ISO DIS 10400

Description / Abstract: This document illustrates the formulas and templates necessary to calculate the various pipe properties given in ISO standards, including:

—Pipe performance properties, such as axial strength, internal pressure resistance and collapse resistance,

—Minimum physical properties,

—Product assembly force (torque),

—Product test pressures,

—Critical product dimensions related to testing criteria,

—Critical dimentions of testing equipment, and

—Critical dimensions of test samples.

For formulas related to performance properties extensive background information is also provided regarding their development and use.

Formulas presented here are intended for use with pipe manufactured in accordance with ISO 11960/API 5CT, ISO 11961/API 5D and ISO 3183/API 5L, as applicable. These formulas and templates may be extended to other pipe with due caution. Pipe cold worked during production is included in the scope of this document (e.g. cold rotary straightened pipe). Pipe modified by cold working after production, such as expandable tubulars and coiled tubing, is beyond the scope of this document.

Application of performance property formulas in this document to line pipe and other pipe are restricted to their use as casing/tubing in a well or laboratory test and requires due caution to match the heat treat process, straightening process, yield strength, etc., with the closest appropriate casing/tubing product. Similar caution should be exercised when using the performance formulas for drill pipe.

This document and the formulas contained herein relate the input pipe manufacturing parameters in ISO 11960/API 5CT, ISO 11961/API 5D and ISO 3183/API 5L to expected pipe performance. The design formulas in this document are not to be understood as a manufacturing warrantee. Manufacturers are typically licensed to produce tubular products in accordance with manufacturing specifications which control the dimensions and physical properties of their product. Design formulas, on the other hand, are a reference point for the user to characterize tubular performance and begin his own well design or research of pipe input properties.

This document is not a design code. It only provides recommended formulas and templates for calculating the properties of tubulars intended for use in downhole applications. This document does not provide any guidance about loads that may be encountered by tubulars or about safety margins needed for acceptable design. Users are responsible for defining appropriate design loads and selecting adequate safety factors to develop safe and efficient designs. The design loads and safety factors will likely be selected based on historical practice, local regulatory requirements, and specific well conditions.

All formulas and listed values for performance properties in this document assume a benign environment and material properties conforming to ISO 11960/API 5CT, ISO 11961/API 5D and ISO 3183/API 5L. Other environments may require additional analyses, such as that outlined in Annex D (informative).

Pipe performance properties under dynamic loads and pipe connection sealing resistance are excluded from the scope of this International Standard.

Throughout this document tensile stresses are positive.