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Shand & Jurs 9406X Series FRP Conservation Vent

FRP Conservation Vent

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Shand & Jurs 9406X Series FRP Conservation Vent

For chemical plant engineers, petrochemical specifiers, and wastewater designers, the Shand & Jurs 9406X Series provides pressure and vacuum relief for atmospheric and low-pressure storage tanks in corrosive or oxidizing environments where metallic vent bodies degrade.

Unlike coated carbon steel or stainless vents that eventually pit or lose coating integrity in acid and oxidizer service, the 9406X is constructed in fiberglass reinforced plastic (FRP) with vinyl ester resin systems, including Derakane 470 standard and Derakane 411 or Furan for more aggressive service such as concentrated hydrochloric acid.

Weighted pressure and vacuum pallets open and reseat as tank pressure fluctuates, maintaining internal conditions within design limits during thermal breathing. Sloped molded geometry drains condensate away from seating surfaces. Relief is sized per API 2000 using WinSize (EZ-Flow).

Three models cover discharge strategy: 94060 open/pipe-away/P-only/V-only, 94070 closed vent with outlet larger than inlet, and 94071 closed vent with equal-size outlet and inlet — aligning the vent with atmospheric release or remote vapor handling on acid, caustic, and wastewater tanks.

Shand & Jurs 94060
Shand & Jurs 9406X Series FRP Conservation Vent
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Features

FRP Vinyl Ester Construction

Vinyl ester FRP laminate resists oxidizing corrosion that compromises metallic vent bodies, extending service life in aggressive acid, caustic, and oxidizer vapor environments.

Selectable Resin Systems

Derakane 470 standard; Derakane 411 and Furan available for more aggressive chemical service including concentrated acids where standard vinyl ester is insufficient.

Weight-Loaded Pallets

Pressure and vacuum pallets provide controlled low-pressure relief at standard 0.5 oz/in² settings, maintaining predictable tank breathing through thermal cycling events.

Self-Draining Housing

Sloped internal surfaces drain condensate away from sealing interfaces, minimizing condensate interference with reseating performance during wet vapor and cold-weather service.

One-Piece Molded Body

Eliminates body joint leakage paths common in multi-piece metallic vent assemblies, reducing failure modes in aggressive corrosive vapor streams.

Three Discharge Configurations

94060 open/pipe-away/P-only/V-only, 94070 closed outlet > inlet, and 94071 closed equal-size align venting with atmospheric, pipe-away, or recovery strategies.

Applications

  • Acid Storage Tanks: FRP construction with selectable resin resists attack from concentrated acids including hydrochloric, supporting extended vent life on acid storage where metallic vents fail quickly.
  • Caustic Service Tanks: Vinyl ester resin resists caustic vapor attack, preserving sealing surfaces and setpoint stability on sodium hydroxide and related caustic storage applications.
  • Oxidizing Chemical Storage: Derakane 470 standard and Furan-option resins are selected for oxidizing service where metallic vents or coatings degrade rapidly through chemical and thermal exposure.
  • Wastewater Treatment Tanks: Suits aggressive wastewater process and storage tanks where hydrogen sulfide and acidic vapors degrade carbon steel and stainless vents during routine operation.
  • Corrosive Vapor Systems: Pipe-away closed configuration allows routing of aggressive vapors to scrubbers or treatment systems instead of atmospheric release, supporting compliance with site programs.
  • Petrochemical Process Tanks: Provides atmospheric pressure and vacuum relief on petrochemical tanks containing aggressive feedstocks or intermediates outside the range of standard metallic conservation vents.
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Specifications

Parameter

Specification

Device Type

FRP conservation vent (pressure and vacuum)

Models

94060 (open / pipe-away / P-only / V-only), 94070 (closed, outlet > inlet), 94071 (closed, equal size)

Standard Set Pressure

0.5 oz/in² (pressure and vacuum)

Adjustable Range

Selectable LOW / MED / HIGH bands per weight configuration

Maximum Pressure / Vacuum

Up to 12 oz/in² pressure, 8 oz/in² vacuum; size- and configuration-dependent

Leakage Performance

Standard air-groove pallet: <1 SCFH air at 90% of setpoint

Sealing Method

Weight-loaded pallets with FEP diaphragm

Loading Method

Gravity / weight loading

Nominal Sizes

2″, 3″, 4″, 6″, 8″, 10″, 12″; 16″, 20″, 24″ pressure-only (94060)

Flanged Connections

ANSI 125/150 FF; EN1092-1 PN10/16 FF; API 650 FF (94060)

Body

FRP — Derakane 470 vinyl ester (standard); Derakane 411 and Furan available

Pallets

FRP

Diaphragm

FEP

Hardware

316 Stainless Steel (Hastelloy C optional)

Weights

Resin-coated lead; FRP-encapsulated option available

Temperature Range

Typically −20°F to 200°F (−29°C to 93°C), dependent on resin and service

Sizing Basis

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

Approvals

Available per project requirement

Options

Open or closed (pipe-away); resin selection (470/411/Furan); 316 SS or Hastelloy C hardware; encapsulated weights; polypropylene vacuum screen; HEPA inlet filter

Contact Support
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Contact Support

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

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When should I choose FRP over PVC or metallic construction?

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FRP extends the corrosion resistance of non-metallic construction while supporting higher temperature and pressure than PVC. The 94050 PVC vent is typically limited to −20°F to +140°F; the 9406X FRP Series typically covers −20°F to +200°F depending on resin. Metallic vents remain the right choice outside aggressive chemistry or where temperature or pressure exceeds FRP limits.

Which resin system should I specify?

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Derakane 470 vinyl ester is standard and handles a wide range of aggressive service. Derakane 411 and Furan are available for more aggressive chemical service, including concentrated hydrochloric acid. Selection depends on the specific stored chemistry and operating temperature; consult the factory for borderline service.

What discharge configurations are available?

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The 94060 is available in open, pipe-away, pressure-only, and vacuum-only configurations. The 94070 is a closed vent with outlet larger than inlet, used for piped vapor routing. The 94071 is a closed vent with equal-size outlet and inlet for direct piping where downstream sizing matches.

How is relief capacity sized?

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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 choice is defensible against the applicable code-of-construction and site safety program.

Are larger sizes available for low-pressure applications?

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Yes. The 94060 pressure-only variant is available in 16″, 20″, and 24″ sizes, supporting larger tanks in chemical and wastewater service. Flange drilling includes API 650 patterns to match tank-specification nozzle layouts.

How does the self-draining housing help?

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Molded internal geometry slopes condensate away from sealing surfaces, minimizing condensate accumulation that can freeze, bind, or restrict pallet movement. This preserves reseating performance during wet-vapor and cold-weather service where condensate would otherwise compromise seal integrity.

What hazardous area approvals are available?

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Approvals are available per project requirement. The 9406X itself is a non-metallic device; approvals for specific installations should be confirmed at order entry against the datasheet-listed options.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 9406X Series FRP Conservation Vent is chosen when atmospheric and low-pressure tanks store aggressive chemistries that degrade metallic vents. Vinyl ester FRP construction, selectable resin systems, weight-loaded pallets, and one-piece molded housings deliver predictable breathing performance and extended service life across acid, caustic, oxidizing, and wastewater tank applications. For corrosion-driven storage programs, it is trusted wherever you need to measure, monitor, and protect what matters most.

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