3.6.5 CETP Instructor PowerPoint Template

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3.6.5 CETP Instructor PowerPoint Template

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3.6.5 Unloading Propane Railcars Using the Plant Compressor Unloading propane railcars requires well-trained and qualified persons. They must be knowledgeable in ... – PowerPoint PPT presentation

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Title: 3.6.5 CETP Instructor PowerPoint Template


1
  • Unloading propane railcars requires well-trained
    and qualified persons. They must be
    knowledgeable in handling hazardous materials and
    understand the bulk plant and its procedures.
  • In this module you will learn to identify
  • Regulatory requirements relating to railcar
    unloading
  • Safety precautions related to the transfer of
    propane from railcars
  • Positioning the railcar/spotting procedures
  • and check the valves and fittings used in
    unloading the railcar
  • Procedures for unloading the railcar
  • Unloading and releasing procedures

3.6.5 Student Book ? 2004 Propane Education Research Council Page 1
2
Identify regulatory requirements relating to
railcar unloading
DOT regulations require employers to train and
test every employee directly involved in the
transportation of hazardous materials. This
requirement also includes personnel who inspect,
load or unload pressurized railcars used in
LP-gas transportation.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 1
3
Identify regulatory requirements relating to
railcar unloading
  • Some specific regulations that are pertinent
    include
  • 49 CFR 173.31, Qualifications, Maintenance, and
    Use of Railcars
  • 49 CFR, Part 172, Subparts H Training, and I
    Security Plans
  • 49 CFR, Part 174, Carriage By Rail, Subparts A, B
    and C
  • 49 CFR Part 179, Specifications for Railcars and
    179.7 Quality Assurance Program
  • 49 CFR 180.509, Requirements for Inspection and
    Test of Specification Railcars

3.6.5 Student Book ? 2004 Propane Education Research Council Page 1 2
4
Identify regulatory requirements relating to
railcar unloading
  • Other regulations or standards adopted by
    reference that may apply
  • Include
  • AAR, Manual of Standards and Recommended
    Practices, M-1002, Appendix C, Railcar Marking
    Requirements
  • AAR, Field Manual Rules, 70, 88, 89, and 90
  • CGSB 43.147-97
  • Abbreviations
  • AAR Association of American Railroads
  • CGSB Canadian General Standards Board

3.6.5 Student Book ? 2004 Propane Education Research Council Page 1 2
5
Identifying Safety Precautions Related to the
Transfer of Propane From Railcars
  • The following are precautions that apply
  • Remove all sources of ignition from the transfer
    area before beginning the railcar unloading
    operation.
  • A minimum 18 pound BC fire extinguisher must be
    accessible to and within the work area of the
    unloading operator. NFPA 10 states an
    extinguisher must be conspicuously located where
    they will be readily accessible and immediately
    available, preferably along normal paths of
    travel including exits from areas.
  • Wear heavy vinyl gloves, eye protection, and
    other appropriate personal protective equipment
    (PPE) during the entire unloading operation.
  • Never drag a hose connector or hose-end valve
    across the ground, railcar walkway or riser
    platform.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 2
6
Identifying Safety Precautions Related to the
Transfer of Propane From Railcars
  • The following are precautions that apply
  • Never carry a valve by the handwheel or operating
    lever. Always carry it by the valve body with
    the outlet pointed away from the body.
  • Never leave the transfer operation unattended.
    If you must leave the area for any reason except
    an emergency, always stop the compressor, close
    all valves, and disconnect and stow all transfer
    hoses.
  • Be sure of the following conditions
  • railcar wheels are chocked
  • railcar brakes are set
  • derail is set to the derailing position
  • railcar and spur entrance(s) are flagged
  • rail car is inspected
  • product identity and quality is verified before
    making hose connections

