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Shand & Jurs 94241 Hooded Free Vent

Hooded Open Atmospheric Free Vent

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Shand & Jurs 94241 Hooded Free Vent

For specifying engineers, coastal-facility designers, and operators of outdoor atmospheric storage, the Shand & Jurs 94241 hooded free vent provides continuous atmospheric venting with enhanced weather protection for tanks designed to operate at ambient pressure.

Unlike regulated conservation vents, the 94241 contains no pallets, springs, or sealing components — continuous open airflow without blowdown behavior, setpoint drift, or mechanical wear. Unlike the base 94240 free vent, the 94241 adds extended hood geometry for stronger environmental shielding.

The hood shields the screened airflow path from direct precipitation and wind-driven rain while maintaining unrestricted tank-to-atmosphere communication. Standard aluminum construction supports −65°F to 250°F; carbon steel and 316 stainless steel bodies extend service to 350°F and coastal or corrosive environments.

Available 2 through 30 inches with ANSI 125/150 flanged connections. API-650 drilling is available in 20 and 24 inch sizes, and EN1092-1 or JIS drillings are offered as options for international tank installations.

Shand & Jurs 94241
Shand & Jurs 94241 Hooded Free Vent
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Features

Extended Hood Geometry

Shields the screened airflow path from wind-driven rain, debris, and coastal exposure while maintaining continuous unrestricted tank-to-atmosphere communication.

Open Atmospheric Design

Maintains unrestricted tank equalization with no pressure or vacuum regulation, matching non-pressurized tank designs without introducing mechanical wear points.

No Moving Components

Eliminates pallet wear, blowdown, or setpoint maintenance associated with regulated vents, lowering inspection frequency and lifecycle service cost.

Screened Vent Opening

Limits intrusion of insects and foreign material while preserving full venting capacity in exposed outdoor and industrial environments.

Direct Flanged Mounting

Integrates into standard ANSI Class 150 tank nozzles; API-650, EN1092-1, and JIS drillings available for regional and international installations.

Corrosion-Resistant Options

Carbon steel and 316 stainless steel bodies, with 316 SS hoods and hardware, extend service life in coastal, marine, or chemical exposure environments.

Applications

  • Atmospheric Storage Tanks: Provides continuous open venting on tanks designed to operate at ambient pressure where conservation venting is not specified by design or process.
  • Outdoor Installations: Extended hood geometry mitigates wind-driven rain and ambient-weather exposure, preserving tank integrity on exposed outdoor installations.
  • Agricultural Tanks: Supports open venting on outdoor agricultural and service tanks where routine airflow and environmental debris exclusion are the primary considerations.
  • Water Storage: Maintains atmospheric equalization on potable, process, and fire-water tanks while protecting interiors from precipitation, debris, and insect intrusion.
  • Open Vent Systems: Fits tank designs that intentionally leave routine breathing unregulated, with pressure control handled elsewhere in the process or design.
  • Coastal Environments: 316 stainless steel body, hood, and hardware options resist chloride and marine exposure on atmospheric tanks near coastal or offshore service.
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Specifications

Parameter

Specification

Device Type

Atmospheric free vent (hooded)

Pressure Regulation

None — continuous atmospheric vent

Sealing Method

None

Loading Method

None

Nominal Sizes

2″–30″

Connection Types

ANSI 125/150 FF; API-650 (20″ and 24″); EN1092-1 or JIS optional

Body Materials

Aluminum, Carbon Steel, or 316 Stainless Steel

Hood Materials

Aluminum or 316 Stainless Steel

Screen Materials

Galvanized Steel, Stainless Steel, or 316 Stainless Steel

Hardware

Stainless Steel or 316 Stainless Steel

Temperature Range (Aluminum)

−65°F to +250°F

Temperature Range (Carbon Steel)

−20°F to +350°F

Temperature Range (316 SS)

−65°F to +350°F

Options

Carbon steel or 316 SS body, 316 SS hood, stainless or galvanized screen, 316 SS hardware package, API-650 flange drilling (20″ and 24″), EN1092-1 or JIS flange drilling

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How is the 94241 different from the 94240?

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Both are open atmospheric free vents with no pallets, springs, or sealing components. The 94240 is the base configuration with a standard screened weather hood. The 94241 adds extended hood geometry for stronger protection against wind-driven rain, debris, and coastal exposure, and is offered in larger sizes (up to 30 inches) with more material and flange-drilling options.

What sizes and connection options are available?

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The 94241 is available 2 through 30 inches with ANSI 125/150 flat-face connections. API-650 drilling is available in 20- and 24-inch sizes for direct tank-roof manway mounting. EN1092-1 and JIS flange drillings are offered as options for international tank and process equipment standards.

Is the 94241 suitable for coastal service?

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Yes — that is one of the primary reasons to specify it over the 94240. Specify a 316 stainless steel body, 316 SS hood, 316 SS screen, and 316 SS hardware package together to resist chloride and marine exposure on atmospheric tanks installed near coastal or offshore service.

What body materials and temperature ranges are offered?

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Body materials are aluminum (−65°F to +250°F), carbon steel (−20°F to +350°F), and 316 stainless steel (−65°F to +350°F). Screen, hood, and hardware material selections are made independently to match service exposure.

Does the 94241 replace a conservation vent?

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No. The 94241 does not regulate pressure or vacuum. It is specified on tanks designed to operate at ambient pressure where conservation venting is not required. If the tank must be held closed against a setpoint, use a Shand & Jurs 9413X weight-loaded or 9414X spring-loaded conservation vent instead.

Is a screen required?

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Yes — a screen is integral to the design. Screen material choices include galvanized steel, stainless steel, and 316 stainless steel, allowing selection based on service exposure and expected service life.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 94241 hooded free vent provides continuous atmospheric venting with extended hood geometry for outdoor and coastal service. No moving components, no setpoint maintenance, and continuous tank equalization simplify operation for non-pressurized tank designs. With sizes through 30 inches, API-650 / EN1092-1 / JIS flange options, and full 316 stainless steel construction available, the 94241 fits within Cognesense’s tank-safety portfolio to help operators measure, monitor, and protect what matters most.

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