15 Years On 15 Years On 15 Years On is the eleventh studio album by the Irish folk band The Dubliners. This album was created to celebrate the band's 15th anniversary from the day they started music together. The album was released on the Chyme label in 1977. The album features 24 tracks on two records (nine of which were previously unreleased). In spite of having only nine previously unreleased tracks, it is still regarded as an original album. The group's line-up consisted of Barney McKenna, Luke Kelly, John Sheahan and Jim McCann. (Ronnie Drew and Ciarán Bourke feature on a number of
British Standard Pipe 18, although of these only 15 are included in ISO 7 and 24 in ISO 228. The size number was originally based on the "inner" diameter (measured in inches) of a steel tube for which the thread was intended, but contemporary pipes tend to use thinner walls to save material, and thus have an inner diameter larger than this nominal size. In the modern standard metric version, it is simply a size number, where listed diameter size is the major outer diameter of the external thread. For a taper thread, it is the diameter at the "gauge length" (plus/minus one