A ring‐shaped directivity pattern has been observed when an acoustical signal is transmitted from an orifice in the wall of a buried pipe when the gaseous medium in the pipe is under high pressure. This effect appears to result from a combination of conditions that are similar to those that produce jet noise patterns and acoustical streaming around an orifice. The experimental work in which these effects were measured was sponsored by the American Gas Association as part of a sonic leak‐pinpointing project.