Endress+Hauser NXA820 - Page 34

Calculations Tankvision
34 Endress+Hauser
8.1.9 Sediment & Water - S&W
L00-NXA82xxx-16-00-00-xx-072
• Some products have entrained (suspended) sediment and water (S&W)
– i.e. crude’s
• S&W is determined from sample by laboratory method ("Karl-Fisher"-method). The
Sediment and Water percentage (S&W%) determined with the sample is transferred in the
Sediment and Water Fraction (SWF). A correction factor for the product is determined.
As second result the Sediment and Water Volume can be calculated.
Sediment & Water calculation methods
There are 6 methods to calculate S&W
1. SWV = 0
2. SWV = TOV x SWF
3. SWV = (TOV - FWV) x SWF
4. SWV = {(TOV - FWV) x CTSh} x SWF
5. SWV = GOV x SWF
6. SWV = GSV x SWF ("standard" or "default" method)
Where the sediment and water fraction (SWF) is:
L00-NXA82xxx-16-00-00-xx-058
8.1.10 Net Standard Volume - NSV
L00-NXA82xxx-16-00-00-xx-056
Substracting the SWV from the GSV result in Net Standard Volume.
S&WV
S&W
S&W
calculation
8.
Sediment & Water
calculations
CSW
SWF = 1 - (100 - S&W%) / 100
= S&W%/100
S&WV
S&W
CSW
GSV
NSV
S&W
calculation
11.
Net Standard Weight
calculation