Steam & Condensate Systems — Steamfitter/Pipefitter (307A) Practice Questions

Free Steam & Condensate Systems practice questions

1. 1.What is the primary function of a steam trap?

   • A.Trap steam in the system
   • B.Remove condensate, air, and non-condensables while preventing live steam from escaping✓
   • C.Filter steam
   • D.Regulate pressure

   Why: Steam traps discharge condensate (water) and air while keeping live steam in the system. Failed traps waste energy (blowing steam) or flood equipment (backed-up condensate).

2. 2.Water hammer in a steam system is caused by:

   • A.High pressure
   • B.Condensate accumulation being picked up by high-velocity steam, creating a slug that impacts piping/fittings✓
   • C.Low pressure
   • D.Clean steam

   Why: Steam water hammer: condensate collects (poor drainage), steam pushes it at high velocity, and the water slug impacts elbows, valves, or dead ends with tremendous force. Can rupture piping.

3. 3.The minimum drip leg diameter should be:

   • A.Half the main size
   • B.Equal to the steam main size for mains ≤4", at least half for larger mains✓
   • C.1/4" always
   • D.Same as trap connection

   Why: Drip legs should be full pipe size for mains up to 4". For larger mains, minimum half the pipe size. Undersized drip legs can't capture all condensate, leading to water hammer.

4. 4.Flash steam occurs when:

   • A.Steam condenses
   • B.High-pressure condensate is released to a lower pressure — some re-evaporates into steam✓
   • C.Water freezes
   • D.Steam is superheated

   Why: Hot condensate at saturation temperature contains more energy than water at the lower system pressure can hold. The excess energy flashes some water back to steam. Flash tanks capture this energy.

5. 5.When warming up a cold steam system, the procedure is:

   • A.Open the main valve fully immediately
   • B.Open slowly, crack the valve to allow gradual warming and condensate drainage through traps before fully opening✓
   • C.Close all drains
   • D.Bypass the traps

   Why: Slow warm-up: crack the steam supply valve, allow condensate to drain through traps, watch for water hammer, gradually increase flow. Rapid warm-up causes thermal shock, water hammer, and gasket failures.

6. 6.A vacuum breaker on a steam system prevents:

   • A.High pressure
   • B.Vacuum formation during shutdown that could collapse the vessel or cause water siphonage✓
   • C.Steam leaks
   • D.Noise

   Why: When steam condenses in a closed vessel during shutdown, volume decreases dramatically creating vacuum. Vacuum breakers allow air in to prevent vessel collapse and backflow.

7. 7.A desuperheater reduces steam temperature by:

   • A.Removing heat with fins
   • B.Injecting water into the superheated steam flow✓
   • C.Adding air
   • D.Reducing pressure only

   Why: Desuperheaters spray controlled amounts of water into superheated steam. The water absorbs superheat as it evaporates, bringing steam closer to saturation temperature.

8. 8.Steam system insulation reduces:

   • A.Noise only
   • B.Heat loss (saving fuel), condensation formation, and burn hazard to personnel✓
   • C.Weight
   • D.Vibration

   Why: Insulation: reduces heat loss (major energy savings), minimizes condensate formation (less drip leg load), and protects workers from burn contact with hot piping.

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