A CIP system for food and beverage plants is designed around the soil, the production schedule and the cost of water and chemicals, which makes it a different machine from the pharmaceutical CIP skid that shares its name. Clean-in-place in a food plant has to remove fat, protein, sugar and mineral scale from tanks, lines, fillers and heat exchangers between products and at the end of every run, prove it did so to a sanitation program that FSMA and the customer audit, and do it fast enough that the line is back in production when the schedule says. Paul Industries designs, builds and installs CIP systems for food, beverage, dairy and snack plants, from single-circuit skids to multi-tank recovery systems serving a whole plant.
What a food-plant CIP cycle has to remove
| Soil | Where it comes from | What removes it |
|---|---|---|
| Fat and oil | Dairy, meat, fried and baked products, sauces | Hot caustic; emulsified and carried away |
| Protein | Dairy, meat, egg, plant protein; bakes onto heat transfer surfaces | Caustic with chlorinated or enzyme additives; temperature and time |
| Carbohydrate and sugar | Beverages, syrups, confectionery | Water and mild caustic; easiest soil |
| Mineral scale (milkstone, beerstone, water hardness) | Heated dairy, brewing, hard water | Acid cycle: nitric, phosphoric or blended |
| Biofilm | Any surface cleaned inadequately over time | Mechanical action, full chemistry sequence, sanitizer; prevention over cure |
The chemistry sequence follows from the soil: pre-rinse to remove loose product, caustic wash for organics, intermediate rinse, acid wash for minerals where needed, final rinse, and sanitizer (peracetic acid, chlorine or hot water) before the next run. Plants with light soils drop the acid step to a weekly cycle; dairies and breweries run it daily.
Circuits, flow and the four factors
Cleaning depends on time, temperature, chemical concentration and mechanical action, and in a food plant the mechanical action is the one most often under-delivered. Lines are cleaned by turbulent flow, which means a velocity of about 5 feet per second in the pipe; tanks are cleaned by spray devices, static spray balls or rotating jet heads, whose coverage has to be proven, not assumed. A CIP system is therefore built as circuits, each a defined path with its own supply pump sizing, return, and cycle recipe. Cleaning a filler, a mix tank and a transfer line at the same time needs three circuits running in parallel, which is what drives skid size and cost.
Single-use versus recovery systems
A single-use system makes fresh caustic and acid for each cycle and sends it to drain, which is simple and inexpensive to build and expensive to run. A recovery system holds caustic and acid in dedicated tanks, returns the solution after each cycle, tops up concentration and reuses it for many cycles, with a rinse-water recovery tank capturing the final rinse for use as the next pre-rinse. Recovery systems are the norm in plants that clean more than a few circuits a day because water, chemical, heating and effluent costs dominate the lifetime cost. The trade is capital, tank footprint and a conductivity-based control system that keeps the reused chemistry within its validated range.
Food-plant CIP versus pharmaceutical CIP
- Verification: food plants verify by visual inspection, ATP swabs and, where required, allergen-specific tests; pharmaceutical plants by rinse-water conductivity and TOC against validated limits.
- Water: food plants use potable or softened water for washes and potable for the final rinse; pharmaceutical plants use purified water or WFI for the final rinse.
- Documentation: food plants keep cycle records for the sanitation program and audits; pharmaceutical plants tie every cycle to a batch record with validated parameters.
- Chemistry: food plants use chlorinated and enzyme caustics and peracetic sanitizers; pharmaceutical plants avoid chlorine on stainless.
- Design pressure: food plants optimize for throughput and cost per cycle; pharmaceutical plants optimize for reproducibility and evidence.
What the regulations expect
FSMA’s preventive controls rule (21 CFR 117) requires sanitation controls where they are needed to prevent hazards, with monitoring, verification and records; it does not prescribe a CIP design. 3-A Sanitary Standards define cleanable equipment and the CIP-ability of tanks, valves and fittings. USDA FSIS inspects sanitation in meat and poultry plants directly. Customer audits under SQF, BRCGS or FSSC 22000 look for a written sanitation program, validated cleaning procedures, cycle records and an allergen changeover procedure. The CIP system is the machine that makes those records true.
Allergen changeover and CIP
Allergen control has become the most demanding use of CIP in food plants. Changing from a product containing milk, soy, egg, wheat or nuts to one that does not requires a validated cleaning procedure with a defined worst-case soil, a verification method (allergen-specific swab or rinse test) and records. CIP circuits that serve shared lines need recipes for allergen changeover cycles that are longer or hotter than routine cycles, and the sanitation program has to state which cycle applies when.
