U.S. D.O.T. PHMSA Excess Flow Valves Group Meeting · U.S. D.O.T. PHMSA Excess Flow Valves Group...
Transcript of U.S. D.O.T. PHMSA Excess Flow Valves Group Meeting · U.S. D.O.T. PHMSA Excess Flow Valves Group...
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U.S. D.O.T. PHMSA
Excess Flow Valves
Group Meeting
Applications beyond single
family residence
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Brief Introduction
• R.W. Lyall remains dedicated to working with its customers to provide the products they need to provide safe and reliable service.
• R. W. Lyall first entered the EFV market in 1992 to meet a customers specific need.
• Today, R. W. Lyall supplies EFV’s to over 200 customers in the U.S.A., Canada & Mexico with an estimated 1MM units sold.
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Expanding EFV Application
• We need to be clear on what we are expanding.
• A device that is designed to reduce the flow of gas when conditions exceed predetermined levels.
• A device that takes advantage of Bernoulli’s principles to provide the force to close some sort of sealing mechanism that is normally held open by an opposing force(spring, magnet, gravity, etc.).
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An Illustration
• Actuation of a
Mechanical
Excess Flow
Valve is Directly
Dependent upon
Gas Velocity
through the
orifice causing a
pressure drop
across the valve.
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What’s Happening?
• The plunger
is exposed
to three
forces
Downstream
pressure
Upstream
pressure
Spring
Plunger
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How Do They Work?
• When the
pressure
drop across
the device is
just right…
Downstream
pressure
Upstream
pressure
Spring
Plunger
• Snap! – The
EFV closes.
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What does this mean?
• This device actuates when a specific
pressure differential signature is created.
• This principle of operation remains true as
the size of the device and “trip point” of
the device are increased.
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What does this mean?
• The device itself does not know what
EXCESS flow is.
• It is very reliable but “Dumb”.
P Valve EFV Valve
=When properly sized
and designed into
the service system
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How Do I Determine the Correct EFV
for My Application?
• ASTM F 2138 suggests that an EFV should be selected with a trip flow, at the distribution system minimum pressure, above the maximum customer load, and above meter capacity.
• For residential services the anticipated load is determined and the appropriate EFV is selected to prevent Nuisance Trips and provide protection for the entire service length.
• For Commercial and Industrial applications sizing needs to be even more carefully considered as load requirements can be more variable.
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Why is this important?COMMERCIAL EFV SIZING EXAMPLE
MIN TRIP
MAX TRIP
.92 Inch Hole
215241 Inch Hole
1.2 Inch
Hole
.75 Inch Hole
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
0 20 40 60 80 100 120 140
psig
SC
FH
2 IPS DR 11 Service Pipe (1.92" I.D.)
150 Ft Service Length
6 psig min. @ Regulator
EFV
Min. Trip 20000 SCFH
@ 10 psig
Future Load = 6 X 3000 SCFH
»180 thm
Initial Load = 6 X 800 SCFH
»48 thm
1st look EFV Min. Trip
5500 SCFH @ 10 psig
15,200
SCFH
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What does Damaged Pipe Look Like?
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Summary
• The devices are relatively simple and will reliably function under specific conditions.
• The principles of operation remain the same as sizes become larger and “Trip points” are increased.
• The device only becomes an EXCESS flow valve when it is properly sized within the service system.
• Not all situations will derive the same benefits from the installation of an EFV.
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Thank you!
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