Answer the following with True or Falls.

a$.$ Individually vented fixture traps increase siphonage and back pressure problems.

b$.$ Minimum recycled steel content in construction is $25\%.$

c$.$ Gasline utility pipes are typically colored orange.

d$.$ Drain and sewer pipe sizing depend on dfu loading.

e$.$ Stack pipe offset of $30$ is sized as a horizontal pipe.

Why do DWV pipes have thinner walls?

What is the minimum size of copper tubes when used with waterlines?

What is the difference between Schedule $40$ and Schedule $80$ pipes?

What type of valve is used on the exterior to combat frosting?

$6.$ What type of valve is useful for balancing hot and cold water?

If a drain branch has a slope of $\frac{1}{8}$ and carries the load of $270$ dfu, what should the drain size be$?$

You have $2$ urinals $($wall$-$hung $1\frac{1}{2}$ trap$)$ and $1$ lavatory connecting to a stack in a $5$ story building.

a$.$ How many dfus is the system?

b$.$ What should be the stack diameter?

You have a fixture located $55ft$ above the water meter that requires $35$ psi pressure. Assume friction loss is $3$ psi and available pressure is $60.$ Is there enough pressure for the fixture?