What a food-plant CIP skid should include
Solution tanks sized to the largest circuit (one to four depending on recovery), a supply pump sized to the flow that gives 5 feet per second in the largest line or the spray device demand in the largest tank, a return pump or eductor, heating by steam injection or heat exchanger, chemical dosing pumps with conductivity control, temperature and flow instrumentation, a valve manifold for circuit selection, and a control panel with recipes, cycle records and alarms. Plants with satellite areas add portable or fixed CIP skids near the equipment they serve rather than running long supply and return lines.
Common problems in existing food-plant CIP
Circuits that were extended without re-sizing the supply pump, so the added line never reaches turbulent flow; spray balls that never had a coverage test; dead legs at hose stations and manifolds that never see chemistry; return lines that do not drain; recovery tanks running on time rather than conductivity, so chemistry drifts; and recipes nobody has reviewed since the line changed. Most cleaning failures we are called to diagnose are hydraulic or geometric, not chemical.
What Paul Industries does
We design and build CIP systems and skids for food and beverage plants, install the supply and return piping and the sanitary process piping they clean, test spray coverage with riboflavin before handover, commission recipes against the plant’s sanitation program, and connect the cycle records to the plant’s quality system. We also retrofit existing systems: re-sizing pumps, adding recovery tanks, eliminating dead legs and rewriting recipes for allergen changeover.
Standards referenced: 3-A Sanitary Standards · 21 CFR 117 · ASME BPE
Frequently asked questions
What is a CIP system in the food industry?
A clean-in-place system in the food industry is a fixed installation of tanks, pumps, heating, chemical dosing, valves and controls that circulates rinse water, caustic, acid and sanitizer through process equipment and piping to clean it without disassembly, on recipes set for the soil and the equipment. It is the mechanism by which a plant’s sanitation program is executed and recorded between products and at the end of production.
How is a food-plant CIP system different from a pharmaceutical CIP system?
Food plants clean heavier organic and mineral soils, verify by visual inspection and ATP or allergen swabs rather than rinse-water conductivity and TOC, use potable or softened water and chlorinated or enzyme caustics, and optimize for throughput and cost per cycle with recovery tanks. Pharmaceutical CIP uses purified water final rinses, validated parameters tied to batch records and single-use or verified chemistry. The hardware overlaps; the design pressures do not.
What chemicals are used in food-plant CIP?
Sodium hydroxide (caustic) at 1 to 3 percent for fats, proteins and sugars, often with chlorinated or enzyme additives for protein; nitric or phosphoric acid at 0.5 to 2 percent for milkstone, beerstone and water-hardness scale; and a sanitizer, usually peracetic acid, chlorine or hot water, as the final step. Concentrations and temperatures are set per circuit and soil and controlled by conductivity.
What temperature does CIP run at in a food plant?
Caustic washes typically run at 140 to 180 F (60 to 80 C) depending on the soil, acid washes cooler, and sanitizers at ambient or as hot water at 180 F or more. Higher temperature shortens cycles but bakes protein onto heat transfer surfaces if the pre-rinse was inadequate, so the pre-rinse is usually cold or warm rather than hot.
What flow rate does CIP need in a food plant?
About 5 feet per second in the pipe, which is turbulent flow for the sizes used in food lines and is what provides the mechanical action that removes soil. A 2-inch line needs roughly 50 gallons per minute, a 3-inch line about 110 and a 4-inch line about 200. Circuits that were extended without re-sizing the pump are the most common reason a line cleans poorly.
What is a CIP recovery system?
A system that keeps caustic and acid in dedicated tanks, returns the solution after each cycle, restores its concentration with a conductivity-controlled top-up and reuses it for many cycles, with a rinse-water recovery tank capturing the final rinse for use as the next pre-rinse. It cuts water, chemical, heating and effluent costs substantially in plants that clean many circuits a day, at the cost of more tanks and controls.
How many CIP circuits does a food plant need?
One for every group of equipment that must be cleaned at the same time. A plant that cleans its filler, mix tank and transfer line in sequence can use one circuit; a plant that must clean them simultaneously to hit the changeover window needs three, each with its own supply pump and return. Circuit count, not tank count, is the biggest cost driver.
How do you validate CIP cleaning in a food plant?
By defining the worst-case soil and equipment, running the cycle, and verifying with visual inspection, ATP swabs of defined sites, and allergen-specific swab or rinse tests where allergen changeover is involved, then repeating to show consistency. Spray coverage in tanks is proven with a riboflavin test. The validated recipe and its verification method go into the sanitation program.
What do FSMA and 3-A require of a CIP system?
