CETP Instructor PowerPoint Template 2.0

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NFPA 58, LP-Gas Code, sets out the minimum valve
and fitting requirements for propane tanks used
to supply dispensers. Selecting or verifying that
dispenser tank valves and fittings are proper for
a certain installation requires an examination of
the application and operating requirements for
the dispenser, and company operating procedures.

• In this module you will learn to
• Identify NFPA 58 code requirements for ASME tank
  valves fittings
• Verify proper specifications and protection
  measures for tank relief valves
• Verify that proper components for the dispenser
  installation are provided

5.1.2 Student Book ? 2005 Propane Education Research Council Page 1
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Identifying NFPA 58 code requirements for ASME
tank valves and fittings
NFPA 58 definitions of propane dispensers are
given in 3.3.21.1 Dispensing Station 3.3.21.2
Vehicle Fuel Dispenser
5.1.2 Student Book ? 2005 Propane Education Research Council Page 1
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NFPA 58 required dispenser tank valves and
fittings generally include

1. Double backflow check filler valve (tanks with
   filler opening less than 1½ inch diameter)
2. Manual shutoff valve for vapor service
3. Fixed maximum liquid level gauge, often a
   component of a multi-valve including a manual
   shutoff valve
4. Internal spring-type relief valve (aboveground
   tanks external type for underground tanks)
5. Float gauge
6. Actuated liquid withdrawal excess-flow valve
   (this valve is optional when a liquid withdrawal
   valve with excess-flow is provided)

5.1.2 Student Book ? 2005 Propane Education Research Council Page 2
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Dispenser tank valves and fittings that are
optional or not specifically required by Table
5.7.7.1 generally include

1. Backflow check and excess-flow vapor return
   valve(s)
2. Manual shutoff liquid valve with internal
   excess-flow check valve
3. Pressure gauge (tanks greater than 4000 water
   gallons)

Dispenser supply tanks typically incorporate
items 1, 2, 3, 4, 5, and 8.
5.1.2 Student Book ? 2005 Propane Education Research Council Page 2
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Figure 1. Required and Optional Dispenser Supply
Tank Valves Fittings
5.1.2 Student Book ? 2005 Propane Education Research Council Page 3
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Figure 2. Dispensing Station/Vehicle Fuel
Dispenser Component Diagram
5.1.2 Student Book ? 2005 Propane Education Research Council Page 3
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5.7.7.4 ASME containers over 4000 gallons water
capacity shall also be equipped with the
following appurtenances

1. An internal spring-type, flush-type full
   internal, or external pressure relief valve (see
   Annex E)
2. A fixed maximum liquid level gauge
3. A float gauge, rotary gauge, slip tube gauge, or
   a combination of these gauges
4. A pressure gauge
5. A temperature gauge

5.1.2 Student Book ? 2005 Propane Education Research Council Page 4
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Verifying proper specifications and protection
measures for tank relief valves
5.1.2 Student Book ? 2005 Propane Education Research Council Page 5
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6.7.2.5 The rain cap or other protector shall be
designed to remain in place, except during
pressure relief device operation, and shall not
restrict pressure relief device flow. 6.7.2.7
The pressure relief valve discharge on each
aboveground container of more than 2000 gallon
water capacity shall be piped vertically upward
to a point at least 7 feet above the top of the
container, and the discharge opening shall be
unobstructed to the open air.
5.1.2 Student Book ? 2005 Propane Education Research Council Page 5
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Verifying that proper components for the
dispenser installation are provided
Filler valve or other filling systems
Figure 5. Double Backflow Check Filler Valve
for Tanks with Filling Opening Less Than 1½ Inch
5.1.2 Student Book ? 2005 Propane Education Research Council Page 7
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Dispenser supply tanks over 4,000 gallons water
capacity or having a filling opening diameter
1½-inch or larger require a transfer bulkhead
equipped with an emergency shutdown valve (ESV)
for the vapor equalizing connection (if 1¼-inch
or larger), and an ESV for the liquid fill
connection. A backflow check valve may be used
for the liquid line if flow of liquid is limited
to one direction (into the dispenser supply
tank).
5.1.2 Student Book ? 2005 Propane Education Research Council Page 7
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Internal valves and excess flow requirements
The dispenser supply tank liquid opening that
connects to the propane transfer pump must be
fitted with an internal excess-flow valve. For
supply tanks not located in a bulk or industrial
plant having water capacities of 4,000 gallons or
less a positive shutoff valve must be provided in
conjunction with the internal excess-flow in one
of the two methods listed below

1. A manual valve located in the piping immediately
   down-stream of the excess-flow
2. An internal valve which incorporates the
   excess-flow and a positive shutoff

5.1.2 Student Book ? 2005 Propane Education Research Council Page 8
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Figure 7. Excess Flow Valve and Manual Valve for
Liquid Withdrawal
5.1.2 Student Book ? 2005 Propane Education Research Council Page 8
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5.1.2 Student Book ? 2005 Propane Education Research Council Page 9
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Emergency shutdown systems
5.1.2 Student Book ? 2005 Propane Education Research Council Page 9
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Manual valves
5.1.2 Student Book ? 2005 Propane Education Research Council Page 10
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Tank Fittings
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Optional Gauges (Required for tanks larger than
4000 Gallons)
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Time to See If You Got the Key Points of This
Module

• Complete the Review on pages 13-14.
• See if you are ready for the Certification Exam
  by checking off the performance criteria on page
  15.

5.1.? Student Book ? 2005 Propane Education Research Council Pages 13-15