Deflagration Flame Arresters

WinSize Product Application Sheet

Deflagration Flame Arresters–Model 94406/94407

Deflagration Flame Arresters

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What is the Shand & Jurs model number?*

View Data Sheet (94406 Vertical Inline Deflagration Flame Arrester)

View Data Sheet (94407 Horizontal Inline Deflagration Flame Arrester)

What is the flange size?*

The nominal diameter and rating of the flange connection required for installing the arrester.

How to determine? Refer to tank or piping drawings, nozzle schedule, or measure the flange directly, including bolt circle and pressure class.

What are the materials of construction?*

The material(s) used for the arrester body, flame element, gaskets, and other wetted parts.

How to determine? Match materials with the process fluid’s chemical compatibility and corrosion resistance using the product SDS, process conditions, and corrosion data. Consult engineering specifications or product catalog for available material options.

1. What is the normal operating flow?*

Normal operating flow tells us the typical volume of gas or vapor moving through your system during standard operation. This helps size the flame arrester correctly.

How to determine? Look at your tank venting or process flow records under normal, steady conditions. If unavailable, your process engineer or flowmeter data will provide this.

2 - What is the maximum flow rate?*

The maximum flow rate is the highest expected gas/vapor flow, such as during tank filling or emergency venting. Arrester design must handle these peaks safely.

How to determine? Review pump transfer rates, maximum tank fill rates, or worst-case emergency venting scenarios. Operations or safety data sheets may have these numbers.

3- What is the operating pressure?*

Operating pressure defines the steady-state internal pressure under normal use. This ensures the arrester performs without creating excessive backpressure.

How to determine? Check your system pressure gauge or P&ID diagrams. Tank vents are often measured in inches of water column (e.g., +2" WC).

4 - What is the maximum allowable pressure drop?*

Pressure drop measures flow resistance across the arrester. Every system has limits before performance or safety is affected.

How to determine? Ask your process engineer or refer to tank/line specifications. If unknown, share your operating pressure range — we can recommend safe values.

5 - What is the operating temperature?*

Gas temperature impacts arrester performance and material choice. Extreme temperatures may require special metals or cooling spacing.

How to determine? Use a thermometer, temperature gauge, or process specification. If temperatures fluctuate, note both normal and maximum values.

6 - What is the gas/vapor composition (Assume NEC Group D Vapors.)?*

The chemical makeup of the vapor affects ignition risk and arrester selection. Group D vapors (e.g., gasoline, propane, ethanol) are most common, but specifics matter.

How to determine? Check your MSDS (Material Safety Data Sheet) or chemical process documentation. If unsure, list the main chemicals present.

7 - What is the distance from the flame/ignition source?*

Flame arresters work differently depending on ignition proximity. Short distances mean faster flame speeds and more severe conditions.

How to determine? Measure the pipe length between the arrester and the possible ignition point (e.g., flare, open flame, static source).

8 - What is the pressure from the ignition source?*

Ignition pressure determines the intensity of the flame front entering the arrester. Higher pressures require more robust designs.

How to determine? Use equipment specs (e.g., compressors, engines, burners). If unknown, describe the ignition source — we can estimate typical ranges.

9 - What is the mounting configuration?*

Orientation (vertical, horizontal, inline, end-of-line) affects arrester performance and maintenance. Correct mounting ensures safety and drainage.

How to determine? Look at where you plan to install it — on top of a vent stack, inline with piping, or at an outlet. A photo often helps us verify.

10 - What is the auxiliary connection (3/4" NPT Connections.)?*

Auxiliary ports allow for accessories like pressure gauges, temperature sensors, or purge lines. They improve monitoring and safety.

How to determine? Decide whether you need monitoring points (pressure, temperature, purge gas) connected to the arrester. If unsure, we can recommend based on your application.

11 - If horizontal configuration, straight pipe: specify drain plugs.*

Drain plugs prevent liquid accumulation in horizontally mounted arresters, which can block flow or reduce effectiveness.

How to determine? Check if your process generates condensation or liquid carryover. If unsure, drains are usually recommended for safety.

12 - If horizontal configuration, straight pipe: list number of pipe bends.*

Pipe bends influence turbulence and flame velocity. The number and angle of bends impact arrester sizing and performance.

How to determine? Count the elbows or bends between the arrester and ignition source. If you don’t know, provide a sketch or piping layout.

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