KST – KROMSCHRÖDER SYSTEM TECHNOLOGY
5.2.6.4 Automatic burner control systems for burners operating in the open air
Each burner firing in the open air with a rated heat input greater than 70 kW shall be fitted with an automatic burner control system complying, if technically applicable, with EN 298 or EN 125.
Where the burner heat input rating is 70 kW or less, the flame may be supervised by the operator, provided that the flame is visible from his workplace.
If the flame cannot be observed continuously from the workplace, an automatic burner control system complying, if technically applicable, with EN 298 or EN 125 shall be provided.
Where an installation is equipped with several burners other than ON/OFF burners, no automatic burner control system is required if the burners are arranged in a configuration in which the flame of an operating burner will reliably crosslight another burner in the event of flame extinction.1) However, in this case at least one burner shall be equipped with spark restoration or a supervised permanent pilot designed so that a failure of the permanent pilot or the spark restoration system leads to safety shut-down of all the burners.
If required for, and allowed by, production operations, the flame supervision function shall be integrated into a control other than a standard automatic burner control system, if such a control is capable of triggering an automatic shut-down. Any such device shall be designed to generate an alarm in the event of a safety shutdown. The required measures after a flash-back shall be described in the instruction for use.
If necessary for process reasons (e.g. load damaged due to lock-out (see 3.48)), and where the single burner capacity is below 100 kW, the lock-out function integrated into a multiple burner installation may be replaced by an acoustic and a visual alarm providing the operator can react in a time to be specified in instruction for use.
The following chapters are printed with the permission of the DIN Deutsches Institut für Normung e.V. (German Institute for Standardization). For the implementation of the DIN Standard, the version with the most recent issue date is deemed authoritative. This is available from Beuth Verlag GmbH, Burggrafenstrasse 6, 10787 Berlin, Germany.
Our note on this Standard:
1) From our point of view, this procedure should be used only in the case of long burners or surface burners and only if the burners are supervised on the burner end opposite to the ignition source (see also 5.2.5.3.4.3.).
For all other applications, we recommend separate supervision of each individual burner.
