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Type of perforation
% open area
number of holes per 1m²
Insert the parameters
% open area
number of holes per 1m²
Rv
round staggered
R² x 90,69
T²
1,154,700
T²
R:
T:
Qg
square in line/straight
C² x 100
U²
1,000,000
U²
C:
U:
Rg
round in line/straight
R² x 78,50
U²
1,000,000
U²
R:
U:
Qv
square staggered
C² x 100
0,5 x (Z1 x Z2)
1,000,000
0,5 x (Z1 x Z2)
C:
Z1:
Z2:
Lv
oval staggered
(R x L - 0,215R²) x 100
0,5 x (Z1 x Z2)
1,000,000
0,5 x (Z1 x Z2)
R:
L:
Z1:
Z2:
Lg
longitudinally in line
(R x L - 0,215R²) x 100
(Z1 x Z2)
1,000,000
(Z1 x Z2)
R:
L:
Z1:
Z2:
Examples of different types of holes with maximum % of open area:
prekladtu - Rv 2-2,5 - 58,04%
prekladtu - Qg 10-12 - 69,44%
Type of perforation
Rv
round staggered
prekladtu
R³ x 90,69
T²
1,154,700
T³
Calculation:
prekladtu
prekladtu
R:
T:
Examples of different types of holes with maximum % of open area:
prekladtu - Rv 2-2,5 - 58,04%
prekladtu - Qg 10-12 - 69,44%
Typ děrovaní
Qg
round staggered
prekladtu
C² x 100
U²
1,000,000
U²
Calculation:
prekladtu
prekladtu
C:
U:
Type of perforation
Rg
round in line/straight
prekladtu
R³ x 78,50
U²
1,000,000
U²
Calculation:
prekladtu
prekladtu
R:
U:
Type of perforation
Qv
square staggered
prekladtu
C² x 100
0,5 x (Z x Z )
1,000,000
0,5 x (Z x Z )
Calculation:
prekladtu
prekladtu
C:
Z1:
Z2:
Type of perforation
Lv
oval staggered
prekladtu
(R x L - 0,215R²) x 100
0,5 x (Z x Z )
1,000,000
0,5 x (Z x Z )
Calculation:
prekladtu
prekladtu
R:
L:
Z1:
Z2:
Type of perforation
Lg
longitudinally in line
prekladtu
(R x L - 0,215R²) x 100
(Z x Z )
1,000,000
(Z x Z )
Calculation:
prekladtu
prekladtu
R:
L:
Z1:
Z2: