API Specification 6A Furnace Calibration
Requirements
Tim Haeberle
API SC6 2012 Summer Meeting
The Problem
Current Wording:
• API Spec 6A 20th Edition, Annex M, “Qualification of heattreating equipment”, Section M.3.3, “Temperature survey
method for calibration of batch-type furnaces”, states the
following in the 7th Paragraph:
“When a furnace is repaired or rebuilt, a new temperature
survey shall be carried out before the furnace is used for
heat treatment.”
The Problem:
• This implies a time-consuming and costly full survey is
required, even for minor repairs to a furnace that will in no
way affect the calibration or temperature uniformity in the
furnace.
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The Solution
Proposal:
• Revise API Spec 6A 20th Edition, Annex M, Section M.3.3,
7th Paragraph to the following:
“When a furnace is repaired or rebuilt, a new temperature
survey shall be carried out before the furnace is used for
heat treatment, subject to the following. Repairs that return
the furnace to the condition it was in at the time of the last
furnace survey and calibration or repairs that do not affect
the temperature tolerance of the furnace shall not require a
new temperature survey and calibration. The SAE AMS
2750 sections on furnace modifications and furnace repairs
shall be used to determine whether a new furnace survey
is required.”
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The Solution
Justification:
• There is no need to perform a costly and time consuming
new temperature survey and calibration after repairs that do
not affect the temperature tolerance of the furnace.
• Other recognized industry standards for furnace calibration
permit such repairs without re-calibration. These include:
 SAE AMS 2750D
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AMS 2750D
Reprinted with permission from SAE AMS2750D © 2005 SAE International
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API Ballot
• Ballot ready for SC6 to
approve at the 2012 Summer
Meeting for formal balloting
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End Of Presentation
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Backup Slides
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AMS 2750D
Reprinted with permission from SAE AMS2750D © 2005 SAE International
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