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ISO 22968-2010 pdf free download
ISO 22968-2010 pdf free download.Forced draught oil burners Braleurs a air souffle pour combustibles liquides.
A safety shut-off device shall be provided between the pump and nozzle as shown in Figures Fl to F.4. It is permissible that the safety shut-off device be integrated with the oil-pump.
In addition, the following applies.
a) Single-stage burners shall be provided with one safety shut-off device in accordance with ISO 23553-1.
b) Two-stage or multi-stage burners shall be fitted with one safety shut-off device for each nozzle. See Figure F.2.
C) Burners with a spill-back nozzle shall be fitted with a safety shut-off device conforming to ISO 23553-1 in both the feed line and return line. A nozzle shut-off valve may be fitted in lieu of the safety shut-off device fitted in the feed line and return line on condition that the nozzle shut-off valve is tested and approved as a safety shut-off device in accordance with ISO 23553-1. See Figures F.3 and F.4.
d) In the case of a burner with a nozzle head it may be necessary to have oil circulation up to the nozzle head, e.g. for pre-heahng purposes. Since there is only a nozzle shut-off device in service, it shall be ensured by a second independent measure that an unsafe fuel discharge is prevented. In the case of a nozzle shut-off device in accordance with ISO 23553-1 a second measure is not necessary. It shall be ensured that the nozzle shut-off device cannot be opened by the return pressure.
5.1 .2.7.3 Burners with a flow rate greater than 30 kg/h
Two series-connected safety shut-off devices shall be provided in the flow line of oil burners with a flow rate
> 30 kgfh. See Figure F.5.
One of the devices shall be of the fast-closing type. The second device may also be used as a final controlling element for the combustion chamber input. Its closing time shall not exceed 5 s.
The following also applies:
a) For burners with a spill-back nozzle, two safety shut-off devices shall be provided in the return line and a pressure monitoring device shall be provided between the power regulator and the safety shut-off device (see Figures F.6 and F.7). A nozzle shut-off valve may replace a safety shut-off device fitted in either the flow line or the return line provided it has been tested and certified as a safety shut-off device in accordance with ISO 23553-1.
Except where a step-regulated burner has a full-load stage, the safety shut-off devices shall be interlocked so that when the flow is open the return is not closed. This can be done, for example by
— making a mechanical connection between the safety shut-off devices in the flow and return (e.g. by means of an actuator), or
— by electric or pneumatic interlocking of the safety shut-off devices in the flow and return lines.ISO 22968-2010 pdf free download.
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