DivideByZero
Chemical
- Apr 7, 2006
- 5
Greetings fellow engineers,
Some of you may be familiar with the problem low silicon (<0.1%) carbon steel presents in sulfidation services: unpredictable (and possibly much higher) uniform corrosion rates.
Fortunately, A-106 has a minimum Silicon spec of 0.10%, which eliminates the concern of accelerated corrosion. Unfortunately, however, A-53 does not have a minimum Silicon spec, so the possibility exists that A-53 material put in high temperature services can experience this problem. And as you know, A-53 looks just like A-106 piping once installed.
One possibility is to PMI these services to determine Silicon content. This will certainly have to be done on older piping, with low silicon piping that is identified being replaced with A-106.
On "newer" piping, however, I'm hoping that it might be simpler--I have seen on internet fabrication sites that A-53 Type S (seamless) has been discontinued and A-106 is used in its place.
My question is simple: 1. Is it true that A-53 Type S is no longer fabricated, and if so, 2. is this officially documented somewhere and 3. when did this occur (i.e what year did they stop making A-53 S)?
Knowing this with a high degree of certainty would allow me to potentially eliminate retro-PMI of newer piping installed after xx year, as well as avoid PMI of new carbon steel piping going into these sulfidation services which would be otherwise required to ensure that A-53 is not installed accidentally.
Any help you can provide will be greatly appreciated!
x/0
x/0
Some of you may be familiar with the problem low silicon (<0.1%) carbon steel presents in sulfidation services: unpredictable (and possibly much higher) uniform corrosion rates.
Fortunately, A-106 has a minimum Silicon spec of 0.10%, which eliminates the concern of accelerated corrosion. Unfortunately, however, A-53 does not have a minimum Silicon spec, so the possibility exists that A-53 material put in high temperature services can experience this problem. And as you know, A-53 looks just like A-106 piping once installed.
One possibility is to PMI these services to determine Silicon content. This will certainly have to be done on older piping, with low silicon piping that is identified being replaced with A-106.
On "newer" piping, however, I'm hoping that it might be simpler--I have seen on internet fabrication sites that A-53 Type S (seamless) has been discontinued and A-106 is used in its place.
My question is simple: 1. Is it true that A-53 Type S is no longer fabricated, and if so, 2. is this officially documented somewhere and 3. when did this occur (i.e what year did they stop making A-53 S)?
Knowing this with a high degree of certainty would allow me to potentially eliminate retro-PMI of newer piping installed after xx year, as well as avoid PMI of new carbon steel piping going into these sulfidation services which would be otherwise required to ensure that A-53 is not installed accidentally.
Any help you can provide will be greatly appreciated!
x/0
x/0
