Refinery Tankage Estimation

For estimating the tankage requirements for a refinery, the following information is required:

1. Refinery process unit capacities, in tons and barrels per day.

2. Refinery material balance and product blending schedule. (Figure 10-1).

3. Rundown temperature of all streams flowing to the base stock and shipping tanks (Table 10-2) to determine product density.

4. Information on the refinery marine terminal product loading facilities; that is, the available sea lines, product pumping rates, and connections to various berths (Table 10-1). A refinery maintains x x x

gases REFINERY BLENDING

gases REFINERY BLENDING

Hsr Naphtha Product Gasoline
Figure 10-1. Refinery block flow diagram and blending schedule. SR = straight run; LSR = light straight run; HSR heavy straight run; WSR=whole straight run; VGO = vacuum gas oil; HVGO = heavy vacuum gas oil; CDU = crude distillation unit; H.C. = hydrocracker; SR.V.Resid = Straight Run Vacuum Resid.

Table 10-2

Storage Temperatures of Refinery Streams

NORMAL

MINIMUM

NORMAL

FLASH

FLASH

NORMAL

MAXIMUM

STORAGE

STOCK

TYPE

POINT, °F

POINT, °F

RVP, psi

RVP, psi

TEMPERATURE, °F

crude oil

floating

6.0

115

full range naphtha

7-9.5

105

cat reformer charge

floating

1.5

100

reformate

floating

8-9

9.5

100

unleaded gasoline

floating

8-10

10.5

100

kerosene unifiner charge

floating

125

kerosene/diesel

fixed

100-160

100/140

110

diesel

fixed

150-200

140

125

marine diesel oil

fixed

150-180

130

110

diesel hds charge

floating

>200

200

160

raw light diesel

floating

150-230

150

140

desulfurized gas oil

fixed

>200

150

125

hydrocracker charge/hvgo

floating

>200

200

175

fuel oil

fixed

150-230

150

155

resid hydrocracker

fixed

>200

200

490

chargh/v.r

slop

fixed

0-15

110

HVGO = HEAVY VACUUM GAS OIL; VR = VACUUM RESID.

HVGO = HEAVY VACUUM GAS OIL; VR = VACUUM RESID.

historic data of previous years on the average and maximum size of tankers calling on the terminal to take product, by product group (naphtha, kerosene, diesel, fuel oil. etc.), which serves as the basis for future projections (Table 10-3).

An example for determination of the working capacity of refinery tankage follows.

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