3.6.5 Student Book ? 2004 Propane Education Research Council Page 2
7
Identifying Safety Precautions Related to the
Transfer of Propane From Railcars
  • The following are precautions that apply
  • If a leak or fire occurs during the transfer
    operation, close the plant emergency shutoff
    valves (ESVs) from a remote emergency shutdown
    station, and shut down the compressor
    immediately.
  • Do not unload a railcar with obvious mechanical
    defects or damage.
  • Do not stand or place any body part directly
    above the slip tube (gauge rod) when using
    itinternal pressure may force the rod upward
    with considerable force and cause severe injury.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 3
8
Identifying Safety Precautions Related to the
Transfer of Propane From Railcars
3.6.5 Student Book ? 2004 Propane Education Research Council Page 3
9
Identifying Positioning the Railcar and Spotting
Procedures
  • Inspect the Tank Car
  • Attach the bill of lading to the clipboard and
    walk completely around the tank car. Check the
    tank and head shields for fresh dents or gouges,
    and structural damage. If significant damage is
    found or leaks of any kind, notify the supervisor
    at once.
  • Check the tank to be sure it is marked PROPANE or
    LIQUEFIED PETROLEUM GAS. 3.6.5.7 And carries
    FLAMMABLE GAS placards in holders on each side
    and at each end.
  • Check the tank car identification of serial
    number to make sure it matches the number shown
    on the bill of lading.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 4
10
Identifying Positioning the Railcar and Spotting
Procedures
  • Inspect the Tank Car
  • Check the deign information on the tank to be
    sure it shows one of the approved DOT design
    codes for tank cars. The markings are usually
    stenciled onto the tank immediately beneath the
    identification number, but occasionally they may
    be found stamped into the metal at the centers of
    the tank heads. In either case, they should
    specify one of the following DOT design codes
    105A-, 112A-, 112J-, 112T-, or 114A-. If the
    tank car is improperly marked or the tank
    identification number does not match the one
    shown on the bill of lading, notify the
    supervisor at once.
  • Climb the unloading riser and lower the platform
    to gain access to the dome and tank car openings.

Caution Be sure the platform is properly seated
and secured before crossing over to the tank car.
Exercise caution when climbing or working on the
riser, especially in wet or icy weather.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 4
11
Identifying Positioning the Railcar and Spotting
Procedures
  • Inspect the Tank Car
  • Examine the seal on the dome lid carefully for
    evidence of tampering. If the seal has been
    broken or tampered with in any way, notify the
    supervisor. Otherwise, clip the seal, attach it
    to the clipboard along with the bill of lading,
    and open the dome.

Caution Before opening dome, be sure that all
sources of ignition have been removed from the
area. Also, avoid creating sparks when opening
or working in the dome. If one of the fittings
is leaking, the dome may be filled with propane
vapor.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 4
12
Identifying Positioning the Railcar and Spotting
Procedures
  • Inspect the Tank Car
  • Inspect the valving inside the dome carefully for
    leaks, damage, and missing parts. Be sure all
    fittings are tightly plugged and that valves,
    operators, and gauges are free from damage that
    would create a hazard during unloading.

NOTE If there is evidence of a leak inside
the dome, locate the source and correct if
possible. Generally, leaks from valve openings
can be stopped by fully closing the valve. Leaks
from the packing on the slip tube gauge or on
valve operators can be corrected by tightening
the packing nut with an adjustable wrench. All
other leaks-from the relief valve, the flanges of
liquid or vapor valves, or any other source that
communicates directly with the inside of the
tank- should be reported the supervisor
immediately and noted on the bad order tag
enclosed in the dome. Never attempt to unload a
tank car if it has a leak that cannot be
corrected.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 4
13
Identifying Positioning the Railcar and Spotting
Procedures
  • Inspect the Tank Car
  • Inspect the safety appliances such as hand
    brakes, running boards, and handrails

Caution Keep eyes, face and other parts of the
body away from the relief valve opening when
working in the dome.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 5
14
Identifying Positioning the Railcar and Spotting
Procedures
  • Gauge and Test the Contents of the Tank Car
  • In order to sniff test and gauge the contents
    of the tank car
  • Conduct a sniff test on the propane by quickly
    opening and closing the sampling valve to vent a
    small amount of liquid to the atmosphere. If the
    presence of odorant cannot be detected or if
    large amounts of water appear at the valve
    opening during the sniff test, notify the
    supervisor before continuing the operation.
  • Check for leaks around the plug on the
    thermometer well, then remove the plug with a
    wrench.

