Zilmet - Ultra Inox-Pro Horizontal Stainless Steel Expansion Vessel - 10 Bar. - 24Ltr

Zilmet - Ultra Inox-Pro Horizontal Stainless Steel Expansion Vessel - 10 Bar. - 24Ltr - ZI-1110002402

Operation Overview

The ULTRA INOX PRO range of Expansion Vessels is specifically designed for Unvented Potable Systems to deal with increased water volume resulting from heat expansion, solving issues of “hydraulic shock (water hammer)” phenomenon, or reducing number of pump operations or duration of pump run. The grade 304 stainless steel construction makes this vessel ideal for aggressive system installation environments (E.g. coastal areas) and areas where environmental hygiene is of paramount concern. The interchangeable membrane gives unparalleled longevity.

Operation overview for Heat Expansion Purposes

The purpose of these vessels is to accommodate the increased liquid volume which occurs during system heating in an Unvented Circuit. A pressurised membrane allows ingress/egress of the liquid during periods of heating / cooling thus providing space for the expanded fluid volume to reside and prevent system pressure increase.
The sensible contraction of system water volume during cooling periods is enabled by means of a compressed air cushion which returns this temporarily expanded volume to the system.

The correct size of vessel must be considered prior to system installation and installed and commissioned by appropriately trained engineers. Careful consideration of pre charge must also be made as this is dependant on the application of the vessel. The larger size range available as an option accommodates the larger systems and is also compatible with chilled water systems.

Operation overview for hydraulic shock (water hammer) (Shock) Arrester Purposes

Also known as Hydraulic Shock, hydraulic shock (water hammer) is a specific phenomenon and is not a “catch all” phrase for noisy pipe connections. The fitting of an ULTRA INOX PRO vessel will not resolve system noises where the root cause is excessive dynamic pressure, improperly clipped pipework system installation or pipe bore restrictions due to clogged filters, burrs on cut pipe or excessive “bushing down” of distribution pipework system installation.

Hydraulic shock (water hammer) is caused when a water supply outlet is closed very suddenly. This causes a change in the momentum of the water when the system suddenly goes from a lower running pressure to a higher static pressure. This momentum impacts against the now closed outlet resulting in a potentially loud banging noise. This is commonly found in “quarter turn” type tap outlets and washing machines with solenoids controlling flow.

Siting an ULTRA INOX PRO as close to the source of the noise as possible will cause the vessels diaphragm to flex in response to this momentum change and prevent the audible impact against the terminal fittings. The pre charge should ideally be set to just slightly above the dynamic pressure of the system it is fitted to.