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Shand & Jurs 94080 FRP Vacuum Vent

FRP Vacuum Vent

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Shand & Jurs 94080 FRP Vacuum Vent

For chemical plant engineers, wastewater specifiers, and corrosion specialists, the Shand & Jurs 94080 FRP Vacuum Vent provides vacuum relief for atmospheric storage tanks handling corrosive or oxidizing vapors where metallic vents lose sealing accuracy due to material attack.

Unlike coated carbon steel or stainless vacuum vents that eventually corrode at the pallet seat and shift setpoint over time, the 94080 is constructed in one-piece fiberglass reinforced plastic (FRP) using Derakane or Furan resin, eliminating corrosion pathways that can change calibration through service life.

A weight-loaded pallet with diaphragm sealing opens between 0.5 and 8 oz/in² vacuum and reseats repeatably after each breathing cycle. The self-draining seat prevents condensate accumulation that could freeze or restrict pallet movement, maintaining stable vacuum protection through cold-weather and wet-vapor service.

Available in 2–12 in. sizes with ANSI 125/150 or EN PN10/16 flanges, the 94080 suits chemical, wastewater, and oxidizing liquid tanks where material compatibility governs long-term vent reliability more than pressure rating.

Shand & Jurs 94080 FRP Vacuum Vent
Shand & Jurs 94080 FRP Vacuum Vent
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Features

One-Piece FRP Housing

Molded FRP body eliminates corrosion leakage paths present in fabricated metal bodies, preserving calibration accuracy in aggressive oxidizing vapor environments.

Derakane or Furan Resin

Selectable vinyl ester or Furan resin construction maintains structural integrity in aggressive oxidizing vapors where standard resin systems degrade prematurely.

Self-Draining Seat

Sloped seating geometry drains condensate away from the pallet interface, preventing freeze-binding and maintaining operation in cold-weather or condensate-forming service.

Weight-Loaded Pallet

Weight-loaded pallet assembly delivers repeatable opening at low vacuum settings (0.5 to 8 oz/in²), providing controlled air admission during tank inbreathing events.

Encapsulated Lead Weights

FRP-encapsulated lead weights prevent material attack and contamination in highly corrosive vapor streams, preserving setpoint stability through extended service life.

Diaphragm Sealing Interface

FEP Teflon diaphragm limits continuous air ingress during normal operation, supporting stable resealing and preserving product quality during routine tank breathing.

Applications

  • Corrosive Chemical Storage: FRP construction extends vacuum-vent service life on chemical storage tanks where aggressive vapors attack metallic bodies and shift calibration over short service intervals.
  • Oxidizing Liquids: Derakane or Furan resin selection maintains structural integrity in oxidizing vapor service where standard metallic and coated vents degrade through chemical attack.
  • Wastewater Tanks: Resists hydrogen sulfide and acidic vapor attack on wastewater process and storage tanks, preserving vacuum protection where metallic vents fail in routine service.
  • Acid Service: Handles acid vapor environments where metallic vent bodies pit or lose coating integrity, extending inspection and replacement intervals on acid storage tanks.
  • Pump-Out Tanks: Controlled vacuum opening prevents tank shell distortion during pump-out operations that create rapid internal vacuum conditions on atmospheric storage vessels.
  • Thermal Contraction Service: Admits air during thermal contraction and rapid cooling events, preventing structural damage on atmospheric tanks exposed to wide temperature swings and cold weather.
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Specifications

Parameter

Specification

Device Type

FRP vacuum relief vent

Standard Setting

0.5 oz/in²

Adjustable Range

Up to 8 oz/in²

Nominal Sizes

2″ – 12″

Flanged Connections

ANSI 125/150 FF or EN1092-1 PN10/16

Sealing Method

Diaphragm-sealed pallet

Loading Method

Weight-loaded

Body

FRP (Derakane 470 / Derakane 411 / Furan)

Diaphragm

FEP Teflon

Weights

Encapsulated lead

Hardware

316 SS standard; Hastelloy C optional

Options

Derakane 470 / 411 / Furan body; Hastelloy C external hardware; EN PN16 flange drilling; polypropylene vacuum screen

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

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When should the 94080 be specified instead of a metallic vacuum vent?

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Metallic vacuum vents in acid, caustic, or oxidizer vapor service eventually corrode at the pallet seat, shifting setpoint and increasing leakage. The 94080 uses one-piece FRP construction that eliminates corrosion pathways, preserving calibration stability across long service intervals in aggressive vapor environments.

Which resin system should I specify?

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Derakane 470 is standard and resists most aggressive service. Derakane 411 extends chemical resistance for harsher conditions, and Furan is selected for maximum resistance in highly aggressive oxidizing or acidic vapor environments. Resin choice depends on the specific chemistry and operating temperature.

What is the vacuum setting range?

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Standard setting is 0.5 oz/in², adjustable up to 8 oz/in² depending on weight configuration. Consult the factory for specific setpoints at the boundaries of the range.

How does the self-draining seat design help?

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The seat and body are sloped so condensate drains away from the pallet interface rather than accumulating. This prevents freeze-binding in cold-weather service and limits condensate interference with reseating, preserving repeatable opening behavior across temperature cycles.

Are metric flange drilling patterns available?

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Yes. EN1092-1 PN10/16 flange drilling is available in addition to standard ANSI 125/150 flat face, matching European piping standards on international and petrochemical projects.

What hardware options are available for severe service?

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Standard hardware is 316 stainless steel. Hastelloy C external hardware is available for severe corrosion environments where 316 stainless itself is attacked by the surrounding vapor or splash.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 94080 FRP Vacuum Vent is chosen when atmospheric tanks handling corrosive or oxidizing vapors would shift calibration or fail in metallic construction. One-piece FRP construction, selectable Derakane or Furan resins, a self-draining seat, and encapsulated weights deliver repeatable low-vacuum protection and extended service life on chemical, wastewater, and acid-service tanks. For corrosion-driven vacuum protection, it is trusted wherever you need to measure, monitor, and protect what matters most.

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