Commercial Contractor Handbook

Reference materials for contractors containing piping tables, regulator sizing charts and company policies.

We have made every effort to assure that all information is current and up to date at time of the printing. Codes in Washington and Oregon are based on the 2003 International Mechanical Code (IMC). All information in the booklet reflects code language from the 2003 IMC, until reprinted.

This booklet is designed to be used as a quick reference and not to replace current code language. Please refer to “Oregon Mechanical Specialty Code”, if in Washington, the International Mechanical Code, or the International Fuel Gas Code for more detailed information.

For any questions on NW Naturals policies please contact the Portland Resource Center at 503-220-2360.