DC THIRD CLASS STATIONARY BOILERS 323 EXAM 2026 FULL REVIEW AND STUDY COMPENDIUM

DC THIRD CLASS STATIONARY BOILERS 323
EXAM 2026 FULL REVIEW AND STUDY
COMPENDIUM

◉ What is the total force acting on a 4½" pressure relief valve with a
popping Pressure of 500 psi? Answer: Formula = TF = P x A
TF = P x (d x d x 0.7854)
TF = 500 x (4½ x 4½ x 0.7854)
TF = 7,952.17 lbs


◉ At what pressure will a 3" pressure relief valve lift with a 1500-
pound spring? Answer: Formula = P = TF ÷ A
P = 1500 ÷ (3 x 3 x 0.7854)
P = 1500 ÷ 7.07
P = 212.20 psi


◉ At what pressure will a 2½" pressure relief valve lift with a 6500-
pound spring? Answer: Formula = P = TF ÷ A
P = 6500 ÷ (2½ x 2½ x 0.7854)
P = 6500 ÷ 4.91
P = 1,324.17 psi

, ◉ 92°C =? Answer: °F = (°C x 1.8) + 32
F = (92 x 1.8) + 32
F = 197.6°F


◉ 31°C =? Answer: °F
F = (°C x 1.8) + 32
F = (31 x 1.8) + 32
F = 55.8 + 32
F = 87.8°F


◉ 60°F =?°C Answer: C = (°F - 32) ÷ 1.8
C = (60 - 32) ÷ 1.8
C = 28 ÷ 1.8
C = 15.55°C


◉ 185°F =?°C Answer: C = (°F - 32) ÷ 1.8
C = (185 - 32) ÷ 1.8
C = 153 ÷ 1.8
C = 85°C


◉ 85°F =? °Rankin Answer: R = °F + 460
R = 85 + 460