4 replies to this topic

[SAprocessGD]

Hey,

I have a few questions on trucks loading/off-loading emulsion.

In applications where you're required to transfer emulsion (atmospheric conditions) and you are loading the emulsion into a truck, what pressures is the emulsion held at in the truck? Are the trucks capable of pressurizing this fluid if you are only transfering the emulsion from one storage tank to another.

Secondly, when off-loading the emulsion using a pump mounted on the truck, what would the typical dishcarge pressures be?

If I forgot to mention anything or if anything needs to be clarified, please let me know and I will try and respond as soon as I can.

Thanks,

[Technical Bard]

If you are trucking an oil water emulsion in an atmospheric truck, then it must have been degassed and stored in an atmospheric tank prior to loading. Therefore the pressure in the truck is also atmospheric.

You would need to look at the trucks you are using to see if they have a pump on board to offload under pressure. I've never seen a truck with a "pressurizing" system to unload using a blanket gas, although in theory this would work (so long as the truck was designed for the pressure required.

Most trucks I've seen for hauling crude oil are not designed for any significant internal pressure.

[breizh]

Good day,

Can you be more specific about emulsion ?
For example synthetic latex is an emulsion and we are using diaphragm pump to load truck and transfer to storage tanks.
Hope this helps
Breizh

[SAprocessGD]

Thanks for the replys.

breizh: The emulsion I am refering to is water and light crude (40 API) with no vapours (all degassed in an atmospheric storage tank prior to loading).

Cheers,
SAprocessGD

[TS1979]

Normally truck tanker has its own pressure relief system to avoid overpressure the tank. However, like vessels, the tanker should never press the liquid system because liquid is incompressible. If there is a vapor inside the tank, the tank can hold the vapor pressure. Depending on the service, the truck tank can hold pressure as high as 50 psig. You can contact with the truck tank company to get their specification.

As for the transfer pump, once again, it depends on the service and requirement. The pump can booster to whatever pressure you need provided that you have enough NPSH available for emulsion service.