Magnetic Flux Leakage Testing of Fired Heater Tubes
Magnetic Flux Leakage Testing of Fired Heater Tubes
(OP)
Does anyone have an opinion concerning the neccesity for magnetic flux leakage testing of fired heater tubes which in all respects comply with the standard requirements of ASTM A-335 Gr P91? The tubes (pipe) are nominal 6 inch diameter, Sch. 40 and were hydrotested at the mill to 2800 psi. Tube metal temperatures are 975F and 1200F.
If anyone has experience to indicate that MFL testing is a requirement is there an acceptable alternative test that can be performed?
If anyone has experience to indicate that MFL testing is a requirement is there an acceptable alternative test that can be performed?





RE: Magnetic Flux Leakage Testing of Fired Heater Tubes
We had some MFL work on some tubes in a Waste Heat Boiler and were satisfied with the results.
I’ve heard from a person at Longview that the MIB technique is very good for boiler tube assessment.
Boilers
http://www.babcock.com/pgg/tt/lit.html
MFL
http://www.lii-nde.com:8282/rockwood/
MIB
http://www.avistarinc.com/services/boiler_inspection.ht...
RE: Magnetic Flux Leakage Testing of Fired Heater Tubes
As unclesyd indicates, it would more likely be specified to assess tube condition in operating systems.
RE: Magnetic Flux Leakage Testing of Fired Heater Tubes
Thanks for your response. Are you able to indicate what company that you work for?
RE: Magnetic Flux Leakage Testing of Fired Heater Tubes
I am sorry; I am unable to state my company's name. We operate primarily in the southern half of the U.S.A.