306A Pipe Joining and Fitting Methods 2

Question 1

When joining ABS or PVC drain pipe with solvent cement, what motion is used when inserting the pipe into the socket?

Accepted Answer

Give the pipe a quick quarter-turn while pushing to full depth, then hold without rotation

Answer

A quarter-turn during insertion distributes the cement evenly across the bonding surfaces and achieves correct alignment; holding the joint prevents it from backing out while the cement sets.

Question 2

What is the correct sequence of operations when cutting and threading steel pipe on a power threading machine?

Accepted Answer

Cut to length, ream the inside, thread, apply sealant, then assemble

Answer

Cutting first ensures proper length; reaming after cutting removes the internal burr created by the pipe cutter; threading follows reaming, and sealant is applied just before assembly.

Question 3

What is the approximate pressure rating of 1-inch Schedule 40 PVC pipe at 23°C for cold water service?

Accepted Answer

Approximately 690 kPa (100 psi), with the rating decreasing as temperature rises

Answer

Schedule 40 PVC is rated near 690 kPa (100 psi) at room temperature, but this rating drops significantly with increasing temperature, which is why it cannot be used on hot water supply lines.

Question 4

When soldering a copper fitting, where should the heat from the torch primarily be directed?

Accepted Answer

To the fitting body, allowing capillary action to draw solder fully into the joint

Answer

Heating the fitting body warms the entire joint assembly so that when solder contacts the pipe-fitting interface, capillary action pulls the molten solder completely into the gap.

Question 5

In which direction should PTFE thread tape be wound around male pipe threads before making a connection?

Accepted Answer

Clockwise when viewed from the threaded pipe end, in the direction of thread engagement

Answer

Applying PTFE tape clockwise (in the direction the fitting will be threaded on) ensures the tape seats into the threads during assembly rather than unravelling as the fitting is tightened.

Red Seal Plumber 306A Practice Test

Red Seal Plumber 306A Practice Test

306A Pipe Joining and Fitting Methods 2