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Document API RP 2201 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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API RP 2201 Document Information:
Title
Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries
American Petroleum Institute
Publication Date:
Jul 1, 2003
Scope:
Hot tapping is the technique of attaching a welded branch fitting to
piping or equipment in
service, and then creating an opening in that piping or equipment by
drilling or cutting a portion
of the piping or equipment within the attached fitting. (In certain
specific situations a bolted or
mechanical fitting may be used. This approach is not common practice
in oil processing and
petrochemical facilities and this document does not address any
considerations unique to "hot
tapping without welding".) Hot tapping is usually performed when it is
not feasible, or is
impractical, to take the equipment or piping out of service, or to
purge or clean it by
conventional methods. With proper review to determine that a hot tap
is appropriate, and
development and conformance to job-specific procedures, many hot tap
connections have been safely
made without interfering with the process operation.
This publication covers the safety aspects to be considered before and
during hot tapping on
in-service piping or equipment. It provides:
• aids to recognize, review, and address safety concerns;
• a review of potential hot tapping concerns based on industry
experience;
• guidance on planning hot taps;
• application of "hazard versus risk" concepts applied to hot
tapping;
• elements to consider during the hot tap process from job
analysis through completion;
• suggestions on "what to do if things go wrong."
This publication is not:
• a substitute for job-specific planning;
• a set of work procedures.
Virtually every hot tapping job is different. A detailed, written,
job-specific hot tap procedure
should be available before starting each job to help ensure that
appropriate measures are
addressed. If there are standing procedures for hot tapping they
should be reviewed for
applicability to the specific job to be done. These procedures may
need revision in response to
unique job specific problems or situations that may arise concerning
the safety of personnel and
facilities.
The hot tap approach described in this publication applies to piping
and equipment fabricated from
ferritic and austenitic steel. Other materials, such as aluminum,
copper, plastic, and cast iron
may be unsuitable for hot tapping or welding or may require special
procedures.
Hot tapping is a "change" subject to review based on facility
"management of change" processes or
procedures.
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