that when blending is the recommendation, blending is to be done to meet use limits first. Then, once it's
been determined that there is no use limit, recommend blending to meet product specifications.
Blending also involves the addition of additives such as Fuel System Icing Inhibitor (FSII) or Static
Dissipator Additive (SDA); this type of blending is known as inhibiting.
Filtration or Purification. Filtration or purification is the removal of contaminating agents by settling,
filtration, or a filter/separator. Coarse particles of dirt, mill scale, and rust settle out of light products if
allowed to stand undisturbed after receipt. A minimum tank settling period of 2 hours is required for all
aviation fuels, automatic gasoline, and diesel fuels after fresh stocks have been added. At least 24
hours is advisable for heavy products such as burner fuels. In addition, the product should be subjected
to visual or quality tests prior to issue. Fine particles can be removed by adequate filter/separators.
DFSC Procedures. The disposition of product that meets deterioration limits is covered in MIL-HDBK-
200, Chapter 11. The determining factors (Paragraph 11.1.2) must be carefully considered before
reclamation is recommended. All the concerned activities (Paragraphs 11.3.1, 11.3.3, and 11.3.4) must be
informed prior to any action towards product issue or reclamation.