Advantage Engineering
877-290-1853
Search
Open Menu
Close Menu
Home
About
Products
Literature
Parts & Service
Resources
Blog
Contact Us
Open Menu
Close Menu
Home
About
Products
Literature
Parts & Service
Resources
Blog
Contact Us

Number of Drops per Header Size


For a header size of 1/4"
Drop Size
Number of Drops
1/8"
2.1
1/4"
1
For a header size of 3/8"
Drop Size
Number of Drops
1/8"
4.5
1/4"
2.1
3/8"
1
For a header size of 1/2"
Drop Size
Number of Drops
1/8"
8
1/4"
3.8
3/8"
1.8
1/2"
1
For a header size of 3/4"
Drop Size
Number of Drops
1/8"
16
1/4"
8
3/8"
3.6
1/2"
2
3/4"
2
For a header size of 1"
Drop Size
Number of Drops
1/8"
30
1/4"
14
3/8"
6.6
1/2"
3.7
3/4"
1.8
1"
1
For a header size of 1-1/4"
Drop Size
Number of Drops
1/8"
60
1/4"
28
3/8"
13
1/2"
7
3/4"
3.8
1"
2
1-1/4"
1
For a header size of 1-1/2"
Drop Size
Number of Drops
1/8"
88
1/4"
41
3/8"
19
1/2"
11
3/4"
5.3
1"
2.9
1-1/4"
1.5
1-1/2"
1
For a header size of 2"
Drop Size
Number of Drops
1/8"
164
1/4"
77
3/8"
36
1/2"
20
3/4"
10
1"
5.5
1-1/4"
2.7
1-1/2"
1.9
2"
1
For a header size of 2-1/2"
Drop Size
Number of Drops
1/8"
255
1/4"
120
3/8"
56
1/2"
31
3/4"
16
1"
8
1-1/4"
4.3
1-1/2"
2.9
2"
1.6
2-1/2"
1
For a header size of 3"
Drop Size
Number of Drops
1/8"
439
1/4"
206
3/8"
97
1/2"
54
3/4"
27
1"
15
1-1/4"
7.4
1-1/2"
5
2"
2.7
2-1/2"
1.7
3"
1
For a header size of 3-1/2"
Drop Size
Number of Drops
1/8"
632
1/4"
297
3/8"
139
1/2"
78
3/4"
38
1"
21
1-1/4"
11
1-1/2"
7
2"
3.9
2-1/2"
2.5
3"
1.4
3-1/2"
1
For a header size of 4"
Drop Size
Number of Drops
1/8"
867
1/4"
407
3/8"
191
1/2"
107
3/4"
53
1"
29
1-1/4"
15
1-1/2"
10
2"
5.3
2-1/2"
3.4
3"
2
3-1/2"
1.4
4"
1
For a header size of 4-1/2"
Drop Size
Number of Drops
1/8"
1148
1/4"
539
3/8"
253
1/2"
141
3/4"
70
1"
38
1-1/4"
19
1-1/2"
13
2"
7
2-1/2"
4.5
3"
2.6
3-1/2"
1.8
4"
1.3
4-1/2"
1
For a header size of 5"
Drop Size
Number of Drops
1/8"
1525
1/4"
715
3/8"
335
1/2"
188
3/4"
93
1"
51
1-1/4"
26
1-1/2"
17
2"
9
2-1/2"
6
3"
3.5
3-1/2"
2.4
4"
1.8
4-1/2"
1.3
5"
1
For a header size of 6"
Drop Size
Number of Drops
1/8"
2414
1/4"
1133
3/8"
531
1/2"
297
3/4"
147
1"
80
1-1/4"
40
1-1/2"
28
2"
15
2-1/2"
9
3"
5.5
3-1/2"
3.8
4"
2.8
4-1/2"
2.1
5"
1.6
6"
1
For a header size of 7"
Drop Size
Number of Drops
1/8"
3433
1/4"
1635
3/8"
766
1/2"
425
3/4"
212
1"
118
1-1/4"
58
1-1/2"
40
2"
21
2-1/2"
14
3"
8
3-1/2"
5.5
4"
4
4-1/2"
3
5"
2.3
6"
1.4
7"
1
For a header size of 8"
Drop Size
Number of Drops
1/8"
4795
1/4"
2251
3/8"
1954
1/2"
590
3/4"
292
1"
160
1-1/4"
80
1-1/2"
55
2"
20
2-1/2"
19
3"
10
3-1/2"
7.6
4"
5.5
4-1/2"
4.2
5"
3
6"
2
7"
1.3
8"
1
For a header size of 9"
Drop Size
Number of Drops
1/8"
6369
1/4"
2990
3/8"
1401
1/2"
783
3/4"
388
1"
212
1-1/4"
107
1-1/2"
73
2"
39
2-1/2"
25
3"
14
3-1/2"
10
4"
7.3
4-1/2"
5.5
5"
4.2
6"
2.6
7"
1.8
8"
1.3
9"
1

This Piping Header & Drop Size Tool is to be used as a guideline only.

The tool calculates the available area of the piping header and determines the equivalent area of the selected drop size that equals the header area.

In addition to this tool we generally recommend that the fluid velocity in the pipe be between 5-7 feet per second and/or the resultant pressure drop be below 2.3 pounds per square inch per 100 foot of pipe.

Consult factory for additional assistance.

See FYI-166 "Water Distribution & Pipe Sizing".

Download the PDF document.

Download

Need Application Assistance?

Our Experienced Team Can Save You Time & Money.

Tell Us About Your Project