SIKA Aliva 257 Top, User Manual

Page: 59 / 348

Operating instructions Aliva-257 Top 5 Technical data
Version 1.0 49
5.3 Air consumption
5.3.1 Dry spraying
5.3.1.1 Example calculation
We provide an example calculation here to show you how to calculate the air
requirements
.
Task 4 m
3
/h dry mixture is to be conveyed 120 m; the selected hose diameter is 50/
70 mm.
Basics • Clean hose lines, curve radii min. 50 x RW.
• Moisture of dry mixture: max. 5%.
• Height above sea level 400 m.
Calculation
• Theoretical compressed air
consumption Approx. 9.8 m
3
/min
→
10 m
3
/min
(rounded because pneumatic supplies
cannot be calculated with 100% accuracy)
• Empty air resistance Approx. 1 bar
• Required air pressure Approx. 4.2 bar
Fig. 5.1
Diagram for
example calculation
0
1
2
3
4
5
6
20 40 60 80 100 120 140 160 180 200 220 240
7,2 8,7 9,8 10,5 11,3 12
6m
3
/h
5m
3
/h
4m
3
/h
2m
3
/h
[m3/min.]
[m]
3m
3
/h
9.8 10
1
4.2
Dry-spraying hose ø50
Reference values for air consumption and pump pressure
Air consumption
Empty air
Pressure dif
ference (bar)
263.082_EN
Conveying dist.