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4.2.5

4.2.5. Preparing Foundations for Cylinders & ASME Tanks. An important step in preparing for and installing a propane distribution system is assuring that each container (whether a DOT cylinder or ASME tank) has an appropriate foundation. In this module you will learn to prepare:

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4.2.5

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  1. 4.2.5 Preparing Foundations for Cylinders & ASME Tanks An important step in preparing for and installing a propane distribution system is assuring that each container (whether a DOT cylinder or ASME tank) has an appropriate foundation. • In this module you will learn to prepare: • A foundation for a DOT cylinder installation • A foundation for an ASME tank installation • A foundation for a temporary installation

  2. Preparing a Foundation for a Cylinder Installation • Three types of cylinder foundations include: • Solid Masonry Blocks • Pre-Cast Concrete Circles, Squares, or Rectangles • Concrete Poured in Place Solid Masonry Blocks— If drainage is a problem, it is a good practice to use masonry blocks and raise the cylinder(s) above the ground sufficiently to avoid water damage to the foot ring. Figure 1. Figure 2.

  3. Preparing a Foundation for a Cylinder Installation Pre-Cast Concrete Circles, Squares, or Rectangles Figure 3. Circular Pre-Cast Foundations Supporting Cylinders Concrete Poured in Place—In some areas (usually in flood zones), state and local codes require that all propane containers be installed and secured to a concrete (poured in place) foundation. Check your company standard operating procedures & state and local codes for requirements on concrete foundations.

  4. Preparing a Foundation for a Cylinder Installation Steps in Preparing the Location Figure 5. Pre-Cast Concrete Foundation

  5. Preparing a Foundation for a Cylinder Installation

  6. Preparing a Foundation for a Cylinder Installation Steps in Preparing the Location Figure 6. Preparing Foundation Using Pre-Cast Concrete Foundation

  7. Preparing a Foundation for a Cylinder Installation Steps in Preparing the Location Figure 7. Checking the Block Foundation with Carpenter’s Level

  8. Preparing a Foundation for a Cylinder Installation Steps in Preparing the Location Note: If a poured in place concrete foundation is used, the excavation will be deeper to accommodate the coarse sand and 3 to 4 inches of concrete fill.

  9. Preparing a Foundation for an ASME Tank Installation Aboveground ASME Tank Installation Horizontal ASME tanks designed for permanent installation in stationary service aboveground shall be placed on masonry or other noncombustible structural support and located on concrete or masonry foundation with tank supported as follows (NFPA 58, 2001 edition): • Where saddles are used, allow for expansion and contraction. Figure 8. ASME Storage Container with Concrete Saddles

  10. Preparing a Foundation for an ASME Tank Installation Aboveground ASME Tank Installation • Containers of more than 2,000 gallons water capacity shall be provided with concrete or masonry foundations formed to fit the tank contour or, if furnished with saddles, in compliance with NFPA 58, Table 2.2.5.1, shall be placed on flat-topped foundations. Figure 9. Typical Smaller ASME Container Aboveground Installation

  11. Preparing a Foundation for an ASME Tank Installation Aboveground ASME Tank Installation Figure 9. Typical Smaller ASME Container Aboveground Installation

  12. Preparing a Foundation for an ASME Tank Installation Aboveground ASME Tank Installation

  13. Preparing a Foundation for an ASME Tank Installation Aboveground ASME Tank Installation Note: On multi-tank installations, ensure that all foundations are level and, if the tanks have inter-connecting piping at the bottom, the maximum fill level for the tanks is at the same height.

  14. Preparing a Foundation for an ASME Tank Installation Underground ASME Tank Installation When the backfill is placed, it should be free of rocks and similar abrasives that can adversely affect the coating. Figure 10. Typical Small ASME Container Underground Installation

  15. Preparing a Foundation for an ASME Tank Installation Underground ASME Tank Installation Figure 11. Typical Large ASME Container Underground installation

  16. Preparing a Foundation for an ASME Tank Installation Underground ASME Tank Installation

  17. Preparing a Foundation for an ASME Tank Installation Underground ASME Tank Installation

  18. Preparing a Foundation for a Temporary Installation Temporary, single, portable container installations have applications such as fuel supplies, crop drying, road construction, building construction, etc. Such temporary installations shall be placed on firm earth, concrete pads, or paved surfaces, and are limited to 12 months by NFPA 58. The authority having jurisdiction be notified before starting temporary installations using containers of over 2,000 gallons individual water capacity. The surface for such temporary service must be level and if not paved, shall be clear of grass, weeds, and other combustible materials within 10 feet of the container. Flexibility must be provided for the connecting piping. Where portable containers are installed for temporary service, the outside bottom of the container must not exceed 5 feet aboveground.

  19. Time to See If You Got the Key Points of This Module… • Complete the Review on pages 12 & 13. • See if you are ready for the Certification Exam by checking off the performance criteria on pages 14 & 15.

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