Shand & Jurs 94160 Pressure Relief Vent

For tank-farm specifiers, refinery engineers, and wastewater-facility designers, the Shand & Jurs 94160 pressure relief vent delivers high-capacity, economical overpressure protection for atmospheric storage tanks and low-pressure vessels where vacuum relief is not required.

Unlike combination pressure-and-vacuum vents that carry dual pallet assemblies, the 94160 runs a pressure-only architecture — fewer moving parts, simpler service, and lower maintenance exposure on tanks where vacuum relief is handled elsewhere or not needed.

Peripheral and center-stem pallet guidance keeps the pallet aligned under load, while a cushion-seated FEP diaphragm resists sticking from ice or gum formation. Standard set pressures begin at 0.5 oz/in². Optional Expanda-Seal holds leakage below 0.5 SCFH at 95 percent of setpoint.

Available in sizes 2 through 24 inches with ANSI, EN1092-1, or API-650 flange drillings. Field-replaceable seat rings support in-place maintenance, and Shand & Jurs WinSize software provides defensible sizing documentation.

Shand & Jurs 94160 Pressure Relief Vent

Features

Provides stable, predictable setpoint control during routine thermal breathing and pressure-upset events, with reseating behavior repeatable across service cycles.

Peripheral and center-stem guidance keeps the pallet aligned during lift and reseating, preserving sealing integrity across repeated operating cycles.

Reduces adhesion from ice or gum formation at the seat interface, maintaining reliable sealing performance in outdoor and cold-weather installations.

Supports in-place seat maintenance without replacing the full vent assembly, reducing outage duration and total lifecycle cost on high-service tanks.

Available on setpoints 1.5 oz/in² and higher, holds leakage under 0.5 SCFH at 95 percent of setpoint, reducing evaporative loss near operating pressure.

Available 2 through 24 inches with ANSI, EN1092-1, or API-650 drillings, covering small process tanks through large atmospheric storage tanks in one platform.

Applications

Atmospheric Storage Tanks: Protects tank shells and roofs from thermal expansion pressure rise during daily breathing cycles and routine product-movement excursions.
Low-Pressure Vessels: Provides economical overpressure protection on vessels where vacuum relief is handled separately or is not a required design consideration.
Chemical Storage: Standard FEP and optional FKM, NBR, or PFA diaphragms extend compatibility to acid, caustic, and specialty-chemical vapor service.
Wastewater Facilities: Protects covered digester tanks and holding vessels against thermal and biological pressure events while keeping maintenance exposure low.
Petrochemical Terminals: Covers high-throughput tanks up to 24 inches with a single platform, reducing part-number proliferation on large storage installations.
Corrosive Liquid Service: Cast steel or 316 stainless steel body, 316 SS pallets, and alternate diaphragm materials extend service life in aggressive tank atmospheres.

Specifications

Parameter

Specification

Device Type

Weight-Loaded Pressure Relief Vent

Standard Set Pressure

0.5 oz/in²

Adjustable Range

Up to 16 oz/in² (consult factory for higher)

Leakage Performance

Standard pallet: <1 SCFH air at 90% of setpoint.
Expanda-Seal: <0.5 SCFH at 95% of setpoint (setpoints ≥1.5 oz/in²).

Sealing Method

Diaphragm-sealed pallet

Loading Method

Weight-loaded

Nominal Sizes

2″, 3″, 4″, 6″, 8″, 10″, 12″, 16″, 20″, 24″

Seat Size Note

Pallet seat is one nominal size smaller than the body

Flanged Connections

ANSI Class 150 FF/RF; EN1092-1 PN16 FF/RF; API-650 (RF not available in aluminum)

Body Materials

Aluminum, Cast Steel, or 316 Stainless Steel

Pallets

Aluminum or 316 Stainless Steel

Weights

Lead (standard); 316 Stainless Steel available

Diaphragm

FEP (standard); FKM, NBR, or PFA available

Hardware

Stainless Steel

Temperature Range

Aluminum −65°F to +250°F; Carbon Steel −20°F to +350°F; 316 SS −65°F to +350°F

Sizing Support

Shand & Jurs WinSize (EZ-Flow) software

Options

Expanda-Seal pallet, alternate diaphragm materials, ATEX certification, ANSI / EN1092-1 / API-650 flange drilling, stainless steel hood, pressure limit switch

2026 COST ESTIMATE

Contact Support

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

Why choose a pressure-only vent instead of a P/V vent?

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Some tank designs do not require vacuum relief at the same roof penetration — vacuum may be handled by a separate device, by tank design, or by the process itself. Where that is the case, a pressure-only vent like the 94160 is the economical choice: fewer moving parts, a simpler pallet architecture, and lower maintenance exposure than a combination P/V vent.

How large does the 94160 scale?

The 94160 is available in 10 nominal sizes from 2 inches through 24 inches, covering small process tanks through large atmospheric storage tanks on a single platform. The pallet seat is one nominal size smaller than the body.

What flange drillings are supported?

ANSI Class 150 FF/RF, EN1092-1 PN16 FF/RF, and API-650 flange drilling are all available. Note: raised-face (RF) flanges are not available in aluminum.

When is Expanda-Seal appropriate?

Expanda-Seal is a self-energizing diaphragm seal that holds leakage under 0.5 SCFH at 95% of setpoint. It is available on setpoints 1.5 oz/in² and higher and is recommended where routine vapor loss near setpoint matters — VOC-regulated sites, high-value product tanks, and nitrogen-blanketed tanks where leakage raises blanketing-gas cost.

Are field-replaceable seat rings standard?

Yes. The 94160 supports in-place seat maintenance without replacing the full vent assembly, which reduces outage duration and lifecycle cost on tanks with frequent service requirements.

How is relief capacity sized?

Relief capacity is sized per API 2000 methodology. Shand & Jurs WinSize (EZ-Flow) software walks engineers through flow, pressure, and size selection, producing documentation suitable for engineering and regulatory review.

Is a remote position indicator available?

Yes. A pressure limit switch can be specified to provide remote indication when the vent is in the relieving position, supporting DCS integration or alarm handling on monitored tanks.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 94160 pressure relief vent delivers high-capacity, economical overpressure protection for atmospheric storage tanks and low-pressure vessels where vacuum relief is not required. Guided pallet geometry, diaphragm sealing, and optional Expanda-Seal technology support stable setpoints, reduced vapor loss, and predictable service life. With sizes from 2 to 24 inches, field-replaceable seats, and WinSize sizing support, the 94160 fits within Cognesense’s portfolio to help terminals and chemical sites measure, monitor, and protect what matters most.

94160 Pressure Relief Vent