4.1 module 3

For residential & small commercial propane applications, system delivery for appliance inlet pressure typically _____

Natural gas meters are more widely used than propane meters.

210 CFH of natural gas =____ CFH of propane

Effective , ____NFPA 58 prohibits the installation of single-stage regulators in residential central heating systems.

NFPA 58 States :The relief valve for a single-stage regulator may be the same as for a second-stage regulator.

When planning an installation, the meter must be plumb and level in all directions.

Natural gas has more btus per cubic foot than propane

Most propane appliances require an input pressure of around _____" w.c., or about ½ lb of pressure.

Vapor meters have ______ formed by a ____ diaphragm.

When sizing vapor meters for ½ lb systems, select the meter according to its capacity at 2" w.c. pressure drop.

The regulator should be constructed of materials that are compatible with LP-gas service and the external environment.

2nd stage regularos have a flow capacity to meet the total gas demand of all the appliances connected to the regulator.

When 2+are installed in the same location, NFPA 54 requires that each meter be tagged to indicate the specific customer.

Which of the following is not a factor to consider when selecting a regulator?

Btu/hr demand of the appliances will not affect the piping layout, size and number of gas piping entry points required.

To select the appropriate 2nd stage regulator, you will need to consider

___________ are pre-assembled units designed to connect gas meters to supply piping.

_____ show the capacity of a regulator at different delivery pressures given the factory setting for outlet pressure.

Do not adjust a regulator until you have been trained how to do so.

The delivery pressure of the first-stage regulators is set at the factory and is typically __________.

Do not attempt to change the setting of a regulator relief valve.

Regulator selection is based on _______________.

To prevent regulator freeze-up due to vent blockage the regulator should be mounted so that the ___

Vapor meters are not affected by both the gas pressure inside the meter and the atmospheric pressure on the outside.

When reading the dials of a circular index, start with

what is a factor to consider when designing a second-stage regulator system?

Most propane vapor meters are designed to operate with an inlet pressure of ________

The inlet pressure for a first-stage regulator is determined by the