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Title: Shipboard Sampling For Accountability In Custody Transfer Eq 5270
Author: Daniel m. Comstock
Source: 2001 International School of Hydrocarbon Measurement
Year Published: 2001
Abstract: New technology continually gives opportunities for achieving higher confidence in measurement of hydrocarbons. It is now possible to detect water concentrations on-line in real time. This can be especially beneficial if any intervention is desired whenever there is a short term limit of allowable water. Short term limits can sometimes be imposed by the receiving pipeline. To prevent damage to a refinery process Unit, short term limits are also sometimes required (e.g. during periods of low inventories causing the need for tight-line receipts. However, automatic in-line samplers are most often used for custody transfer purposes whenever metering systems are used. Large pipeline systems, except in the rare absence of flow meters, use automatic in-line samplers almost exclusively. The value of using automatic in-line samplers for custody transfer is widely accepted. However, manual sampling is also extensively used in certain instances. In marginal production leases where oil changes custody by tank measurement only is an example of this practice. A more dramatic example of this practice involves the movement of crude oil from producing load ports to discharge ports by marine tanker vessels. Although many load ports and disports (discharge ports) are now using in-line automatic samplers, there still remain many locations that do not. This paper will discuss the merits of using portable in-line automatic samplers on-board marine tanker vessels.

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