Transcript MODULE 1:

2011 PLANT OPERATIONS
MODULE 2
Operate the Propane Liquid Supply System
2011 PLANT OPERATIONS
Module 2 – Operate the Propane Liquid Supply System
In this module, you will learn to:
 Identify and safely open the valves in the liquid supply
lines leading from the storage tanks.
 Avoid unintentionally closing (slugging) an excess flow
valve.
 Reopen an excess flow valve to resume liquid delivery.
 Detect suspected contamination of stored propane.
 Avoid potential problems when operating with multiple
storage tanks of different diameters.
 Know when it is necessary to shut down and secure the
liquid supply system, and follow the proper procedure
to do so.
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LESSON 1
Open the Liquid Supply Line
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Open the Liquid Supply Line
LESSON 1
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Liquid Outlet Valve Configurations
LESSON 1
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Emergency Shutoff Mechanisms
ESV must be capable of being closed.
 Automatically by thermal (fire) actuation.
 Manually from a remote location.
 Manually at the valve.
Open Position
Closed Position
LESSON 1
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Emergency Shutoff Mechanisms
Mechanical Latch
LESSON 1
Pneumatic Latch
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Emergency Shutoff Mechanisms
Fusible Elements – Built into ESV
LESSON 1
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Emergency Shutoff Mechanisms
Fusible Elements – Remote
Manual
Close
LESSON 1
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Emergency Shutoff Mechanisms
Remote Open and Close
ESV with
Pneumatic Operator
Internal Valve with
Pneumatic Operator
LESSON 1
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Emergency Shutoff Mechanisms
A bulk plant must have an emergency
shutdown system with:
 A mechanical or pneumatic connection to
the internal valve, or to an approved
ESV, in the liquid line in each storage
tank.
 One or more emergency remote
shutdown stations, each with a
mechanism to manually close storage
tank shutoff valves.
 An emergency remote shutdown station
must be located between 25 and 100
feet from the transfer location.
LESSON 1
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Operating a Manual Shutoff Valve
Multi-turn
Globe valves
Gate valves
90° turn
Ball valves
LESSON 1
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Precautions Before Opening Valves
LESSON 1
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Open the Supply Line to the Pump
LESSON 1
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Discovery – What’s in Your Plant?
LESSON 1
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Lesson 2
How an Excess Flow Valve Works in a Liquid Line
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Lesson 2 – How an Excess Flow Valve Works in a Liquid
Line
 Purpose - limit the flow of propane in the event of
an unsafe condition.
– Hose rupture or separation.
– Pipe breakage.
– Someone opening a hose end valve not
connected to a container.
 Found at:
– Liquid outlet of propane storage tank.
– Where the pipe diameter is reduced.
– Sometimes at transfer points.
LESSON 1
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What Makes it Close?
LESSON 1
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How to Open It
 Close the closest downstream manual
valve.
 Wait patiently for the excess flow valve to
open - you may hear it click.
 Open the valve SLOWLY to avoid a
sudden increase in flow.
LESSON 2
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Check for Understanding
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Lesson 3
Detecting Contamination in Stored Propane
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Lesson 3 – Detecting Contamination in Stored Propane
Potential hazards include:
 Excessive pressure - discharge through pressure
relief valve.
 Malfunction of fuel systems in propane-powered
vehicles.
 Incomplete combustion in a forklift engine,
contaminating air inside a plant.
 Health risk from release of contaminants into the
atmosphere.
Temperature/Pressure
Relationship
LESSON 3
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Temperature/Pressure Relationship for Propane
 Exact composition may vary.
 Pressure at any given temperature is
predictable for a particular composition with a
particular specific gravity.
LESSON 2
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Other Clues
 Abnormal odor
 A frost line on the container
 Corrosion on brass or other yellow metals
 Oily material appearing when a hose is
disconnected.
LESSON 2
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Lesson 4
Operate with Multiple Storage Tanks of Different Diameters
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Lesson 4 – Operate with Multiple Storage Tanks of Different
Diameters
Filling Levels Aligned
LESSON 3
Filling Levels Not Aligned
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Check Your Understanding
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Lesson 5
Shut Down and Secure the Liquid Supply System
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Lesson 5 – Shut Down and Secure the Liquid Supply System
 When is Shutdown Necessary?
 Shutdown Procedure:
– Make sure hose end valves are closed with dust
caps or plugs installed.
– Close liquid valve at storage tank outlet.
– Close liquid and vapor return valves.
– Secure transfer hoses.
– Close and lock cabinets, gates or valves.
LESSON 3
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Case Study – Securing the Liquid Supply System
LESSON 3
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Summary
 Liquid supply systems vary. All must have valves that serve the following
functions:
–
–
–
–
Excess flow valve.
Emergency shutoff valve.
Manual shutoff valve.
An internal valve may serve all three functions.
 An ESV must be capable of manual, remote and thermal shutoff.
 A pump should have a bypass line to return excess liquid to the storage tank.
 Always open the last valve slowly to avoid slugging an excess flow valve.
 When operating with multiple storage tanks of different diameters, extra care
is required when their maximum permitted filling levels are not aligned.
 Any time a propane liquid supply system will be left unattended it must be
shut down and secured.
LESSON 3
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