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New Hampshire Plumbing Practice 12

Practice 12 for Plumbing Exam learners in New Hampshire: 25 questions, explained answers, and a review routine.

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Question 1

1

A water service must deliver 60 gpm with no more than 8 psi friction loss over 120 feet of developed length. Using a friction loss budget, the allowable loss per 100 feet is closest to what?

Question 2

2

A system has 80 psi available, needs 25 psi residual at the top fixture, has 35 feet of elevation, and 4 psi of meter and device losses. How much pressure remains as a budget for pipe friction?

Question 3

3

A 2-inch RPZ is installed on a fire-line feed used for lawn irrigation. During a test the relief valve continuously drips a small amount. The most likely cause is what?

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