For the conditions of Problem 13.122, find the length,

L, of commercial steel pipe of 2 in. diameter between sections 1 and 2 .

Consider the laboratory Fanno-line flow channel of

Problem 13.123. Assume laboratory conditions are 22.5C

and 760 mm of mercury (uncorrected). The manometer

reading at a pressure tap at the end of the converging nozzle

is 211.8 mm of mercury (gage). Calculate the Mach number

at this location. Determine the duct length required to attain

choked flow. Calculate the temperature and stagnation

pressure at the choked state in the constant-area duct.