Gas Pipeline Reversal

[Yoga Arviansyah]

Hi,

We operate a natural gas transmission pipeline system running from east to west. However, a report indicates that in the coming years, changes in supply and demand may necessitate reversing the flow direction (west to east).

Could you provide insights on similar projects, relevant regulations or codes, and key technical considerations for such a transition?

Thank you!

 

[LittleInch]

Bit of a large topic for a forum like this.....

Gas is realtively easy to reverse flow. You just need to add a few compressor stations where you don't have them, rearrange your booster compression stations and add some offtakes. Design pressure is normally unchanged unless you're trying to increase flow rate in the reverse direction. Look out for Non return valves pointing the wrong way.

Just use normal design codes as though you're building it from new. Regulations are country specific, but often don't cover things like this.....

Many networks have pipes in the middel where sometimes you get flow in one direction, sometimes in the other. No big deal.

 

[GD2]

Other things to look at:
Perform major reviews of the pipeline’s condition and history, including:

• Laterals and connections

• Piggability and line cleanliness

• Right-of-way conditions

• Existing threats, such as corrosion or mechanical damage

• Potential threats, such as fatigue

• Equipment required for conversion. Adjusting or replacing valves to ensure proper flow control in the new direction, including isolation valves to segment the pipeline if needed.

• Inline inspection (ILI) and hydrotesting/Pneumatic testing