10
Calculation of pressure drops
The values of total static pressure drop can be calculated by adding up the losses from
individual elements built into the air pipeline system and the internal static pressure. The
values of static pressure drops of individual elements (static pressure drops of elements
relate to the internal diameter ø125mm or
□150x70mm) are shown in Table 1.
Type of element
Value of static pressure loss
a.) Spiral ribbed pipe
Diagram 2
b.) Rectangular pipe
□150x70 mm
Diagram 2
(according to DN 125)
c.) Rectangular elbow - horizontal 90°
5 Pa
d.) Elbow 90°
4 Pa
e.) Angular reducer ø125 to
□150x70
5 Pa
f.) Rectangular elbow - vertical 90°
5 Pa
g.) Elbow 45°
3 Pa
h.) Reducer ø125 to
□150x70
3 Pa
i.) Flexible tube
Diagram 2
j.) Air intake grid
25 Pa
Table 1: Types of elements and corresponding pressure loss values
Flexible pipe according to DN 125
Spiral ribbed pipe DN 125
Diagram 2: Value of the static pressure drop for selected pipes
