Definition(s)
Telescopic (Slip) Joint Packer
A torus-shaped, hydraulically or pneumatically actuated, resilient element between the inner and outer barrels of the telescopic (slip) joint which serves to retain drilling fluid inside the marine riser.
Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards