Often even straightforward problems are overlooked during design, installation, and maintenance. As a result, the system fluid’s quality is seriously compromised, and a potentially fatal series of events will occur. This dramatically reduces the efficiency of the system and causes premature failure of major system components.

Often it ends up in high operating costs for the plant and considerable expense for the owner and annoying inconveniences for the end-user. Parts need to be replaced, and the system must be cleaned persistently, and time and again, chemicals are applied. All this to achieve a “status quo” for the circulating fluid.

Break the cycle of work and costs

Breaking the cycle of work and costs starts with the pressurization system. A poorly designed, installed and maintained pressurization system can lead to negative pressures around the circuit. Air can be drawn in through automatic air vents, gaskets and micro leaks.

High pressure situations can lead to water being emitted through the safety valves and the subsequent frequent addition of further raw refill water. The introduction of fresh oxygen-rich water depletes any level of corrosion inhibitors that may be present. The onset of corrosion is then inevitable, and the cycle continues:

  • Air continually gets into the system.
  • Corrosion starts to occur.
  • Dirt & sludge begin to build-up.
  • The system is cleaned and treated.

Corrosion inhibitors do not affect the content of inert gases such as nitrogen and carbon dioxide that are present in large volumes and reduce the operating efficiency of the system.

SpiroExpand - Pressurisation assortment

A full range of solutions

Each heating or cooling system puts different demands on a pressure control system. Also, operators place additional requirements on the equipment of the pressure control systems, on the possible signal exchange with other parts of the installation or control system and operational reliability.

SpiroExpand covers a full range of solutions, from the most basic setup to the most complicated system. If you can’t find the right plan for you, we’ll be happy to create a customised set up specifically for your problem.

Using a pressurization unit means optimized pressure in your system
and saving space in your boiler room!

Our range of pressurisation units for residential and commercial projects

SpiroPress Expansion Tanks

Expansion vessels

These are ‘passive’ pressure management systems. A preset gas pressure in the membrane expansion vessel is used for pressure control. Because membrane expansion vessels do not have a make-up function, we ideally combine this type of pressure control with a vacuum degasser including a make-up function.

The expansion tanks are available in 12 configurations and with volumes between 2 -3000 litre and an operational pressure range from 3.0 – 25 bar.

Pressure vessels with fixed gas filling

New: SpiroExpand Top Up unit

The SpiroExpand MB0650 is a top up pressurisation unit with a flow rate (up to 18.5 l/min max @1bar) and a 5 litre internal category 5 (AB air gap) break tank.

Available as a single pump configuration. With electronic pressure transducer and user-friendly microprocessor for use on sealed systems in order to provide a minimum system pressure requirement.

The unit is easy to install and commission and housed in a compact, enclosed unit, making it suitable for wall mounting.

Ideal for small commercial or large domestic applications.

More about the SpiroExpand Top Up unit

SpiroExpand Top Up unit
SpiroExpand PicoControl Kompakt

SpiroExpand PicoControl Kompakt

The PicoControl Kompakt comes in six possible versions (45, 75, 125, 200, 300 or 500 liters). Operating pressure up to 4.0 bar is possible

  • Maximum safety temperature in the system: 110°C (with auxiliary tank)
  • The maximum temperature at the point of connection: 70°C
  • Maximum operating pressure (PN): 4 bar

The SpiroExpand PicoControl Kompakt is equipped with a single pump (1x 100%) and a single valve (1x 100%)

More about the PicoControl Kompakt

SpiroExpand MultiControl Kompakt

The Multicontrol Kompakt comes in 104 possible versions, with 5 possible container volumes: 75, 125, 200, 300 or 500 liters. Two further containers can be added.

  • Operational pressure range: 1.0 – 8.1 bar
  • Maximum expansion volume: 75 – 1,500 litres
  • Maximum thermal output: 450 – 2,500 kW
  • The maximum temperature at the point of connection: 70°C (over 70°C possible with auxiliary tank)
  • Maximum safety temperature in the system: 110°C
  • Maximum operating pressure (PN): 10 bar
SpiroExpand MultiControl Kompakt

Our Multicontrol Kompakt comes in 5 series and several Partner packages with the following configurations:

  1. MultiControl Kompact – SOLO, Single pump 1 x 100 %, Single valve 1 x 100 %
  2. MultiControl Kompact – DUO, Double pump 2 x 50 %, Single valve 1 x 100 %
  3. MultiControl Kompact – DUO / TWIN, Double pump 2 x 50 %, Double valve 2 x 100 %
  4. MultiControl Kompact – MAXI, Double pump 2 x 100 %, Single valve 1 x 100 %
  5. MultiControl Kompact – MAXI / TWIN, Double pump 2 x 100 %, Double valve 2 x 100 %
  6. MultiControl Kompact – Partner packages

More about the MultiControl Kompakt

Download the free BIM files of our MultiControl Kompakt products

SpiroExpand MultiControl Modular

The MultiControl Modular comes in 78 versions and 12 vessel volumes: 200 to 10,000 litres. Additional vessels can be added.

