Failure to adopt a reliable and practical clean-in-place (CIP) system can lead to catastrophic batch contamination in any production process. The only way to mitigate this risk is by selecting the correct spray ball for your specific application.
In this guide, we examine various types of spray balls – from their mechanical designs and working principles, to their distinct advantages and disadvantages.
What is Spray Ball?
A spray ball is a tank-cleaning device made of stainless steel used in CIP (clean-in-place) systems. It sprays water or chemicals in all directions inside the tanks, for efficient cleaning without dismantling the entire system.
Types of Spray Balls
· Static Spray Balls
A static spray ball is a reliable fixed tank-cleaning device that is used in CIP (cleaning-in-place) operations to spray water or cleaning solution inside the tanks to clean them.
It’s a simple and durable spray made of stainless steel for corrosion resistant use and hygienic cleaning.
Cleaning Mechanism
A static spray ball provides a simple, low maintenance and reliable performance because it has no moving parts making it ideal for food, pharmaceutical, dairy and beverage.
Your preferred liquid is pumped into the spray ball through the connected pipe in the CIP system where it spreads evenly inside the chamber.
It then exits through many small holes around the ball, creating multiple spray jets that hit the tank walls, top and bottom.
However, the pressure and flow of the spray jets loosen and wash away all the contaminants from the tank surfaces.
| Type of Static Spray Ball | Description |
| Spherical | · Used to spray cleaning liquid in multiple directions to wash the interior of tanks during CIP cleaning. |
| Tangential | · It is designed with holes drilled at an angle around the ball allowing the cleaning liquid to spray in angled jets that spreads widely across the tank surfaces. |
| Spray Bubble | · Designed with a rounded shape that sprays water or cleaning chemicals to wash contaminants from the internal surfaces of tanks. |
Advantages
Among the key advantages of these types of spray balls include:
- They are more affordable compared to other devices
- Static spray balls are easy to install and connect to CIP pipelines
- They have no moving parts making the simple and reliable to use
- Due to its simple design, they require very low maintenance
- Commonly made from stainless steel making them corrosion-resistant and long-lasting
- Because of their simple structure, they are ideal for food, dairy beverage and pharmaceutical industries
Limitations
Even as you choose these spray balls, you must be ready to deal with these key challenges:
- They are less suitable for tanks with sticky products
- The spray ball has spray jets with lower impact compared to other devices like rotary spray cleaner
- In large tanks, some areas may not receive enough spray hence uneven cleaning in large tanks
· Rotating Spray Balls (Dynamic Spray Balls)
A dynamic spray is a rotating stainless steel nozzle that you use to spray cleaning liquid with high pressure hence providing thorough and efficient tank cleaning in CIP systems.
Cleaning Mechanism
The dynamic spray ball is more effective compared to static spray ball because it cleans tanks with high pressure while rotating.
Cleaning products are pumped into the spray ball through the connected CIP system automatically rotating caused by turbine or internal mechanism of the spray. Therefore, it exits through angled holes while the ball rotates hence creating moving high pressure jets that strike all the surfaces of the tank.
However, the automatic effect of the rotating spray loosens and washes away stubborn dirt flowing to the tank drain, leaving the surfaces clean.
Advantages
Among the key advantages of installing these spray ball include:
- Since it’s made from stainless steel, it’s suitable for beverage, pharmaceutical, dairy, food and chemical industries
- It is time saving increasing operational efficiency in production areas
- The rotating jets clean thoroughly removing residues because they provide a complete coverage of all tank surfaces
- Efficient for large tanks, tanks with irregular shapes or complex tanks since the y provide a complete coverage of all tank surfaces
- Dynamic spray has a high cleaning impact because the mechanical force of the rotating spray helps to remove stubborn or sticky dirt
Limitations
For these systems, you will deal with these key challenges:
- It has a very high risk of mechanical failure since the moving parts can fail of hard particles enters the mechanism, leading to low cleaning efficiency
- More expensive than static spray due to moving parts and complex design
- They need more complex installation hence they may need secure mounting for good performance
Specialized Types of Spray Balls
At times, you may opt for specially designed spray balls to meet specific needs or certain systems. By doing so, you can achieve the specialized cleaning needs of every tank system.
