Shand & Jurs 94050 PVC Conservation Vent

For chemical plant engineers, wastewater specifiers, and corrosion specialists, the Shand & Jurs 94050 PVC Conservation Vent provides pressure and vacuum relief for atmospheric storage tanks in highly corrosive service where metallic vents are prone to pitting, coating failure, and premature replacement.

Unlike coated or stainless-steel vents that eventually corrode where acids, toxic liquids, or aggressive vapors contact the wetted interior, the 94050 is constructed entirely of polyvinyl chloride (PVC), eliminating structural corrosion and extending service life in aggressive chemical environments.

A cushion-seated FEP diaphragm and guided weight-loaded pallets maintain consistent sealing through thermal breathing cycles, with pressure capability up to 8 oz/in² and vacuum capability up to 4 oz/in² depending on configuration. Relief is sized per API 2000 using Shand & Jurs WinSize (EZ-Flow).

Available in pressure-only, vacuum-only, or combined P/V configurations, in 2″–12″ sizes with ANSI 125/150 flat-face flanges, the 94050 integrates directly with standard atmospheric tank nozzle connections on corrosive chemical, acid, and wastewater tanks.

Features

Fully PVC body, seat, and pallets eliminate structural corrosion and coating degradation in aggressive chemical, acid, and oxidizing vapor service environments.

FEP diaphragm enhances sealing reliability under repeated pressure and vacuum cycling, maintaining consistent seat contact through routine thermal breathing.

Guided pallet geometry supports stable opening and reseating during normal tank breathing cycles, with predictable relief behavior under cyclic operation.

Pressure-only, vacuum-only, or combined P/V versions align device selection with specific tank-protection requirements on corrosive, aggressive, or toxic vapor storage.

Standard flat-face flange drilling integrates directly with atmospheric tank nozzle connections, simplifying retrofit and new-installation specification.

Relief capacity is sized per API 2000 using Shand & Jurs WinSize (EZ-Flow), supporting defensible vent selection based on anticipated flows and pressure drops.

Applications

Corrosive Chemical Storage: Fully non-metallic construction suits tanks holding corrosive chemicals where metallic vent bodies pit, coat, or fail prematurely under aggressive vapor contact.
Acid Service Tanks: PVC construction resists attack from acidic vapors and splash, extending vent service life on sulfuric, hydrochloric, and related acid storage applications.
Toxic Vapor Containment: Controlled pallet operation and combined P/V configuration limit unnecessary vapor release on toxic liquid tanks where fugitive emissions carry regulatory exposure.
Wastewater Process Tanks: Suits process and storage tanks in wastewater treatment where aggressive vapor streams degrade carbon steel and stainless vents over short service lives.
Petrochemical Storage: Provides atmospheric pressure and vacuum relief on petrochemical tanks containing aggressive intermediate products outside the range of standard metallic conservation vents.
Aggressive Media Service: PVC body resists a wide range of chemical vapors, reducing the need for specialty coatings, cladding, or exotic stainless grades on the vent body.

Specifications

Parameter

Specification

Device Type

PVC conservation vent (pressure and vacuum)

Configurations

Pressure-only, vacuum-only, or combined pressure/vacuum

Standard Set Pressure

0.5 oz/in² minimum

Maximum Pressure Setting

Up to 8 oz/in²

Maximum Vacuum Setting

Up to 4 oz/in²

Sealing Method

Cushion-seated FEP diaphragm

Loading Method

Weight-loaded pallets

Nominal Sizes

2″, 3″, 4″, 6″, 8″, 10″, 12″

Flanged Connections

ANSI 125 / 150 Flat Face

Body and Seat

PVC

Pallets

PVC

Diaphragm

FEP

Screen

Polyethylene

Weights

Rubber-coated lead or 316 Stainless Steel

Hardware

316 Stainless Steel

Temperature Range

−20°F to +140°F

Sizing Basis

API 2000 (Shand & Jurs WinSize / EZ-Flow)

Standards

API 2000; ISO 9001

Options

Pressure-only, vacuum-only, or combined P/V; closed pipe-away configuration; 316 SS hardware; custom flange drilling

2026 COST ESTIMATE

Contact Support

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

Why choose PVC over metallic construction for a conservation vent?

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Metallic vents handling corrosive acids, toxic liquids, or oxidizing vapors are prone to pitting, coating failure, and premature replacement. PVC construction eliminates structural corrosion on the wetted interior, extending service life in aggressive chemical environments. The trade-off is a tighter operating temperature window (−20°F to +140°F) and lower maximum pressure than metallic vents.

What pressure and vacuum settings are available?

Standard pressure setting begins at 0.5 oz/in² and can go up to 8 oz/in² depending on configuration. Vacuum capability is available up to 4 oz/in². The 94050 can be supplied as pressure-only, vacuum-only, or combined P/V to match specific tank protection requirements.

How is relief capacity sized?

Capacity is sized per API 2000 using Shand & Jurs WinSize (EZ-Flow). Selection is based on anticipated flow rates and allowable pressure drops for the specific tank, so vent selection is defensible against the applicable code-of-construction and site safety program.

What are the temperature limits?

The 94050 is rated for −20°F to +140°F. For higher temperatures or more aggressive chemistry, Shand & Jurs FRP conservation vents such as the 9406X Series or the 94080 FRP Vacuum Vent extend the working range.

Can the vent be configured for pipe-away vapor recovery?

Yes. A closed pipe-away configuration is available that routes vapors to a recovery or treatment system rather than discharging to atmosphere, supporting closed-vent architectures on regulated chemical and wastewater sites.

What flange interfaces are supported?

Standard flange drilling is ANSI 125/150 flat face, matching atmospheric tank nozzle connections. Custom flange drilling is available for project-specific nozzle patterns.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 94050 PVC Conservation Vent is chosen when atmospheric storage tanks operate in aggressive chemical service where metallic vents corrode or fail prematurely. A fully non-metallic body, cushion-seated FEP diaphragm, and guided weight-loaded pallets deliver stable breathing performance and extended service life across acid, toxic, and wastewater tank applications. For aggressive-media storage, it is trusted wherever you need to measure, monitor, and protect what matters most.

94050 PVC Conservation Vent