Interprovincial Exam Overview: Pipes and Valves
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Questions and Answers

Which grade of pipe is capable of withstanding a working pressure of 1000 psi?

  • STD
  • XH
  • XXH
  • XXXH (correct)

    • What is the primary purpose of the back seating feature on a valve?

  • To allow for easier valve operation during maintenance
  • To provide accurate flow measurement
  • To minimize pressure drop in the system
  • To isolate the stuffing box for packing replacement without system shutdown (correct)

    • When tightening a fitting with two wrenches, how should they be applied?

  • Both wrenches should turn in the same direction for better grip
  • One wrench should turn clockwise while the other turns counterclockwise
  • One wrench should stabilize while the other tightens (correct)
  • Both wrenches should be used to loosen the fitting simultaneously

    • What could be a consequence of not using the back seating feature during valve maintenance?

    <p>Potential blowout of the valve stem under pressure</p> Signup and view all the answers

    Which type of fitting would typically require a higher torque during installation?

    <p>High-pressure fittings</p> Signup and view all the answers

    In the context of valve maintenance, what does 'packing' refer to?

    <p>The material that prevents leakage around the valve stem</p> Signup and view all the answers

    Which of the following statements is true regarding pipe grades?

    <p>Higher grade pipes can endure higher working pressures</p> Signup and view all the answers

    What aspect of valve operation is indicated by the back seating feature?

    <p>The valve is wide open</p> Signup and view all the answers

    What is the longest nipple length mentioned in the options?

    <p>12” (300mm)</p> Signup and view all the answers

    What safety precaution should be prioritized when using a magnetic drill above ground?

    <p>Use a ground fault interrupter circuit</p> Signup and view all the answers

    What is the minimum length for a wrap-around as per the provided options?

    <p>1-1/2 times the circumference of the pipe being laid-out</p> Signup and view all the answers

    What does the omega (Ω) symbol indicate on work boots?

    <p>Grade 1 steel toe and sole</p> Signup and view all the answers

    Which is NOT a common feature of knife gate valves?

    <p>Zero leakage</p> Signup and view all the answers

    What is a significant advantage of using a double disc gate valve?

    <p>More efficient sealing capability</p> Signup and view all the answers

    In terms of construction, what distinguishes a knife gate valve from other valves?

    <p>Utilization of a cutting blade</p> Signup and view all the answers

    Which factor is crucial in selecting the correct nipple length?

    <p>Pipe diameter</p> Signup and view all the answers

    What does the 'L' signify in the designation of 316L stainless steel?

    <p>Ultra-low carbon</p> Signup and view all the answers

    A valve marked 125S/200WOG indicates what maximum operating pressure?

    <p>Steam pressure up to 125 psig and water pressure up to 200 psig</p> Signup and view all the answers

    If a 10-inch pipe is 45 feet long and weighs 40 lb per lineal foot, what is the total weight of the pipe?

    <p>1,800 lb</p> Signup and view all the answers

    What is the approximate weight of a 1’ x 1’ x 1” thick steel plate?

    <p>40 lbs</p> Signup and view all the answers

    Which method effectively maintains material traceability on cut pipe pieces?

    <p>Transfer heat numbers using a permanent marker</p> Signup and view all the answers

    What adjustment should be made to the speed of a drill press when using larger drill bits?

    <p>Decrease speed to prevent overheating of the drill bit</p> Signup and view all the answers

    How should eccentric reducers be oriented during installation for condensable vapours?

    <p>Flat on the bottom in vertical lines</p> Signup and view all the answers

    What is the primary reason for using a permanent marker for transferring heat numbers onto pipe cuts?

    <p>They maintain legibility for a longer duration</p> Signup and view all the answers

    In the context of drill press operations, what is the consequence of decreasing speed when using larger drill bits?

    <p>Higher chance of drill bit breakage</p> Signup and view all the answers

    What is the recommended action for measuring heat numbers in a way that avoids loss?

    <p>Use multiple methods of recording for verification</p> Signup and view all the answers

    Which installation method for eccentric reducers could lead to operational issues?

    <p>Flat on top for horizontal installations</p> Signup and view all the answers

    What should not be a part of the procedure when handling larger drill bits on a drill press?

    <p>Using a speed that is too high for bit size</p> Signup and view all the answers

    What is the first step in preparing pipe for joining?

    <p>Cut pipe to desired length</p> Signup and view all the answers

    Which step follows the cleaning of the pipe ends?

    <p>Insert hot irons</p> Signup and view all the answers

    Under which condition can a worker remain on a rolling scaffold while it is being moved?

    <p>When the height of the platform does not exceed 2 times the smallest base dimension</p> Signup and view all the answers

    What is the purpose of using isopropanol in the pipe joining process?

    <p>To clean the ends of the pipe</p> Signup and view all the answers

    What action should be taken immediately after inserting the hot irons into the pipe?

    <p>Wait for the pipe edges to curl</p> Signup and view all the answers

    Which of the following is NOT a correct step in the pipe joining process?

    <p>Insert cold irons into the pipe</p> Signup and view all the answers

    Study Notes

    Interprovincial Exam Overview

    • Exam completed on February 23, 2019, with a perfect score of 100 out of 100.
    • Exam duration was 34 seconds, demonstrating efficiency in answering.

    Key Questions and Concepts

    • Pipe Grades:

      • Grade capable of withstanding 1000 psi is b. XXH.

    • Valves:

      • Back seating feature isolates the stuffing box for packing replacement without shutting down the system.
      • Essential for preventing blowouts during system upsets.

    • Wrenches:

      • When using two wrenches, they should be applied correctly to tighten fittings effectively.

    • Material Traceability:

      • Maintain traceability by transferring heat numbers to cut pipe pieces using a permanent marker.

    • Drill Press Operations:

      • As drill bit size increases, speed must decrease to handle larger bits effectively.

    • Eccentric Reducers Installation:

      • Install flat on the bottom for horizontal lines transporting condensable vapors.

    Pipe and Valve Specifications

    • Longest Nipple Length:

      • The longest nipple length available is 12” (300mm).

    • Mag Drill Safety:

      • Use a ground fault interrupter circuit when using a magnetic drill above the ground for safety.

    • Wrap-Around Length:

      • Minimum length for a wrap-around should be 1.5 times the circumference of the pipe.

    • Omega Symbol on Work Boots:

      • The omega (Ω) symbol designates Grade 1 steel toe and sole protection in work boots.

    Material Properties and Weights

    • Stainless Steel Classification:

      • The “L” in 316L stainless steel denotes Ultra-low carbon content for improved corrosion resistance.

    • Valve Rating Interpretation:

      • A valve marked 125S/200WOG is suitable for steam pressure up to 125 psig and water pressure up to 200 psig.

    • Weight Calculations:

      • A fabricated 10-inch pipe, 45 feet long, weighs 1800 lb (40 lb per lineal foot).
      • Approximate weight of a 1’ x 1’ x 1” thick steel plate is about 40 lbs.

    Scaffold Safety Protocols

    • Workers may remain on top of a rolling scaffold while moving if the platform height is no more than twice the smallest base dimension, ensuring stability.

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    Related Documents

    Section 1 - Interprovincial Exam - Occupational Skills PDF

    Description

    This quiz covers essential concepts related to pipe grades, valve functionalities, and proper tool usage in plumbing systems. Test your understanding of material traceability, drill press operations, and the installation of eccentric reducers. Perfect for professionals in plumbing and pipeline engineering.

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