4.1.2 CETP Instructor PowerPoint Template

1
Determining System Load and Customer Demand
Profile
Designing a satisfactory gas distribution system
for a new customer installation, or modifying an
existing installation, requires the propane
marketer to understand the operating
characteristics and demand of the gas appliances,
the customers life style and the gas appliance
operating profile

• In this module you will learn to
• Identify fundamental considerations for designing
  vapor distribution systems
• Determine the customer appliance use profile
• Identify possible gas appliance system design
  problems

4.1.2 Student Book ? 2004 Propane Education Research Council Page 1
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Fundamentals in Designing Vapor Distribution
Systems
4.1.2 Student Book ? 2004 Propane Education Research Council Page 1
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Fundamentals in Designing Vapor Distribution
Systems

• Proper vapor distribution system design must meet
  two fundamental requirements
• Propane storage containers must supply adequate
  volumes of fuel gas vapor under the reasonably
  anticipated operating conditions of the gas
  appliances.
• Pressure regulators and distribution lines must
  be sized to meet the total gas appliance system
  load without fuel gas vapor pressure and volumes
  dropping below appliance manufacturer minimum
  input specifications with all appliances
  operating at full load demand.

4.1.2 Student Book ? 2004 Propane Education Research Council Page 1
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Fundamentals in Designing Vapor Distribution
Systems
Figure 1. Components of a Vapor Distribution
System and Fundamental Design Considerations
4.1.2 Student Book ? 2004 Propane Education Research Council Page 2
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NFPA Code Requirements
Requirements for gas piping system design are
located in Chapter 5 of the 2002 edition of NFPA
54, National Fuel Gas Code.
5.4.2.1 The volume of gas to be provided shall be determined directly from the manufacturers input ratings of the gas appliances served.
5.4.2.2 The total connected hourly load shall be used as the basis for pipe sizing, assuming all equipment is operating at full capacity simultaneously.
4.1.2 Student Book ? 2004 Propane Education Research Council Page 2
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NFPA Code Requirements
5.4.4 The design pressure loss in any piping system under maximum probable flow conditions. shall be such that the supply pressure at the appliances is greater than the minimum pressure required for proper appliance operation.
5.1.2 When additional gas appliances are connected to a gas piping system, the existing piping shall be checked to determine whether it has adequate capacity. If inadequate, the existing system shall be enlarged as required, or separate gas piping of adequate capacity shall be provided.
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Determining the Customer Appliance Use Profile
Figure 2a. Example of a Gas Customer Profile
(Front)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 3
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Determining the Customer Appliance Use Profile
Figure 2a. Example of a Gas Customer Profile
(Front)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 3
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Determining the Customer Appliance Use Profile
Figure 2a. Example of a Gas Customer Profile
(Front)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 3
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Determining the Customer Appliance Use Profile
Figure 2b. Example of a Gas Customer Profile
(Reverse Side)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 4
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Determining the Customer Appliance Use Profile
Figure 2b. Example of a Gas Customer Profile
(Reverse Side)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 4
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Determining the Customer Appliance Use Profile
Figure 2b. Example of a Gas Customer Profile
(Reverse Side)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 4
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Determining the Customer Appliance Use Profile

• Special system design requirements may include
• Large gas appliance system demand
• Year-round use of both indoor and outdoor gas
  appliances
• Large family and group social functions in
  severely cold weather
• Customer desire for concealed propane supply
  containers
• High-altitude appliance operation
• Concealed piping or tubing runs, or kitchen
  equipment installed in island locations
• Critical service factors

4.1.2 Student Book ? 2004 Propane Education Research Council Page 4
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Determining the Customer Appliance Use Profile
Figure 3a. Example of a Gas Customer Profile
(Front)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 5
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Determining the Customer Appliance Use Profile
Figure 3a. Example of a Gas Customer Profile
(Front)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 5
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Determining the Customer Appliance Use Profile
Figure 3a. Example of a Gas Customer Profile
(Front)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 5
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Determining the Customer Appliance Use Profile
Figure 3b. Example of a Gas Customer Profile
(Reverse Side)
4.1.2 Student Book ? 2004 Propane Education Research Council Page 6
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Possible Gas Appliance System Design Problems
Figure 4. Example of Installation Planning
Checklist
4.1.2 Student Book ? 2004 Propane Education Research Council Page 7
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Time to See If You Got the Key Points of This
Module

• Complete the Review on page 8.
• See if you are ready for the Certification Exam
  by checking off the performance criteria on page
  9.

4.1.2 Student Book ? 2004 Propane Education Research Council Pages 8 9