Choose Orifice and Tip Sizes

Calculations For Inner Coulters

IMPORTANT:

N102269-UN-21FEB13

Coulter With Knife

N102268-UN-14MAR13

Coulter With Injector

A - Orifice

B - Tip

See CALCULATIONS FOR OUTER COULTERS to determine orifice and tip sizes for outside rows.

NOTE: Knives work best at pressures between 25-35 psi. Setting pressure higher can result in splatter.

Injectors work best at pressures between 20-30 psi. Setting pressure above 35 psi is not recommended.

To calculate orifice (A) and tip (B) sizing, the following parameters must be known:

• Average Desired Speed of Application (MPH)
• Width of Row Spacing in Inches (W)
• Desired Application Rate in Gallons Per Acre (GPA)
• System Pressure (psi)

To convert GPA to Gallons Per Minute (GPM), use the following equation:

GPM = (GPA x MPH x W)/5940

or, alternatively:

GPM = [(gal/1000 sq ft) x MPH x W]/136

This number represents desired GPM per nozzle.

Use charts to choose correct component sizes:

Knife Orifice Size Chart
John Deere Part Number	Orifice Size (A)	Gallons Per Minute (GPM) Per Nozzle At Shown System Pressure
		10 psi	20 psi	30 psi	40 psi
5FTCP491663	63	0.246	0.347	0.425	0.491
5FTCP491665	65	0.261	0.369	0.452	0.522
5FTCP491672	72	0.320	0.453	0.554	0.640
5FTCP491675	75	0.347	0.491	0.601	0.694
5FTCP491678	78	0.385	0.544	0.667	0.770
5FTCP491680	80	0.397	0.561	0.687	0.793
5FTCP491689	89	0.490	0.693	0.849	0.980
5FTCP491691	91	0.523	0.739	0.905	1.05
5FTCP491693	93	0.547	0.774	0.947	1.09
5FTCP4916103	103	0.653	0.923	1.13	1.31
5FTCP4916107	107	0.733	1.04	1.27	1.47
5FTCP4916115	115	0.855	1.21	1.48	1.71
5FTCP4916125	125	0.980	1.39	1.70	1.96
5FTCP4916132	132	1.10	1.55	1.90	2.19
5FTCP4916140	140	1.27	1.79	2.19	2.53
5FTCP4916144	144	1.31	1.85	2.27	2.62
5FTCP4916151	151	1.47	2.08	2.55	2.94
5FTCP4916177	177	2.00	2.83	3.46	4.00

Injector Tip Size Chart
John Deere Part Number	Tip Size (B)	Gallons Per Minute (GPM) Per Nozzle At Shown System Pressure
		15 psi	20 psi	30 psi	40 psi
5FTTP0004	4	0.21	0.25	0.3	0.35
5FTTP0006	6	0.32	0.37	0.46	0.53
5FTTP0008	8	0.43	0.50	0.61	0.71
5FTTP0010	10	0.54	0.62	0.76	0.88
5FTTP0015	15	0.81	0.94	1.15	1.33
5FTTP0020	20	1.08	1.25	1.53	1.77
5FTTP0030	30	1.62	1.87	2.29	2.65
5FTTP0040	40	2.17	2.50	3.07	3.54

Calculations For Outer Coulters

Vertical Fold Machine
Number of Coulters	Row Spacing (in.)	Number of Rows in Swath	Rate applied To Outer Rows
23	20	24	1.5
25	20	24	0.5
23	22	24	0.5
11	30	12	1.5
13	30	12	0.5
15	30	16	1.5
17	30	16	0.5
11	36 or 38	12	1.5
13	36 or 38	12	0.5
11	40	12	1.5
13	40	12	0.5

Side Fold Machine
Number of Coulters	Row Spacing (in.)	Number of Rows in Swath	Outer Rows Application Factor
35	20	36	1.5
37	20	36	0.5
35	22	36	1.5
37	22	36	0.5
23	30	24	1.5
25	30	24	0.5
17	40	16	0.5

Depending on machine type, outer coulters will apply either 50% or 150% of solution compared to inner coulters. Use charts to determine correct multiplication factor for machine size.

Using GPM number from INNER COULTER charts, multiply by a factor of 0.5 or 1.5 to determine correct sizing for outer.

0.5 = 50% Inner Coulter Application Rate (GPM)

1.5 = 150% Inner Coulter Application Rate (GPM)

To determine desired applications rates for outer coulters, use the following equation:

GPM Per Nozzle x 0.5

or

GPM Per Nozzle x 1.5

Example:

Inner Coulter GPM = 1.08 with size 20 tip, then 50% Outer Coulter GPM = 1.08 x 0.5 = 0.54 GPM. A size 10 tip would be used to achieve 50% application rate.

or

Inner Coulter GPM = 1.08 with size 20 tip, then 150% Outer Coulter GPM = 1.08 x 1.5 = 1.62 GPM. A size 30 tip would be used to achieve 150% application rate.

Match GPM values to ones shown in KNIFE ORIFICE or INJECTOR TIP SIZE charts to choose correct size components for desired application rates at outer coulters.