API 5L pipe line Sizing 2

[Mark62]

What is a typical allowable water velocity used for sizing a rigid flowline (API 5L Line pipe)? The flowline is to be used for water injection, the fluid is process water, which should have been cleaned of most of the nasties.

Second question, I have a typical absolute roughness of 0.15mm for new line pipe and have seen references that this might deteriorate to about 1.5mm due to pipe corrosion. Is this about right?

I know that there are a lot of unknows, such as the exact nature of the water, how much gas, is there any sand etc. but at this stage I just need an indication as to what diameter pipe I might need.

Many thanks

 

[Montemayor]

Mark62:

As you yourself state, there are a lot of unknowns to give a reasonable answer. My guess would be 5 ft/sec to 10 ft/sec.



Art Montemayor
Spring, TX

 

[PVRV]

IMO,

CS not more than 5 ft/sec
70/30 Co-Ni not more than 10 ft/sec

I would suggest some reference pretaining to the adherence of the protective oxide layer.

Cheers