B400 Emergency Pressure/Vacuum Relief
B400 Emergency Relief Manway Overview
The B400 Series ensures that tanks and vessels are kept safe during periods of excessive pressure due to external fire sources and also allows access to the tank for inspection and cleaning purposes. As the official 3B Controls representative for Western Canada, ZIRCO provides these essential safety devices to oil and gas operations throughout Alberta and beyond.
Available in two primary configurations: weight-loaded pressure only (B400) and combined pressure/vacuum relief (B400 PV), these units are designed for reliable operation in demanding industrial environments where emergency pressure relief is critical for safety.
Key Benefits for Western Canada Operations:
- Hinged cover ensures automatic re-seat after activation
- Self-draining design prevents condensate accumulation
- Low leakage - less than 1 scfh at 90% of set pressure
- Multiple size options from 8" to 36"
- Factory tested and fully certified
Technical Specifications
Pressure & Vacuum Settings
| Model Type | Pressure Settings | Vacuum Settings | Size Range |
|---|---|---|---|
| Weight Loaded Pressure Only | +4 mbarg to 140 mbarg | N/A | 8" (200 mm) – 36" (900 mm) |
| Weight Loaded Pressure / Spring Loaded Vacuum | +4 mbarg to 140 mbarg | -2 mbarg to -50 mbarg | 18" (450 mm) – 36" (900 mm) |
Construction Materials
| Component | Standard Options |
|---|---|
| Body Materials | Aluminium, Carbon Steel, Stainless Steel |
| Trim Material | Stainless Steel (standard) |
| Diaphragm Material | PTFE |
| Flanges | Drilled only - API / ANSI / DIN / JIS / Specials available |
Options & Accessories
| Option | Description |
|---|---|
| Hinged Cover | Ensures automatic re-seat after activation |
| Steam Jackets | For freeze protection and temperature maintenance |
| Proximity Switches | Indicate pallet lift for monitoring systems |
| Alternative Materials | Available for hazardous and corrosive applications |
Non-Standard Applications
For specialized applications beyond standard specifications, 3B Controls offers numerous custom options through consultation with their engineering team. These include:
- Exotic Materials: Hastelloy and various plastics suitable for hazardous environments
- Special Coatings: Applied for extreme service conditions
- Low Temperature Applications: Internal parts can be PTFE coated to prevent seizure in cold environments
* All products are subject to continuous development and 3B Controls reserves the right to change specifications without notification.
Product Features & Benefits
Low Cost Maintenance
Lightweight design provides easy handling whilst interchangeable components ensure standard parts are easily replaced. Minimizes downtime and maintenance costs for Western Canada operations.
Testing & Quality Assurance
All products are factory tested and fully certified to meet stringent industry standards. Ensures reliable performance when safety matters most.
Self Draining Design
All products are designed so that any condensate drains away from seating areas, preventing freeze damage and ensuring reliable operation in all weather conditions.
Low Leakage Rate
Standard seating design ensures minimum leakage of less than 1 scfh at 90% of set pressure. Protects product quality and reduces emissions.
Premium Internal Parts
Internal parts are stainless steel as standard. Non-standard materials available upon request for corrosive or hazardous applications common in oil and gas operations.
Flexible Connections
All valves are supplied with drilled flanges to meet individual requirements. API, ANSI, DIN, JIS, and special configurations available for global compatibility.
Product Literature & Resources
Technical Documents
Request for Quote
Request for Quote (RFQ) Form
Download and complete this form to submit your emergency relief valve requirements for quotation
Contact for More Information
ZIRCO is the authorized Western Canada representative for 3B Controls tank venting and safety products. Contact our team for:
- Technical specifications and sizing assistance
- Application engineering support
- Quotations and delivery information
- After-sales service and spare parts
Ensure Your Tank Safety with 3B Controls
Contact our team today to discuss how B400 Emergency Relief Manways can protect your storage tanks and vessels. ZIRCO provides expert support and authorized 3B Controls products for Western Canada oil and gas operations.