A day in the life of a gas engineer......

A day in the life of a gas engineer......

Old Hamworthy

Dangerous stuffPosted by Sebastian Sun, February 19, 2012 13:40:57

Client sent me this in video format..... An old Hamworthy, burning in the primary air ports....... Not good! I advised it was shut down till I arrived.

On arrival, I found nothing wrong, flue flow fine, gas rate, burner pressure, slow start rate, ventilation, heat exchanger, all fine.........

Unfortunately, if I couldnt find the problem the boiler would have to be left off - burning in the primary ports produces huge amounts of CO................ so what to do?

Looking at it from first principals the speed of the gas flow through the burners would have to be below 36m/s to burn back into the primary ports. Even under slow start this wasnt happening......

I questioned the client, and he mentioned the timer 'chattered' as it fired the boiler.......

I set the timer to start in 5 minutes and waited...........

As the timer activated the boiler, it chattered...... pulsing the gas valve on/off....... and hey presto, the flames jumped back into the primary port........

Never seen that before!

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