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is possible to overcome these challenges, but resolution will result in increased expense. As a result of the increased expense of a side wall approach, this Phase II program approach uses a port in the center of the head. This change requires a new hardware approach in the system design. The following is a proposed hardware concept that would be compatible with the proposed tank design.

Filling and Vapor/Liquid Service Interface

The customer/user interface as seen from the surface would be virtually identical to that of a standard underground system. Figure 2 shows an example of a combination valve for ASME underground propane tanks. The example shown is by Sherwood Valve LLC (Niagara Falls, NY). The composite tank interface system was designed using this valve assembly, although other manufacturers’ designs could easily be used as well. The only modification to the standard Sherwood valve assembly is the removal of the float gauge. The horizontal entry into the tank prevents the standard float gauge from being used.

Figure 2. LPG Cluster Valve.

Riser Construction

The proposed riser can be seen in Figures 3 and 4. It consists of hardware for interfacing the valve assembly with the tank. Port connections and pressure containment is handled with use of pipe. The proposal is shown with four pipe components, which include (a) a 72 inch-long pipe

Alternative Underground Propane Tank Materials, Phase II—Final Report


September 2009 Battelle and Lincoln Composites

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