Pipe Material Selection 1

[Cronos_2P]

Hi to all,

What type of material should be used for the inlet and transfer pipes of crude oil to cylindrical furnace if the operating conditions are as follows:

• Inlet Line: Max. Pressure: 220 Psi, Max. Temperature: 360 °F.
• Transfer Line: Max. Pressure: 60 Psi, Max. Temperature: 600 °F.

It is convenient to use carbon steel pipe such as ASTM A-106 Gr. B, or it is better to use an alloy steel such as ASTM A-335 Gr. P9 considering that there is biphasic fluid and entrainment of solids such as coke formed in the furnace.

Any suggestions on how to support the choice of one or the other material for this case?

In advance thank you very much for the help.

 

[weldstan]

Not enough info. Not all crude oil is the same. What is the unit in the refinery? One supposes it is in a refinery. Generally, a refinery corrosion specialist would make the selection based on prior experience.

 

[LittleInch]

The first one A105 looks OK.

The second is getting a bit high temperature so you need a metallurgist to have a look.

Erosion is more of a velocity issue. Any metal is going to differ if you've got loads of solid at high velocity. Then you start to need ceramics.

Length becomes important. 50m of something exotic might be OK but not 1500m.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Cronos_2P]

Sorry, I forgot to mention the following information:

The inlet line (NPS 10") comes from a preheating exchanger and is approximately 55 m long.
The outlet line (NPS 16") goes to an atmospheric distillation column and is approximately 65 m long.

 

Crowdsourcing is not a reliable approach to designing reliable, safety-critical refinery equipment.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[weldstan]

Appears to be a Crude Unit. Again not enough info as to the crude oil composition. In a number of Crude units in my past experience, the inlet was carbon steel and the outlet was 5 Chrome. You need to seek the expertise of a refinery metallurgist to get an appropriate answer based on the Crude composition or anticipated compositions.

 

[MJCronin]

I agree with Ironic....

While crowdsourcing may be wonderful for developing short stories, screen plays, movies and lesson plans its use may be folly when designing and selecting expensive refinery piping.

Always remember, here at ENG-TIPS.COM .... you get what you pay for !!!

MJCronin
Sr. Process Engineer