API SPEC 16R:1997 pdf download

API SPEC 16R:1997 pdf download.Specification for Marine Drilling Riser Couplings.
3.2.6 preload: Compressive bearing load developed between box and pin members at their intertice: this is accompli%hed by elastic deformation induced during makeup of the coupling.
3.2.7 rated load: A nominal applied loading condition used during coupling design. analysis, and testing based on a maximum anticipated serrice loading. Under the rated working kad. no average section stress in the riser coupling shall exceed allowable limits established in this specification.
3.2.8 rIser coupling box: The female coupling member.
3.2.9 riser joint: A section of riser pipe having ends fitted with a box and a pin, typically including integral choke, kill and auxiliary lines.
3.2.10 riser main tube: The basic pipe from which riser joints arc fabricated.
3.2.11 riser coupling pin: The male coupling member.
3.2.12 stress amplification factor (SA9: Equal to the local peak alternating stress in a component (including welds) divided by the nominal alternating stress in the pipe wall at the location of the component. This factor is used to account for the increase in the stresses caused by geometric stress amplifiers which occur in riser components.
3.3 Design Types
Coupling designs may or may not require coupling preload. Coupling design types include, but are not limited to, the types defined in this section.
3.3.1 breech-block coupling: A coupling which is engaged by partial rotation ol’ one member into an interlock with another.
3.3.2 collet-type coupling: A coupling having a slotted cylindrical element joining mating coupling members.
3.3.3 dog-type coupling: A coupling having dogs which act as wedges mechanically driven between the box and pin for engagement.
3.3.4 flange-type coupling: A coupling having two flanges joined by bolts.
3.3.5 threaded coupling: A coupling having matching threaded members to form engagement.
4 DESIGN
4.1 Service Classifications
The coupling manutacturer shall provide design mnrormation for each coupling size and model which defines load capacity rating. These data are to be based on design load (defined in 4.5) and verified by testing (specified in 8.2).
4.1.1 SIZE
Riser couplings are categoclied by sue of the riser main tube. Riser pipe outer diameter and wall thickness (or wall thickness range) for which (he coupling is desig:d shall be documented.
4.1.2 RATED LOAD
The rated loads listed in this paragraph provide a means of general classification of coupling models based on sres.s magnitude caused by applied load, To qualify for a particular rated load, neither calculated nor measured stresses in a coupling shall exceed the allowable stres.s limits of the coupling material when subjected to the rated load. The allowable material stresses are established in 4.6.
The rated loads are as follows:
a. 0.500 million pounds.
b 1 000 million pounds.
c. 1.250 million pounds.
d. 1.500 million pounds.
e. 2.000 million pounds.
f. 2.500 million pounds.
4.1.3 STRESS AMPLIFICATiON FACTOR
The calculated SAF -aIues for the coupling shall be documenwd at the pipe-to-coupling weld and at the locations of highest stress in the pill and box. SAF is a function of pipe size, and wall thickness. It is calculated as follows.