Caution If propane begins to escape around the
plug threads, retighten the plug and fill out a
bad order tag. DO NOT REMOVE THE PLUG.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 5 6
15
Identifying Positioning the Railcar and Spotting
Procedures
  • Gauge and Test the Contents of the Tank Car
  • In order to sniff test and gauge the contents
    of the tank car
  • Check the fluid level in the thermometer well.
    If necessary, top up the well with antifreeze
    or light oil (Do not use water). Then carefully
    lower a glass-tube thermometer in the well for at
    least ten minutes, then withdraw it just far
    enough to read the scale.
  • Record the reading and repeat the process to
    check the accuracy of the first reading. Record
    the final result on the bill of lading or the
    company unloading form.
  • Replace and retighten the thermometer well plug.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 5 6
16
Identifying Positioning the Railcar and Spotting
Procedures
  • Gauge and Test the Contents of the Tank Car
  • In order to sniff test and gauge the contents
    of the tank car
  • Carefully remove the threaded cover from the slip
    gauge assembly
  • If possible, correct leaks by fully closing the
    bleeder valve on the gauge and/or tightening the
    packing nut at the bottom of the slip tube with a
    wrench. If the leak continues, notify the
    supervisor

CautionIf propane begins to escape around the
threads or the cover binds as it is unscrewed, do
not remove it the rest of the way unless the leak
can be controlled for sure when the cover is
fully removed.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 6
17
Identifying Positioning the Railcar and Spotting
Procedures
  • Gauge and Test the Contents of the Tank Car
  • In order to sniff test and gauge the contents
    of the tank car
  • Push down firmly on the slip tube and release the
    locking bar. Then, slowly release the brake and
    allow the slip tube to rise two to three feet.
    Re-engage the brake. Never use any tools to pry
    or pull up the slip tube. If the slip tube is
    difficult to release, apply a small amount of
    light oil to the tube and twist the tube from
    side to side as it is raised. If it continues to
    stick, loosen the packing nut until the slip tube
    moves freely.

Caution All slip tubes are under high pressure
and can cause serious injuries if allowed to
shoot out suddenly or unexpectedly. Keep a firm
grip on the gauge at all times and assume a
position so that head and body are well away from
the gauge.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 6
18
Identifying Positioning the Railcar and Spotting
Procedures
  • Gauge and Test the Contents of the Tank Car
  • In order to sniff test and gauge the contents
    of the tank car
  • Open the bleeder valve slowly until a mist of
    propane liquid (i.e., white mist) vents from the
    valve. Continue raising the slip tube until the
    vapor vents from the bleeder valve. Then slowly
    lower the tube again until liquid just begins to
    vent from the bleeder valve. At this point, the
    bottom of the slip tube is in contact with the
    surface of the liquid in the tank car. Apply the
    slip tube brake and read the outage on the slip
    tube directly opposite the pointer. Repeat the
    measurement at least twice to be sure it is
    correct. Record the final reading on the bill of
    lading or the company unloading form.
  • Convert the slip tube reading to gallons, using
    the strapping table for the tank car. Subtract
    the outage in gallons from the water capacity of
    the tank car and record the result on the company
    unloading form.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 6 7
19
Identifying Positioning the Railcar and Spotting
Procedures
  • Gauge and Test the Contents of the Tank Car
  • In order to sniff test and gauge the contents
    of the tank car
  • Correct the tank car gallonage for temperature
    and specific gravity by multiplying it by the
    appropriate volume correction factor. The
    correction factor can be obtained from the
    company unloading forms or a chart attached to
    the strapping table.
  • Compare the result to the gallonage recorded on
    the bill of lading. Follow company procedures
    for reporting discrepancies.
  • Close the bleeder valve on the slip tube tightly,
    lower the gauge, and lock it into place. Replace
    the gauge assembly cover.
  • Once these tests and inspections are complete and
    you are assured there are no leaks or tank car
    damage that would cause the car to be rejected,
    the preparation to unload can continue.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 6 7
20
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
Figure 1. The Manway Cover
3.6.5 Student Book ? 2004 Propane Education Research Council Page 7
21
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
Figure 2. Alternate Railcar Valves and Fittings
Arrangement
3.6.5 Student Book ? 2004 Propane Education Research Council Page 8
22
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
Courtesy union railcar and BP
Figure 3. Side View and Top View of Valves and
Fittings
3.6.5 Student Book ? 2004 Propane Education Research Council Page 8
23
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
The railcar fittings in Figures 2 and 3 are
further explained in the cut-away view to the
right (Figure 4.). This illustration shows how
the various valves and fittings interact with the
interior of the cargo tank.
Figure 4. Cut-Away View of ManwayAnd Tank
Interior
3.6.5 Student Book ? 2004 Propane Education Research Council Page 9
24
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Liquid and Vapor Connections
  • The outlets of the two liquid valves face the
    ends of the railcar
  • Thermometer Well
  • Sampling Valve
  • The sampling valve is a small manual shutoff
    valve attached to a long open tube that leads to
    the bottom of the railcar. It is used to test
    the contents of the railcar for odorization, the
    presence of water or other impurities, and, in
    rare cases, to measure the specific gravity of
    the propane. It can also be used during the
    unloading operation to determine whether any
    propane liquid remains in the bottom of the tank

