Shand & Jurs Model 94306 Vertical End-of-Line Flame Arrester

Shand & Jurs® Model 94306 Vertical End-of-Line Flame Arrester

The Shand & Jurs® Model 94306 Vertical End-of-Line Flame Arrester is engineered for tank farm safety engineers, HSE and compliance managers, terminal operations leaders, and EPC project specifiers who need certified ignition protection at atmospheric vent discharge points on storage tanks and low-pressure vapor systems.

The Model 94306 establishes the flame-arresting boundary at the outlet of the vent piping rather than within the tank or vapor space. This protects connected equipment from external ignition while preserving normal atmospheric breathing behavior at the vent discharge.

Unlike inline detonation arresters that impose higher backpressure, the Model 94306 uses a spiral-wound crimped ribbon element to absorb heat from the flame front and quench combustion at the source, while maintaining open-vent flow during normal breathing cycles.

With FM approval for NEC Group D gases, multiple material options, and a removable tube bank for inspection, the Model 94306 supports defensible hazard analysis, predictable maintenance, and reliable long-term protection across regulated vent installations.

Shand & Jurs® Model 94306 Vertical End-of-Line Flame Arrester

Key Features

Quenches flame fronts by absorbing heat at the flame gap while preserving normal atmospheric vapor discharge capacity.

Places the flame-arresting point at the vent outlet rather than inside the tank system, supporting installation below PVRV, pressure, and free vents.

Certified ignition control for NEC Group D gas environments, supporting code acceptance and defensible hazard analysis.

Allows inspection and servicing of the element without disturbing connected piping, flange alignment, or vent stack orientation.

Enables monitoring of element condition across the flame bank so inspection and cleaning intervals can be based on measured performance.

Cast aluminum, cast steel, or 316 stainless steel construction maintains flame gap integrity in corrosive, wet, or condensable vapor service.

Available with ANSI Class 150 RF/FF or EN PN16 RF/FF drilling for direct integration with North American and European piping standards.

Preserves flame bank integrity during removal, inspection, and reinstallation, reducing the risk of seal or gap disruption during service.

Applications

Atmospheric Storage Tank Venting: Installed at tank vent stacks, PVRV outlets, and free vent terminations on fixed-roof storage tanks to stop external flame propagation into the vapor space.
Biogas and Digester Systems: Protects digester covers and biogas collection headers where low-pressure, combustible vapor must discharge upward without exposure to ambient ignition sources.
Solvent and Chemical Storage: Stainless-steel construction options support flame-gap integrity on solvent tanks and chemical vessels with corrosive or condensable vapor streams.
Low-Pressure Vapor Systems: Safeguards low-pressure vessels, vent collection systems, and open-vent piping where unrestricted breathing flow must be preserved during normal operation.

Technical Specifications

Parameter

Specification

Model

Shand & Jurs® 94306 Vertical End-of-Line Flame Arrester

Technology

Spiral-wound crimped ribbon flame arresting element

Size Range

2″, 3″, 4″, 6″, 8″, 10″, 12″

Temperature Range

−40 °F to 220 °F (−40 °C to 104.4 °C)

Maximum Operating Pressure

1.0 psig

Maximum Static Pressure

10 psig

Approval

FM Approved — NEC Group D

Installation Location

Within 10 pipe diameters of the ignition source

Flange Options

ANSI 150 RF/FF or EN PN16 RF/FF

Body Material

Cast Aluminum, Cast Steel, or 316 Stainless Steel

Element Material

Aluminum or 316 Stainless Steel

Hardware

18-8 Stainless Steel standard; 316 Stainless Steel available

Configuration

Vertical upward discharge

Discharge Behavior

Unrestricted vapor flow at normal breathing pressures

Sizing Support

Shand & Jurs WinSize pressure-drop software

2026 COST ESTIMATE

Contact Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

Why is the Model 94306 installed at the vent outlet instead of inline?

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Placing the flame-arresting boundary at the atmospheric discharge stops ignition at the point of exposure. This protects the tank vapor space without the higher backpressure of inline detonation arresters and avoids unintended pressure accumulation during normal breathing cycles.

What does FM approval for NEC Group D mean in practice?

FM approval confirms the Model 94306 is certified for ignition control in environments involving common atmospheric hydrocarbons such as gasoline vapors and natural gas. This supports regulatory acceptance and strengthens the defensibility of hazard analysis in permitted installations.

Can the flame-arresting element be inspected without removing the arrester from piping?

Yes. The removable tube bank assembly lets maintenance teams withdraw and inspect the element without disturbing connected piping or vent alignment. Differential pressure tap ports allow element condition monitoring so inspection timing can be based on measured performance rather than fixed schedules.

Which materials should I specify for corrosive or condensable vapor service?

316 stainless steel body and element construction is recommended for wet, sour, or chemically aggressive vapors. Protective coatings and alternative alloy options are available for severe environments where aluminum or carbon steel would degrade flame gap integrity over time.

How do I size the Model 94306 for a given vent system?

Flow capacity and pressure drop can be verified using the Shand & Jurs WinSize sizing software. The arrester must be installed within ten pipe diameters of the ignition source to maintain certified flame-arresting performance.

94306 Vertical End-of-Line Flame Arrester