Pressure expansion vessel, 18 l, 8 bar, 1"

Product detailed description

Pressure expansion vessels are essential components in closed water systems where thermal expansion must be accommodated. They are commonly used in domestic and commercial heating systems, including hot water storage units and boiler circuits. These vessels help stabilise pressure and prevent damage caused by thermal expansion. Installers and technicians working on water systems must ensure correct sizing and installation to maintain system integrity and safety.

Technical parameters

Diameter	270 mm
EAN	8019742012037
Weight	3.7 kg
Code	A012J24
Brand	IVAR

The 18 l capacity and 8 bar pressure rating make this vessel suitable for systems with moderate expansion requirements. The 1 inch connection size is standard for many domestic and light commercial applications. The operating temperature range from -10 °C to +99 °C allows use in a wide range of environments, although the recommended operating temperature is up to +80 °C.

Installation and connection

During installation, the vessel should be mounted in a vertical position for proper operation. The 1 inch connection requires a compatible pipe thread, typically a male thread on the vessel. Installers must ensure the vessel is connected to the system at a point where expansion can be effectively managed, typically after the pump and before the boiler or storage unit. A pressure gauge and safety valve should also be installed in the system to monitor and control pressure. Common installation mistakes include incorrect orientation, improper sealing at the connection point and failure to check the pre-charge pressure before commissioning.

Compatibility and accessories

This vessel is compatible with most closed water systems operating within the specified pressure and temperature ranges. It is typically used in conjunction with pressure-reducing valves, safety valves and pressure gauges. No additional accessories are required for basic installation, but system-specific components may be necessary depending on the application. Installers should ensure all components are compatible with the vessel's specifications and the overall system design.

Technical background for designers

The vessel operates on the principle of a flexible membrane separating the air and water chambers. The EPDM membrane is designed to withstand repeated expansion and contraction cycles without degradation. The vessel is constructed from materials that resist corrosion and maintain structural integrity under pressure. The system integration requires careful consideration of the expansion volume, which is determined by the system's water capacity and the expected temperature range. The vessel's service life and efficiency are influenced by the quality of the installation, the stability of the system pressure and the operating temperature.

Service and operation

Routine service involves checking the pre-charge pressure and inspecting the vessel for signs of wear or damage. The EPDM membrane should be replaced if it shows signs of deterioration. No specific service intervals are provided, but regular monitoring is recommended to ensure continued performance. During operation, the vessel should be monitored for pressure fluctuations and any unusual noise or vibration that may indicate a problem.

Frequently asked questions

Can the IVAR AC 18 AQUACOLD be used in a domestic hot water system?
Yes, the vessel is suitable for domestic hot water systems operating within the specified pressure and temperature ranges.

What is the recommended operating temperature for the vessel?
The recommended operating temperature is up to +80 °C, although the vessel can operate in environments up to +99 °C.

Is the vessel suitable for use with a gas boiler?
Yes, the vessel is compatible with gas boilers provided the system pressure and temperature are within the vessel's specifications.

What should be done if the vessel shows signs of wear?
If the EPDM membrane shows signs of deterioration, it should be replaced to maintain the vessel's performance and prevent system damage.