Gas Safe Register’s Technical Team are warning of the dangers of over-tightening test points on gas meters.
Gas metering refurbishment specialists have noted that significant numbers of predominantly domestic gas meters are being returned damaged, because the nut on the test point has been over-tightened.
The test point has a machined face seal that ensures a gas-tight seal, with two smooth metallic surfaces being drawn together by means of a mechanical thread. This gas-tight seal usually requires little more than a light turning force with a suitable tool, such as a suitably sized screwdriver or spanner, to ensure a gas-tight seal. It should always be tested with an approved leak detection fluid [LDF] after completing any work.
Over-tightening the screw in the test point is relatively difficult to achieve, but it can be done by using too much force and/or inappropriate tools. Over-tightening will commonly result in failure, either:
• The test point nut will shear off, or
• The test point shank will develop a longitudinal split.
Both these failures may result in an escape of gas. Where a gas escape has occurred, it should be repaired or, where it is not possible to repair the damage, the current Gas Industry Unsafe Situations Procedure (GIUSP) should be implemented and the appropriate actions and warning notices/labels completed and issued.
Photos 1 and 2 show the damage that can be caused by over-tightening the screw on the test point.
The Institution of Gas Engineers and Managers (IGEM) has taken over ownership of the Gas Industry Unsafe Situations Procedure (GIUSP). Previously, it was owned… Read Full Article
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
YouTube sets this cookie via embedded YouTube videos and registers anonymous statistical data.
1 year 1 month 4 days
Google Analytics sets this cookie to calculate visitor, session and campaign data and track site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognise unique visitors.
Google Analytics sets this cookie to store a unique user ID.
1 year 1 month 4 days
Google Analytics sets this cookie to store and count page views.
Google Analytics sets this cookie to store information on how visitors use a website while also creating an analytics report of the website's performance. Some of the collected data includes the number of visitors, their source, and the pages they visit anonymously.