3.6.5 Student Book ? 2004 Propane Education Research Council Page 10
25
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Slip Tube Gauge
  • Most railcars are equipped with a slip tube gauge
    (Figure 5), which is used to measure the contents
    of the railcar. The slip tube gauge is similar
    to a fixed maximum liquid level gauge. However,
    the dip tube is not fixed, but can be moved up
    and down in the gauge housing to

Figure 5. Slip Tube Gauge
3.6.5 Student Book ? 2004 Propane Education Research Council Page 10
26
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Pressure Relief Valves
  • Never tamper with it and never work directly over
    it
  • Unloading Risers
  • To gain access to the top openings in railcars,
    most plants use an unloading riser (also known as
    a tower).

3.6.5 Student Book ? 2004 Propane Education Research Council Page 10
27
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Identifying Procedures for Unloading the Railcar
  • Gauge Contents of Railcar
  • A series of graduated markings on the slip tube
    indicates the distance in inches and feet from
    the top of the tank to the surface of the liquid.
    This is commonly referred to as the "outage" of
    the railcar.

Figure 6. Portion of a Railcar Outage Table
3.6.5 Student Book ? 2004 Propane Education Research Council Page 11
28
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Determine the Maximum Amount of Propane That can
    be
  • Transferred to the Plant Bulk Storage Tanks
  • To determine the amount of propane each plant
    tank will hold safely
  • Gauge the contents of the plant storage tank with
    the rotary or float gauge installed in the tank
    head. Record the reading on the company form or
    on a worksheet.
  • Using the temperature and specific gravity of the
    propane in the railcar, determine the maximum
    permitted filling level for the plant tank(s).
    Record the result on the worksheet.
  • Subtract the gauge reading from the maximum
    permitted filling level.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 12
29
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Determine the Maximum Amount of Propane That can
    be
  • Transferred to the Plant Bulk Storage Tanks
  • To determine the amount of propane each plant
    tank will hold safely
  • Calculate the maximum amount of propane that can
    be added to the storage tank by multiplying the
    difference between the two numbers by the water
    capacity of the tank in gallons. If, for
    example, the gauge on a 30,000 gallon storage
    tank shows that it is 40 full and its maximum
    permitted filling density at the present
    temperature is 85, 45 X 30,000 or 13,500
    gallons can safely be added to the tank.
  • If there is more propane in the railcar than the
    plant tank(s) will hold safely, notify your
    supervisor.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 12
30
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Connect Liquid and Vapor Hoses Between the
    Railcar and the
  • Unloading Riser
  • To gain access to the top openings in railcars,
    most plants use an unloading riser, also known as
    a tower. (Figure 7)

Figure 7. Railcar Riser with Emergency Shutoff
Valves
3.6.5 Student Book ? 2004 Propane Education Research Council Page 12 13
31
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Connect Liquid and Vapor Hoses Between the
    Railcar and the
  • Unloading Riser
  • During unloading operations, a railcar unloading
    nipple (also known as a stub)essentially a
    straight section of schedule 80 threaded
    pipingis inserted through the holes in the side
    of the dome and screwed into the valve outlets
    after the valve shipping plugs are removed.
    (Figure 8.)

