Two tests your gas engineer should always perform before commencing work on your gas installation

Share this article

If you have a gas appliance in your home or business, you may have heard of Let By and Tightness testing. These are two important tests that your gas engineer should always perform before commencing any work on your gas installation. But what are they and why are they so important?

Let By test is a test to check if the gas emergency control valve (ECV) is working properly. The emergency control valve (ECV) is a device that shuts off the gas supply to your installation when it is not in use. If the emergency control valve (ECV) is faulty, it may let some gas through even when it is closed. This can cause a gas leak and pose a serious risk of fire or explosion.

To perform a Let By test, the gas engineer will close the emergency control valve (ECV) and connect a pressure gauge to the installation. The pressure gauge will measure the pressure of any gas that may be leaking through the valve. The engineer will then open the valve slightly and observe the pressure gauge for one minute. If there is no perceptible movement (rise) of the gauge, it means that the emergency control valve (ECV) is working properly and no gas is leaking through. If there is any movement (rise) of the gauge, it means that the emergency control valve (ECV) is faulty and needs to be replaced. To replace the ECV you have to call the national gas supplier Cadent on 0800 111 999.

Tightness test is a test to check if there are any leaks in your gas installation. A leak can occur anywhere along the pipework, fittings or appliances that make up your installation. A leak can waste gas, increase your bills and expose you to carbon monoxide poisoning.

To perform a Tightness test, the gas engineer will close all the appliance valves and connect a pressure gauge to the installation. The engineer will then attach a gas testing gauge called a manometer, raise the pressure to 20mbar by letting gas into the test gauge via the ECV. The engineer will then wait for one minute to allow for pressure and temperature stabilisation. The engineer will then observe the pressure gauge for two minutes. If there is no perceptible movement (fall) of the gauge, it means that the installation is tight and no gas is leaking. If there is any movement (fall) of the gauge, it means that there is a leak somewhere in the installation and it needs to be located and repaired.

Let By and Tightness testing are essential for ensuring the safety and efficiency of your gas installation. They should always be performed by a qualified and registered gas engineer who has the right equipment and knowledge to carry out these tests correctly.

If you are looking for a reliable and professional gas engineer in your area, look no further than Roy Lee Plumbing & Heating Ltd. Roy is Gas Safe registered and has over 30 years of experience in providing high-quality gas services to our customers. Whether you need a new boiler installation, a boiler service or repair, or any other gas work, we can help you with our expertise and friendly service.

Don’t take any chances with your gas installation. Contact us today for a free quote and let us take care of your gas needs.

Share This Post

Related Posts

Open chat
1
Do you need any help?
Scan the code
Hello,
Do you have a question for Roy?