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How to Inspect, Evaluate and Repair Hydraulic Structures


Quiz Questions

1.This course describes about the inspection, evaluation, and repair of hydraulic steel structures, including pre-inspection identification of critical locations (such as fracture critical members and various connections)
True
False
2. Corrosion can seriously weaken a structure or impair its operation, so the effect
of corrosion on the strength, stability, and serviceability of hydraulic steel structures must be evaluated.
True
False
3.What are the factors that can contribute to fracture and weld-related cracking in hydraulic steel structures?
Material properties
Welding influences
Thick plates
All of the above.
4.Fatigue is known as the process of cumulative damage caused by repeated cyclic loading.
True
False
5.Proper operation and maintenance of hydraulic steel structures are necessary to prevent structural deterioration.
True
False
6.What are the primary steps that are to be considered necessary to perform a periodic inspection adequately?
Preinspection assessment
Inspection
Evaluation
Recommendations
All of the above
7.For the results of an inspection to be worthwhile, the inspector must be qualified.
True
False
8.What are the qualifications necessary for individuals to inspect welds adequately?
A welding inspector must be familiar with engineering drawings and able to interpret specifications.
False

A welding inspector should be familiar with welding processes and welding procedures.
A welding inspector should be able to maintain adequate records.

A welding inspector should have passed an eye examination with or without corrective lenses to prove near-vision acuity of Snellen English, or equivalent, at 300 mm (12 in.), and far-vision acuity of 20/40, or better.

All of the above.
9.Material information that may be required to evaluate a steel structure includes chemical composition, tensile strength, bend ductility, fillet weld shear strength, hardness, and fracture toughness.
True
False
10.Tension tests provide information on the strength and ductility of materials under uniaxial tensile stress.
True
False
11.Hardness measurements provide indications of metallurgical changes caused by welding, metallurgical variations, and abrupt microstructural discontinuities in weld joints, brittleness, and relative sensitivity to cracking under structural loads.
True
False
12.Fracture toughness testing provides a measure of resistance to fracture of a material.
True
False
13.Structural evaluation is the process of determining the capability of a structure to perform its intended function.
True
False
14.Traditional member/frame structural analysis or even finite element methods can be used to evaluate the effect of reduction in sections from corrosion damage.
True
False
15.The type of structural repair details selected will be determined considering the following factors.
Cause of damage.
Remaining service life of the structure./p>
Frequency and type of future inspections.
Construction constraints.
All of the above.
16.The primary means to avoid corrosion is by providing a protective coating system.
True
False
17.The appropriate method for repairing cracks in a given situation is dependent on the size and location of the crack and the type of detail at which the cracking occurs.
True
False
18.The general guidelines for a welded crack repair are as follows:

  • Clean area and determine extent of crack with dye penetrant testing.
  • Drill hole at crack tip location.
  • Gouge out crack and prepare joint as a full-penetration groove weld in accordance with
    ANSI/AWS D1.1.
  • Preheat and weld joint using runout tabs and backing as required per American National Standards Institute/American Welding Society (ANSI/AWS) D1.1.
  • Remove backing and runout tabs.
  • Grind weld smooth.
  • Ream hole to remove weld metal and smooth edges.
  • Verify removal of crack tip with dye penetrant testing.
  • Inspect weld with appropriate nondestructive testing
True
False
19.The general guidelines for a welded crack repair are as follows:

  • Determine extent of crack with dye penetrant testing.
  • Drill hole at crack tip location.
  • Verify removal of crack tip with dye penetrant testing.
  • Prepare and install bolted repair over the crack.
True
False
20.Peening is effective as a retrofit for shallow surface cracks that commonly occur at fillet weld toes.
True
False