Figure 8a. Stub Connected toVapor Valve
Figure 8b. Connecting Hose toStub in Liquid
Valve
3.6.5 Student Book ? 2004 Propane Education Research Council Page 13
32
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Connect Liquid and Vapor Hoses Between the
    Railcar and the
  • Unloading Riser
  • In order to complete this step
  • Check the manual shutoff valves on the railcar
    liquid and vapor connections to make sure they
    are fully closed. Then carefully remove the
    plugs
  • Install unloading stubs or ESVs in the liquid
    and vapor valves. Thread the stubs or ESVs into
    the valve opening until they are handtight. Then
    tighten them with the appropriate wrench until
    they are securely seated. Once installed, open
    the ESVs in accordance with company procedures.

Caution Propane may vent around the plug threads
for a short time. Wear heavy vinyl safety gloves
throughout the operation and keep face and other
parts of the body away from the valve opening.
If propane continues to vent around the plug
threads, the manual shutoff valve may be faulty.
Retighten the plug and notify the supervisor. If
the chains on the plugs are broken or missing,
store the plugs in a safe place.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 14
33
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Connect Liquid and Vapor Hoses Between the
    Railcar and the
  • Unloading Riser
  • In order to complete this step
  • Remove the dust caps from the connectors on the
    riser hoses. Check the connectors to be sure
    they are clean. Check the O-rings on the ESV or
    unloading stub to be sure they are in good
    condition. If necessary, clean the connectors
    with a rag and replace worn, flattened, or
    damaged O-rings.
  • Connect the hoses to the railcar stubs or ESVs by
    spinning on the ACME connectors until they are
    handtight. As the connectors are tightened, move
    the hose or hose-end valve up and down slightly
    to prevent the thread from seizing. When each
    connection is handtight, tighten it an additional
    1/8 turn with a hook spanner. NEVER POUND ON THE
    CONNECTOR WITH A WRENCH OR OTHER DEVICE.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 14
34
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Connect Liquid and Vapor Hoses Between the
    Railcar and the
  • Unloading Riser
  • In order to complete this step
  • Check the ESVs at the riser by opening and
    closing them according to plant test procedures.
    Be sure the remote operators are working properly
    and that all fusible links are intact. If the
    ESVs will not operate properly, do not continue
    the transfer operation. If possible, correct the
    problem. Otherwise, notify your supervisor.
  • Check each connection for leaks by opening and
    closing the manual shutoff valve at the railcar
    to charge the connection with propane.

Note If using ESV's instead of unloading
stubs, open the ESV to charge and test the hose
connection. If there are any connection leaks,
close all valves and retighten the connection.
If the leak continues, notify your supervisor.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 14 15
35
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Unload the Railcar
  • A qualified person must be present during the
    entire transfer operation to handle emergencies
    and monitor the condition of the transfer system.
    If leaving the area, find someone as a
    replacement who has a working knowledge of the
    transfer equipment and plant emergency
    procedures. Otherwise, shut down the operation
    until returning.
  • If a leak or fire develops at any time during the
    operation, close all ESV's immediately and stop
    the compressor. Then follow company procedures
    to handle the problem. Be alert throughout the
    operation for signs of erratic compressor
    operation. If a problem develops, shut down the
    operation and correct it before continuing.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 15
36
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Unload the Railcar
  • An excess-flow valve in an eduction valve or the
    plant tank may stick or freeze shut. As a
    result, it will not reopen when the pressure is
    equalized across the valve. If this happens
    during unloading operations, reopen the valve by
    applying compressor discharge pressure to the
    stuck excess-flow valve.
  • If the excess-flow valve is in a vapor
    connection, it is reopened simply by reversing
    the four-way valve and restarting the compressor

