- Flash Point Prediction - Petroleum Products Blending - Calculation formula and table
- Flash Point Prediction - Petroleum Products Blending - Calculation formula and table
How to predict Flash point of resultant product after blending two stocks ? or how to get volume required of products to get desired blended product Flash Point ?
Many times flash point improvement is desired by blending higher flash petroleum product to lower Flash Point Product at Petroleum storage depots.
List of all blog articles on Petroleum QC by RJ Patel.
List of all blog articles on Petroleum QC by RJ Patel.
Following table and formula can be used to predict the desirable variable figure of volume of product or flash point. In the table below against Flash Point Deg C some constant number "A" is listed in next column.
Formula :
Flash Point C
|
A
|
Flash Point C
|
A
|
Flash Point C
|
A
|
||
20
|
3281
|
50
|
306
|
80
|
45
|
||
21
|
3004
|
51
|
285
|
81
|
43
|
||
22
|
2752
|
52
|
266
|
82
|
40
|
||
23
|
2524
|
53
|
248
|
83
|
38
|
||
24
|
2315
|
54
|
232
|
84
|
36
|
||
25
|
2126
|
55
|
216
|
85
|
34
|
||
26
|
1953
|
56
|
202
|
86
|
32
|
||
27
|
1795
|
57
|
189
|
87
|
30
|
||
28
|
1652
|
58
|
177
|
88
|
29
|
||
29
|
1520
|
59
|
165
|
89
|
27
|
||
30
|
1400
|
60
|
155
|
90
|
26
|
||
31
|
1291
|
61
|
145
|
91
|
24
|
||
32
|
1190
|
62
|
136
|
92
|
23
|
||
33
|
1098
|
63
|
127
|
93
|
22
|
||
34
|
1014
|
64
|
119
|
94
|
21
|
||
35
|
937
|
65
|
112
|
95
|
20
|
||
36
|
866
|
66
|
105
|
96
|
19
|
||
37
|
801
|
67
|
99
|
97
|
18
|
||
38
|
742
|
68
|
93
|
98
|
17
|
||
39
|
687
|
69
|
87
|
99
|
16
|
||
40
|
636
|
70
|
82
|
100
|
15
|
||
41
|
590
|
71
|
77
|
101
|
15
|
||
42
|
547
|
72
|
72
|
102
|
14
|
||
43
|
508
|
73
|
68
|
103
|
13
|
||
44
|
472
|
74
|
64
|
104
|
12
|
||
45
|
438
|
75
|
60
|
105
|
12
|
||
46
|
408
|
76
|
57
|
106
|
11
|
||
47
|
379
|
77
|
54
|
107
|
11
|
||
48
|
353
|
78
|
51
|
108
|
10
|
||
49
|
328
|
79
|
48
|
109
|
10
|
||
50
|
306
|
80
|
45
|
110
|
9
|
Formula :
Ar * 100 = (Vx * Ax ) + (Vy *Ay)
A for Resultant Flash Pt * 100 = ( Volume % of X * A for FPx ) + ( Volume % of Y * A for FPy )
Where FPr = resultant flash point of blend in centigrade
Vx = Volume percentage of X component
Vy = Volume percentage of Y component
Ax = Constant A from table corresponding to flash point of X
Ay = Constant A from table corresponding to flash point of Y
Ar = Constant A from table corresponding to flash point of R
The above formula is clear from the following examples:
Ex 1: Flash Point
of Blend
Component X, Flash
Pt =30 C, vol=50 %, From table A for 30 C FP = 1400
Component Y, Flash Pt =50 C,
vol=50 %, From table A for 50 C FP = 306
Then from equation
Ar* 100 = (50 * 1400) + (50 * 306)
Solving Ar =
853
From the table, nearest
Resultant Flash Point is 36 at Constant Ar of 853.
Ex 2: Flash Point of Blend
Component
X, Flash Pt =25 C, vol=10 %, From table A for 25 C FP =
2126
Component Y, Flash Pt
=45 C, vol=90 %, From table A for 45 C FP = 438
Then from equation Ar* 100 = (10 * 2126) + (90
* 438)
Solving
Ar = 606
From the table, nearest
Resultant Flash Point is 40 at Constant Ar of 606.
Ex 3: Flash Point of Blending Volumes percentages to get
38 deg C
Let Vx = Volume % of X component, therefore Vy = 100 – Vx.
Component
X, Flash Pt =28 C, vol=Vx %, From table A for 25 C FP =
2126
Component Y, Flash Pt
=? C, vol=(100-Vx) %, From
table A for 38 C FP = 742
Then from equation 742 * 100 = (Vx * 2126) + (100-Vx)
* 438)
= 2126 Vx - 438 Vx + 43800
Solving
Vx = 18 %,
and therefore Vy = 82 %
.
Notes : Above calculations predict nearly accurate Flash Point of blended product, however, usual precautions are must for margin in flash point to take care non-homogeneity of mixture and layering in petroleum product tank.
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Comments
My question is, is this table or formula also helpful incase of HDD or LSHF HSD inplace pf SKO?
Yes, this method is useful for any other product like diesel fuels, Aviation Jet Fuels etc.
Significant contamination with lighter product may bring a bit lower value of blend.