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Question No.:  5882 Category :  Refining Operations
Date Posted:  3/16/2017
Subject: LSHV
What is LSHV and how is it maintained? What will happen to reaction if LSHV increases or decreases?
Submitted by :
Company Name:

Abu Sara
Oman refinary
Sohar, Oman


Number of responses : 3
Response 5882-3
Date : 4/16/2017

LSHV is defined as the ratio of the hourly flowrate of liquid feed to the volume of catalyst, i.e. LHSV = Hourly feed flow rate @ 15 Degree C (m3/hr) / Total catalyst volume (m3).

This is a direct measure of the severity of the operation.

The quantity of catalyst being a constant, the space velocity can only be changed by varying the liquid feed rate. Decreasing the feed rate decreases the space velocity. At constant temperature this increases activity and therefore improves the hydrodesulfuring efficiency. For small changes in the feed rate, no action is required by the operator, for large reductions however the operator can operate at a lower temperature to preserve the cycle length.

Name - Nixon
CompanyName - Qatar Gas
Location - Ras Laffan, Qatar
Email -

Response 5882-1
Date : 3/17/2017

The liquid hourly space velocity (LHSV) is defined as follows: LHSV is volume of charge per hour by volume of catalyst. LHSV is simply an approximate way of estimating the amount of catalyst one would need to purchase for a given feed capacity and product yield. Liquid hourly space velocities (LHSV) in the range of 2-10 hour are used for light products, while it is 0.2-10 hour for heavy residues.

Name - Sridhar Balakrishnan
CompanyName - Nagarjuna Oil Corporation Ltd.
Location - Cuddalore, Tamil Nadu, India
Email -

Response 5882-2
Date : 3/19/2017

Liquid hourly space velocity (LHSV) is the relationship between the oil flow rate through the reactor and the quantity of catalyst. The units are barrels/H of oil per barrel of catalyst or cubic meters/H of oil per cubic meters of catalyst. It is one of the dependent variables. For example, if the LHSV is increased, reactor inlet temperature or hydrogen circulation is increased to maintain conversion.

Name - Ralph Ragsdale
CompanyName - Ragsdale Refining Courses
Location - Houston, TX, USA
Email -


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