Guide to engineers in the design & installation of low or intermediate pressure nonreinforced concrete irrigation pipelines & for the preparation of detailed specifications for a particular installation. Restricted to pipelines with vents or stands open to the atmosphere or closed pipelines operating at less than 6 m (20 ft) of head. Systems designed and/or installed under this Standard shall utilize pipe conforming to one or more of the following types of nonreinforced concrete irrigation pipe: Pipelines with mortar joints; Pipelines with rubber gasket joints; Cast-in-place pipelines.