The pressure in a natural-gas pipeline is measured with a double U-tube manometer, one arm of which is open to the atmosphere (local P_{atm} = 14.2 psia). In the first U-tube (mercury, SG = 13.6) the mercury surface on the gas side is 6 in lower than the mercury surface in the other arm. Above that second mercury surface, a tube filled with air leads to a second U-tube containing water; the water in the open arm stands 27 in above the air–water interface. Neglecting the air column, determine the absolute pressure in the pipeline (ρ_{water} = 62.4 lbm/ft^{3}; answer in psia).