How much load require for compressing the piston? ?

Question

As shown in figur A and Figur B. Figur A pipe length 40 feet height and 8cm dia connected to the cylinder dia of 30cm and  length 60cm

figur B pipe length 65feet and dia 8cm connected to the cylinder dia 8cm length of 60cm
Here in both diagram volume of water is both are same only different is cylinde dia and pipe length in this condition what is the effert required to push the piston to over com the water, upword ignore friction and piston thickness

Philomel · Accepted Answer

You have mixed units.
Convert everything to Metric or English.
The pressure of a column of water is .433 Psi/foot of height.

billrussell42 · Answer

what is missing in both cases, or not readable, is the height of the piston above the lowest point of the "U" in the tube.  That number subtracted from the height of the tube is the difference in height, and determines the pressure on the piston.

pressure is determined by that height, and equals the weight of that column of liquid with 1 m² cross-section area.

for example 60 ft = 18.3 m
volume = 19.3 m³
mass of water = 998 kg/m³ x 19.3 m³ = 18250 kg, which x9.8 is a weight of 178900 N, resulting in a pressure of 178900 Pa or N/m²

now you have a piston 30 cm, 0.3 m in diameter, area is πr² = 0.283 m²
178900 N/m² x 0.283 m² = 50600 N

James · Answer

Ultimately, this function requires us to weigh process throughput against ... As the compressor piston moves to compress gas, the differential ... for many years were the basis for rating "rod loads" of reciprocating compressors.

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How much load require for compressing the piston? ?

3 Answers