LP GAS

1
Part I II
Basic L.P. Gas
TROUBLESHOOTER
RVIA

• LP GAS
• PROPERTIES
• HANDELING
• CONTAINERS
• Types
• APPURTENANCES
• PURGING
• FILLING
• PIGTAILS
• Types
• Application
• REGULATORS
• Types
• Application
• Operation / Testing

• P.O.L. / type 1
• Types
• Application
• operation / Testing
• HOSE ASSEMBLIES
• Types
• Application
• Testing

2
OPD Cylinder Valves

• ANSI A119.2 / NFPA 1192
• 2-2.7.4 Overfilling Prevention Devices. Tanks
  shall be equipped with a listed overfilling
  prevention device. Cylinders with a 4-lb. through
  40-lb. propane capacity shall be equipped with a
  listed overfilling prevention device and a CGA
  791 (Type 1 , 1- 5/16 in. Acme) outlet as
  described in Compressed Gas Association (CGA)
  V-1, Compressed Gas Cylinder Valve Outlet and
  Inlet Connections.

3
OPD Cylinder Valves

• NFPA 58
• 2.3.1.5 Cylinders with 4-lb. (1.8-kg) through
  40-lb. (18-kg) propane capacity for vapor service
  shall comply with the following
• (a) Cylinders fabricated after September 30,
  1998 , shall be equipped or fitted with a listed
  overfilling prevention device and a fixed maximum
  liquid level gauge. These devices shall be part
  of the container assembly. The length of the
  fixed maximum liquid level gauge dip tube shall
  be in accordance with 4.4.3.3.(a).
• (b) Cylinders requalified after September 30,
  1998, shall be equipped with a listed overfilling
  prevention device and a fixed maximum liquid
  level gauge prior to being filled.
• ( c ) Effective April 1, 2002, no cylinder shall
  be filled unless it is equipped with a listed
  overfilling prevention device and a fixed maximum
  liquid level gauge. The length of the fixed
  maximum liquid level gauge dip tube shall be in
  accordance with 4.4.3.3.(a).
• (d) Cylinders required to have an overfilling
  prevention device installed shall be equipped
  with a CGA connection number 791 or a CGA
  connection number 810 as described in CGA
  publication V-1.
• Exception No. 1 All cylinders used in
  industrial truck service, including forklift
  truck cylinders and cylinders identified and used
  for industrial welding and cutting gases.
• Exception No. 2 Cylinders manufactured prior to
  October 1, 1998, and designed for use in the
  horizontal orientation for which an overfilling
  prevention device is not available. Such
  cylinders shall have a label to indicate that
  they are not equipped with an overfilling
  prevention device.

4
TYPICAL SINGLE STAGE REGULATOR
DUST CAP
ADJUSTING CAP
ADJUSTING SPRING
VENT
RELIEF MECHANISM
DRIP LIP
BONNET
OUTLET PRESSURE
INLET PRESSURE
GAS
FLOW
LEVER ARM ASEMBLY
BODY
5
TYPICAL SINGLE STAGE REGULATOR
( CONTAINER VALVE ON)
GAS FLOW
6
TYPICAL SINGLE STAGE REGULATOR
( LOCK-UP POSITION)
GAS FLOW
7
TYPICAL SINGLE STAGE REGULATOR
( FLOW POSITION)
GAS FLOW
8
TYPICAL SINGLE STAGE REGULATOR
( LOCK-UP POSITION)
GAS FLOW
9
TYPICAL SINGLE STAGE REGULATOR
(RELIEF POSITION)
GAS FLOW
10
AUTOMATIC CHANGEOVER
MODEL 250
SELECTOR
DUST CAP
ADJ CAP
ROCKER
ADJ. SPRING
PRESSURE SPRING
DIAPHRAGM ASSY.
DIAPHRAGM
LEVERARM
LEVERARM ASSY.
RELIEF ASSY.
PISTON
SPRING
INDICATOR CAP
11
AUTOMATIC CHANGEOVER BOTH CONTAINERS FULL
LOCKUP POSITION
12
AUTOMATIC CHANGEOVER DRAWING FROM LEFT
CONTAINER
FLOW POSITION
13
AUTOMATIC CHANGEOVER LEFT CONTAINER
EMPTY DRAWING FROM RESERVE
MODEL 250
14
AUTOMATIC CHANGEOVER RIGHT CONTAINER
DISCONNECTED DRAWING FROM NEW SERVICE
MODEL 250