3.6.5 Student Book ? 2004 Propane Education Research Council Page 15
37
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • To unload the railcar
  • Open the vapor valves at the riser. Then, open
    all valves in the liquid line, starting at the
    manual shutoff valves on the railcar and working
    toward the plant storage tank(s). Allow as much
    liquid as possible to drift between the two
    tanks, then open the remaining valves in the
    vapor line.
  • Check to be sure the four-way valve and the plant
    valves have been set so the compressor will
    remove vapor from the plant storage tank and
    discharge it into the railcar. Figures 10 and 11
    illustrate the compressor 4-way valve and piping
    positions for unloading in a typical bulk plant.
    Your plant piping may be different. Be sure you
    verify the proper valve positions and operating
    procedures for your plant.

Note Open valves slowly to prevent excess-flow
valves from slugging
3.6.5 Student Book ? 2004 Propane Education Research Council Page 16
38
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
Figure 10. 4-Way Valve Positions
Figure 9. Compressor and Bulk Plant Connections
and Valves
Figure 11. Operation of Valves for Cargo tank
Unloading
3.6.5 Student Book ? 2004 Propane Education Research Council Page 16
39
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • To unload the railcar
  • Start the compressor and check the pressure
    gauges for excessively high exhaust or
    excessively low intake pressure. If either
    occurs, stop the compressor and correct the
    problem before continuing. Check the sight glass
    or flow indicator to make sure liquid is flowing
    through the system.
  • When the plant storage tank reaches its maximum
    permitted filling level or the railcar is empty,
    close all valves in the liquid line and stop the
    compressor.

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40
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • To unload the railcar
  • Reverse the four-way valve and adjust the plant
    piping manifold so the compressor will withdraw
    vapor from the railcar and force it through the
    liquid space of the plant storage tank. (Figures
    12b and 12c.) Restart the compressor and check
    the pressure gauges for excessively high
    discharge or excessively low intake pressure. If
    either occurs, shut down the compressor and
    correct the problem before continuing.
  • At the end of the vapor recovery operation, close
    all valves in the vapor line and shut down the
    compressor. Some plants shut down the compressor
    when the discharge pressure rises to four times
    the intake pressure. Others stop vapor recovery
    operations when the intake pressure drops to 50
    psi in the summer or 30 psi in the winter. Under
    some conditions plants will also shut down their
    compressors, if the intake pressure drops less
    than 10 psi during 15 minutes of operations.
    Check with your supervisor for the proper
    guidelines to follow

3.6.5 Student Book ? 2004 Propane Education Research Council Page 16 17
41
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
Figure 12b. 4-Way Valve Positions
Figure 12a. Compressor and Bulk Plant
Connections and Valves
Figure 12c. Operation of Valves for Cargo Tank
Vapor Recovery
Note Monitor the liquid gauges on the plant
storage tank(s) carefully to prevent overfilling
3.6.5 Student Book ? 2004 Propane Education Research Council Page 17
42
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
To finish the operation and prepare the railcar
for return
  • Open the sample valve. If vapor is released, the
    railcar is totally unloaded. If liquid escapes,
    it may not be fully unloaded. Resume unloading
    operations until the railcar is totally
    un-loaded.
  • Close all railcar discharge valves, ESVs and
    transfer hose-end valves.
  • Vent the propane trapped between valves, stubs
    and hose couplings. When the connections are
    fully de-pressurized, disconnect the transfer
    hoses.
  • Remove the railcar unloading nipples, or stubs,
    that are screwed into the railcar valve outlets

Figure 13. Checking the Sample Valve
3.6.5 Student Book ? 2004 Propane Education Research Council Page 18
43
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
To finish the operation and prepare the railcar
for return
  • Replace all railcar valves openings and tighten
    as appropriate. (Figures 14 and 15)

