New Item
API Specification 6A Furnace Calibration
Requirements
Tim Haeberle
30 June 2011
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 last sentence:
“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 the API Spec 6A 20th Edition, Annex M, Section
M.3.3 to add the following statement after the last sentence:
“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.”
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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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AMS 2750D
Reprinted with permission from SAE AMS2750D © 2005 SAE International
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API CSOEM SR3 Form
• Form ready for submittal
• No money requested
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API Ballot
• Form ready for submittal
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End Of Presentation
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