Status: Alert Withdrawn. Norwegian title: Marine Drilling Riser Couplings. English title: Marine Drilling Riser Couplings. Item type: Standard (Kun elektronisk). Tensile test, performed in accordance with the API Spec. 16R standard, is used to verify whether the design of key load bearing parts of the marine riser, such as. As recommended by API Spec 16R, the stress linearization and classification in one of the key steps to design a riser connector. The designers are encountering .

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No manipulation of the? A sppec having a slotted cylindrical element joining mating coupling members. Finite Element Analysis performed in accordance with 4.

Note that all stresses are not included when calculating every von Mises effective stress.

The API specification 16R requirements regarding the design criteria are then discussed. Examination shall include 1?

A primary stress is one that is induced by the external zpec or preload and is necessary to satisfy the laws of static equilibrium. Metal impression stamp shall be used in low stressed area on both box and pin ends.

If preload stresses are considered as secondary, the designer must demonstrate that the permanent deformations induced by preload will not cause the coupling to lose any necessary functional capability. 116r manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard.

The following paragraphs describe this procedure in detail. The coupling rated load must be determined from these curves. A short presentation of a breech-block type riser connector, on which the methodology has been applied, is given at the beginning of this paper. API is not undertaking to meet the duties of employers, manufacturers, or suppliers to warn and pai train and equip their employees, and others exposed, concerning health and safety risks psec precautions, nor undertaking their obligations under local, state, or federal laws.


The coupling design load can be speci?

API Spec 16R (R)

A peak stress is a highly localized stress that exists at a discontinuity in the load path. Under the rated working load, no average section stress in the riser coupling shall exceed allowable limits established in this speci? Therefore, the analyst must predict where high stresses wpi likely to occur.

Strain gauge data shall be used to measure preload stresses as they relate to make-up load or displacement. This can result in large permanent deformations, but not in structural failure.

API Product Specification

If separation can occur, then provision for it must be included in the analysis if possible. In general, there are six components of stress across any section: Normally, riser couplings exhibit a linear or bilinear relationship between load and stress.

Surface porosity and exposed slag are not permitted on or within surfaces. Next, the membrane and bending stress components must be categorized into one of the following stress categories: Start Webshop Product catalog Product presentation. Status of the publication can be ascertained from the API Authoring Department [telephone ].

This situation presents a real challenge for the design of the drilling riser which depends to a large extent on these parameters, as well as other related to operational and environmental conditions.


Neither calculated nor measured stresses in a coupling shall exceed the allowable stress limits of the coupling material when subjected to the design load. No indications whose signal amplitude exceeds the reference level shall be allowed. A web subscription provides an easy and secure access to standards, and you are guaranteed to always have the latest edition.

When simulating the spider hangoff loads, only the box or pin end whichever hangs in the spider should be loaded. Analysis of the effects of preload and the possibility of separation may require special treatment in the? The testing has two primary objectives: For simplicity, the design loading condition is taken to be axisymmetric tension.

These tests and those described in 4. Using a very small area results in the peak stress, not the local membrane stress. The coupling design load shall be applied to verify any assumption made in the analysis regarding separation. Acceptance criteria is in accordance with manufacture’s written speci?

The following procedure shall be used for an individual coupling design: An example of a bearing stress is the contact stress between the dogs and the loading shoulder of a dog coupling.

The loads experienced when landing on and hanging from the spider while running and pulling riser may be simulated. Section 7 covers quality control. This stress is necessary only to insure the coupling has continuity of deformations at the discontinuity; thus, it is a secondary stress.