
4.6 Tube failure in high-pressure units . 2
Bibliography . 3
Foreword
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore
structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 6, Processing
equipment and systems.
This third edition cancels and replaces the second edition (ISO 16812:2007), which has been technically
revised.
This document supplements API Std 660, 9th edition (2015).
The technical requirements of this document and API Std 660 used to be identical. In the meantime API
Std 660 has been technically revised as API Std 660, 9th edition (2015). The purpose of this document
is to bring it up to date, by referencing the current edition of API Std 660 and adding supplementary
content.
The main changes compared to the previous edition are as follows:
— Improved guidance on cyclic service and sour service;
— The minimum bend for ‘U’ tubes when using stainless steel, duplex, etc., increased;
— Minimum requirements added w
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