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A CIP system cleans defined internal product-contact surfaces by circulating water and cleaning media without routine dismantling. Reliable cleaning depends on the skid, pipe routes, tanks, valves, spray devices, return path, utilities, controls, and approved cleaning program working together.
Start the purchase specification by defining what must be cleaned, how each circuit reaches it, which conditions will be recorded, and who approves the result. These answers determine the tank arrangement and control scope.
A CIP unit with three tanks, connecting pipework and a control cabinet. Photo: Alps Machine
CIP means clean-in-place or cleaning-in-place. The system prepares or receives cleaning media, sends it through a selected circuit, monitors the required conditions, and returns or drains the liquid. A circuit may include process tanks, mixers, pasteurizers, pipelines, valves, and filler product paths.
A CIP connection does not prove full-line cleanability. The design must show that cleaning media reach the required surfaces, the return path works, trapped liquid can drain, equipment materials tolerate the program, and the cycle can be verified.
U.S. food rules require food-contact surfaces to be cleaned as frequently as necessary to prevent allergen cross-contact and contamination. The beverage producer remains responsible for the sanitation program and compliance in the destination market.
Source: Electronic Code of Federal Regulations, 21 CFR 117.35
Draw the process from ingredient and water preparation to filling. Mark the tanks, mixers, pumps, valves, pipelines, heat exchangers, pasteurizers, carbonators, filler product paths, return lines, hoses, and sample points that need CIP.
Process tanks and pipework to include when defining the cleaning boundary. Photo: Alps Machine
List external or removable items that need manual or clean-out-of-place methods. Guards, conveyors, cap hoppers, seamer areas, floors, and drains usually have separate sanitation procedures. A quotation that promises "full CIP" should state these boundaries.
Alps lists pasteurizing, carbonated beverage mixing, and UHT equipment in its beverage preparation range. When these systems share a project with the filler, assign responsibility for every cleaning connection and the integrated control logic.
Source: Alps beverage preparation systems
A circuit is the route used during one controlled cleaning cycle. Its design should reflect equipment geometry, product soil, hygiene zone, production schedule, and any need to clean several areas at once.
Plant condition | Practical approach | Main trade-off |
One simple line with long cleaning windows | One CIP source can serve sequential circuits | One circuit can delay the next |
Several lines or frequent changes | Independent circuits can reduce schedule conflicts | More valves, controls, utilities, and validation |
Different products or allergens | Separate routes or recovery rules may be needed | Higher cost versus cross-contact control |
Distant or elevated equipment | Review return flow and pressure losses | The farthest point may receive less cleaning action |
Aseptic or higher-hygiene process | Separate CIP and sterilization boundaries | Sterility needs its own equipment and validation basis |
EHEDG publishes separate guidance for CIP installation, cleaning validation, and tank cleaning. Its test-method note explains that equipment test results do not replace a cleaning regime developed for the actual process.
Sources: EHEDG guideline catalogue and EHEDG test methods
Cleaning media need enough contact time to remove the expected soil. Excess time increases downtime and can expose seals and surfaces to chemicals longer than necessary.
Temperature affects cleaning action, energy demand, heat loss, personnel risk, and material compatibility. Specify the required condition at both the controlling point in the circuit and the CIP tank outlet.
Cleaning agents must suit the residue, water quality, equipment materials, and local handling rules. The food-safety team and chemical supplier should approve the program. The machinery supplier should state equipment limits.
Pipelines need suitable circulation, while tanks need effective wetting from the selected spray device. Pump duty, pipe size, restrictions, return condition, and tank geometry must be assessed together. Extra pressure cannot correct a shadowed surface or stagnant branch.
Tetra Pak's CIP unit description shows tanks, heat exchangers, pumps, instruments, controls, and cleaning loops combined in one installation. The final configuration still depends on the plant's circuits and cleaning program.
