Shand & Jurs 94100 High Pressure Vacuum Vent

For terminal operators, refinery engineers, and tank designers working with pressure-rated storage vessels, the Shand & Jurs 94100 provides vacuum relief for tanks that must tolerate elevated internal static pressure when not relieving.

Unlike atmospheric vacuum vents that cannot withstand high static pressure between relief events, the 94100 is designed for tanks rated up to 125 PSIG (6″ size) and 75 PSIG (10″ size), protecting against damaging vacuum without compromising vessel operating pressure integrity.

A balanced vacuum pallet delivers controlled lift during vacuum events and consistent reseating under cyclic conditions. A cushion-seated Buna-N seal disc enhances sealing at the seat interface, limiting nuisance air infiltration during normal operation. Vacuum settings are 1.5–4 oz/in² with higher settings available.

Supplied in 6″ and 10″ sizes with ANSI Class 150 flat-face flange connections, and rated from −20°F (−29°C) to +200°F (+93°C), the 94100 is spec-ready for petroleum and chemical storage where vacuum protection and high static pressure capability coexist.

Features

Withstands 125 PSIG (6″) and 75 PSIG (10″) when not relieving vacuum, allowing tank operation at elevated internal pressure without sacrificing vacuum protection.

Ensures smooth lift and closure during vacuum relief, reducing chatter and supporting predictable reseating behavior through repeated transient vacuum events.

Improves sealing at the seat interface to limit nuisance airflow during cycling, preserving tank vapor space integrity during normal (non-relief) operation.

Provides 1.5–4 oz/in² standard settings; higher vacuum provisions are available where specialized applications require elevated vacuum tolerance.

Allows direct access to internal components for inspection and service without replacing the full vent, simplifying scheduled outage and maintenance planning.

−20°F (−29°C) to +200°F (+93°C) operating range supports demanding storage environments without requiring specialty materials or temperature-specific substitutions.

Applications

High-Pressure Tanks: Delivers vacuum relief on tanks rated up to 125 PSIG (6") or 75 PSIG (10") where atmospheric vacuum vents cannot tolerate between-event static pressure.
Liquid Product Storage: Protects against vacuum deformation during rapid liquid withdrawal on pressurized storage holding petroleum, chemical, or process liquid inventory under routine operation.
Petroleum Service: Buna-N sealing and cast steel construction suit pressurized petroleum storage where vapor chemistry is compatible and vacuum protection is specified alongside pressure containment.
Chemical Storage: Provides vacuum protection on chemical tanks specified to operate at elevated pressure between relief events, avoiding dedicated vacuum hardware on separate nozzles.
Cold-Weather Service: Published operating range down to −20°F (−29°C) supports vacuum protection in cold-climate installations where thermal contraction drives transient vacuum conditions.
Process Facilities: Integrates with ANSI Class 150 piping on process and storage vessels where vacuum protection must coexist with elevated static pressure on the same nozzle.

Specifications

Parameter

Specification

Device Type

High-pressure vacuum vent

Standard Set Vacuum

1.5–4 oz/in² (standard range)

Adjustable Range

> 4 oz/in² provisions available (by ordering option)

Max Operating Pressure

125 PSIG (6″); 75 PSIG (10″) static pressure when not relieving

Sealing Method

Cushion-seated seal disc (Buna-N)

Loading Method

Balanced pallet (vacuum relief)

Nominal Sizes

6″ and 10″

Flanged Connections

ANSI Class 150 Flat Face

Temperature Range

−20°F (−29°C) to +200°F (+93°C)

Body

Cast steel

Seat

Phenolic (6″) or aluminum (10″)

Pallets

Aluminum

Pallet Seat Ring

Steel

Seal Disc

Buna-N

Screen

Galvanized steel (6″) or brass (10″)

Sizing Basis

Shand & Jurs WinSize (EZ-Flow)

Options

6″ or 10″ selection; elevated vacuum setting (> 4 oz/in²); alternate seat material per size; alternate screen holder material per size; non-standard vacuum setting

2026 COST ESTIMATE

Contact Support

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

How is the 94100 different from an atmospheric vacuum vent?

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Most vacuum vents are designed for atmospheric tanks and cannot withstand significant static pressure between relief events. The 94100 is specifically rated to tolerate 125 PSIG (6″) or 75 PSIG (10″) when not relieving, allowing vacuum protection on pressure-rated tanks without adding separate hardware on additional nozzles.

What vacuum settings are available?

Standard vacuum settings are 1.5–4 oz/in². Higher vacuum settings above 4 oz/in² are available as an ordering option for applications requiring increased vacuum tolerance. Non-standard settings should be specified at order entry.

What sizes and flange connections are offered?

The 94100 is available in 6″ and 10″ sizes, both with ANSI Class 150 flat-face flange connections. Size selection typically follows the vessel’s static pressure rating (125 PSIG for 6″, 75 PSIG for 10″).

What is the temperature range?

The 94100 operates from −20°F (−29°C) to +200°F (+93°C). This range is published directly on the datasheet and covers most petroleum and chemical storage service without requiring specialty-temperature construction.

How is relief capacity sized?

Capacity is sized using Shand & Jurs WinSize (EZ-Flow) based on anticipated vacuum flow rates and allowable pressure drops for the specific tank. Sizing documentation supports defensible engineering selection aligned with the applicable code-of-construction.

Can the vent be inspected without replacement?

Yes. A removable bolted cover allows direct access to internal components for inspection and service. This simplifies scheduled outage work and component replacement without removing the vent body from the tank nozzle.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 94100 High Pressure Vacuum Vent is chosen when vacuum relief must coexist with elevated static pressure on pressure-rated storage tanks. A balanced pallet, cushion-seated Buna-N seal, and 125/75 PSIG static pressure capability across 6″ and 10″ sizes deliver predictable vacuum admission and spec-ready integration into petroleum and chemical storage systems. For pressure-rated tank service, it is trusted wherever you need to measure, monitor, and protect what matters most.

94100 High Pressure Vacuum Vent