The return water connections to all low-pressure, steam heating boilers supplying a gravity return heating system shall be arranged to form a loop so that the water cannot be forced out of the boiler below the safe water level. This connection, known as a "return pipe loop connection," is shown in the current edition of the ASME Code, Section IV.

Statutory Authority

§ 40.1-51.6 of the Code of Virginia.

Historical Notes

Derived from VR425-01-75 § 2.29, eff. July 1, 1974; amended, eff. November 1, 1978; July 1, 1991; September 1, 1993; Volume 35, Issue 2, eff. November 1, 2018.