API 6A-Annex M Qualification of Heat Treating- No.of thermocouples for Calibration
API 6A-Annex M Qualification of Heat Treating- No.of thermocouples for Calibration
(OP)
Hi, Please i need your supports, and get clarified the below ,
Refering Below extract from API 6A
A minimum of nine thermocouple test locations shall be used for all furnaces having a working zone greater than
0,3 m3 (10 ft3).
For each 3,5 m3 (125 ft3) of furnace working zone surveyed, at least one thermocouple test location shall be used,
up to a maximum of 40 thermocouples.
My intrepretation for TUS of furnace with volume 53 cubic meters working zone was 16 thermocouples(ie, 53/3.5=15.14 No.s) to be used during calibration, an auditor explained the same in another way that 16 + 9 a total of 25 No.s Thermocuples shalll be used.
Please i need your supports, and get clarified.
Refering Below extract from API 6A
A minimum of nine thermocouple test locations shall be used for all furnaces having a working zone greater than
0,3 m3 (10 ft3).
For each 3,5 m3 (125 ft3) of furnace working zone surveyed, at least one thermocouple test location shall be used,
up to a maximum of 40 thermocouples.
My intrepretation for TUS of furnace with volume 53 cubic meters working zone was 16 thermocouples(ie, 53/3.5=15.14 No.s) to be used during calibration, an auditor explained the same in another way that 16 + 9 a total of 25 No.s Thermocuples shalll be used.
Please i need your supports, and get clarified.





RE: API 6A-Annex M Qualification of Heat Treating- No.of thermocouples for Calibration
Valvit
RE: API 6A-Annex M Qualification of Heat Treating- No.of thermocouples for Calibration
Industrial Heating ran this table in 2010 for the D version of 2750 (current version is E) for number of thermocouples based on a volumetric calculation.
The table splits the auditor's quantity of 25 and your quantity of 16 at a middling 20 (@57m3)
The original article and table are still on-line at
Link
I'm told that in the aircraft sector the auditor wins these kinds of arguments.
RE: API 6A-Annex M Qualification of Heat Treating- No.of thermocouples for Calibration
RE: API 6A-Annex M Qualification of Heat Treating- No.of thermocouples for Calibration
I don't see how the auditor could win this one.
Consider a sign at a gas station:
Minimum charge for any amount over 1 gallon: $9.00
Charge for gasoline shall be $3.00 per gallon.
So, according to this auditor, if you bought 6 gallons, you'd have to pay $27 (instead of $18)?
Are you asking if you can use spare production T/C's for your survey?
I have never seen it done, but there is no reason it couldn't be done (provided proper documentation).
In general, however, the survey T/C's are Type K (Chromel/Alumel) and the production T/C's are Type S (Platinum/Pt-Rh). The cost of one Type S T/C could pay for a whole whole spool of Type K. It is common to run the survey with a few extra T/C's just in case one of two of them should fail during the survey.