There is a time during new construction when natural gas is brought onsite. Here are a few guidelines to go by in order to keep everyone safe and comfortable with working gas onsite.
There are a lot of things that can cause the smell of gas in your work areas.
Leaks: Leaks will occur throughout the job. Every day the safety department tests all fuel gas flanges, and connections in your work area that may leak. These lines are pressurized sometimes all of the day, sometimes none of the day, and sometimes part of the day. So as pressurization occurs there may be a leak that wasn’t noticed at the beginning of the day. So it’s always a good idea to go ahead and test the area if you smell gas, even if a permit has already been written.
PSV Valve: The PSV Valve is a funny device. Not only will it vent natural gas on command, it will vent if the turbine trips. This means that it will vent mostly intentionally, but sometimes unexpectedly. When the PSV Valve vents, it will whistle loudly, so if you are in the area, it is unlikely that you will not know it has vented. Start-up will notify all subcontractors when an expected vent is about to occur. If, however, it vents on its own you need to call the safety officer and get the area checked out before continuing hot work.
Miscellaneous: You cannot anticipate every single way that gas can be present on a job. So if you are working and you smell gas, get it checked out.