Unit capacities. The unit capacities required to meet this product slate will be
based on a service factor for each unit. This service factor takes into consideration
the downtime required for each type of process which has been based on statistical
operating experience. This factor may be different for different operating companies based on their experiences, their maintenance philosophy, and design features
of these units that they wish to consider. The latter case, for example, will consider
their current pump sparing philosophy, the sophistication of their plant control
system, and the like. Those service factors used in Table 48 are taken for the
purpose of this exercise, but they are somewhat typical. Application of the service
factor to calculate unit design capacity or stream-day rates from calendar rates is
illustrated in Table 48. The block flow diagram showing this configuration is
Fig. 13.
Table 48 Unit design capacities
Unit
BPCD
Service
factor %
Operating days per
year
BPSD
Remarks
CDU
50,000
92
336
54,500
VDU
25,365
92
336
27,570
Naphtha HDS
17,583
90
330
19,540
Inc Gas ex
Ref
Debutanizer
17,583
92
336
19,110
Inc O/H ex
TC
Nap splitter
14,589
92
336
15,860
Depropanizer
39,60
92
336
4,310
Deethanizer
1,774
92
336
1,930
Cat reformer
8,618
87
318
9,910
On 97 ON
Sev
Thermal
cracker
10,665
87
318
12,260
LGO HDS
90
13,980
On kero
4,545
119
On LGO
8,036
211
Heavy gas oil
HDS
90
16,330
On LVGO
5,425
122
On HVGO
8,036
208
FCCU
8,811
87
318
10,130
Inc Gas
Conc
Isom/alky
3,496
90
330
3,880
Gas treating
2,167
95
347
2,280
Sulfur recovery
62
(tons)
95
347
(70 tons)
Petroleum Products and a Refinery Configuration
121
based on a service factor for each unit. This service factor takes into consideration
the downtime required for each type of process which has been based on statistical
operating experience. This factor may be different for different operating companies based on their experiences, their maintenance philosophy, and design features
of these units that they wish to consider. The latter case, for example, will consider
their current pump sparing philosophy, the sophistication of their plant control
system, and the like. Those service factors used in Table 48 are taken for the
purpose of this exercise, but they are somewhat typical. Application of the service
factor to calculate unit design capacity or stream-day rates from calendar rates is
illustrated in Table 48. The block flow diagram showing this configuration is
Fig. 13.
Table 48 Unit design capacities
Unit
BPCD
Service
factor %
Operating days per
year
BPSD
Remarks
CDU
50,000
92
336
54,500
VDU
25,365
92
336
27,570
Naphtha HDS
17,583
90
330
19,540
Inc Gas ex
Ref
Debutanizer
17,583
92
336
19,110
Inc O/H ex
TC
Nap splitter
14,589
92
336
15,860
Depropanizer
39,60
92
336
4,310
Deethanizer
1,774
92
336
1,930
Cat reformer
8,618
87
318
9,910
On 97 ON
Sev
Thermal
cracker
10,665
87
318
12,260
LGO HDS
90
13,980
On kero
4,545
119
On LGO
8,036
211
Heavy gas oil
HDS
90
16,330
On LVGO
5,425
122
On HVGO
8,036
208
FCCU
8,811
87
318
10,130
Inc Gas
Conc
Isom/alky
3,496
90
330
3,880
Gas treating
2,167
95
347
2,280
Sulfur recovery
62
(tons)
95
347
(70 tons)
Petroleum Products and a Refinery Configuration
121