Pipe Testing and Inspection Flashcards
7 cards from real PIPEFITTER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pipe Testing and Inspection flashcards as text
What is the correct sequence of steps when isolating a section of piping for a pressure test using spectacle blinds?
Answer: Depressurize, install blind, test, remove blind and restore
The line must be depressurized and isolated before installing the spectacle blind; testing is then performed, and the blind is removed to restore flow after the test.
In radiographic testing (RT) of a weld, what does a 'density' reading refer to?
Answer: The darkness of the radiographic image
Density in RT refers to the degree of blackening on the radiographic film, which is controlled to ensure defects of the minimum required size are detectable.
Which ASME code governs the testing requirements for process piping systems in industrial facilities?
Answer: ASME B31.3
ASME B31.3, Process Piping, governs the design, fabrication, and testing requirements for piping in chemical and industrial process plants.
When a piping system cannot be hydrostatically tested due to structural limitations, what alternative test may be used with additional precautions?
Answer: Pneumatic test
A pneumatic test using compressed gas may be substituted for hydrostatic testing when the system cannot support the weight of water, but it requires additional safety precautions due to stored energy hazards.
What is the significance of a 'zero-leakage' requirement in a seat leakage test for valves?
Answer: No leakage is permitted past the valve seat at test pressure
Zero-leakage seat testing (Class VI per ANSI/FCI 70-2) means no measurable fluid passes the closed valve seat during the test, required for critical shut-off applications.
A pipefitter is asked to perform a 'soap bubble test.' Which type of pressure test is this method commonly used to verify?
Answer: Pneumatic or gas leak test for joint tightness
The soap bubble method is a simple, effective technique for locating leaks during pneumatic or gas pressure tests by applying soap solution to joints and watching for bubbles.
What does 'MAWP' stand for and why is it critical during pipe testing and inspection?
Answer: Maximum Allowable Working Pressure — the upper pressure limit the system is designed to safely handle
MAWP (Maximum Allowable Working Pressure) defines the safe operating pressure limit; test pressures are calculated as a multiple of MAWP to verify the system can handle normal and surge conditions.