Transcript 2.3.8 CETP Instructor PowerPoint Template

2.3.8
Performing Pre-Unloading Cargo Tank
Emergency Discharge System & Delivery
Hose Inspections
Inspecting the cargo tank emergency discharge system and
the delivery hose assembly before loading is essential to
the safe and efficient operation of the cargo tank motor
vehicle (CTMV).
In this module you will learn how to inspect:
(1) Transport emergency discharge system
(2) Transport delivery hose assembly and plant hose assemblies
(3) Emergency shutdown systems
2.3.8 Student Book  © 2004 Propane Education & Research Council
Page 1
Pre-Unloading Inspections
U.S. DOT regulations in 49 CFR §177.840 require the
operator of a cargo tank motor vehicle (CTMV) to
check the components of the discharge system to
assure they are in proper working order and that
connections are secure.
Components that may be readily visible during unloading are:
• The lower section of the pump
• Piping visible between the pump and other components
• Bypass valve(s)
• Liquid meter
2.3.8 Student Book  © 2004 Propane Education & Research Council
Page 1
Pre-Unloading Inspections
Components that may be readily visible during unloading are:
• Line valves and hydrostatic relief valves
• Delivery hose assembly, including couplings
• Emergency shutdown stations and controls
2.3.8 Student Book  © 2004 Propane Education & Research Council
Page 1
Pre-Unloading Inspections
Piping and Discharge System Rejection Criteria
 Any external leak identifiable without the use of instruments
(a leak that can be seen or heard)
 Loose, missing, or severely corroded bolts
 Manual stop valves that will not actuate
 Rubber hose flexible connectors with any condition listed
as a defect in the hose assembly rejection
criteria list
 Stainless steel flexible connectors with damaged
reinforcement braid
 Internal self-closing stop valves that fail to close or that
permit leakage through the valve detectable without
the use of instruments
 Severely corroded pipes or joints
Figure 1. Cargo Tank Discharge System Rejection Criteria
2.3.8 Student Book  © 2004 Propane Education & Research Council
Page 1
Pre-Unloading Inspections
Delivery Hose Assembly— All delivery hose assemblies were required
to be permanently marked with a unique identification number by July
1, 2000.
Delivery Hose Assembly Rejection Criteria
 Damage to the hose cover that exposes the reinforcement
 Wire braid reinforcement that has been kinked or flattened
so as to permanently deform the wire braid
 Soft spots when not under pressure, bulging under pressure,
or loose outer covering
 Damaged, slipping, or excessively worn couplings
 Loose or missing bolts or fastenings on bolted hose
coupling assemblies
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Pre-Unloading Inspections
Worn Reinforcement
Cut in Hose
Cut in Hose
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Pre-Unloading Inspections
Worn Coupling
Missing or Corroded
Bolts
Worn (Slipping)
Coupling
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Monthly Hose Inspections
Step 1:
Lay the hose out as straight as possible to avoid
kinking.
Step 2:
Check for cuts, abrasion, soft spots, blisters, loose
outer covers and bulges.
 Small cuts and nicks in the outer cover should
generally not be cause for hose replacement,
unless the rubber involved is loose or the
reinforcement is exposed.
Step 3:
Examine the fitting, plus 18” back from the fitting,
by pressing the hose with your thumb to detect
any soft spots or bulges.
 If they exist, remove the hose from service
immediately. This hose may be returned to service
provided the requirements of #7 are satisfied.
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Monthly Hose Inspections
Step 4:
Inspect each coupling for slippage, evidenced by
misalignment of the coupling on the hose end
and/or scored or exposed.
 Loose, missing or severely corroded bolts in
bolt-type couplings require the hose to be taken
out of service.
A hose subjected to unusual abuse, such as stretching, kinking,
or flattening by a vehicle, shall be removed from service
immediately.
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Daily Hose Inspections
The driver (or unloading operator) must also perform a “postdelivery hose check” after each product transfer operation as
required by U.S. DOT regulation 49 CFR 180.416(c). “Visually
inspect that portion of the delivery hose assembly deployed during
the unloading.”
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Inspecting Emergency Shutdown Systems
Manual Shutdown Stations— Manual shutdown stations must be
located at the front and rear of the transport trailer, diagonally
across from each other. (Typically, left front driver’s side & right
rear.)
They should be examined and operated as part of the initial pretransfer discharge system inspection for the day. If operating
levers, cables, rods, or switches are inoperable, severely corroded,
seized, or otherwise damaged, the CTMV should not be operated
until appropriate repairs are made and tested.
2.3.8 Student Book  © 2004 Propane Education & Research Council
Page 4
Inspecting Emergency Shutdown Systems
Off-Truck Remote Shutdown Devices— The operator is required to
successfully test the activation device within 18 hours prior to the
first delivery of each day. Some companies require drivers to
check the system as part of the pre-trip inspection.
Figure 5a.
Hand-Held
Off-Truck Transmitter
Figure 5b.
Receiver Antenna
Figure 5c.
Receiver/Controller
Mounted Under Seat
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Inspecting Emergency Shutdown Systems
Off-Truck Remote Shutdown Devices— For a wireless transmitter/
receiver, the person conducting the test must be at least 150 feet
from the cargo tank and will have the cargo tank in their line of sight .
Operators of CTMVs equipped with transmitter/receiver off-truck
remote shut-down systems must have the transmitter with them
at all times during the unloading operation.
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Inspecting Emergency Shutdown Systems
Note:
49 CFR §177.840(l) requires, “By January 1, 2000, each operator of a
CTMV transporting a liquefied compressed gas must carry on or
within the CTMV written emergency discharge control procedures for
all delivery operations. The procedures must describe the CTMV’s
emergency discharge control features and for a passive shutdown
capability, the parameters within which they are designed to function.
The procedures must describe the process to be followed if using a
facility-provided hose for unloading.” The operator should verify the
procedures are in fact located on the transport.
2.3.8 Student Book  © 2004 Propane Education & Research Council
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Time to See If You Got the Key Points of
This Module…
• Complete the Review on page 6.
• See if you are ready for the Certification
Exam by checking off the
performance criteria on page 7.
2.3.8 Student Book  © 2004 Propane Education & Research Council
Pages 6 & 7