 |
| Purchase Information |
| Use this form to request purchase information on API online subscriptions. |
|
|
Document API RP 1117 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
You may also purchase this document alone from the IHS Standards Store.
API RP 1117 Document Information:
Title
Recommended Practice for Movement in In-service Pipelines
American Petroleum Institute
Publication Date:
Jul 1, 2008
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. (In this
document, the terms lowering and movement can be used
interchangeably.) This recommended practice presents general
guidelines for conducting a pipeline-movement operation without
taking the pipeline out of service. It also presents equations for
estimating the induced stresses. To promote the safety of the
movement operation, it describes stress limits and procedures.
Additionally, it outlines recommendations to protect the pipeline
against damage. The practicality and safety of trench types,
support systems, and lowering or other 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
induced stresses and deflection profiles. Other calculation methods
such as finite element analysis may be used instead. See the
publications listed in Section 2 and the bibliography.
Applications
This recommended practice applies to onshore steel pipelines.
Moving in-service pipelines can be a safe, cost-effective means of
relocating a pipeline without loss of service. The recommendations
presented in this recommended practice should be applicable to any
lowering or other movement of existing pipelines that is undertaken
either to accommodate new roads, railroads, foreign utilities,
ditches, or creeks or to accommodate any condition for which moving
the pipeline is the chosen alternative.
Exceptions
The recommendations in this document should not be applied
retroactively to pipelines that were moved prior to the effective
date of this recommended practice. Also, these recommendations
should not be applied to movement due to mining or natural
subsidence. The movement of pipelines with attached appurtenances
is beyond the scope of this recommended practice.
The following pipelines were not considered in developing the
methods, criteria, values, and recommendations presented in this
document:
a) offshore pipelines;
b) pipelines with valves, flanges, fittings, concrete coatings,
or attached appurtenances in the section to be moved;
c) pipelines joined by oxyacetylene welds, mechanical joints, or
girth welds of known poor quality (unless welds are reinforced by
full encirclement sleeves or other acceptable means).
Safety Considerations
Caution—The recommendations in this document promote
safety under conditions normally encountered in the pipeline
industry. Requirements for abnormal or unusual conditions are not
specified, and some details of engineering and construction are not
provided. All movements of in-service pipelines should comply with
applicable safety standards.
Conventions
In this document, each equation term is defined in Annex A and
beneath the first equation that uses it. Also, negative values for
stress indicate compressive stress and positive values indicate
tensile stress.
About IHS
IHS (NYSE: IHS) is a leading global provider of critical technical information, decision-support tools and related services in a number of industries including aerospace and defense, automotive, construction, electronics, and energy. IHS serves customers ranging from large governments and multinational corporations to smaller companies and technical professionals in more than 100 countries. IHS been in business for more than 45 years and employ more than 2,300 people around the world.
