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Shand & Jurs 94240 Free Vent

Open Atmospheric Free Vent

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Shand & Jurs 94240 Free Vent

For specifying engineers, facility designers, and operators of non-pressurized storage systems, the Shand & Jurs 94240 delivers continuous atmospheric venting for tanks designed to operate at ambient pressure, with no pressure or vacuum regulation.

Unlike conservation vents that hold the tank closed against a weight-loaded or spring-loaded pallet, the 94240 contains no pallets, springs, or sealing components. The result is unrestricted tank-to-atmosphere communication without blowdown behavior, setpoint drift, or mechanical wear.

A screened weather hood limits ingress of debris, precipitation, and insects while allowing continuous airflow. Standard cast aluminum construction supports general outdoor and industrial service; cast iron is available for heavier-duty requirements and alternate materials are offered for severe exposure.

Available 2, 3, 4, 6, 8, and 10 inches with ANSI Class 125/150 flat-face connections, with optional threaded connections and a cable-operated flame snuffer for fire suppression on open atmospheric tank service.

Shand & Jurs 94240
Shand & Jurs 94240 Free Vent
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Features

Open Atmospheric Design

Maintains unrestricted tank-to-atmosphere communication without pressure or vacuum regulation, matching non-pressurized tank designs that do not require conservation venting.

Screened Weather Hood

Limits ingress of precipitation, airborne debris, and insects while preserving continuous airflow, protecting the tank interior from contamination sources.

No Moving Parts

Eliminates the pallet wear, blowdown behavior, and setpoint drift associated with regulated vent designs, simplifying long-term maintenance exposure.

2 to 10 Inch Range

Covers standard atmospheric tank nozzle dimensions for water, agricultural, and overflow service without custom machining or adapter plates.

ANSI 125/150 Flat-Face Flange

Integrates into standard refinery, chemical, and utility piping without field modification, simplifying installation and retrofit into existing tank-top hardware.

Optional Flame Snuffer

Cable-operated disc provides fire suppression capability for exposed atmospheric tank installations; tank height is specified at time of order.

Applications

  • Atmospheric Tanks: Provides continuous venting for storage vessels designed to operate at ambient pressure where conservation venting is not specified by design.
  • Open Vent Systems: Supports open-vent tank architectures where routine breathing is intentionally unregulated and pressure control is handled by separate devices or process design.
  • Non-Pressurized Storage: Suited to utility, service, and buffer tanks where no pressure or vacuum relief is required and routine airflow must remain unimpeded.
  • Water Storage Tanks: Maintains atmospheric equalization on potable, process, and fire-water tanks while a screened hood excludes debris, insects, and precipitation.
  • Agricultural Tanks: Standard cast aluminum construction supports continuous atmospheric venting for open-vent agricultural storage in outdoor environments.
  • Overflow Venting Systems: Provides unrestricted air relief on overflow and drain vessels where regulated vent performance would be unnecessary and introduce maintenance exposure.
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Specifications

Parameter

Specification

Device Type

Open atmospheric free vent

Pressure Regulation

None (open atmospheric)

Nominal Sizes

2″, 3″, 4″, 6″, 8″, 10″

Flanged Connections

ANSI 125/150 Flat Face

Body

Cast Aluminum (standard); Cast Iron (optional)

Screen

Galvanized Steel (standard); Stainless Steel available

Lever

Malleable Iron (standard); Cast Aluminum available

Disc

Cast Aluminum (standard); Cast Iron or Cast Brass available

Snuffer Cable

Stainless Steel (optional — specify tank height at order)

Options

Flame snuffer (cable-operated), stainless steel screen, cast iron body, cast iron or cast brass disc, cast aluminum lever, threaded connection

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

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Is the 94240 a conservation vent?

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No. The 94240 is a free vent — an open atmospheric vent with no pallets, springs, or sealing components. It is specified where continuous unrestricted airflow is required by design. If the tank needs to be held closed against a pressure or vacuum setpoint, a conservation vent such as the Shand & Jurs 9413X weight-loaded or 9414X spring-loaded series is the correct choice.

What does the screened hood protect against?

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The screened weather hood keeps out debris, rain, snow, and insects while allowing continuous airflow, protecting tank interiors from contamination without restricting vent capacity.

Is a flame snuffer included?

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A flame snuffer is available as an option. It uses a cable-operated disc to suppress fire on exposed atmospheric-tank service. When ordering, specify tank height so the cable is sized correctly.

What size and connection options are available?

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The 94240 is available in 2″, 3″, 4″, 6″, 8″, and 10″ nominal sizes with ANSI Class 125/150 flat-face flanges. A threaded connection option is available for installations where flanged mounting is not required.

What are the standard body materials?

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Standard body material is cast aluminum. Cast iron is available as a heavier-duty alternative. Alternate screen, lever, and disc materials — including stainless steel, cast iron, cast brass, and cast aluminum — are offered for corrosive or weight-sensitive applications.

When should I choose the 94240 over the 94241 Hooded Free Vent?

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The 94240 is the base open atmospheric vent. The 94241 is a hooded variant with extended hood geometry that provides stronger protection against wind-driven rain and coastal exposure. Where the installation is sheltered or indoors, the 94240 is typically sufficient; for exposed outdoor, coastal, or large-size applications, the 94241 is recommended.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 94240 free vent provides continuous atmospheric venting for non-pressurized storage systems where pressure and vacuum control are handled by separate devices or design. With no moving components, a screened weather hood, and standard ANSI Class 125/150 connections, the 94240 delivers straightforward, specification-ready atmospheric venting across water, agricultural, and overflow service. It fits within Cognesense’s tank-safety portfolio to help engineers measure, monitor, and protect what matters most.

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