The BSP Fireside Bronze Fusible Plug acts as a crucial safety device in boilers and similar systems. Its primary function is to melt at a specific temperature, allowing it to release built-up pressure. This mechanism prevents boiler or system failures, such as major explosions or accidents, by ensuring that pressure does not exceed safe limits during high-temperature or over-pressurized conditions.

 

This fusible plug is certified to Boiler Code Standard No AS 1732. It meets rigorous safety and performance requirements, ensuring reliable protection and compliance with industry regulations.

 

The fusible plug is designed to handle saturated steam pressures up to 1240 kPa (approximately 179 psi). For systems operating at pressures higher than 1240 kPa, it is recommended to use plugs with melting temperatures 21 to 65°C above the steam temperature to maintain an adequate safety margin.

 

The standard operating temperature for this fusible plug is 232°C (450°F). For applications requiring higher temperatures, custom options are available to meet specific system requirements.

 

This fusible plug is primarily designed for use with saturated steam. If your system operates with superheated steam or has specialized requirements, please consult with our technical support team to ensure compatibility and optimal performance.

 

Installation should follow the boiler manufacturer’s guidelines:

• Locate the designated fireside position as specified in the boiler manual.
• Thread the fusible plug into the designated spot using BSP threads.
• Seal the threads properly with thread tape or an approved sealant to ensure a secure and leak-free fit.
• Ensure the plug is tightly secured to function correctly as a safety device.

Proper installation is essential for the effective operation of the fusible plug.

 

 

To select the appropriate fusible plug:

• Determine your boiler’s operating pressure and temperature.
• Choose a fusible plug that matches or exceeds these specifications.
• For steam pressures above 1240 kPa, ensure the plug’s melting temperature is 21–65°C above the steam temperature to provide a sufficient safety margin.

Consult with our experts if you’re unsure about the best fit for your system.

 

 

Regular maintenance ensures the fusible plug functions correctly:

• Inspect the fusible plug during routine boiler maintenance.
• Check for signs of wear, corrosion, or melting.
• Replace the plug immediately if any damage or tampering is detected.
• Ensure the plug remains clean and free from obstructions to maintain its effectiveness.

Proper maintenance helps prevent potential system failures and ensures ongoing safety.

 

 

The fusible plug is constructed from:

• Bronze body: Provides durability and resistance to high temperatures and pressures.
• Tin insert: Serves as the fusible element that melts at the designated temperature to release pressure.

These materials are chosen for their reliability and performance in demanding environments.

 

 

Yes, we provide full material and compliance certificates upon request. Each fusible plug undergoes rigorous testing before leaving our facility to ensure it meets all safety and quality standards.

 

Delivery times vary based on your location and chosen shipping method:

• Express Freight: Typically arrives by the next business day for packages under 5 kg in metropolitan areas of Australia.
• Standard Road Freight: Usually takes 1–10 days, averaging around 3 days, depending on your specific location.

Please choose the shipping option that best suits your timeline needs.

 

 

Our fusible plugs come with a 12-month warranty. We implement strict quality controls and conduct pre-dispatch testing to minimize any issues. Additionally, our support team is available to assist you post-purchase, ensuring your satisfaction and peace of mind.

 

A typical fusible plug uses a tin alloy with a melting point of 232°C (450°F). This precise melting temperature ensures the plug activates at the correct moment to release pressure and prevent system failure.

 

Fusible plugs are commonly made from:

• Bronze
• Brass
• Gunmetal

These metals form the threaded cylinder, which includes a tapered hole sealed with a low-melting-point metal like tin. This design allows the plug to melt and release pressure when necessary.

 

 

Fusible metal plugs are often used in acetylene cylinders, specifically in devices like the CG-3. These plugs utilize an alloy with a melting point between 208°F and 220°F (98°C to 104°C), with a nominal melting temperature of 212°F (100°C). They serve as safety mechanisms to release pressure if the cylinder overheats.

 

Fusible plugs are essential safety components that:

• Maintain the plug’s metal temperature below its melting point under normal conditions.
• Act as fail-safe valves by melting and releasing pressure when abnormal or dangerous temperatures occur.
• Prevent overheating and potential explosions in closed vessels like boilers and cylinders.

Their low melting points make them ideal for high-temperature safety applications.

 

 

Using a conductor with a high melting point in a fuse wire would require excessive heat to melt and interrupt the circuit. This delay can lead to:

• Short circuits
• Fires
• Electrocution risks

Therefore, selecting a low melting point metal is crucial for the effective and timely operation of safety mechanisms.

 

 

Fusible plugs are designed to operate within specific temperature ranges based on their application:

• Historically used plugs operating at 100–110°C (212–230°F). However, due to environmental concerns related to refrigerant gas releases, these functions have largely been replaced by electrical switches.
• Typically operate at higher temperatures as specified by system requirements.

Always choose a fusible plug that matches the operational temperature range of your specific application.

 

 

A fusible plug is constructed from:

• Fusible Alloy (Tin Material): Acts as the temperature-sensitive element that melts to release pressure.
• Metal Body (Brass, Bronze, or Gunmetal): Forms a threaded, hollow cylinder with a tapered hole drilled completely through its length.

The low-melting-point metal seals the hole, ensuring it flows away only when the predetermined high temperature is reached, allowing pressure to escape safely.

 

 

Inside a fusible plug:

• Tapered Hole: Drilled completely through the length of the metal cylinder.
• Low-Melting-Point Metal (e.g., Tin): Seals the tapered hole and is designed to melt and flow away when exposed to high temperatures, enabling the plug to release pressure.

These materials ensure the plug functions reliably under specified conditions.

 

 

While both fusible plugs and rupture discs serve as safety devices to release pressure, they operate differently:

• Fusible Plugs:
  • Material-Based Activation: Made from metals that melt at specific temperatures.
  • Gradual Pressure Release: Activate when the temperature exceeds a set point, allowing pressure to be released gradually.
  • Used in Systems Requiring Temperature-Based Safety: Such as boilers and certain cylinders.
• Rupture Discs:
  • Membrane-Based Activation: Consist of a thin membrane designed to burst at a predetermined pressure.
  • Immediate Pressure Release: Provide a rapid and complete release of pressure once the burst occurs.
  • Used in Systems Requiring Pressure-Based Safety: Such as chemical processing and high-pressure storage systems.

Additionally, pressure relief valves can be adjusted to release pressure slowly, whereas rupture discs and fusible plugs typically operate once their specific thresholds are exceeded without adjustment.

If you have any further questions or need assistance in selecting the right fusible plug for your application, feel free to contact our support team. We're here to help ensure your systems operate safely and efficiently.