  • Operational pressure range: 1.0 – 16 bar
  • Pressure rating: PN10, PN16, PN25
  • Maximum expansion volume: 200 – 50,000 litres
  • Maximum thermal output: 450 – 100,000 kW
  • The maximum temperature at the point of connection: 70°C (over 70°C with auxiliary tank)
  • Maximum safety temperature in the system: 110°C
SpiroExpand MultiControl Modular

Our Multicontrol Modular comes in 5 series with the following configurations:

  1. MultiControl Modular – SOLO, Single pump 1 x100 %, Single valve 1 x 100 %
  2. MultiControl Modular – DUO, Double pump 2 x 50 %, Single valve 1 x 100 %
  3. MultiControl Modular – DUO / TWIN, Double pump 2 x 50 %, Double valve 2 x 100 %
  4. MultiControl Modular – MAXI, Double pump 2 x 100 %, Single valve 1 x 100 %
  5. MultiControl Modular – MAXI / TWIN. Double pump 2 x 100 %. Double valve 2 x 100 %

More about the MultiControl Modular

SpiroExpand MultoControl Cool

SpiroExpand MultiControl Cool

The MultiControl Cool is available in 6 configurations and 8 versions with volumes of 125 (x2), 200 (x2), 300 (x2) and 500 (2x) liters.

  • Operational pressure range: 1.0 – 5.6 bar
  • The minimum temperature at the point of connection: -10°C
  • Maximum safety temperature in the system: 110°C
  • The maximum temperature at the point of connection: 70°C
  • Maximum operating pressure (PN): 10 bar
  • Stainless steel containers with volumes between 125 -1000 liter
  • Corrosion-resistant materials used
  • Refill option can be added

More about the MultiControl COOL

SpiroExpand TopControl Modular

The TopControl Modular is an expansion- and pressure maintenance unit in modular design for combination with the pressureless EG expansion vessels (0,5 bar safety valve).

  • Maximum operating pressure (PN): 23,5 bar
  • The TopControl is ready to be integrated in an on-site process control.
  • The connections for integrating into the system (expansion pipe, make-up) are foreseen at both sides of the device.
  • The self supporting construction and the housing a minimal sound transmission is ensured.
SpiroExpand TopControl

Our TopControl Modular comes in 5 series with the following configurations:

  1. TopControl Modular – SOLO, Single pump 1 x 100 %, Single valve 1 x 100 %
  2. TopControl Modular – DUO, Double pump 2 x 50 %, Single valve 1 x 100 %
  3. TopControl Modular – DUO / TWIN, Double pump 2 x 50 %, Double valve 2 x 100 %
  4. TopControl Modular – MAXI, Double pump 2 x 100 %, Single valve 1 x 100 %
  5. TopControl Modular – MAXI / TWIN, Double pump 2 x 100 %, Double valve 2 x 100 %

Our TopControl Modular assortment

SpiroExpand Configuration Software

Customise your pressurisation set-up to maximise the performance of your heating or cooling system. Whether you are designing, dimensioning or planning as part of an initial consultation, this tool will help you, just enter the key basic parameters and you’ll be presented with various solutions in a matter of minutes. The preferred solution can be either downloaded or sent via email.

Start the SpiroExpand selection tool

A vacuum degasser is necessary to meet VDI standard

When degassing, we recommend following the VDI 4708 and VDI 2035-2 guidelines. In order to achieve the best possible degassing performance in heating and cooling installations, a separate vacuum degasser is necessary in addition to often used deaeration function in pressurisation systems’.

The degassing function available with many pressurisation systems, will reduce air related issues in closed water circuits, but they cannot guarantee to reach a gas pressure which is lower than the lowest pressure in the system (gas absorption condition). This means a vacuum degasser such as the Spirotech Superior is necessary to meet the VDI guidelines for degassing and deaeration, and for prevention of damage in water heating installations.

More information on vacuum and pressure step degassing

Our assortment vacuum degassers

Spirotech SpiroVent Superiors vacuüimontgassers

Connection diagrams of the SpiroExpand with the SpiroVent Superior

In the document below you find 2 connection diagrams with the SpiroExpand MultiControl Kompakt Solo in combination with our vacuum degassers:

  • SpiroVent Superior S400 and
  • SpiroVent Superior S600

A SpiroTrap dirt separator with magnet is also added to the connection diagram to ensure that your system water will be free from dirt and magnetite at any time.

Download the connection diagrams