Coolamon
A wooden carrying dish used in Aboriginal food, water and seed work. Western Desert examples are called piti or ngurti; the general term does not imply one uniform form or fermentation use.
Equipment · Industrial and laboratory plant
High-pressure processing vessel
A pressure-rated vessel holds food in water while a high-pressure system applies a controlled hydrostatic treatment. Food, packaging and process conditions determine the result; ordinary HPP does not sterilize every product.
A vessel in a pressure-processing system
A high-pressure processing vessel is the pressure-bearing chamber at the centre of an HPP system. In batch processing, packaged food is placed inside the chamber, which is filled with water. A pressure system raises the water pressure, holds it for a defined period, then releases it so the chamber can be unloaded. Water transmits the pressure to the package and its contents. Because the treatment is isostatic, pressure is applied throughout the product rather than from one pressing face; the product's shape is not the same kind of barrier it would be under a mechanical press.
The linked photograph records one small research unit at Food Science Australia: its caption identifies a two-litre HPP machine, and the image shows a horizontal metal chamber with a gauge. It is a useful example of a vessel and loading stage, not a template for all production machines. This page does not assign a universal capacity, dimension, alloy or closure design. Commercial systems, pilot units and laboratory apparatus differ, and a photograph does not reveal their internal pressure rating or safeguards.
What the pressure cycle does
EFSA describes high-pressure treatment as a non-thermal process used to reduce vegetative microorganisms in foods. The pressure and hold time are chosen for the product and target outcome; water activity, acidity, food composition and the microorganism can change the result. The processing cycle includes compression, a hold at target conditions and decompression. A chamber is therefore only one part of a validated system: the pump or intensifier, pressure controls, temperature conditions, packaging, loading pattern and product formulation all matter.
Batch HPP is commonly used for products already sealed in flexible packages, helping avoid recontamination from handling after treatment. The equipment can also treat liquid products using continuous or semi-continuous arrangements, but those systems handle the product differently. A vessel photograph should not lead readers to assume every HPP process uses the same package, pressure cycle or vessel layout.
Food safety and practical limits
Pressure treatment can reduce pathogens and spoilage organisms while retaining some qualities that heat may change, but it is not sterilisation by default. Bacterial spores are more pressure resistant than vegetative cells; ordinary non-thermal HPP does not reliably destroy them. Many treated foods still depend on refrigeration, acidity or another validated preservation barrier. EFSA also stresses that efficacy varies with both the food and the intended microbial target. Results from one product cannot be carried over to another just because both fit in the chamber.
The figures sometimes used to describe HPP are not a home processing instruction. A food business must validate the pressure and time for its own product, packaging and safety target, and maintain a process that delivers those conditions. This entry records equipment form and function; it does not provide an operating recipe, certify a machine, or replace the manufacturer's safety and maintenance instructions.
Sources for this section
Equipment details
PowerNot established The cited sources do not specify the power source or drive design of one standard vessel.
How you get oneNot established The cited sources describe industrial and research plant but do not document a general purchase or construction route.
CareThe cited sources do not establish a common maintenance schedule or cleaning procedure across HPP vessel models; follow the validated equipment manufacturer's instructions.
Made of
- Metal pressure chamber — Contains the pressure-transmitting fluid and product during treatment
A horizontal metal chamber is visible in the documented Food Science Australia unit; the photograph does not identify its alloy or construction standard. - Water — Pressure-transmitting fluid in commercial HPP systems
EFSA's assessment describes water as the pressure-transmitting fluid in current commercial systems.
Risks and precautions · Elevated risk
Pressure-vessel rupture or fluid release
HPP chambers operate under very high hydrostatic pressure. A vessel failure can release stored energy as a blast; the generic pressure-vessel guidance does not assess any specific HPP model.
Hazard sourceInstallation, commissioning and maintenance should be performed by suitably skilled persons according to the manufacturer's specifications.
Control sourceThis page does not provide operating settings, pressure ratings, service intervals or opening procedures. Use the exact equipment manufacturer's documentation and facility procedures; it is not an operating manual.
Limits
HPP efficacy depends on the food matrix, target organism and validated pressure/time conditions. A vessel does not supply a universal treatment recipe.
Source →Ordinary non-thermal HPP does not reliably inactivate bacterial spores. HPP-treated foods may require other preservation barriers such as refrigeration or acidity.
Source →Places
Australia
Documented use · Country evidenceThe image documents a two-litre unit at Food Science Australia. This is one research-scale example, not the origin of HPP or a claim that all HPP equipment is Australian.
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Sources
EFSA JournalEquipment operation · Food safety · Process limits
The efficacy and safety of high-pressure processing of foodHPP applies isostatic pressure; food and organism characteristics, pressure and holding time affect microbial reduction.
Commercial systems use water as the pressure-transmitting fluid; products are commonly pre-packed before treatment.
The assessment distinguishes food-specific outcomes and process conditions; it does not establish one universally valid treatment.
Cited in: What the pressure cycle does; Food safety and practical limits
Virginia Cooperative Extension, Virginia TechEquipment form · Operating cycle
How is High Pressure Processing Used to Process Foods?Batch HPP places packaged products in a water-filled vessel, then holds and releases the pressure.
The extension distinguishes batch processing of packaged solids from continuous or semi-continuous treatment of flowing liquids.
Cited in: A vessel in a pressure-processing system; What the pressure cycle does
Wikimedia Commons; original source CSIRO ScienceImageGeography · Equipment form · Visual reference
CSIRO ScienceImage 2672: Loading bottles into the high-pressure processing unitThe image caption identifies a two-litre high-pressure processing unit at Food Science Australia and dates the photograph to 22 March 2006.
The visible unit has a horizontal metal chamber and pressure gauge; its exact alloy and internal specifications are not stated.
The file page licenses the photograph under Creative Commons Attribution 3.0 Unported.
Cited in: A vessel in a pressure-processing system
U.S. Occupational Safety and Health AdministrationPressure system hazard
Pressure Vessels — Hazard RecognitionOSHA describes blast effects from sudden expansion of pressurized fluid after pressure-vessel rupture. This generic hazard supports caution, not a model-specific risk assessment.
New Zealand Ministry for Primary IndustriesEquipment safety · Installation and maintenance
Guidance document on further processing: high-pressure processingThe HPP guidance says equipment should be installed, commissioned and maintained by suitably skilled persons according to the manufacturer's specifications.