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Sampling - Cont'd
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TM-5-3835-220-13P Distributor Water Semitrailer Mounted 6 000 Gal. Capacity Manual
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Sampling and Test Frequency
4-2.3  Test Equipment a. Each TPT is furnished with a testing kit having a description as follows: Testing Kit, Petroleum, Aviation Fuel Contamination, Portable NSN 6630-01-008-5524 Instructions for using the kit are on a placard attached inside the storage chest.  The kit is capable of testing for: Particulate contaminants API gravity Free water content b. Laboratory  facilities  are  not  furnished  specifically  for  a  single  TPT  NSN  3835-01-182-1976.    The  Government normally furnishes the following laboratories to the operating area: Mobile Petroleum Laboratory   NSN 6640-00-902-4940 Airmobile Petroleum Laboratory   NSN 6640-00-902-9711 Petroleum Base Laboratory   NSN 6640-00-303-4940 Describing the make-up and use of these facilities is beyond the scope of this manual. 4-2.4  Sampling and Test Frequency Sampling and test frequency are determined by the service mission and specific operations of the particular TPT.  The reader is referred to the U.S.  Army publications listed in para. 4-2.  It is recommended that a specific sampling and test program be set up for each particular TPT.  The following are guidelines to assist in determining the sampling and testing requirements. a. Sampling  and  Testing  to  Determine  Cut.    The  associated  pipeline  feeding  the  TPT  may  be  in  multiple  fuel service.  Segregated storage of quality fuel in the TPT is desired.  When a new batch of fuel is shipped up the pipeline, the dispatcher will advise the operating supervision at the TPT of its estimated time of arrival.  The fuel ahead of the new batch may be taken into one fuel unit while it is intended to take the new batch into a different fuel unit.  Between these batches is a section of commingling called the "interface".  Upon arrival of the interface, it is desired to cut the fuel to the contaminated fuel storage module.  When the interface has passed, the new batch is cut and sent to the specified fuel unit.  Both these operations are handled by manipulation of the switching manifold which will be discussed further on in this  chapter.    The  determination  of  when  the  interface  has  arrived  and  when  it  has  passed  is  by  sampling,  visual observation and comparison of the samples, and by gravity measurement, all of which can be handled by the portable testing kit (para. 4-2.3a).  Samples are drawn from the sampling assembly, Fig. 2-22, para. 4-2.1 la.  The frequency of sampling  will  be  determined  by  the  rate  of  flow  for  the  particular  installation.    Actual  experience  with  the  particular installation will be the final determining factor.  Generally speaking, samples will be taken 30 minutes before the interface is scheduled to arrive and then at ever decreasing intervals starting at 5 minutes down to 30 seconds until the change in characteristics  indicate  the  arrival  of  the  interface.    Flow  is  then  immediately  routed  to  the  contaminated  fuel  module. When sampling indicates the interface has passed, that is, two 4-5

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