API 6AV1 Class III Sand Slurry testing - ball valve

[Danlap]

Good day valve expert,

In need for super ball valve which have the capability to handle slurry and/or already have proven record of passing API 6AV1 Class III Sand Slurry testing.
Our product is Naphtha in carbon steel pipeline hence corrosion rate is quite high. Nonetheless ball valve PIG-able still preferred over through conduit gate valve.
Is there any ball valve with 'scrapping' capability as indicated above?

Thank you,
Kind regards,
D

 

[LittleInch]

"Nonetheless ball valve PIG-able still preferred over through conduit gate valve."

Errr why?

A full bore thru conduit gate valve is, IMHO, at least as good as a full bore ball valve.

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

 

[Danlap]

Thanks LittleInch,

I tend to agree with you, however this is Operation request. Valves will be buried underground.
Brought the gate valve option but got reply with following comments:

- The bottom cavity of the valve body will collect water (corrosion) and rust (particles + flakes) over time, which make it impossible to fully open/close the valve over time, without frequent flushing of the valves.
- Flushing will get rid of the small particles, but not of the flakes we can collect. This is not meeting the maintenance free/low maintenance requirement.
- Corrosion of valve body needs to be monitored and cannot be detected by intelligent pigging. So risk of unnoticed/unpredictable corrosion exists.

PS: our wet Naphtha corrode our carbon still piping with a rate of approx. 0.2 mm/year

 

[LittleInch]

Danlap,

See attached and just buy a "reverse acting" slab gate valve.

https://www.petrolvalves.com/upload/product-pdf/THROUGH_CONDUIT_SLAB_GATE_VALVES.pdf

This keeps the slab in the bottom cavity avoiding the issue mentioned.

There is no way on gods earth that a valve body corrosion can be detected by an intelligent pig. Far too thick.

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

 

[gerhardl]

If available in size and pressure class needed I would have suggest a ceramic (or ceramic lined) ball valve. I do not know however if valves available on the market also are qualified with the necessary certification. You could check Valmet/Neles or others.