The 2015 National Fuel Gas Code is currently under revision which will lead to the 2018 Edition to be published in the Fall of 2017. Please check back periodically for public review notices and draft documents. Also review the NFPA 54 web pages for updates.
For further information contact Paul Cabot, Secretary, at firstname.lastname@example.org or 202.824.7312.
When calculating savings in energy cost from using natural gas appliances and considering conservation and efficiency efforts, some analysts simply multiply the average cost per unit of energy times the energy savings. This method of determination is inappropriate because only a part of the natural gas energy cost should be considered in this calculation. The marginal costs should be considered when calculating the impact of conservation efforts, which tend to happen, at the margin of user consumption.