b. A batch number forms the second part of the identification system. Batch numbers are assigned at the
first of the fiscal year beginning with the number "1" for the first batch of any fuel.
(1) An example, 2-60 represents the 60th batch of jet fuel for the fiscal year.
(2) The dispatcher may elect to run the batch number in sequence regardless of product; (for example, 2-
c. The third number used represents the size or quantity of the batch in Mbbl.
NOTE: 20 Mbbl represents 20,000 barrels.
EXAMPLE: 2-40-20: is JP-8, the 40th batch, consisting of 20 Mbbl.
8. Detection of Batch Changes.
In control of product through the pipeline, it must be determined where one batch ends and another batch
begins. The following methods are used:
a. Gravity difference -- the API or specific gravity between the two products will identify the change of
b. Color change -- where color (due to lead) differences are detectable, the different products may be
c. Liquid buffers -- a product such as MOGAS may be used to separate different products.
d. Physical buffer -- an object such as a pig, scraper, or ball placed in the line to cut down on the interface.
e. Dye plug -- color injected into the line to separate like products belonging to different customers.
(1) Disposing of interfaces. There are three alternatives for disposing of interfaces. The alternatives are
(a) All the interface mixture is cut into one or the other adjacent products, a head or tail interface cut.
(b) The mixture is divided between the two adjacent products, usually at the midgravity point.
(c) The whole interface is taken off into a slop tank and is blended at a later time. Note, this
procedure is used in commercial industry but is not a practice in the military system.
(2) Type of cuts. There are four types of cuts that can be made (See Figure 1-1.)