Source: Tetra Pak CIP unit technical leaflet
Product group | Cleaning points to review |
Water and lightly flavored drinks | Water quality, mineral deposits, biofilm risk, flavor changeover, and filler design |
Carbonated soft drinks | Sweetener residue, flavor carryover, mixer and carbonator circuits, and filler product paths |
Juice and tea | Pulp, fiber, color, heat-affected deposits, strainers, heat exchangers, and recovery rules |
Dairy and plant-based drinks | Protein, fat, minerals, allergens, product-specific hygienic design, and validation |
Shared equipment may need carryover or allergen checks during changeover. Dairy and plant-based projects require specialist review and a product-specific cleaning program that is validated for the installed line.
Give every bidder the same cleaning basis:
1. Process diagram and equipment list. Identify each product-contact component and pipe route.
2. Product matrix. List residues, particles, allergens, colors, flavors, and planned production sequence.
3. Schedule. State batch lengths, changeovers, cleaning windows, and circuits that may run together.
4. Cleaning basis. Provide approved operating limits or name the party responsible for development and validation.
5. Water and utilities. State water quality, pressure, temperature, heating source, electricity, air, drainage, and wastewater constraints.
6. Recovery policy. Define which water or solutions can be recovered and how interfaces and rejected liquid are handled.
7. Controls and records. Specify routing, interlocks, alarms, access levels, calibration, manual steps, and data retention.
8. Materials and documents. Require material and seal information plus the certificates and fabrication records needed by the project.
9. Acceptance plan. Define FAT, site checks, validation ownership, sampling, pass or fail criteria, and revalidation triggers.
Single-use systems send cleaning media to drain. Recovery systems reuse selected water or solutions when the process allows it. Recovery adds tanks, interface detection, routing logic, monitoring, and contamination-control responsibilities.
Direct and indirect heating have different steam or electrical demand, control, installation, and maintenance needs. Compare peak demand during heat-up and circulation as well as average consumption.
A close-up of equipment pipework, a pump, valves and a pressure gauge. Photo: Alps Machine
Shared equipment needs clear routing logic and safe states after loss of air, power, flow, temperature, or communication. Specify each instrument's location, range, accuracy, calibration, alarm behavior, and record ownership.
Pipe slopes, low points, valve orientation, spray coverage, seals, and access affect drainage and inspection. Identify parts that require periodic dismantling even when routine cleaning is performed in place.
3-A SSI publishes sanitary standards for equipment including pumps, heat exchangers, fillers, and spray cleaning devices. Specify the standards, certificates, or construction evidence required for the destination and application.
Source: 3-A SSI standards catalogue
Use a line-by-line scope matrix. Check whether the price includes return pumps, heating, dosing, instruments, valve feedback, installation piping, insulation, commissioning, training, documentation, and validation support.
Each bidder should provide a process and instrumentation diagram, circuit list, design basis for the most demanding circuit, valve and instrument list, utility schedule, control narrative, manual-cleaning boundary, material list, responsibility split, and FAT/SAT scope.
FAT can verify construction, valve sequencing, instruments, alarms, recipe permissions, simulated routing, data records, and selected hydraulic functions. Water trials can reveal leaks, poor return, air binding, and control problems.
When FAT does not use the actual beverage or defined worst-case soil, validate product cleaning on the installed line. Site acceptance should confirm utilities, piping, drainage, chemical handling, return conditions, safety interlocks, records, and operator procedures. The plant's responsible team should approve the methods and pass or fail criteria.
Review validation after changes that can affect cleaning, including a new product or allergen, altered chemicals, pipe modifications, software changes, major maintenance, or an adverse hygiene trend.
Send bidders the cleaning boundary, circuit list, product soils, available cleaning window, utilities, responsibility matrix, and acceptance plan. Alps' beverage preparation equipment and contact page provide starting points for the equipment discussion. Confirm CIP coverage and validation responsibility in the project documents.
Tank count depends on the circuits, cleaning program, recovery policy, utilities, schedule, and validation needs. A three-tank or five-tank label does not establish suitability.
Yes, when circuits, materials, required conditions, return paths, timing, and hygiene boundaries are compatible. Separate circuits or programs may still be required.
No. CIP removes product soil and supports sanitation. Sterilization in place has a different objective and needs its own process, suitable equipment, controls, and validation.
The machinery supplier provides equipment limits and a proposed operating basis. The beverage producer's food-safety team, chemical supplier, and qualified specialists should approve and validate the final program.
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