hiebs
Mechanical
- Jun 10, 2003
- 8
I am looking for more information on NACE MR0175/ISO 15156-2(2003). More specifically I am looking for more information on the determination of in situ water pH.
I am a process engineer in the upstream O&G industry and our sour service refers to this NACE spec. Most of the water samples we receive for calculations of pH are depressurized, but we are expected to determine the severity of the sour environment based on the depressurized water sample. My questions are:
1. Are there any rules of thumb for estimating the in situ pH of the water based on a depressurized analysis? E.g. can you assume that there will be fewer in situ bicarbonates in the in situ water based on the depressurized sample? My logic - some water may flash when depressurized, and the bicarbonates stay in the liquid after it has flashed. Is this correct?
2. Is it possible to test a pressurized water sample for pH? This is not a norm in the upstream O&G industry.
3. Are there any books, documents, studies, websites or other threads that may help with my understanding of this topic? Did a search of engtips, but I could not find much.
Unfortunately, it is unlikely that we will be getting pressurized water samples anytime soon, so a good understanding of the topic is essential. I’ve been searching for this for quite some time and cannot find anything on the topic. I’m hoping someone else has more experience with this.
Hopefully my post is clear. Thanks for your help.
Hiebs
I am a process engineer in the upstream O&G industry and our sour service refers to this NACE spec. Most of the water samples we receive for calculations of pH are depressurized, but we are expected to determine the severity of the sour environment based on the depressurized water sample. My questions are:
1. Are there any rules of thumb for estimating the in situ pH of the water based on a depressurized analysis? E.g. can you assume that there will be fewer in situ bicarbonates in the in situ water based on the depressurized sample? My logic - some water may flash when depressurized, and the bicarbonates stay in the liquid after it has flashed. Is this correct?
2. Is it possible to test a pressurized water sample for pH? This is not a norm in the upstream O&G industry.
3. Are there any books, documents, studies, websites or other threads that may help with my understanding of this topic? Did a search of engtips, but I could not find much.
Unfortunately, it is unlikely that we will be getting pressurized water samples anytime soon, so a good understanding of the topic is essential. I’ve been searching for this for quite some time and cannot find anything on the topic. I’m hoping someone else has more experience with this.
Hopefully my post is clear. Thanks for your help.
Hiebs
