Level 2 Propane Systems Practice Flashcards

A comprehensive set of fill-in-the-blank practice flashcards for RV technical students studying propane system safety, theory, and hardware based on the Level 2 Propane Systems curriculum.

Propane boils at a temperature of __________ at sea level, which is why it can cause skin to freeze upon contact.

$-44^{\circ}\text{F}$ ($-42^{\circ}\text{C}$)

Propane volume increases by approximately __________ for every $10^{\circ}\text{F}$ ($5.5^{\circ}\text{C}$) it is warmed.

$$1.5\%$$

The maximum safe fill level for a propane container, allowing for expansion, is __________ percent.

$$80$$

__________ states that the volume and pressure of gases are inversely proportional when held at a constant temperature ($PV = k$).

Boyle's Law

A __________ or hum heard when opening the service valve is indicative of a large leak in the propane system.

Hiss

The first-stage regulator reduces the high container pressure down to approximately __________.

$$10\,\text{psig}$$

The second-stage regulator handles the final pressure reduction, typically set to __________ inches of water column (WC).

$$11$$

A regulator is considered defective if its lockup pressure exceeds __________ inches of water column (WC).

$$14$$

According to NFPA 1192, pigtails or high-pressure propane connectors have a maximum allowable length of __________.

$5\,\text{ft}$ ($60\,\text{in.}$)

Beginning September 1, 2005, multiple-cylinder systems must be equipped with a __________ to prevent gas escape during cylinder changes.

Backflow check valve

Propane vaporization occurs primarily through the __________ surface of the container walls.

Wetted

For ASME motorhome tanks, the internal pressure relief valve is designed to open at __________.

$$312.5\,\text{psi}$$

The fixed maximum liquid level gauge uses an orifice no larger than a __________ drill size to restrict gas release.

$$\#54$$

The process of displacing dehydrated air or contaminants from a container using propane vapor is known as __________.

Purging

RV propane piping must be supported and secured at intervals of no more than __________.

$$4\,\text{ft}$$

When using steel tubing for flare connections, the tubing must be __________ to prevent the flares from cracking.

Double flared

Copper tubing joints in RVs must use a __________ degree flaring tool to comply with SAE J533 standards.

$$45$$

On an automatic changeover regulator, the pressure indicator stays __________ as long as the service cylinder is providing propane flow.

Green

The sound heard when gas flows into the downstream system and drives the regulator into its lockup condition is described as a __________.

PFFFT

Type I service valves, required on cylinders manufactured after 2002, are designed to be tightened by __________.

Hand