Question

Air bubble 5. A mercury manometer is used to measure the pressure difference in the two pipelines of Fig. 5. Fuel oil is flowing in A and SAE 30 lube oil is flowing in B. An air pocket has become entrapped in the lube oil as indicated. Determine the pressure in pipe B if the pressure in A is 15.3 psi. Fuel oil 18 in SAE 30 oil Mercury Fig 5

Answer 1

We have used the fact that the density of air is negligible and pressure at the same depth remains same to obtain the result as described above.

we know, density of fuel où . 55 llofts : = 0.03183 bbles 3 Weight pensity of SAE 30 lube oil = 0.0316 Mble3 weight Density of water in Morge3 = 69:4 kb/ft 3 -0.036 lblen 3 SLER Now, - Pat (A fuel oil x 21) + Jug X 6 - (VSAOX 18 - USA 20X (5-3) = PB Putting all values we get - 15:3+ (0.03183 X 21) + (13-6X0036X 6– (0.0316X18) -(0'0316 X2) = PB - » 1 Po= 18:274 psi An