March 25, 2026. After an extensive review process, The Transport Project (TTP) released a comprehensive and updated Facility Modification Guidelines for Maintenance and Repair of Natural Gas Vehicles document. The publication is a product of TTP’s Technology & Development Committee and the Maintenance Facility Modifications Working Group. The original guide was compiled by Douglas Horne, P.E. of the former Clean Vehicle Education Foundation and last updated by the NGVAmerica Technology & Development Committee in May 2017.
The guide includes an overview of existing facility code requirements, modification recommendations, and advised personnel training for managers of maintenance repair garages. Considerations for both minor and major service areas deployed to maintain and repair compressed natural gas (CNG) and liquefied natural gas (LNG) fueled vehicles are provided in the guide.
“This document should become a must-use reference guide for any vehicle fleet deploying natural gas trucks and buses,” said Marty Tufte, TTP Chair and Corporate Fleet Director for WM. “Compiled by subject matter experts across multiple TTP member companies, this guide is provided to all CNG and LNG vehicle operators free of charge to enhance safety across the industry, ensure compliance with relevant standards, and promote best practices for the greatest operational success for NGV fleets of all sizes.”
Topics covered by the guide include ventilation, gas detection, sources of ignition, electrical classification, vehicle preparation for maintenance, and the maintenance and decommissioning of vehicle fuel containers. Members of the document task force include Chris Culberson of Cummins Clean Fuel Technologies, Jim Leonard of J.R. Leonard Construction Company, Leo Thomason of Alternative Fuel Vehicle Institute (AFVi), John Tiquet of WM, and Paul Sandsted, TTP’s Director of Technology and Sustainability.