Centralised or Individual Vacuum Pumps for a Food Packing Line?

At the end of a packing shift, one line may still be sealing poultry trays while another is being washed down and a third stands idle. In food packaging, that mixed operating state should decide between a centralised vacuum system and individual machine pumps, well before anyone compares headline pump capacity.

Centralisation often suits several machines with compatible pressure requirements, predictable simultaneous demand and shared maintenance arrangements. Individual pumps make more sense where lines need independent availability, different vacuum levels or strict process segregation.

Anglian Compressors, a Branch of Atlas Copco Compressors, assesses the machinery, product, hygiene zones and operating schedule before specifying the architecture.

Centralised Vacuum System or Individual Pumps: The Operating Trade-Off

A centralised system serves several packing machines from a common vacuum plant. An individual system places a dedicated pump at each machine or line.

Centralisation can reduce the number of operating pumps when line demand varies, and it moves heat, noise and routine maintenance away from the packing area. Sequenced pumps share demand, while standby capacity supports production during planned maintenance.

Individual pumps shorten the functional boundary around each machine. A fault, contaminated line or maintenance shutdown is less likely to affect neighbouring equipment, and each process can run at its own pressure.

Decision Factor	Centralised Vacuum System	Individual Vacuum Pumps
Demand profile	Strong fit where several machines have overlapping or variable cycles	Strong fit where each machine has a distinct, stable duty
Production resilience	Requires planned redundancy and effective branch isolation	A pump fault normally affects one line
Hygiene segregation	Shared infrastructure needs a documented contamination-control strategy	Separation between products and hygiene zones is clearer
Maintenance access	Pump service can take place outside the packing area	Maintenance occurs at each machine
Expansion	Spare capacity and connection strategy must be designed in	New lines can receive their own correctly sized pump
Distribution losses	Performance depends on the complete network	Less shared pipework, but more installed equipment

A hybrid also works. High-throughput lines may share a central plant while a specialist chamber machine, allergen-controlled area or low-pressure process retains its own pump.

Build the Duty Map From Real Packing Cycles

Catalogue flow at an undefined pressure is not enough. Record what every machine does during evacuation, sealing, venting, cleaning, product changeover and idle periods.

The duty schedule should capture:

• Chamber or package volume
• Required final chamber pressure at each machine, stated in mbar absolute (mbar(a))
• Maximum permitted evacuation time
• Cycles per minute and shift pattern
• Number of machines likely to evacuate simultaneously
• Product temperature, moisture and any particles, liquids or cleaning chemicals that may reach the system
• Planned line additions and seasonal production changes
• Required availability during pump maintenance or failure

State every pressure as absolute and record local atmospheric pressure alongside it. A “90% vacuum” figure or a gauge reading is referenced to atmospheric pressure, so it cannot be tested as a design specification.

These inputs set the operating points for comparing industrial vacuum pumps, and they expose loads that shouldn’t share a network.

Model the Worst Credible Simultaneous Cycle

Adding every machine’s maximum demand produces an oversized system if those peaks cannot occur together. Averaging the demand produces an undersized system if several chambers can evacuate at once.

Use the line controls, production schedule and cycle data to define the worst credible simultaneous cycle, then calculate pressure at each machine during that event. That calculation is the real test of whether a centralised design can hold every line within its cycle time.

Decide too what production must continue if one pump, valve or controller fails. A duty-and-standby arrangement may protect the plant-level supply, but it won’t compensate for a single unisolated branch fault.

Effective Pumping Speed at the Chamber Sets the Cycle Time

Cycle time is controlled by the effective pumping speed at the chamber, after pipe conductance losses. Catalogue displacement at the pump overstates what the machine receives, and a larger pump cannot overcome a restrictive header.

As an idealised illustration, a pump rated at 560 m³/h behind pipework with a conductance of 1,000 m³/h delivers about 359 m³/h at the chamber, before leaks and vapour are counted.

Short, large-bore, drainable headers suit a central plant. Long, narrow or highly branched routes can rule it out.

A vacuum network needs its own sizing calculation, but the verified routes, labelled isolation and documented tests of a compressed air pipework installation still apply. Fit measurement points at remote machines, because a reading beside the pump cannot prove the furthest chamber reaches its required pressure in time.