Among the most popular options in the industry are:
Controlled Rotary (Motor Driven) Spray Ball
Motor driven spray ball is a cleaning system with controlled rotation, regulated speed and spray pattern used in CIP to achieve thorough and efficient tank cleaning.
- Cleaning Mechanism
Cleaning liquid enters the nozzle under pressure, expelled through small holes producing high-velocity jets. The jets hit the tank surfaces to remove residues while controlled rotation ensures 360 uniform coverage of the tank surface.
The loosened residues is then flashed out through the drain leaving the tank clean. Usually, the controlled rotary designs offer these key advantages:
- High cleaning efficiency.
- Automated and safe.
- Uniform cleaning coverage.
- Reduces water and chemical use.
On the other hand, they also have these key limitations:
- Higher cost.
- Potential mechanical failure.
- Requires complex maintenance.
3D Rotary Jet Heads
A 3D rotary jet head is a tank-cleaning nozzle that rotates in multiple axes creating a 360 coverage pattern inside the tank to provide thorough and efficient cleaning of tanks.
- Cleaning Mechanism
Pressurized cleaning liquid enters the rotary jet head; the nozzles convert pressure into high-velocity jets striking the tank walls with strong mechanical force.
However, the jet head rotates in multiple axes producing a 3D sweeping action ensuring full coverage of all surfaces dislodging stubborn residues.
Also, the rotating jets create turbulent flow which flushes away loosen dirt towards the drain leaving the tank clean. They main advantages of these systems are:
- Reduced cleaning time
- Lower chemical and water usage
- Excellent cleaning coverage
- High cleaning efficiency
At the same time, these systems have the following challenges:
- Requires complex maintenance
- High initial cost
- Requires sufficient pressure and flow
· Retractable Spray Balls
Retractable spray balls are tank –cleaning nozzles commonly used in CIP to extend into the tank during cleaning and retract after to avoid contamination.
- Cleaning Mechanism
The spray ball extends into the tank using a spring pneumatic to position the nozzle centrally to maximize coverage. Pressurized liquid is then sprayed through multiple holes to create jets of high-velocity liquid impacting the tank walls hence loosening contaminants.
Some retractable spray balls rotate during cleaning to ensure uniform cleaning hence reaching all corners.
Therefore after cleaning, the spray ball retracts into housing, keeping it clean and protected. Among the key advantages of these systems include:
- Versatile application
- Automated operation
- Hygienic design
- Full tank coverage
- Protects the nozzles by retracting to prevent damage during normal tank operation
Whenever you choose these systems, you will encounter these key limitations:
- Higher cost
- Requires proper pressure and flow.
- Not always necessary for small or simple tanks.
· Dual-phase Spray Balls
Dual-phase spray balls are nozzles made from stainless steel designed to operate two cleaning phases; the liquid phase and the air phase to reduce cleaning time and chemical use.
- Cleaning Mechanism
Liquid under pressure is sprayed through small nozzles on the spray ball forming high-velocity spray jets that strikes the tank walls releasing the dirt on the surface.
However, stubborn contaminants are removed by air or another liquid which is introduced to create a turbulence that improves mechanical scrubbing action.
The mixture of air and liquid produces a strong turbulence which scrubs and removes stubborn residue from the tank walls.
The dirt is then flushed out through the drain, leaving the tank clean. The main advantages of these systems include:
- Less cleaning time is used.
- Ideal for clean and aseptic industries.
- It covers all the tank surfaces.
- Improved cleaning efficiency.
- Lower Water and chemical usage.
In certain applications, you will face these key challenges:
- Requires more difficult maintenance.
- The installation cost id higher compare to other devices.
- It consumes a lot of energy.
