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API RP 1117

Lowering In-Service Pipelines

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Organization: API
Publication Date: 1 February 1993
Status: inactive
Page Count: 36
scope:

This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering operation conducted while the pipeline is in service. It presents general guidelines for conducting a pipeline-lowering operation without taking the pipeline out of service. It also presents equations for estimating the lowering-induced stresses. To promote the safety of the lowering operation, it describes stress limits and procedures. It outlines recommendations to protect the pipeline against damage. The practicality and safety of trench types, support systems, and lowering methods are considered. Inspection procedures and limitations are presented.

The calculations in this recommended practice are based on methods developed from elastic free deflection theory to determine lowering-induced stresses and deflection profiles. Other calculation methods such as finite element analysis may instead be used. See the publications listed in 1.7.

Methods for handling field bends, valves, fittings, or other attachments to a pipeline and methods for lowering a pipeline with attached appurtenances are beyond the scope of this recommended practice.

Document History

July 1, 2008
Recommended Practice for Movement in In-service Pipelines
This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering or other movement operation conducted while the pipeline is in service. (In this document, the...
July 1, 2008
Recommended Practice for Movement in In-service Pipelines
This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering or other movement operation conducted while the pipeline is in service. (In this document, the...
July 1, 2008
Recommended Practice for Movement in In-service Pipelines
This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering or other movement operation conducted while the pipeline is in service. (In this document, the...
July 1, 2008
Recommended Practice for Movement in In-service Pipelines
This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering or other movement operation conducted while the pipeline is in service. (In this document, the...
July 1, 2008
Recommended Practice for Movement in In-service Pipelines
This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering or other movement operation conducted while the pipeline is in service. (In this document, the...
January 1, 1996
Movement of In-Service Pipelines
1.1 Scope This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering or other movement operation conducted while the pipeline is in service. (The terms...
API RP 1117
February 1, 1993
Lowering In-Service Pipelines
This recommended practice covers the design, execution, inspection, and safety of a pipeline-lowering operation conducted while the pipeline is in service. It presents general guidelines for...

References

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