Explosion protection concept

Explosion protection concept The matrix below represents the explosion protection concept for the different types of application equipment. The applicability of the A-measures outlined must be checked in order to achieve a reduction in the zone from the original zone. Technical regulations specify the mandatory implementation of certain A-measures under defined framework conditions. These measures are shown correspondingly highlighted. The exact description is laid down in the individual chapters.

Equipment:	Mixing equipment for coating materials	Pneumatic application systems	Electrostatic spray systems	Dryers	Combined spray and drying booths
	A	A	A	A	A
	AR	AR	AR
		AT	AT
		AP	AP
	AD	AD	AD		AD
	AV	AV	AV	AV	AV
	AE
		AC	AC	AC	AC
				AI

After implementation of the A-measures, there is generally a residual probability of an explosive atmosphere occurring in the application equipment, despite the limitation that can be achieved in the occurrence of an explosive atmosphere. The areas must be divided into zones, as described in chapter A, depending on the anticipated frequency of the occurrence of an explosive atmosphere. The ignition sources listed below can occur, as a result of the process, in the areas in question. It is important to ensure that all ignition sources which are inadmissible for the zone are reliably ruled out by using the protective measures described.

Equipment:	Mixing equipment for coating materials	Pneumatic application systems	Electrostatic spray systems	Dryers	Combined spray and drying booths
	I	I	I	I	I
	IE1, IE2, IE3, IE3.2, IE5, IE6, IE7, IE8	IE1, IE2, IE3, IE3.1, IE3.2, IE6, IE7, IE8, IE10,	IE1, IE2, IE3, IE3.1, IE3.2, IE6, IE7, IE8, IE10, IE13	IE1	IE1, IE2, IE3, IE3.1, IE3.2, IE6, IE7, IE8, IE10, IE13
	IH1, IH3, IH4, IH5	IH1, IH2, IH3, IH4, IH5	IH1, IH2, IH3, IH4, IH5	IH1, IH2, IH3, IH4,	IH1, IH2, IH3, IH4, IH5
	IS1, IS2	IS1, IS2	IS1, IS2	IS1, IS2	IS1, IS2
	IR1, IR2	IR1, IR2	IR1, IR2	IR1, IR2	IR1, IR2

If it is not possible, or only possible to an unsatisfactory extent, to rule out all ignition sources which are inadmissible for the zone (please see the table for the effectiveness of the ignition source in zones), the extent of any explosion must be restricted to a harmless level by means of the design measures outlined below. Technical regulations require the mandatory implementation of certain D-measures under defined framework conditions. These measures are shown correspondingly highlighted. The exact description is laid down in the individual chapters.

Equipment:	Mixing equipment for coating materials	Pneumatic application systems	Electrostatic spray systems	Dryers	Combined spray and drying booths
	C	C	C	C	C
				CM
		CP	CP	CP	CP
			CS		CS

It is not necessary to use each of the I-measures listed in the table for every zone. For Zone 2, for example, only those ignition sources which are present operationally have to be ruled out. In Zone 1, on the other hand, it is also necessary to rule out ignition sources which can occur only in the event of foreseeable malfunctions. In Zone 0 even those ignition sources which can only occur with faults which are expected to occur rarely are inadmissible (see chapter I).

	Zone 0	Zone 1	Zone 2
IE11), IE6, IE13	Inadmissible	Inadmissible	Inadmissible
IE2, IE3, IE3.1, IE3.2, IE5, IE8, IE9, IE10	Inadmissible	Inadmissible	Admissible since not occurring in practice
IH1	Inadmissible	Inadmissible	Inadmissible
IH2, IH3, IH4	Inadmissible	Inadmissible	Admissible since not occurring in practice
IS1	Inadmissible	Inadmissible	Inadmissible
IS2	Inadmissible	Inadmissible	Admissible since not occurring in practice
IR1, IR2	Inadmissible	Inadmissible	Inadmissible

¹⁾ Although electrostatic discharge processes, as described in IE1, are not generally regarded as representing an operational ignition source, the regulations for application equipment require that the basic measures, such as earthing of equipment and providing an antistatic floor finish, be implemented, irrespective of the designated zone.