DMN-WESTINGHOUSE Explosion-Proof Rotary Valves
Code: RV-Ex.pro-E.B.01.D 05-2016
10
Relationship of the maximum surface temperature of the equipment and the
minimum ignition temperature of dust cloud and dust layer.
Dust cloud.
Maximum surface temperature = 2/3 x Minimum Ignition Temperature
Dust layer up to 5mm.
Maximum surface temperature = Smouldering Temperature – 75 K
Depending on the properties of the product to be handled, it can be necessary to
reduce the frictional area of the blades that maintain the air pressure in the valve.
This can be done in the first instance by using blades that are chamfered on 3 sides.
Examples: PVC powder tends to smear, Sugar glazes etc.
If in doubt please contact DMN.
If the properties of the product to be handled are not known then the surface
temperature must be checked several times after starting the valve to see if there is
a temperature increase.
If the surface temperature is higher then listed on the nameplate,
the rotary valve must be stopped immediately.
It is not allowed to exceed above the maximum surface temperature
listed on the nameplate.
If in doubt please contact DMN.
The plant operator must ensure that any possible dust accumulation does not
exceed a maximum thickness of 5 mm in accordance with EN50281-1-2.
There must be no flammable solvents within the dust.
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