Answer:
estimate the time since construction of the bridge is 6.66 year
Explanation:
given data
area of the plate = 750 cm²
corroded away during use = 2.5 kg
corrosion penetration rate = 0.5 mm/year
density of the alloy = 10 g/cm³
solution
we know here area is express as
CPR = ................1
put here value ans we get t
t =
t = 58400 hour
time = 6.66 year
Answer:
The rate of heat loss from the pipe by convection is 433113 Btu/h
Explanation:
Given that:
The length of the steam pipe = 300 ft
Temperature of the open space = 50 ° F
Outside diameter = 4 ㏑ = 4/12 ft = 0.333 ft
Avg, temperature of the surface of the pie = 280° F
Avg. convection of heat transfer h = 6 Btu/h·ft²·°F
We are to Determine the rate of heat loss from the pipe by convection
Let first calculate the area of the heat transfer;
A = πdh
A = πdL
A = π× 0.333 ft ×300 ft
A = 313.85 ft²
The rate of heat loss from the pipe by convection can now be calculated by using the formula:
Replacing our values from above ; we have:
Therefore, the rate of heat loss from the pipe by convection is 433113 Btu/h