FSMA’s preventive controls rule requires sanitation controls where needed to prevent hazards, with monitoring, verification and records; it does not prescribe the system. 3-A Sanitary Standards define cleanable equipment and CIP-able tanks, valves and fittings. Customer audit schemes such as SQF and BRCGS expect a written sanitation program, validated procedures and cycle records, which the CIP system generates.
How does allergen changeover affect CIP design?
Shared lines need validated allergen changeover recipes, usually longer or hotter than routine cycles, with a defined worst-case allergen soil and an allergen-specific verification test. The CIP control system has to hold those recipes separately and record which one ran, and the sanitation program has to state when each applies.
What is the difference between CIP and COP in a food plant?
CIP cleans equipment in place by circulating chemistry through it; COP (clean-out-of-place) removes parts such as fittings, gaskets, fill heads and small tools and cleans them in a recirculating COP tank or wash cabinet. Most food plants use both: CIP for tanks, lines and heat exchangers, COP for parts that cannot be cleaned in place.
Can a portable CIP skid serve a small food plant?
Yes. A single-tank portable CIP cart with a pump, heater and dosing serves small breweries, creameries and specialty food plants that clean a few circuits a day. As circuit count and cleaning frequency grow, a fixed multi-tank recovery skid becomes cheaper to run than the water and chemistry a portable unit sends to drain.
How are tanks cleaned by CIP?
By spray devices: static spray balls for light soils and small tanks, rotating jet heads for heavy soils and large tanks, sized to the tank and positioned to reach behind agitators, baffles and nozzles. Coverage is proven with a riboflavin test, not assumed. The return pump or eductor must remove solution faster than the spray device supplies it, or the tank floods and the spray pattern collapses.
Why does a CIP cycle fail even with the right chemistry?
Usually hydraulics or geometry: a line below turbulent velocity, a spray ball shadowed by an internal, a dead leg at a hose station or manifold that never sees flow, a return that does not drain, or a recovery tank whose concentration has drifted because it runs on time rather than conductivity. Chemistry is checked first and is the cause least often.
What water does food-plant CIP use?
Potable water, often softened to reduce scale, for pre-rinse and washes, and potable water for the final rinse; recovered final rinse is commonly reused as the next pre-rinse. Purified water is not required unless the product specification calls for it, which is one of the main cost differences from pharmaceutical CIP.
How much does a CIP system for a food plant cost?
It scales with circuit count, tank count and recovery, pump size, heating method and controls. A single-tank skid serving a few circuits sits at the low end; a three- or four-tank recovery system with multiple parallel circuits and full reporting at the high end. Our CIP system cost guide sets out the drivers; the recurring water and chemical cost usually decides between single-use and recovery.
Does CIP replace manual cleaning in a food plant?
For tanks, lines, heat exchangers and fillers designed for it, yes. Equipment that is not CIP-able, conveyors, slicers, some fillers and many packaging machines, is cleaned manually or by COP. A sanitation program combines all three, and the CIP system’s records cover only the circuits it serves.
Which cycle records does a food plant CIP controller need to keep?
For each cycle: the circuit, the recipe, start and end times, temperatures, flows, chemical concentrations by conductivity, any alarms and who released the equipment. Audit schemes expect these to be retrievable by date and circuit and reviewed as part of sanitation verification.
Can an existing food-plant CIP system be upgraded rather than replaced?
Often. Common upgrades are re-sizing supply pumps for extended circuits, adding a caustic or rinse-recovery tank, replacing timed dosing with conductivity control, adding spray coverage testing and rotating jet heads, eliminating dead legs, and replacing a relay panel with a recipe-based controller that produces records. We survey the existing system before proposing either.
Is a CIP system for food industry plants the same as a clean in place system in food industry catalogs?
Yes, the terms are interchangeable: a CIP system for food industry use and a clean in place system in food industry supplier catalogs both mean the fixed installation of tanks, pumps, heating, dosing, valves and controls that circulates rinse, caustic, acid and sanitizer through equipment without disassembly. What differs between suppliers is circuit count, recovery tanks, controls and whether installation and coverage testing are included, which is what a CIP system in food industry procurement should specify.
Related: Process Systems & Sanitary Piping for Food & Beverage Plants · Clean-in-Place (CIP) & SIP Systems · CIP Skids: Portable and Fixed Clean-in-Place Systems · CIP System Cost: What Drives the Price · CIP vs SIP: What’s the Difference? · CIP/SIP System Companies: How to Choose · 3-A Sanitary Standards for Food Processing Piping · Request a quote · Food Plant Sanitary Piping Installation · Food and Beverage Process Tanks and Vessels · Food Plant Wastewater Pretreatment Systems · Nutraceutical Mixing, Cooking and Liquid Process Systems · Food and Beverage Heat Exchangers and Pasteurizers