Comparing Static vs Dynamic Spray Balls
Let’s have a quick comparison of these dynamic and static systems in the table below:
| Properties to Compare | Static Spray Ball | Dynamic Spray Ball |
| Cleaning Action | · Use permanent nozzles to spray. | · Uses rotation or dual-phase action to spray. |
| Flow and Pressure | · Moderate to high | · Lower than static spray. |
| Maintenance | · Simple to maintain. | · More complex to maintain. |
| Cost | · Lower initial cost | · Higher initial cost |
| Recommended Applications | · Ideal for small and light contamination | · Ideal for large tanks and heavy residues. |
How to Choose Spray Ball for Cleaning Process
· Tank Geometry and Size
You should ensure the spray and the throw length provides a complete coverage of all walls since the shape of the tank can affect the spray coverage.
Whether static spray or dynamic spray, ensure the spray covers all corners and the bottom to prevent interfering with CIP operation.
· Type of Contaminants to Clean
Ensure you match the type of contaminants to the spray ball type when choosing the spray ball for effective cleaning and proper hygiene.
For light contaminants like food particles, static spray balls are usually sufficient. Therefore, ensure even coverage with appropriate water spray.
However, sticky materials like oils use hot water, chemical agents and dynamic spray balls for high pressure cleaning.
· Flow and Pressure
You should consider static spray if you want a spray with a moderate pressure and a lower flow rate.
However, if you want a spray with a higher pressure and higher flow rate, then dynamic is good for you.
You can use the manufacturer charts to match flow rate to tank size, ensuring the flow rate delivers enough liquid to cover the tank and the pressure gives enough spray strikes.
· Industry Standard & Compliance
Make sure your spray ball meets hygiene standards, must be sterilizable, FDA-approved and suitable for hygienic backgrounds.
Make sure there is safe and effective process under normal and cleaning conditions since manufactures often provide certifications or test reports proving compliance with hygiene.
· Spray Pattern
Spray pattern entails 360 full coverage; 180 upward/downward. Therefore ensure your tank surfaces are all covered.
Spray pattern ensures complete cleaning coverage and prevents residue buildup.
· Material Compatibility
You should consider a spray ball that can resist the process fluids or product stored in the tank like food which may require food-grade stainless steel.
CIP system uses chemicals like acidic cleaners. So your spray ball must be made from materials that do not react when exposed to these chemicals.
· Positioning
When installing the spray ball, make sure you position its spray where it can reach all tank surfaces without destruction.
You can position it at the top center or using multiple units for large tanks hence to ensure effective CIP cleaning.
· Connection and Installation
You must choose the appropriate fitting since spray balls are connected to the tank or CIP pipeline using different fittings.
Install your spray ball in a correct position for maximum spray coverage and effective cleaning. Install at the top of the tank to allow cleaning liquid to flow downward and cover all surfaces.
· Maintenance Requirements
Consider maintenance requirement such as accessibility for inspection so that you can easily remove and inspect your spray ball during maintenance routine.
Look at durable materials that are easy to clean like stainless steel because they resist corrosion, chemicals and high temperatures.
You should also consider maintenance of moving parts for dynamic spray balls which have moving parts that may wear over time.
FAQs
1. What is the function of spray ball in clean-in-place (CIP) systems?
Spray ball is mainly used in CIP system to spray cleaning liquid inside tanks without dismantling them hence the spraying liquid removes dirt and sanitizes the surfaces.
2. How do you calculate the required flow rate for balls?
You can calculate the required flow rate for a ball using this formula;
Q=Cv /SG
Where;
Q= flow rate
Cv= flow coefficient
SG=specific gravity of the fluid
P=Pressure drop across the spray ball system
3. What may stop ball from rotating?
Your ball may stop to rotate due to mechanical damage, over tightened seals, debris, freezing, corrosion or general wear.
4. What is “throw length” in spray ball mechanism and why does it matter?
Throw length basically measures how far the cleaning liquid travels from a spray balls to the tank walls during CIP procedure.
5. Can you use spray balls in aseptic processes?
You can use spray balls only if they meet strict sanitary standards and are compatible with CIP/SIP system.
Partner with OMSS
At OMSS, we design and manufacture different types of spray balls custom-made to match your unique project needs. Whether you are looking for static or dynamic spray balls, OMSS is your strategic partner in China.
Partner with us today for competitive prices and flexible MOQs on all your orders.
