| 摘要 |
A pipe span of a mobile irrigation system has an elongated volume displacement body contained within the interior flow passage of the span so as to occupy space that would otherwise be available for liquid flow. The displacement body is of reduced transverse dimension relative to the inside diameter of the span so as to present a flow path around the outside of the body between the latter and the sidewall of the span. The length of the body selected for use depends upon the desired amount of volume to be displaced. Alternative embodiments of the displacement body include a tubular member with closed, opposite ends, a thin-walled tubular member provided with a rigid foam insert for strength, a thin-walled tubular member with internal stiffeners, and a rigid foam member devoid of a surrounding thin-walled tubular member.
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