corrosion monitoring

[lokmane]

Dear all,
What should be the distance between the corrosion inhibitor injection point and corrosion coupon/probe? is there a guideline or standard on this subject.
Best regards

 

[amustha1407]

The idea is have representative data for the whole flowline/pipeline/plant segment.
The distance between the two will be more of a operability and layout issue. I would suggest the following partice:
- Provide both downstream and upstream the injection. Any distance is OK as long as you think the data will represent both inhibited and not inhibited.
- If the span between two coupon is too long (for example >30m) add another one

 

[0707]

coupons shall be placed where the dew point takes place. Minimum distance for coupons location from the inhibitor injection point through a quill device, shall be 10 diameters.

regards

 

[zdas04]

In a gas line, the answer is "both should be left in the warehouse since both corrosion monitoring and chemical injection causes many more problems that they solve." In a liquid line see the advice above.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. —Galileo Galilei, Italian Physicist