Addenda to the 2003 GPTC Z230 Guide for Gas Transmission and Distribution Piping Systems are available for free download. These addenda are organized to allow direct page substitution into your copy of the base 2003 edition publication. Addendum No. 12 is the last addenda to the 2003 Guide.
2003 Edition Formal Interpretation:
The Committee has issued a formal interpretation on the design factor for pipelines and mains installed in inland navigable waters. Download a copy below.
2003 Edition Errata:
The Secretary has issued one errata applicatible to early verisons of the 2003 Edition. Later printings of the 2003 Edition are corrected.