Figure 14a. Preparing Plug Threads
Figure 14b. Installing Plug in Slip Tube Gauge
Figure 15. Tightening Plug in Discharge Valve
3.6.5 Student Book ? 2004 Propane Education Research Council Page 18 19
44
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
To finish the operation and prepare the railcar
for return
  • Replace and secure all covers over fittings.
    (Figure 16)
  • Check to be sure there is no liquid left in the
    railcar by partially opening the sampling valve
  • Bleed down and disconnect the hoses at the riser.
    Replace all dust caps and store the hoses
  • Remove the unloading stubs or ESVs from the
    railcar, and replace the plugs in the liquid and
    vapor valve openings

Figure 16. Replacing Fitting Cover
Caution Never disconnect any hose until the
propane trapped in the connection has been safely
bled off.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 19
45
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
Identifying Unloading and Releasing Procedures
  • If any railcar defects were found during the
    unloading operation, complete the Bad Order Tag
    (Figure 17) and attach it to one of the liquid
    education valves.
  • Lower the dome cover and secure it appropriately.
  • Stow all transfer hoses and fittings and raise
    the unloading riser platform to its stored
    position

NOTE The same defect(s) must be reported in the
Railcar Return Form.
Figure 17. Bad Order Tag
3.6.5 Student Book ? 2004 Propane Education Research Council Page 20
46
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • Identifying Unloading and Releasing Procedures
  • Remove and store the warning signs, chock blocks
    and reset the derail (when used) from the
    derailing position. (Figure 18)

Figure 18a. Removing Chocks
Figure 18b. Stowing Warning Sign and Resetting
Derail
NOTE DO NOT release the hand brake on the
railcar. This will be done by railroad personnel
when the railcar is picked up.
3.6.5 Student Book ? 2004 Propane Education Research Council Page 20
47
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
Identifying Unloading and Releasing Procedures
  • Verify that all placards are in good shape and in
    place. (Figure 19)
  • Take an extra look around the railcar and
    unloading site to make sure everything is safe
    and secure.
  • Complete the Railcar Return Instructions Form and
    deliver the form to the rail carrier
    representative.

Figure 19. Replacing Damaged Placard
3.6.5 Student Book ? 2004 Propane Education Research Council Page 21
48
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • The Railcar Return Instruction
  • Form must be prepared, signed
  • and presented to the rail carrier
  • representative for their signature
  • before the railcar is released.

Figure 20. Sample Railcar Return Instructions
Form
3.6.5 Student Book ? 2004 Propane Education Research Council Page 22
49
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • While completing the Railcar Return Instructions
    Form, the propane
  • marketers representative should
  • Verify the date entry when the company was
    notified of the railcars arrival, when it was
    received on the siding, and when unloading was
    completed.
  • On the Company Copy of the railcar return form,
    enter the date when the car was removed from the
    siding. Retain it in company records.
  • List in the remarks section any defect(s) that
    were present when the car was received
  • Determine if any defect(s) occurred or was
    discovered during the time the railcar was on the
    siding and being unloaded. If so, describe it in
    the remarks section and attach a copy to the Bad
    Order Tag.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 22 23
50
Identifying and Checking the Valves and Fittings
Used in Unloading the Railcar
  • While completing the Railcar Return Instructions
    Form, the propane
  • marketers representative should
  • Verify other information preprinted on the form,
    sign and date it.
  • Deliver the Railcar Return Instructions Form
    personally, or by electronic means to the
    railroad agent, for their signature and date.
    3.6.5.31 Sometimes a bulk plant employee will
    notify the railroad company representative by
    telephone or fax, and hold the form for signature
    until the rail car is picked up.
  • From the time the railcar return form is used to
    notify the railroad company agent that the car is
    ready to be picked up, until the time it is
    actually removed from the siding, the propane
    marketer must provide a safe and secure
    environment for the railcar.

3.6.5 Student Book ? 2004 Propane Education Research Council Page 22 23
51
Time to See If You Got the Key Points of This
Module
  • Complete the Review on page 24 - 27.
  • See if you are ready for the Certification Exam
    by checking off the performance criteria on page
    28 - 30.

3.6.5 Student Book ? 2004 Propane Education Research Council Pages 24 - 30
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