MIL-PRF-15618H (SH)
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The filter-separator assembly described in this specification is intended for use onboard
Naval ships to remove solids and water from fuel systems. These filter-separator assemblies are used in JP-5 and
Naval Distillate fuel systems for aircraft, propulsion and auxiliary power gas turbines, diesel engines, and other
miscellaneous internal combustion engines. New ships being designed with stainless steel fuel systems will utilize
stainless steel filter-separators. This specification is also applicable to existing ships with copper-nickel fuel
systems. Therefore, the purchaser must ensure the filter-separator assembly ordered to this specification is
compatible with system materials and requirements.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of the specification.
b.
If required, the specific issue of individual documents referenced (see 2.2 and 2.3).
c.
Coalescer and separator elements (see 3.1).
d.
When first article is required (see 3.2).
e.
Material (see 3.3).
f.
Flow rate (see 3.4.1).
g.
Maximum allowable working pressure (see 3.4.1).
h.
Size and/or weight requirements (see 3.5.1).
i.
Air eliminator required (see 3.5.2).
j.
Automatic drain required (see 3.5.5).
k.
End connections size and type (see 3.6.1).
l.
Manufacturer's torque requirements for installation of elements (see 3.6.4).
m. Manufacturer's proof of certification of temperature variation (see 4.2.2.6).
n.
Manufacturer's proof of certification of materials (see 4.2.2.7).
o.
Packaging requirements (see 5.1).
p.
Technical manuals and drawings (see 6.4).
6.3 Conformance inspection. Affordable conformance inspection with confidence varies depending upon a
number of procurement risk factors. Some of these factors include contractor past performance, government
schedule and budget, product material and design maturity, manufacturing capital investment and processes applied,
the controlled uniformity of those processes, labor skill and training, and the uniformity of measuring processes and
techniques. During the solicitation, contracting documents should indicate those tests desired from Table I and their
designated frequency based on risk assessment for the procurement.
6.4 Technical manuals and drawings. The requirement for technical manuals and drawings should be
considered when this specification is applied on a contract. The technical manuals and drawings must be acquired
under separate contract line item in the contract (see 6.2).
6.5 Definitions.
6.5.1 Coalescer element. Coalescer elements form the first stage of filtration in a filter-separator and are
designed to remove solids and to coalesce free or emulsified water in the fuel.
6.5.2 Filter-separator. A filter-separator is a vessel containing elements designed to continuously remove dirt
and water from fuel to an acceptable level during fuel transfer or end user servicing.
6.5.3 Separator element. Separator elements form the second stage in a filter-separator and are designed to
repel or prevent coalesced water from being discharged with the fuel.
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