API 510 Addendum 2 (2018)

Date of Issue: March 2018
Affected Publication: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating,
Repair, and Alteration, Tenth Edition, May 2014
Addendum 2
Page v (Table of Contents): Changed title in the entry for Section 6.7 to the following:
Page 6: Added “deferral” term and definition:
An approved and documented postponement of an inspection, test, or examination. See
Page 6: Added “due date” term and definition:
due date
The date established by the owner-user and in accordance with this code, whereby an
inspection, test, examination, or inspection recommendation falls due or is to be completed.
The date may be established by rule-based inspection methodologies (e.g. fixed intervals,
retirement half-life interval, retirement date), risk-based methodologies (e.g. RBI target
date), fitness-for-service analysis results, owner-user inspection agency
practices/procedures/guidelines, or any combination thereof.
Page 8: Deleted “inspection deferral” definition.
Page 16: Section 4.3 shall read:
All repairs and alterations shall be performed by a qualified repair organization. The
repair organization is responsible to the owner/user and shall provide the materials,
equipment, QC, and workmanship that is necessary to maintain and repair the vessel or
pressure-relieving device in accordance with the requirements of this inspection code.
See definition of a repair organization in 3.1.63.
Page 38: Section 6.6.1 shall read:
Pressure-relieving devices shall be tested and repaired by a repair organization qualified
and experienced in relief valve maintenance per definitions in 3.1.63. Pressure-relieving
devices should be inspected, tested, and maintained in accordance with API 576.
Page 39: Section 6.7 shall read:
6.7 Deferral of Inspections, Tests, and Examinations
Inspections, tests, or examinations for pressure vessels and associated pressure-relieving
devices that cannot be completed by their due date may be deferred for a specified period,
subject to the requirements in the following sub-sections.
Pressure vessels or pressure-relieving devices that are operated beyond the due date
without a valid deferral in accordance with these requirements are not permitted by this
code. Deferrals should be the occasional exception, not a frequent occurrence. All deferrals
shall be documented. Pressure vessels or pressure-relieving devices that were granted a
deferral can be operated to the new due date without being considered overdue for the
deferred inspections, tests, or examinations.
6.7.1 Simplified Deferral
A simplified short-term deferral may be approved by the owner-user if all of the following
conditions are met:
a) The current due date for the inspection, test, or examination has not been previously
b) The proposed new due date would not increase the current inspection/servicing interval
or due date by more than 10 % or six months, whichever is less.
c) A review of the current operating conditions, as well as the pressure vessel or pressurerelieving device history, has been completed, with results that support a short-term/onetime deferral.
d) The deferral request has the consent of the inspector representing or employed by the
owner-user and an appropriate operations management representative(s).
e) Updates to the pressure vessel or pressure-relieving device records with deferral
documentation are complete before it is operated beyond the original due date.
6.7.2 Deferral
Deferral requests not meeting the conditions of a simplified deferral shall follow a
documented deferral procedure/process that includes all of the following minimum
a) Perform a documented risk assessment or update an existing RBI assessment to
determine if the proposed deferral date would increase risk above acceptable risk
threshold levels as defined by the owner-user. The risk assessment may include any of
the following elements as deemed necessary by the owner/user.
— fitness-for-service analysis results;
— consequence of failure;
— applicable damage mechanism susceptibilities and rates of degradation;
— calculated remaining life;
— historical conditions/findings from inspections, tests, and examinations and their
technical significance;
— extent and/or probability of detection (i.e. effectiveness) of previous inspections,
tests, or examinations, as well as the amount of time that has elapsed since they
were last performed;
— considerations for any previous changes to inspection or test intervals (e.g.
reductions in interval due to deteriorating conditions);
— disposition(s) of any previous requests for deferral on the same pressure vessel or
pressure-relieving device;
— historical conditions/findings for pressure vessels or pressure-relieving devices in
similar service if available
b) Determine if the deferral requires the implementation of, or modification to, existing
integrity operating windows or operating process control limits.
c) Review the current inspection plan to determine if modifications are needed to support
the deferral.
d) Obtain the consent and approval of appropriate pressure vessel personnel, including the
inspector representing or employed by the owner-user and appropriate operations
management representative(s).
e) Updates to the pressure vessel or pressure-relieving device records with deferral
documentation are complete before it is operated beyond the original due date.
Page numbers in the Table of Contents have been updated to account for the above changes.

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