21. Two pipes namely (1) and (2) carry oil (r.d-0.8) under pressure P1 and P1 respectively. The manometer recording is zero as shown in Figure. It is found that the manometer will record a reading of 100mm when the pipes centerlines are brought to the same level. Calculate the vertical distance h between he pipes, Pipe 1 Pipe 2 OLL rid 0.8 Hg r.d 13.6 21. Two pipes namely (1) and (2) carry oil (r.d-0.8) under pressure P1 and P1 respectively. The manometer recording is zero as shown in Figure. It is found that the manometer will record a reading of 100mm when the pipes centerlines are brought to the same level. Calculate the vertical distance h between he pipes, Pipe 1 Pipe 2 OLL rid 0.8 Hg r.d 13.6