Dear Petten,

Why use flexible hoses for pressures up to 8 bar ( which are very expensive) instead of ordinary steel pipe?

Flexible hoses will wear, due to pulsing movements during conveying and are vulnerable to external damage.

The convey air has to be released from the receiving vessel through a pressure relieve valve, causing a considerable energy loss.

The pressure setting of the filter pulse air of the self cleaning filter in the receiving vessel is another issue to be considered.

Under atmospheric conditions, the pulse pressure is approx. 4 bar.

This means a pressure ratio of 5

In your design, the pulse pressure would become 5 x 3 = 12 bar

Is there also a vertical distance involved?

Are there temperatures involved?

Then the calculation is executed as usual, taking into account a backpressure at the end.

Which back pressure do you want to be calculated?

best regards

teus ■

Dear Petten,

Preliminary calculation for a backpressure of 3 bar

(Lower backpressures will result in higher capacities)

Pipeline:

140 m – diameter 4” (0.100 m)

70 m – diameter 6“ (0.148 m)

Compressor 16.4 m3/min at 8 bar

Power approx 175 kW

Pressure drop 5 bar (8 – 3 = 5 bar)

Capacity approx. 50 tons/hr

SLR = 61.09

If needed, I can also post the full set of calculation figures (or change the design to a single diameter pipeline).

take care

teus ■