DAZ-S
In-Line Detonation Flame Arrester for stable detonations and deflagrations in a straight through design, uni-directional
- state of the art protection for hydrogen/air mixture
- minimal pressure loss resulting in low operating and lifecycle costs
- advanced design for higher operating temperatures and pressures
- installation of temperature sensors possible
- modular design enables replacement of the individual FLAMEFILTER®
- maintenance-friendly design
- cost-effective spare parts
Function and Description
The in-line detonation flame arresters type PROTEGO® DAZ-S are unidirectional flame arresters of the newest generation. The unidirectional (effective on one side) devices protect potentially explosive plants or plant sections (tanks, machines etc.) against ingression of flames which propagate from an ignition source in a pipe as a pipe deflagration or detonation. Based on flow and explosion dynamic calculations as well as decades of field tests, a product line was developed that offers minimum pressure losses with maximum safety.
The arrester essentially consists of two different housing parts (1) and the PROTEGO® flame arrester unit (2) in the center. The PROTEGO® flame arrester unit is modular and consists of several FLAMEFILTER® discs (3) and spacers firmly held in a FLAMEFILTER® casing.
The number of FLAMEFILTER® discs and their gap size depends on the arrester‘s intended use. The PROTEGO® DAZ-S flame arresters are available for explosion group IIC (NEC B).
The standard design can be used with an operating temperature of up to +60°C / 140°F . Numerous devices with special approval for higher pressures (see table 3) and higher temperatures (see table 4) are available upon request.
EU conformity according to the currently valid ATEX directive. Approvals according to other national/international regulations on request.
Dimensions
To select nominal width/nominal size (NG/DN) - combination, please use the flow capacity charts on the following pages
Additional nominal width/nominal size (NG/DN) - combinations for improved flow capacity upon request
| NG | 200 / 8" | 300 / 12" | |
| DN | ≤100 / 4" | ≤150 / 6" | |
| a | 340 / 13.39 | 445 / 17.52 | |
| b | IIC-P1,2-X2 | - | 640 / 25.20 |
| IIC-P1,2-X3 | 500 / 19.69 | - | |
| IIC-P1,3 | - | 640 / 25.20 | |
| c | 415 / 16.34 | 570 / 22.44 |
Material selection for housing
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Heating jacket (DAZ-S-(T)-H-...) | Steel | Stainless Steel |
| Gasket | PTFE | PTFE |
| Flame arrester unit | A, B | B |
Material combinations of flame arrester unit
| Design | A | B |
| FLAMEFILTER® cage | Steel | Stainless Steel |
| FLAMEFILTER®* | Stainless Steel | Stainless Steel |
| Spacer | Stainless Steel | Stainless Steel |
Selection of explosion group
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| < 0,50 mm | IIC | B |
Selection of max. operating pressure
| Marking | NG | 200 / 8" | 300 / 12" |
| DN | ≤100 / 4"' | ≤150 / 6" | |
| IIC-P1,2-X3 | Pmax | - | 1,2 / 17.4 |
| IIC-P1,2-X2 | Pmax | 1,2 / 17.4 | - |
| IIC-P1,3 | Pmax | - | 1,3 / 18.9 |
Specification of max. operating temperature
| ≤ 60°C / 140°F | ≤ 180°C / 356°F | ≤ 200°C / 392°F | Tmaximum allowable operating temperature in °C |
| - | X2 | X3 | Designation |
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
Design Types and Specifications
There are three different designs available:
Basic design of the detonation arrester | DAZ-S- |
In-line detonation flame arrester with integrated temperature sensor* as additional protection against short time burning of one side | DAZ-S-T |
In-line detonation flame arrester with heating jacket upon request | DAZ-Z-H |
Additional special arresters upon request
*Resistance thermometer (Ex i II 1/2 G Ex ia IIC T1…T6 Ga/Gb)
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”.
