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POWER ENGINEERING 3A2 QUESTIONS & ANSWERS
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POWER ENGINEERING 3A2 QUESTIONS & ANSWERS
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POWER ENGINEERING 3A2 QUESTIONS & ANSWERS Commented [A1]:What is the acronym for the American Society of Mechanical Engineers? - Answers-
ASME
What is the acronym for The National Board of Boiler and Pressure Vessel Inspectors? -
Answers- NBBI
The Alberta Boilers Safety Association (ABSA) is responsible for the administration of
the legislation for _________ and _________. - Answers- boilers, pressure vessels
What designates the classification of the certificate of competency, required for the role
of chief power engineer? - Answers- Kilowatt rating of the power plant
What is the role of the Chief Power Engineer? - Answers- Supervision of the other
power engineers and the safe, and efficient, operation of the plant
What is the focus of the Engineers regulations? - Answers- State the minimum
qualifications necessary to obtain each class of power engineer certification
The repairs and alterations section of the B-51 outlines the standards that must be
followed when replacing existing pieces of pressure equipment with new pieces of
pressure equipment - Answers- True
What tables are found in the tables section of the B-51 code? - Answers- Categories of
fittings
Minimum dimensions of blowoff vessels
Minimum dimensions of blowoff vessels for coil-tube boilers
What are the two main purposes of the CSA B-52 code? - Answers- To provide for the
safe design, construction, installation, operation and repair of refrigerating and air
conditioning equipment and systems, and related equipment.
To promote uniform requirements among the provinces and territories.
Clear definitions for terms and equipment relating to refrigeration and air conditioning
equipment are described in sections of the B-52 code? - Answers- True
Pressure relief and rupture devices are not covered in the B-52 code? - Answers- False
Calculate the minimum required wall thickness of a superheater tube. The tube is 40
mm O.D. and is connected to a header by strength welding. The maximum allowable
working pressure is 2000 kPa gauge and the average tube temperature is 212°C. The
tube material is alloy steel with specification SA-213-T11. - Answers- 0.5846 mm
Calculate the minimum required wall thickness of a superheater tube. The tube is 100
mm O.D. and is connected to a header by strength welding. The maximum allowable
,working pressure is 2430 kPa gauge and the average tube temperature is 375°C. The
tube material is alloy steel with specification SA-192. - Answers- 2.014 mm
Calculate the maximum allowable working pressure, in kPa, for a watertube boiler tube,
which is 73.5 mm O.D. and has a minimum wall thickness of 4.71 mm. The tube is
strength-welded into place in the boiler and is located in the furnace area of the boiler.
Tube material is carbon steel, SA-192, with a mean wall temperature of 380°C. -
Answers- 9.921 Mpa
Calculate the minimum required wall thickness of a boiler tube which is strength welded
to a header. The maximum allowable working pressure is 4450 kPa, and the mean wall
temperature is 370°C. The tube material is SA-192 and the outside diameter is 50 mm. -
Answers- 1.62 mm
Calculate the maximum allowable working pressure, in kPa, for a watertube boiler tube,
which is 76 mm O.D. and has a minimum wall thickness of 3.25 mm. The tube is
strength-welded into place in the boiler and is located in the furnace area of the boiler.
