7 replies to this topic

[Noman97]

Hello Everyone,

I hope all are staying healthy. I just wanted to know that does their exists any standard practice or guideline regarding crude storage capacity in correspondence to refinery throughput? or what's the current practice in terms of how many operational days can refinery run without any crude receipts? Kindly share if you came across any.

 

Thank you for your help!

[breizh]

Hi,
You may find pointers in the link attached, document prepared by Ankur.
Someone like Shvet1 should be able to help.
https://www.cheresou...arious-factors/

Breizh

[shvet1]

How is crude oil delivered: trucks, railroad, tankers, pipeline?

[Noman97]

@shvet1 Refinery throughput is 53,000 BPSD and for that 80% of crude is getting in through pipelines while remaining by bowsers. Origin or source of crude is indigenous i.e., zero import.

Edited by Noman97, 20 January 2024 - 11:45 AM.

[shvet1]

A rule of thumb is:

 

Storage capacity = A + B * ( C + D )

 

where 

 

A - max crude parcel size

Note: the volume of the largest anticipated crude receipt at the refinery by means other than pipeline.

 

B - Pipeline stream day feed rate

Note: 53,000 BPSD

 

C - Days of advance and delay

Note: the number of days, which correspond to the anticipated deviations between a planned arrival time and an actual arrival time. The number can be determined for rough estimates on the previous experience of the refinery. Advance days are associated with shipments arriving ahead of schedule and  require crude tank space. Delay days are associated with shipments arriving late and require crude tank stock to maintain pipeline supply

 

D - Pumping and settling time

Note: the time required for the tanker to discharge the maximum parcel size. Most tankers have pumping capability to discharge their cargo within 24 hours. The settling time is the time required to settle the crude and draw off the water. Settling time depends on the degree of cleaning of the crude tanks; typical settling times in clean tanks is 1/2 to 2 days. This time increases should there be a sludge problem due to either the receipt of heavy or special crudes, or if existing mixing facilities are not efficient or are underpowered.

 

This technique can also be used to size crude tankage for refineries that are supplied by a pipeline. The maximum parcel size would correspond to the maximum pipeline receipt size, and the advance and delay days would be equivalent to the anticipated outage time, which can be obtained from the pipeline operators.

 

Sum of ( C + D ) should be 5-15 days. If less than 5 days than a risk exists the crude stock is not settled properly. If more than 15 days a such facility relates more to midstream business (not downstream).

 

Important - the rule above does not take into account the turndown period of pipeline and refinery both (assumed that the crude stock supply is suspended or diverted to another point).

Edited by shvet1, 22 January 2024 - 04:27 AM.

[Noman97]

Dear shvet1,

A dictate volume of one unit (i.e., one bowser or tanker) or total crude receipts for one day by all bowsers?

[shvet1]

 total crude receipts for one day by all bowsers

[Noman97]

Thank you so much to both for your help