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# How to calculate salt content in PTB?

## How to calculate salt content in PTB?

(OP)
Hi everyone.

Which methods are correct to determine salt content in PTB (pounds per thousand barrel)?

I have done a test to determine the value of Chloride for Crude oil entering Desalter using Mercury Nitrate titration method. The value of Chloride is 10 ppm.

My laboratory method to determine salt content (ptb) is 10 ppm Chloride x 1.65 divide by 2.853 which yield 5.78 ptb.

However, when i check Oilfield Processing of Petroleum - Volume 2 - Manning & Thompson book, the equation use is very different. I need to put BS&W value. The equation is

Assuming BS&W in = 0.5 vol%, SG = 1.02 and Chloride ppm = 10 ppm, therefore the value would be 0.018 ptb.

Which one of these equations are correct to determine salt content in PTB? I your guidance.
Replies continue below

### RE: How to calculate salt content in PTB?

Without addressing the posted question, since I don't have the M&T book, it is apparent to me that if ppm is given on a weight basis, such as mg/kg, the crude density plays a role. For example, for a density of 0.839 g/L, 1 ptb ≈ 3.4 ppm.

If ppm is given on a weight per volume basis, such as mg/L, then the conversion would be: 1 ptb ≈ 2.85 ppm.

### RE: How to calculate salt content in PTB?

(OP)
Thanks bro. I need to know first the ppm Chloride that i obtained previously is based on weight or volume basis.

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