DR/EU

In-Line Detonation Flame Arrester for unstable and stable detonations and deflagrations in right angle design with a shock absorber, unidirectional

low number of FLAMEFILTER^® discs due to shock absorber technology
quick removal and installation of the complete PROTEGO^® flame arrester and the individual FLAMEFILTER^® in the casing
modular design enables replacement of the individual FLAMEFILTER^® discs
provides protection against deflagrations and stable and unstable detonations
right-angle design eliminates need for pipe elbows
advanced design for higher operating temperatures and pressures
low pressure loss results in low operating and lifecycle costs
cost-effective spare part

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Function and Description

The PROTEGO^® DR/EU series of in-line detonation flame arresters represents further development of PROTEGO^® flame arrester series DR/ES, which has been successfully used in industry for decades.

The device protects against deflagrations and stable and unstable detonations. The classic right-angle design offers considerable costs and maintenance advantages over the straight-through design.

Once a detonation enters the flame arrester, energy is absorbed from the detonation shock wave by the integrated shock absorber (1) before the flame is extinguished in the narrow gaps of the FLAMEFILTER^® (3).

The PROTEGO^® flame arrester unit (2) consists of several FLAMEFILTER^® discs and spacers firmly held in the FLAMEFILTER^® casing (4). The gap size and number of FLAMEFILTER^® discs are by the operating conditions of the flowing mixture (explosion group, pressure, temperature). This device is can be used for explosion groups from IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).

The standard design can be used with an operating temperature of up to +60°C / 140°F and an absolute operating pressure acc. to table 3. Devices with special approval for higher pressures and temperatures are available upon request.

Type-approved in accordance with the current ATEX Directive and EN ISO 16852, as well as other international standards.

Dimensions

To select the nominal size (DN), please use the flow capacity charts on the following pages

DN	25 / 1"	32 / 1¼“	40 / 1½“	50 / 2“	65 / 2½“	80 / 3"	100 / 4"	125 / 5"	150 / 6"
a	125 / 4.92	125 / 4.92	153 / 6.02	155 / 6.10	198 / 7.80	200 / 7.87	250 / 9.84	332 / 13.07	335 / 13.19
b	140 / 5.51	140 / 5.51	183 / 7.20	185 / 7.28	223 / 8.78	225 / 8.86	290 / 11.42	357 / 14.06	360 / 14.17
c	210 / 8.27	210 / 8.27	290 / 11.42	290 / 11.42	365 / 14.37	365 / 14.37	440 / 17.32	535 / 21.06	535 / 21.06
c1	285 / 11.22	285 / 11.22	395 / 15.55	395 / 15.55	500 / 19.69	500 / 19.69	595 / 23.43	750 / 29.53	750 / 29.53
d	150 / 5.91	150 / 5.91	210 / 8.27	210 / 8.27	275 / 10.83	275 / 10.83	325 / 12.80	460 / 18.11	460 / 18.11
e	495 / 19.49	495 / 19.49	600 / 23.62	600 / 23.62	705 / 27.76	705 / 27.76	795 / 31.30	950 / 37.40	950 / 37.40

Dimensions in mm / inches

Material selection for housing

Design	B	C	D
Housing	Carbon Steel	Stainless Steel	Hastelloy
Heating jacket (DR / EU-H-(T)-...)	Steel	Stainless Steel	Stainless Steel
Cover with shock absorber	Steel	Stainless Steel	Hastelloy
O-Ring	FPM*	PTFE	PTFE
Flame arrester unit	A	C, D	E	Special materials upon request

* for devices exposed to elevated temperatures above 150°C / 302°F (T150), gaskets made of PTFE. The housing and cover with the shock absorber can also be delivered in steel with an ECTFE coating.

Material combinations of flame arrester unit

Design	A	C	D	E
FLAMEFILTER^® cage	Steel	Stainless Steel	Stainless Steel	Hastelloy
FLAMEFILTER^®*	Stainless Steel	Stainless Steel	Hastelloy	Hastelloy
Spacer	Stainless Steel	Stainless Steel	Hastelloy	Hastelloy

* the FLAMEFILTER® are also available in the materials Tantalum, Inconel, Copper, etc. when the listed housing and cage materials are used. Special materials upon request

Selection of explosion group

MESG	Expl. Gr. (IEC / CEN)	Gas Group (NEC)
> 0,90 mm	IIA	D
≥ 0,65 mm	IIB3	C

Special approvals upon request

Selection of max. operating pressure

Expl. Gr.	DN	25 / 1"	32 / 1¼"	40 / 1½"	50 / 2"	65 / 2½"	80 / 3"	100 / 4"	125 / 5"	150 / 6"
IIA	Pmax	1,6 / 23.3	1,6 / 23.3	1,6 / 23.3	1,6 / 23.3	1,6 / 23,.3	1,6 / 23.3	1,5 / 21.7	1,2 / 17.4	1,2 / 17.4
IIB2	Pmax								1,4 / 20.3	1,4 / 20.3
IIB3	Pmax	1,6 / 23.2	1,6 / 23.3	1,6 / 23.3	1,6 / 23.3	1,6 / 23.3	1,6 / 23.3	1,4 / 20.3	1,2* / 17.4	1,2* / 17.4

Pmax = maximum allowable operating pressure in bar / psi absolute, higher operating pressure upon request, * Special flame arrester unit

Specification of max. operating temperature

≤ 60°C / 140°F	Tmaximum allowable operating temperature in °C
-	Designation

higher operating temperatures upon request

Flange connection type

EN 1092-1; Form B1

ASME B16.5 CL 150 R.F.

Design Types and Specifications

There are four different designs available:

Basic design of the detonation arrester	DR/EU- – –
In-line detonation flame arrester with integrated temperature sensor* as additional protection against short time burning of one side	DR/EU- T –
In-line detonation flame arrester with heating jacket	DR/EU- H –
in-line detonation flame arrester with integrated temperature sensor* and heating jacket	DR/EU- H - T

*Resistance thermometer for device group II, category (1) 2 (GII cat. (1) 2)

Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.