The Hydrun HY-D degassing systems offer high tech solutions that work seamlessly across a wide range of heating and cooling applications.
Hydrun HY-D stops scale formation and water borne corrosion.
Programmable. When initially enabled, Hydrun HY-D continually degasses the system fluid for 30 days after which it automatically reverts to periodic maintenance degassing. All settings are adjustable to suit system conditions and operation is silent.
Commissioning. Hydrun HY-D takes seconds using its easy to navigate colour HMI panel. Once set, purge and maintenance degassing is fully automated.
Interface. Hydrun HY-D has audio & visual alarms plus an integrated Modbus interface allowing remote control and monitoring via a Building Management System.
Ideal for district heating, district cooling, energy networks, commercial HVAC.
A vacuum degasser is a specialized device designed to extract unwanted gases from liquids. By creating a controlled vacuum environment, it efficiently removes dissolved gases—such as oxygen and nitrogen—as well as entrained air and microbubbles. This process streamlines operations and ensures that liquid systems perform at their best.
A typical vacuum degassing system includes a powerful vacuum pump, automated controls, and precisely designed inlet and outlet pathways. By lowering the pressure inside the chamber, the degasser forces gas molecules to escape from the liquid, boosting efficiency and minimizing the risk of corrosion. Often called degassing units or machines, these systems support a wide array of industrial applications.
What is Dynamic Pressurisation
Traditional pressurisation utilises a pump which just turns on when the pressure is too low and then turns off when the pressure reaches the desired amount. Dynamic pressurisation stops and starts the pumps at varying speeds as and when needed, this has a number of benefits:-
1. It provides active, precise control over system pressure, ensuring efficiency, longevity, and safety compared to passive, static expansion tanks.
2. By maintaining a precise, optimal pressure, these units prevent fluctuations that can cause air ingress, pump cavitation, and overall system malfunction.
3. Dynamic units are significantly more efficient than standard units, (approx. 90% vs. 40%).
4. You don’t need a sealed pressure vessel, which saves money on ongoing tank inspections.
5. Pressure is held in the unit so a smaller open tank can be used, saving valuable space.
6. Reduces oxygen diffusion levels
Introducing the Hydrun HY-PD
The PD-X is a vacuum degasser and dynamic pressurisation unit in one small unit.
Find out more here
Introducing the Hydrun HY-P
Dynamic pressurisation unit
Find out more here
Vacuum degassing is a process used to remove dissolved gases and trapped air from liquids by reducing the surrounding pressure.
Core Mechanism: The fundamental principle behind vacuum degassing is Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to its partial pressure.
Pressure Reduction: A vacuum pump lowers the pressure inside a sealed chamber.
Decreased Solubility: As pressure drops, the liquid's ability to hold dissolved gases decreases.
Bubble Expansion: Trapped gases form bubbles that expand rapidly due to the reduced external pressure.
Release: These expanded bubbles become more buoyant, rise to the surface, and burst, allowing the vacuum pump to evacuate the released gas.
Common Applications
Manufacturing: Removes air from HVAC and industrial heating and cooling systems to prevent bubbles in finished molds and parts.
Water Treatment: Removes corrosive oxygen and acidic carbon dioxide from boiler feedwater to prevent pipe corrosion.
Food & Beverage: Deaerates liquids like sauces and juices to extend shelf life and control carbonation levels in drinks.
Without degassing, water systems are prone to accelerated physical deterioration and significant operational failures due to the presence of dissolved gases like oxygen (O2 and CO2 carbon dioxide). Key consequences for water systems include:
1. Equipment Corrosion and Material Failure
Oxidative Corrosion: Dissolved oxygen (O2) acts as an oxidizing agent, leading to the rapid formation of rust and pitting in metallic boilers, pipelines, and industrial components.
Acidic Damage: Dissolved carbon dioxide reacts with water to form carbonic acid, which lowers pH levels and aggressively attacks metal surfaces, particularly in steam and boiler systems.
Magnetite Sludge: In heating systems, oxygen entry leads to the formation of magnetite sludge, which can clog pipes and damage sensitive components even before full corrosion occurs.
2. Operational Inefficiency and Noise
Heating and Cooling Loss: In hydronic (HVAC) systems, air pockets prevent radiators from heating up fully and disrupt hydraulic adjustments, leading to cold spots and uneven temperature distribution.
Mechanical Noise: Trapped air causes audible "gurgling" or banging in radiators and piping.
Pump Cavitation: Dissolved gases can form bubbles that cause pump cavitation, leading to erratic flow rates, mechanical wear, and potential pump failure.