Good question Julian; Here are some reasons that many drilled wells with a sealed casing top or sealed cover require a vent: Well cap/casing vent prevents casing vacuum: On some water wells the presence of a water tight (and thus air tight ) well casing cap can mean that when the pump...
position and screened with 24-mesh or smaller durable screen, or filtered in such a manner as to prevent the entry of insects or small animals. The well vent tube should be large enough to allow the equalization of air pressure in the well; a minimum of one-half inch ...
For wells fitted with a "well cap" the cap shall have a removable plug for this piirpose. 1. Where the pump is installed directly over the casing, a watertight seal (gasket) shall be placed between the pump head and the piomp base (slab), or a water- tight seal (gasket) shall ...
A cap-to-casing adapter (166) is provided for use with a well having a well casing (12) with a top (28), having a support plate (136) that engages the top (28) of the well casing (12), and having a we