| 摘要 |
An insulated watering system is provided for fowl, animals or the like in which a length of pipeline is defined by several groups of watering pipes with each group of watering pipes being of a different wall thickness and having greater heat-insulating efficiency in the direction of water flow. The pipes are preferably formed from foamed polymeric/copolymeric material, such as polyvinylchloride, and each includes an interior cylindrical closed cell core sandwiched between noncellular skins or plies. The exterior diameters of all watering pipes are identical, but the interior diameters of the various groups decrease in the direction of water flow. In this fashion, a larger wall thicknesses of the pipes effectively insulate the lesser volume of water flowing through the water line along downstream portions thereof.
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