Tube material is carbon steel, SA-192, with a mean wall temperature of 375°C. -
Answers- 6.2 Mpa
Calculate the minimum required wall thickness of a superheater tube. The tube is 76
mm O.D. and is connected to a header by strength welding. The maximum allowable
working pressure is 4150 kPa gauge and the average tube temperature is 400°C. The
tube material is alloy steel with specification SA-213-T11. - Answers- 1.88 mm
Calculate the minimum required plate thickness of a welded boiler drum having an
inside radius of 935 mm and a maximum design working pressure of 9020 kPa. The
plate material is SA-516 grade 70 and metal temperature does not exceed 320°C. Weld
reinforcement on the longitudinal joints has been removed flush with the surface of the
plate. - Answers- 72.96 mm
Calculate the minimum thickness required for a welded steel pipe of material SA-209
grade T1b, plain end. The outside diameter of the pipe is 273.05 mm and the operating
pressure and temperature are 2000 kPa and 400°C, respectively. - Answers- 3.04 mm
A steam header between the boiler and first stop valve is to be fabricated of 152.4 mm
O.D. pipe. The material specification is SA-369 FPA seamless pipe. The operating
pressure will be 8440 kPa at 420°C. The pipe will be joined by full penetration welds
and will be fully radiographed. Calculate the minimum thickness of the pipe wall if the
manufacturer's tolerance is 12.5%. - Answers- 10.90 mm
What standard regulates Boiler, Pressure Vessel, and Pressure Piping Code? -
Answers- CSA B51
What standard regulates Mechanical Refrigeration Code? - Answers- CSA B52
,What code regulates the rules for Construction of Power Boilers? - Answers- ASME
Section I
What code regulates the recommended guidelines for the care of Power Boilers? -
Answers- ASME Section VII
What code regulates Chemical Plant and Petroleum Refinery Piping? - Answers- B31.3
What is the main focus of the National Board of Boiler and Pressure Vessel Inspectors
(NBBI)? - Answers- To establish uniform qualifications for inspectors and acceptance of
standard code requirements
Today, all Canadian provinces and most of the states in the United States, require
boilers and pressure vessels to be inspected during fabrication by an inspector holding
a National Board commission - Answers- True
Qualified and authorized boiler and pressure vessel manufacturers need not be
registered with the National Board. - Answers- False
What standard regulates Boiler, Pressure Vessel, and Pressure Piping Code? -
Answers- CSA B51
What standard regulates Mechanical Refrigeration Code? - Answers- CSA B52
What code regulates the rules for Construction of Power Boilers? - Answers- ASME
Section I
What code regulates the recommended guidelines for the care of Power Boilers? -
Answers- ASME Section VII
What code regulates Chemical Plant and Petroleum Refinery Piping? - Answers- B31.3
What is the main focus of the National Board of Boiler and Pressure Vessel Inspectors
(NBBI)? - Answers- To establish uniform qualifications for inspectors and acceptance of
standard code requirements
Today, all Canadian provinces and most of the states in the United States, require
boilers and pressure vessels to be inspected during fabrication by an inspector holding
a National Board commission - Answers- True
Qualified and authorized boiler and pressure vessel manufacturers need not be
registered with the National Board. - Answers- False
What information will be found in the Boilers and Related Components of the B-51
code? - Answers- This section identifies the standards used in the design, construction,
installation, inspection, testing, and repair, along with water gauges, low water cut off,
, fusible plugs, boiler installation, inspection openings, outlet dampers, blowoff tanks, and
cast iron steam and hot water boilers
The pressure vessels section of the B-51 code identifies pressure vessels and their
installation, including pressure vessel inspection openings. This section also shows the
design of cushion tanks, blowoff vessels, and the installation of air receivers - Answers-
True
What information will be found in the Boilers and Related Components of the B-51
code? - Answers- This section identifies the standards used in the design, construction,
installation, inspection, testing, and repair, along with water gauges, low water cut off,
fusible plugs, boiler installation, inspection openings, outlet dampers, blowoff tanks, and
cast iron steam and hot water boilers
The pressure vessels section of the B-51 code identifies pressure vessels and their
installation, including pressure vessel inspection openings. This section also shows the
design of cushion tanks, blowoff vessels, and the installation of air receivers - Answers-
True
A boiler drum is made of SA-515-70 steel and has a ligament efficiency of 0.66. If the
steam temperature is 280°C and the inside diameter of the drum is 1.6 m and the
thickness of the drum is 68.45 mm. What will the maximum operating pressure be, in
kPa? - Answers- 6500 kPa
Calculate the required minimum thickness (in mm) of steam piping which will carry
steam at a pressure of 4300 kPa gauge and a temperature of 370°C. The piping is
plain-end, 273.05 mm O.D.; the material is low alloy steel, SA-335 P11. A
manufacturer's tolerance of 12.5% must be added to the pipe. - Answers- 5.61 mm +
tolerance = 6.31 mm
Calculate the minimum thickness required for a seamless steel feedwater pipe of
material SA-209, grade T1. The outside diameter of the pipe is 323.85 mm and the
operating pressure and temperature are 5200 kPa and 500°C respectively. The pipe is
plain-ended. Assume that the material is an austenitic steel. - Answers- 11.85 mm
Calculate the required thickness, in mm, of a superheater outlet header, operating at
500°C and having a maximum allowable working pressure of 17 MPa. The header
material is SA-335-P7 and the outside diameter is 457.2 mm. - Answers- 54.35 mm
Calculate the maximum allowable working pressure for a welded drum if the plates are
25 mm thick and of material SA-299. The inside diameter of the drum is 988 mm and
the joint efficiency is 100%. Assume the steam temperature will not exceed 400°C. -
Answers- 5.305 Mpa
Calculate the thickness of a seamless, unstayed dished head with pressure on the
concave side, having a flanged-in manhole 280 mm by 380 mm. The head has a
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