Installation Techniques Flashcards

What action is required before a gas technician can cut into an existing live gas main for a new service connection?

Answer: Obtain a BGE line location, secure all necessary permits, and follow hot-tap or pressure-reduction procedures

Before cutting into a live main, the technician must confirm line location, obtain permits, and follow approved hot-tap or pressure-control procedures to safely make the connection.

Which type of thread sealant is acceptable for use on gas pipe threaded connections?

Answer: Yellow PTFE tape or pipe dope specifically listed for gas service

Only yellow PTFE tape or pipe dope specifically listed for gas service should be used on gas pipe threads, as water-rated products may degrade when exposed to gas.

After installing a new gas service to a home, BGE requires the service to be purged before lighting appliances. What gas is used to purge the air from new piping?

Answer: Natural gas is slowly introduced to displace air from the lowest point outward

Natural gas is introduced slowly to displace air from the new piping system, with gas released at the open ends until a consistent gas smell indicates full purge.

What is the purpose of a CSO (Curb Stop/Curb Valve) installed on a gas service line?

Answer: It is BGE's control point to shut off gas to the service without entering the property

The curb stop is a valve installed near the property line that BGE uses to control gas supply to the service without needing access to the customer's property.

When installing gas piping in a garage, which additional requirement applies compared to interior residential installation?

Answer: Gas piping in garages must be installed at least 18 inches above the floor to protect against vehicle impact and fuel vapors

Gas piping in garages must be installed at least 18 inches above the floor because heavier-than-air fuel vapors accumulate near the floor, and the elevation also protects against vehicle impact.

When is it necessary to install excess flow valves (EFVs) on new or replaced gas service lines?

Answer: EFVs are required on new or replaced service lines for single-family residences where the customer requests one

Federal regulations require gas utilities to install EFVs on new or replaced service lines to single-family residences when the customer requests one, as they automatically shut off gas flow if a line is damaged.

What is the correct way to test a completed gas installation for leaks using a combustible gas detector?

Answer: Move the probe slowly along all joints and connections at a rate not exceeding 1-2 inches per second while monitoring the reading

The probe must be moved slowly at 1-2 inches per second along all joints so the instrument has time to sample and detect even small gas concentrations.