B112: NJ HIGH PRESSURE BLACK SEAL EXAM_HP STEAM SYSTEM 5 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS 100% CORRECT RATED A+

B112: NJ HIGH PRESSURE BLACK SEAL
EXAM_HP STEAM SYSTEM 5
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT RATED A+

Question: A high-pressure power boiler produces steam at 500 PSI with a
measured temperature of 625°F. If the standard saturation temperature for steam at
this exact pressure is 467°F, what is the calculated degree of superheat?
 100°F
 158°F
 212°F
 250°F
Answer: ✔✔ 158°F (Calculation: $625^\circ\text{F} - 467^\circ\text{F} =
158^\circ\text{F}$ of superheat).


Question: If a steam table indicates that the normal saturation temperature of
steam at 100 PSI is 338°F, how would steam at 100 PSI with an actual measured
temperature of 400°F be classified?
 Saturated
 Superheated
 Wet steam
 Subcooled
Answer: ✔✔ Superheated (Note: Any time the actual temperature of steam
exceeds its saturation temperature at a given pressure, it is considered
superheated).

, A boiler with an MAWP of 150 psi and a safety valve setting of 100 psi with a 3"
valve disc - what would be the total force needed to open the safety valve against
opposing spring force?


Note: TF = PSI x Sq. inch x 0.7854


708 lbs, ex: 100 psi x (3x3) x 0.7854




What is the function of a dry pipe in a boiler?


to remove moisture from a steam drum




A safety valve data nameplate suggests that the orifice opening on the valve is 1.5
inches w/ a set pressure of 98 psig. What's the total force acting on the valve?


NOTE: TF = PSI x Sq. Inch x 0.7854


ex: 98 x (1.5 x 1.5) x 0.7854


173 lbs