Match the Pump Technology to the Product

Oil-sealed rotary vane pumps are compact and suit many chamber-packaging duties, but their separators need regular attention and water or product carry-over degrades the oil. Dry claw and dry screw pumps keep oil out of the pumping chamber, which removes oil mist and odour from the contamination assessment in a food area. Many single-stage claw models cannot reach deep packaging pressures (our DZS dry claw range is published at 50 to 200 mbar(a)), while dry screw pumps go much deeper at higher capital cost.

Wet product changes the sizing. At 20°C, water’s saturation pressure is about 23.39 mbar absolute, so evacuating a wet or warm product towards that pressure releases vapour that flattens the pump-down curve, lengthens cycles and puts condensate into headers and oil. Specify product temperature and water-vapour handling, because a dry-air nameplate curve does not describe a warm, wet product.

Put Food Safety Ahead of Utility Design

Removing air changes the microbial environment, but it doesn’t replace temperature control, validated shelf-life or hazard analysis. Your HACCP study defines those controls, and the vacuum system has to support them.

For covered chilled vacuum-packed or modified atmosphere packed foods stored through the 3–8°C range, the Food Standards Agency uses a 10-day shelf-life decision point. Longer shelf-life needs additional controls, as the FSA vacuum-packaging guidance explains, and no pump setting changes that decision.

Where equipment contacts food, Annex II, Chapter V of Regulation (EC) No 852/2004 requires it to be cleanable and maintained to minimise contamination. Assess whether product liquid, particles, cleaning solution or condensate can enter the vacuum line, and whether a shared header could carry material from one line to another.

Our work supplying compressed air for the packaging industry follows the same principle of respecting each area’s hygiene classification. Where the vacuum circuit forms part of the product-contact boundary, the HACCP team and machinery designer decide whether centralisation gives acceptable separation.

Specify Pump Performance at the Operating Point

A tender stating “vacuum pump, ISO quality” gives procurement nothing it can test. Specify flow at defined absolute inlet pressures, acceptable evacuation time, power consumption at that operating point and the expected vapour load.

Require operating-point test data to ISO 21360-1 and ISO 21360-2:2020, which together cover volume flow, base pressure, water-vapour tolerance and power. Ask suppliers to declare their test conditions, because two flow values measured at different pressures cannot be compared.

Plan the Pump Room and Maintenance Access

A central pump room turns a machine purchase into a utility installation, with electrical supplies, ventilation, condensate handling and shutdown arrangements inside the system boundary. In return, pump servicing moves out of the packing area and away from washdown.

Individual pumps keep maintenance at each machine, which is simpler to plan but brings engineers into the hygiene zone. Where compressed air or nitrogen work runs at the same time, our compressed air system installation team can plan it alongside the vacuum plant under one set of shutdowns.

Commission Against Accepted Packs and Future Lines

Commissioning must test the connected system with representative products, packaging and production sequences. BS EN 415-11:2021 gives an acceptance-test method for packaging-machine efficiency and availability, used alongside separate safety checks.

Test absolute pressure and evacuation time at each active machine during the worst credible simultaneous cycle, then pack outcome, performance with one pump or branch unavailable and energy use. Energy per accepted pack is more useful than pump power alone. A lower-power arrangement that extends the cycle or increases rejects can cost more per saleable unit.

Before signing off a central plant, confirm the spare capacity and connection points reserved for planned lines. Adding a machine later changes the coincident demand and the pressure at every remote branch.

The Measurements We Need for a Quote

To compare both architectures against the same acceptance criteria, send our engineering team:

• Machine list with chamber or package volumes
• Cycles per minute for each machine
• Required evacuation time per cycle
• Required final absolute pressure at each machine, in mbar(a)
• Pipe run lengths and bores from the proposed plant position to each machine
• Product temperature and moisture, including marinades, fats or cleaning-fluid carry-over
• Operating hours and shift pattern, including washdown periods
• Planned future lines and seasonal peaks
• Site layout drawings, hygiene zone plans and the machine manufacturers’ vacuum specifications

Anglian Compressors supports food and packaging facilities across the East of England and surrounding regions. Send the list above through the form below and we will model the packing-line duty before the pump arrangement is fixed into the capital specification. If the same lines also run on compressed air, book a free energy audit and we will data-log that system for 7–10 days to show where air is being lost and what it costs per year.