Efv’s Flashcards
(23 cards)
What is an efv?
Eggs are designed to limit the flow of gas if the designed cubic feet per hour is exceeded due to broken line or large leak
Will minimal leakage activate the valve ?
No
How does an efv work?
In normal operation the spring provides the force to hold the plunger open
Does an efv completely stop the flow of gas
No
What do you do if an efv can not be installed due to limitations ?
Install an slsv on all services where the connected load is over 1000 Cfh
When do you install an efv
You install an efv per high pressure service excess flow valve sizing chart
Is an efv required when services are tied into a temporary main as part of a continuous project?
No
Where can you refer to for correct size installation required for EFv
Operation manual under main/service installation EFV 
True or false systems operating 10 to 60 PSIG EFE’s must be installed on all services with a connected load up to 5500 CFH
True
True or false system is operating 10 to 60 PSIG SLSV’s must be installed on all services with a connected load over 5500 CFH
True
True or false systems operate under 10 PSIG we do not install an efv
True
True or false systems operating under 10 PSIG install SLSV on all services with a connected load over 1000 CFH?
True
The end of the stub must be identified as being connected to an EFv what are methods to use to make sure that it’s been identified correctly
Place the EFV ring in a bag and tape it to the end of the main
Print the letters, EFV with a marker on the pipe towards the end of the
Place the ring over the pipe before the end cap is installed in secure ID ring with tape
What way must the flow direction arrow be installed?
Direction of gas flow
What are two different coupling styles for EFV
Lyle and Continental
What do you do prior to connecting pipe to an EFV?
He purchased dirt and debris from downstream service
Connect the service line to the EFB and introduce gas into the service line
Why do we use an EMS marker location when installing a new EFV?
Place directly over coupling and pipe style EFV’s
This is used to locate the EFV in the future
Is an EMS marker required on tapping tea installations
No
Where do you install the EFV riser ring on the rise
Below the stop cock
What do we use to purge an EFV?
Drill bit 40 sized hole
What size hole can be used for 3900 and larger EFV
A 3/8 hole can be used
What is the symbol for an EFE on mapping?
A box with an X
Are you allowed to bypass from riser to riser when there is an EFV?
No
