Oil viscosity vs temperature chart pdf#
I did a quick scan of the 2 pdf files in your post. RE: Crude Oil Viscosity watwarrior (Chemical) However, it would seem to me that accurate knowledge of viscosity is unlikely to be critically important when your main interest is in estimating flow in pipe segments. In most cases, one may assume C is 0.8 and then use two viscosities to get A and B.Īs others have noted, it is not feasible to estimate crude viscosity even crudely (pardon the pun) from density data alone. E.g., if the lowest viscosity in your data is 0.3 cS, C cannot be less than 0.7.
NOTE 2: Obviously, (kv + C) cannot be less than 1, so you must ensure that the range of C is restricted by the lowest viscosity from your data. This can easily be done using the Excel Solver, provided you have at least three measurements. T is the temperature (F), and A, B, C are constants found by regression. Where kv is the oil kinematic viscosity (cS), and The Walther equation below is a useful relationship for viscosity v/s temperature for hydrocarbons, provided you don't have non-Newtonian behavior: From where is your crude oil entering the system?
If you get 2-phase flow, it would be foolhardy to try to estimate the flow based on pressure drop measurements if pipe fittings offer a significant portion of the total resistance.įurther, did I understand correctly that you are pumping crude oil from 32 F all the way up to 477 F? This seems an excessive range. Hence, I would recommend a few flash calculations along the path to ensure that you are not running into 2-phase flow.
Oil viscosity vs temperature chart full#
Then, the pressure drop is dependent only on liquid density, other things being equal.Ī full range crude oil is generally hard to keep entirely in the liquid phase above 200 deg F, unless your line pressure is very high. Also, on the Moody chart (for a given e/D ratio) the friction factor falls rapidly with Reynolds number, becoming independent of Reynolds number beyond a threshold value. In my experience, estimating the resistance of partially open control valves is quite error prone.Įxcept in unusual situations, most pipeline flows are turbulent. However, you will have to be very careful about estimating the resistance of pipe fittings, valves, bends, etc. You indicated that you intend to estimate flow using pressure drop measurements in parallel pipes (the total flow before splitting having been metered).