Pressure Relief & Venting Solutions

Inventory Control
01

Introduction

Pressure Relief & Venting Solutions

What Kind of Pressure Relief and Venting Solutions Do We Offer?

We provide a full suite of engineered tank “breathing” equipment under the Shand & Jurs and Varec brands. These devices protect storage tanks from dangerous pressure and vacuum conditions during normal and emergency operations.

Emergency Vents

Example: Shand & Jurs 94210

  • Large-diameter relief hatches
  • Open only during fire conditions or extreme overpressure events
  • Prevent catastrophic tank rupture

Pilot-Operated Relief Valves
  • High precision
  • Operate very close to the tank's MAWP
  • Provide tight sealing and minimal leakage

Gauge Hatches

  • Provide manual tank access
  • Offer limited pressure relief
  • Often used on fixed-roof tanks for sampling or inspection
Shand & Jurs 94020

Conservation Vents (Pressure/Vacuum Vents)

Examples: Shand & Jurs 94020, Varec 2010/2020

  • Manage normal tank breathing
  • Prevent vacuum damage during pump out
  • Minimize pressure buildup during filling or thermal expansion
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Where Are These Solutions Used?

These products are essential for atmospheric and low pressure storage tanks across multiple industries.

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Key Applications

  • API 650 / API 620 tanks
  • Oil refineries and chemical processing
  • Bulk liquid terminals
  • Wastewater digesters
  • Food & industrial liquids
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Typical Products

Installed on fixed roof tanks to prevent structural damage.

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Services Provided

  • VR-certified valve repair & testing
  • Set-point verification
  • Leak-rate testing
  • Cleaning & repair of pallet assemblies
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Why Are Pressure Relief & Venting Solutions Essential?

Storage tanks are not pressure vessels—they are thin-walled and vulnerable to collapse or rupture.

Structural Integrity

Without proper venting:

  • Vacuum collapse can occur during pump-out
  • Roof blow-off can occur during filling
  • Thermal expansion from sunlight alone can overstress the tank

Emission Control (Environmental & Cost Savings)

  • Open vents release valuable product and create odors
  • Conservation vents seal tightly until pressure reaches a controlled set point
  • Minimizes emissions and product loss

Fire Safety

In a fire:

  • The liquid inside boils, rapidly increasing vapor pressure
  • Emergency Vents provide a massive relief area to prevent tank explosion

Introduction to Pressure Relief & Venting

Every storage tank must be able to breathe. Daily temperature swings, tank filling operations, and pump-out cycles all cause internal pressure to rise and fall. Pressure Relief and Venting Solutions act as the “lungs” of your tank farm—allowing vapor to escape or air to enter only when necessary.

Cognesense offers industry-leading Shand & Jurs and Varec conservation vents, emergency vents, and relief valves. These precision-engineered devices maintain tank integrity, reduce emissions, safeguard personnel, and extend equipment life.

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How It Works & Key Advantages

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The ExpandaSeal™ Advantage

Many vents leak as pressure approaches the set point. Shand & Jurs ExpandaSeal™ technology solves this by using internal pressure to tighten the seal:

  • Near zero leakage up to 95% of set point
  • Less lost product
  • Fewer odors, fewer emissions
  • Superior seal performance compared to conventional pallets
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Engineered for All Weather Conditions

Our technology includes:

  • FEP (Teflon) diaphragms for smooth pallet lift
  • Anti-stick coatings
  • Freeze-resistant designs
Perfect for:
  • Cold climates
  • Heavy crude vapors
  • High-moisture environments
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Emergency Over-Pressure Protection

In fire scenarios, pressure spikes rapidly. Emergency vents:

  • Open instantly
  • Provide huge relief capacity
  • Prevent catastrophic tank rupture
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Installation & Retrofit Considerations

Drop-In Compatibility
  • Standard ANSI 150# and API 650 flange patterns
  • Easy replacement for aging or non-compliant vents
  • No special adapters needed
Modular, Maintenance-Friendly Design
  • Pallet assemblies are removable
  • Clean or replace internals without removing the full housing
  • Reduces crane time and tank roof downtime
  • Saves labor and maintenance costs

Why Cognesense?

Cognesense carries forward the trusted legacy of Shand & Jurs, the pioneer of tank venting technology for over 90 years.

Our advantages:

  • Industry-best sealing performance
  • API 2000–compliant leak rates
  • Rugged, fieldproven construction
  • Expertise in sizing, selection, and compliance

We don’t just provide a vent. We provide peace of mind—your tank won’t implode, explode, or leak profits into the atmosphere.

Measure. Monitor. Protect.