Definition(s)
Effective Tension
Actual tension (a.k.a. “TREAL”) in the pipe minus the internal pressure times the internal area of the riser plus the external pressure times the external area of the riser TEFF = TREAL–piAi + poAo
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards
Effective Tension
Axial tension in the pipe less the internal pressure times the internal area of the pipe plus the external pressure times the outside area of the pipe.
- NOTE: Effective tension accounts for the effects of hydrostatic pressure in structural analysis of pipe.
Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards
Effective Tension
See the equation in Section 3.4.3.
Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards
Effective Tension
Axial tension calculated at any point along a riser by considering only the top tension and the apparent weight of the riser and its contents (tension positive).
- NOTE: Global buckling and geometric stiffness is governed by the effective tension.
Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Effective Tension
Tension that controls the stability of risers.
Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards