Identifying immediate danger on a cooker and safely disconnecting | Gas tutorial

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How to correctly identify incomplete combustion.

As a qualified Gas/Dual fuel engineer or an engineer in training, identifying incomplete combustion forms an important part of your role. It is vital you know how to correctly identify the signs, understand why it is happening and the next steps you should take to ensure the problem is safely resolved.

The signs of incomplete combustion on a cooker.

When checking appliances it is essential to check the flame on each ring and the oven (if applicable). A flame which is operating properly will have a nice 'crisp' blue flame with zero signs on impingement from the heat exchanger. If the flame has a 'floppy yellow' appearance (yes that is the technical term) then this could be a sign of incomplete combustion. By removing the cap and cleaning the ring, sometimes the problem can be resolved. However if the problem persists then this means the cooker has incomplete combustion and is classified as 'immediately dangerous'. Incomplete combustion on a cooker is going to cause a build up of fumes and potential threat to life. It is therefore important you follow the proper protocol. 

What to do when you find and immediately dangerous situation on a cooker

When you have identified the cooker as being immediately dangerous, the appliance or the meter needs to be isolated from the installation. Before and after carrying out this work, it is important to carry out  a tightness test to identify any gas leaks. Once this has been carried out you can proceed with capping of the appliance/meter. The following equipment is required to carry out this procedure.

- Gas paste (jointing compound)
- BSP Plug
- Leak Detection Fluid
- Grips
- Wrench/Spanner

After moving the appliance away from the wall to gain access, remove the hose by pushing and twisting the bayonet fittings anti-clockwise.

To remove the bayonet, use the grips to hold the fitting in place and then use your spanner to turn and remove. Next take the BSP plug and cover the thread in jointing compound and screw the plug into the empty fitting. Ensure the fitting is tight using your grips and spanner and wipe away and excess gas paste.

It is important to now carry out a second tightness test and it is also good practice to brush the fitting with leak detection fluid. Any leaks will show up as large bubbles. Finally, apply an industry standard 'do not use' sticker to the appliance and fill out a 'warning notice'. 

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*Disclaimer* - This work should only be carried out by a qualified gas engineer or someone being supervised as part of their training.