If you have ever looked closely at your sprayer nozzles you probably noticed a set of letters and numbers stamped on them. If you are curious like me, then you probably wonder what those numbers mean. The aim of this post is to help you identify your spray nozzle by understanding what the letters and numbers on sprayer nozzles actually mean.
If your nozzles are on a spray boom, they are likely flat fan nozzles. This nozzle type follows a standard numbering system regardless of the nozzle manufacturer. The numbers on a flat fan sprayer nozzle indicate the type of nozzle, the angle of the spray pattern, and the nozzle’s orifice size. Some nozzles will also have letters that indicate the material of construction.
Other types of nozzles like flood tips, adjustable nozzles, boomless nozzles, and tree-spraying nozzles, do not follow a universal numbering system but they will still have a number that indicates the nozzle type and size.
What Do The TeeJet Nozzle Numbers Mean?
TeeJet nozzles are super popular and used in many industries. The numbers you find on a Teejet nozzle use the same ISO standard numbering system as other flat fans nozzles
Flat Fan Sprayer Nozzle Part Numbers: Example and Explanation
Sometimes the sprayer tip part numbers are clearly listed on the nozzle, and sometimes they are harder to see. The numbers may be on the side of the nozzle or the very tip near the nozzle opening.
In the image below there is a sprayer nozzle with the part number: MR110-06. The two letters are the nozzle type, MR (red box in the image below). Then the first three numbers are the spray angle, 110 degrees (blue box in the image below). Followed by the last two numbers that refer to the orifice size of the nozzle, in this case: 06 (green box in image).
Sprayer Nozzle Types
Just like with other pieces of equipment, each spray nozzle manufacturer has its own product names for each type of nozzle they produce. The differences between nozzle types are in the spray pattern, droplet size, material of construction, and more. The letters at the front of the spray nozzle number will indicate the nozzle type.
In the image above you can see an “MR” spray tip made by Wilger. “MR” stands for mid-range reduction. This refers to the level of drift reduction that this nozzle type offers. The MR tip will produce a medium to very coarse droplet size, depending on the orifice size and pressure (more on this later). This style nozzle is a flat fan spray tip made to fit on a sprayer boom.
The difference between different flat fan sprayer nozzles is subtle. Different nozzle types may look a little different but the spray pattern and droplet size they produce is what separates them. You can see in the chart below some examples of flat fan sprayer nozzles. The differences are small but they are intended to meet specific spray needs.
Spray Nozzle Droplet Size
Droplet size is important because it affects spray coverage and the drift a nozzle creates. A smaller droplet may provide better coverage but it is affected by wind and more likely to drift away from your intended target. Coarser droplets may not provide the same surface coverage, but they are prone to less drift.
Droplet sizes are measured in microns, the bigger the number the larger the droplet. Smaller droplets are called fine, very fine, and so on. Large droplets are referred to as coarse, very coarse, etc. Orifice size and pressure can affect droplet size. Nozzle manufacturers will have charts showing the droplet size for a nozzle at different pressures. Generally, as pressure goes up the droplet size becomes finer no matter what kind of spray nozzle it is.
Sprayer Nozzle Angle
Flat fan and cone nozzles come in different spray angles. This is what the first set of numbers on a sprayer nozzle indicates. The most common for ag or turf spraying is 80 and 110 degrees, however, many more angles are available.
Choosing the correct spray angle will be based on the nozzle spacing on your sprayer boom and the height of your boom during operation. 110-degree fans allow your boom to be closer to the ground while still overlapping each nozzle to get good coverage and reduce drift.
Sprayer Nozzle Size
The last set of numbers provides the orifice size. This is the size of the opening in the tip and it directly correlates with the flow rate at 40 psi. This way of numbering nozzle sizes comes from an ISO standard for sprayer nozzles. For an 06-size tip, the flow at 40 psi is 0.6 GPM. The chart below shows the different nozzle sizes that are universal for flat-fan and cone nozzles used on sprayers.
The spray nozzle color code is a universal way to identify the flow capacity of flat-fan sprayer nozzles. It helps you to easily identify what the flow rate of your nozzle is regardless of the manufacturer or nozzle type.
How do I know what Spray Nozzle Size I need?
Every nozzle type will have a chart that the manufacturer provides. The nozzle charts will show the different outputs for each spray nozzle at different PSI as well as the droplet size that is produced at that PSI.
The nozzle size you need will be based on your application rate. To determine the size of the nozzles for your sprayer boom, you will need to know these 4 things:
- The gallon per acre rate you want to apply (GPA)
- Your preferred operating pressure (PSI)
- The speed you will travel (MPH)
- The spacing between your nozzles (Inches)
You can figure your gallon per minute using this formula:
(Gallons Per Acre X Mph X Nozzle Spacing) / 5940 = GPM Per Nozzle
Once you know the GPM flow rate you need to achieve your desired rate, you can refer to the nozzle chart to identify what size tip you should use.
How to Read a Spray Nozzle Chart
Below is a sprayer nozzle chart from TeeJet. It shows the capacity and droplet sizes produced at a certain pressure for the “Turbo TeeJet” nozzle type. You can see in the far left column the sprayer tip number. Notice the numbers are the same except for the last couple of digits. TT is the code for the nozzle type, 110 is the spray angle of the fan, and the last couple digits refer to the nozzle’s capacity.
Let’s walk through an example of how to figure your GPM and use the nozzle chart.
Example: An ATV sprayer boom with 3 nozzles spaced 20 inches apart. You desire to travel 5 MPH and the rate you need to apply is 15 GPA. So you would take 15 (rate) x 5 (speed) x 20 (spacing), then divide the total by 5940. Your total GPM needed per nozzle comes out to just over 0.25 GPM.
Now you need to refer to the nozzle rate chart to find a tip that puts out .25 GPM at the appropriate pressure you want to spray at. In the chart above you can see the GPM capacity if shown in the column marked with the green arrow. In that column, you would look for 0.25. In this scenario, you can see that the purple-colored tip, number TT110025, will produce 0.25 GPM at 40 PSI. The chart also shows that it will produce a medium-sized droplet.
This tip is not our only option though. The TT11003 (blue) tip would also work. While we don’t have 0.25 GPM exactly, we do see 0.26 at 30 PSI. So at roughly 28 PSI this tip would flow about 0.25 and create a coarse droplet size. If you wanted to operate at a lower PSI and have less worry about drift, the TT11003 would actually be the nozzle you want to choose.
Spray nozzle charts can be complicated, for a complete guide be sure to read this complete guide on understanding spray nozzle charts.
Non-Flat Fan Sprayer Numbers
When it comes to most other types of sprayer nozzles, spot sprayer nozzles, boomless nozzles, etc., there is no universal numbering system. However, the numbers will still provide us with some information about nozzle type and capacity.
Most nozzles have a number on them. This number usually correlates to the nozzle’s capacity. Just like with flat-fan nozzles, there will be a chart provided by the manufacturer, this will provide the flow rate/capacity info.
As with flat fan nozzles, some of the numbers can be hard to find. Usually, they will have a number that tells you the nozzle size located somewhere on the tip.
Boomless nozzles have a wide range of sizes and spray patterns, but since they are meant to be used on their own or as a pair, their nozzle charts don’t require you to do as much calculation to find your GPM. In this post, you can read more about selecting a boomless sprayer nozzle.
Why The Numbers On Your Spray Nozzle Matter
Sprayer nozzles are made to perform a specific way. If you don’t have the right nozzle your entire sprayer can be rendered ineffective. Knowing what the numbers on your sprayer nozzle mean will help you identify the right nozzles for your spraying task.