DA-CG
In-Line Detonation Flame Arrester for unstable and stable detonations and deflagrations in a straight through design with shock absorber, bidirectional
- provides protection against deflagrations and stable and unstable detonations
- low number of FLAMEFILTER® discs due to shock absorber technology
- modular design enables individual cleaning and replacement of the FLAMEFILTER® discs
- different design allow scalable pressure loss over the area of the FLAMEFILTER®
- maintenance-friendly design
- available in large nominal widths
- advanced design for higher operating temperatures and pressures
- bi-directional operation, as well as any flow direction and installation position
- installation of temperature sensors possible
- minimal pressure loss resulting in low operating and lifecycle costs
- cost-effective spare parts
Function and Description
The PROTEGO® DA-CG series of detonation arresters was mainly developed for the North American market and optimized to meet the demands of the US Coast Guard. The devices are symmetrical and offer bi-directional flame arresting for deflagrations and stable and unstable detonations.
The effective shock absorber (1) greatly reduces the speed of incoming detonations. This leads to improved flame extinguishing in the narrow gaps of the FLAMEFILTER® (3).
The flame arrester essentially consists of two housing parts with an integrated shock absorber and the PROTEGO® flame arrester unit (2) in the center. The PROTEGO® flame arrester unit is modular and consists of several FLAMEFILTER® discs and spacers firmly held in a FLAMEFILTER® casing. The number of FLAMEFILTER® discs and their gap size depends on the arrester‘s intended use.
By specifying the operating conditions, such as the temperature, pressure, explosion group, and the composition of the fluid, the optimum in-line detonation flame arrester can be selected. Type PROTEGO® DA-CG flame arresters are available for explosion groups IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).
The standard design can be used at an operating temperature of up to +60°C / 140°F and an absolute operating pressure acc. to table 3. Devices with special approvals for higher pressures and higher temperatures are available upon request.
The flame arresters have been approved in accordance with the American Standard 33 CFR part 154 and are accepted by the US Coast Guard.
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 | 150 / 6" | 150 / 6" | 200 / 8" | 300 / 12" | 400 / 16" | 500 / 20" | 600 / 24 | 700 / 28" | 800 / 32" | 1000 / 40" | 1200 / 48" |
| DN | ≤ 50 / 2" | 65, 80 / 2 ½“, 3 | ≤ 100 / 4" | ≤ 150 / 6" | ≤ 200 / 8" | ≤ 250 / 10" | ≤ 300 / 12" | ≤ 350 / 14" | ≤ 400 / 16" | ≤ 500 / 20" | ≤ 600 / 24" |
| a | 285 / 11.22 | 285 / 11.22 | 340 / 13.39 | 460 / 18.11 | 580 / 22.83 | 715 / 28.15 | 840 / 33.07 | 1025 / 40.35 | 1025 / 40.35 | 1255 / 49.41 | 1485 / 58.46 |
| b | 650 / 25.59 | 650 / 25.59 | 700 / 27.56 | 800 / 31.50 | 900 / 35.43 | 1100 / 43.31 | 1250 / 49.21 | 1500 / 59.06 | 1500 / 59.06 | 1700 / 66.93 | 2000 / 78.74 |
| c | 300 / 11.81 | 300 / 11.81 | 330 / 12.99 | 380 / 14.96 | 490 / 19.29 | 540 / 21.26 | 590 / 23.23 | 690 / 27.17 | 690 / 27.17 | 790 / 31.10 | 880 / 34.65 |
Material selection for housing
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Gasket | PTFE | PTFE |
| Flame arrester unit | A | 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) |
| > 0,90 mm | IIA | D |
| ≥ 0,65 mm | IIB3 | C |
Selection of max. operating pressure
| Expl. Gr. | DN | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" | 350 / 14" | 400 / 16" | 500 / 20" | 600 / 24" |
| NG | 150 / 6'' | 150 / 6'' | 200 / 8'' | 300 / 12'' | 400 / 16'' | 500 / 20'' | 600 / 24'' | 700 / 28'' | 800 / 32'' | 1000 / 40'' | 1200 / 48'' | |
| IIA (D) | Pmax | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 | 1,2 / 17.4 |
| IIB3 (C) | Pmax | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 | 1,6 / 23.2 |
Specification of max. operating temperature
| ≤ 60°C / 140°F | Tmaximum allowable operating temperature in °C |
| - | 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 | DA-CG- – |
In-line detonation flame arrester with integrated temperature sensor* as additional protection against short time burning of one side | DA-CG- T |
Detonation arrester with two integrated temperature sensors* as additional protection against short time burning from both sides | DA-CG- TB |
Additional special arresters upon request
*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”.
