MIL-PRF-3627G
references cited herein, the text of this document takes precedence. Nothing in this document,
however, supersedes applicable laws and regulations unless a specific exemption has been
obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2) a sample shall be subjected to first article inspection
in accordance with 4.2.
3.2 Materials. The contractor shall select the materials, but the materials shall be capable of
meeting all the operational and environmental requirements specified herein. Recovered
materials shall be used to the maximum extent possible. Used, rebuilt, or remanufactured
components, pieces and parts shall not be incorporated in the penetrometer.
3.2.1 Deterioration prevention and control. The penetrometer shall be fabricated from
compatible materials, inherently corrosion resistant or treated to provide protection against the
various forms of corrosion and deterioration to which the material is susceptible.
3.2.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements, and promotes
economically advantageous life cycle costs.
3.3 Environmental considerations. The penetrometer shall be constructed in such a way that its
operation is unaffected by moisture and shall operate within the temperature range of 320 to
1250 F.
3.4 Maintainability. The penetrometer shall be supplied with all required parts, tools, and
documentation to allow operation and maintenance in the field, without special training.
3.5 Transportability. The penetrometer with all required parts, tools, and documentation shall
be provided in a suitable case and transportable in the field by a single person.
3.6 Durability The penetrometer shall withstand the rigors and stresses of unrestricted use under
conditions specified herein, without repair, for not less than one year. Zeroing of the instrument,
routine mounting block adjustment, or the replacement of damaged cones will not be considered
repair. For type I instruments, permanent deformation of the proving ring resulting from the
testing of any soil, that can not be corrected by re-calibration, shall not be acceptable.
3.7 Performance characteristics. The penetrometer shall contain an indicator capable of legibly
displaying readings from 0 to 150 pounds per square inch (PSI) and shall return to 0 PSI between
readings. Graduations shall be in no greater than 10 PSI increments. The indicator shall
maintain an accuracy of ± 2.5 PSI up to 50 PSI and ± 3.5 PSI beyond the 50 PSI range. The
penetrometer shall be capable of one-man operation.
3.8 Dimensions. The penetrometer shall be no greater than 28 inches in length, with the main
portion of the device within an envelope of four inches in diameter. The penetrometer shall
weigh no more than 20 LBS.
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