Seal for concrete mixing and pumping

[AngelM]

Hello all,
Could you give the best solution for a mixing and pumping concrete?
Shaft speed: between 70 and 120 rpm
Pressure: Less than 3 bar.

Thank you guys.

 

[AngelM]

Can the solution be a face to face double seal with faces SiC/SiC - SiC/Graphite, viton and API PLAN 53A with barrier fluid water? Pressure 1 bar above product pressure.
As it is a horizontal mixer and pumper two seals are needed (one in each side), Is it posible to use only one reservoir for both matching the seal return pipes?

regards.