SNR non-return damper

SNR non-return damper
Donat Czapski

Donat Czapski – I am at your disposal

+48 695 244 220

info@grupa-wolff.com

Design
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From ATEX AUDIT to protection implementation

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SNR non-return damper

The SNR non-return damper is a simple and cost-effective solution for isolation of an explosion origin by closing the ductwork and preventing further propagation of explosion to the remainder of the protected installation.

  • Application: organic dust; metallic dust
  • System internal ATEX zone: Zone 20, 21 and 22
  • System external ATEX zone: Zone 21, 22
  • Max. reduced explosion isolation pressure, Pred: 0.5 bar
  • Max. Kst: 400 bar×m/s
  • Max. operating pressure: 50,000 Pa
  • Maximum air flow velocity: 30 m/s
  • Min. installation distance from potential explosion origin:
    • 1 m for dust with Kst < 200 bar m/s; 1 m for dust with Kst; 200 bar m/s;
    • Max. installation distance from potential explosion origin: 2-3 m
  • Material(s):
    • Carbon steel, gauge 30/10 or 40/10
    • AISI 304 grade stainless steel
  • System pressure drop
    • ≤ Ø 400: 10 mm H2O
    • ≤ Ø 700: 16 mm H20

Optional accessories available on request:

  • Open damper lock: engaged following an explosion trigger;
  • Closed damper position sensor;
  • Damper lock capacitative sensor: triggered by the flow of product.

The non-return dampers require a horizontal orientation and installation in line with a straight ductwork run. The ductwork diameter must be equal to that of both non-return damper ports.

SNR non-return damper
MODEL MAX KST A B C D E F G H
SNR 160 CLASS 3 - 400 [BAR M/S] 360 340 550 340 300 180 170 -
SNR 180 CLASS 3 - 400 [BAR M/S] 360 340 550 340 300 180 170 -
SNR 200 CLASS 3 - 400 [BAR M/S] 360 340 550 340 300 180 170 -
SNR 250 CLASS 3 - 400 [BAR M/S] 410 390 600 390 325 205 195 -
SNR 300 CLASS 3 - 400 [BAR M/S] 460 440 670 600 350 230 220 -
SNR 350 CLASS 3 - 400 [BAR M/S] 510 490 720 650 375 255 245 -
SNR 400 CLASS 3 - 400 [BAR M/S] 560 590 770 750 400 280 270 350
SNR 450 CLASS 3 - 400 [BAR M/S] 610 640 820 845 425 305 295 400
SNR 500 CLASS 3 - 400 [BAR M/S] 660 690 870 985 450 330 320 460
SNR 550 CLASS 3 - 400 [BAR M/S] 710 740 920 950 475 355 345 500
SNR 600 CLASS 3 - 400 [BAR M/S] 760 790 970 1045 500 380 370 550
SNR 650 CLASS 3 - 400 [BAR M/S] 810 840 1020 1145 525 405 395 605
SNR 700 CLASS 3 - 400 [BAR M/S] 860 890 1070 1195 550 430 420 650

Model approach to explosive safety in an industrial plant

Model approach to explosive safety in an industrial plant

Step 1
ATEX Audit

During the ATEX Audit, we will focus on deficiencies in explosive safety and indicate tasks that should be performed first to have the strongest impact on safety improvement.

Model approach to explosive safety in an industrial plant

Step 2
Protection Concept

The result of the ATEX Audit is also a preliminary concept of protecting the installation from explosion. It allows estimating the costs of protections. After testing the explosiveness parameters of the dust from the installation, we move on to the final concept and design.

Model approach to explosive safety in an industrial plant

Step 3
Design and selection of protections

After accepting the concept and testing the explosiveness parameters of the dust from the installation, we proceed to the final selection of explosion protections and create a design that takes into account all required changes in production.

Model approach to explosive safety in an industrial plant

Step 4
“Turnkey” delivery and installation

We coordinate the entire delivery and installation process of protections. We have our own service teams with experience in performing installation without the need to stop the investor’s plant operation.

Model approach to explosive safety in an industrial plant

Step 5
Execution of ERA and EPD

We conduct a post-implementation Explosion Risk Assessment (ERA) and prepare (or update) the Explosion Protection Document (EPD). We usually also conduct training for the crew in the field of explosive safety.

Secure your industrial plant

Do you have any questions?

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DONAT CZAPSKI - I am at your disposal

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