Pipe Joining and Fitting Methods Flashcards
7 cards from real 306A 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 Joining and Fitting Methods flashcards as text
What type of solder is required for copper joints in potable water systems under the National Plumbing Code of Canada?
Answer: Lead-free solder containing no more than 0.2% lead
The National Plumbing Code of Canada requires lead-free solder to prevent lead contamination in potable water systems.
After cutting rigid PVC pipe with a hacksaw for a solvent-cemented joint, what must be done to the pipe end before applying primer?
Answer: Deburr and chamfer the pipe end to ensure full insertion and avoid scraping cement from the socket
Deburring and chamfering removes sharp edges that would scrape cement from socket walls and ensures the pipe seats to full depth for a strong solvent bond.
What is the standard taper for NPT (National Pipe Taper) threads used on steel pipe fittings?
Answer: 1 in 16 measured on the pipe diameter (3/4 inch per foot)
NPT threads have a standardized taper of 1 in 16 on the diameter, creating the wedging interference fit that seals the joint.
When making a crimp-ring connection on PEX tubing, which tool verifies that the crimp ring has been correctly compressed?
Answer: A go/no-go gauge that measures the outer diameter of the crimped ring
A go/no-go gauge checks that the compressed crimp ring diameter falls within the specified range, confirming the connection is neither under- nor over-crimped.
Which type of flux must NOT be used when soldering copper pipe in a potable water system?
Answer: Acid (active) flux containing zinc chloride
Acid flux contains zinc chloride which is corrosive and toxic; residue left inside a pipe would contaminate drinking water and accelerate internal corrosion.
When connecting copper pipe directly to a galvanized steel fitting, what type of connector prevents galvanic corrosion at the joint?
Answer: A dielectric union that electrically isolates the two dissimilar metals
A dielectric union separates copper and galvanized steel with a non-conductive barrier, interrupting the galvanic cell that would otherwise cause accelerated corrosion at the joint.
When preparing copper pipe for a push-fit (SharkBite-type) fitting, what is the most critical preparation step?
Answer: Cutting the pipe square and removing all burrs from the pipe end
A square, burr-free pipe end allows the O-ring inside the fitting to seal uniformly around the pipe circumference; burrs or an angled cut cause leaks.