MIL-DTL-22606D(SH)
4. VERIFICATION
4.1 Sampling for inspections.
4.1.1 Lot samples.
4.1.1.1 Lot - flasks. For purposes of heat treatment only, a lot shall consist of flasks of the same material,
diameter, and wall thickness which are fabricated from approved heats of steel (see 6.4.1) that are heat-treated in the
same heat treatment furnace charge (see 6.4.3).
4.1.1.2 Lot - non-pressure boundary parts. For non-pressure boundary parts which are welded to the flask, a lot
shall consist of parts from an approved heat of steel (see 6.4.2). Non-pressure boundary parts may include, but are
not limited to, such items as fitting and mounting attachments (e.g., skirts, mounting blocks, body bands), and
accessory attachment equipment (e.g., pressure or temperature sensor sites).
4.1.1.3 Lot - plugs. For purposes of heat treatment only, a lot shall consist of plugs of the same material, heat,
method of fabrication (i.e., forged or barstock), and treated in the same heat treatment furnace charge.
4.1.2 Sample tests.
4.1.2.1 Test samples representing flasks. A circular test sample (ring) at least 24 inches long shall be
heat-treated with each lot of flasks. The test sample shall be in the shape of a right circular cylinder with ends
closed if flasks are quenched from the outside only; otherwise, the cylinder shall be open ended. For closed ended
test samples, one end may be vented to prevent pressure buildup during heat treatment. The cylinder shall be of the
same material, diameter, wall thickness, and subjected to the same manufacturing processes (except end closure) and
heat treatment as the flasks which it represents. Test specimens shall be cut from the cylindrical portion of the test
sample. Four longitudinal round specimens shall be cut from the test sample at locations spaced 90 degrees apart for
yield and tensile testing in accordance with 4.3.2.1. Three longitudinal Charpy V-notch test specimens shall be cut
from the upper quadrant of the test sample for testing in accordance with 4.3.2.2. A flask from the lot may be
substituted for the test ring specified.
4.1.2.2 Test samples representing non-pressure boundary parts. Test samples used in determining lot approval
of non-pressure boundary parts shall be quenched in the same orientation and for the same quench medium exposure
as during flask heat treatment. Non-pressure boundary parts which have been subjected to the lot approval
procedure specified in 4.1.1.2, and which have met the mechanical property requirements specified in table II shall
not be subject to additional testing with each heat treatment furnace charge. For all non-pressure boundary parts,
four test specimens shall be cut from the test sample for yield and tensile testing in accordance with 4.3.2.1. For
skirt material only, three longitudinal Charpy V-notch test specimens shall be cut from the test sample for testing in
accordance with 4.3.2.2.
4.1.2.3 Test samples representing plugs. Test samples for use in determining lot approval of plugs shall be
obtained from heat-treated stock. If individual forgings are heat-treated for plug manufacture, a treated forging from
each lot shall be used as the test sample. If heat-treated bar stock is used for plug manufacture, a test sample shall be
obtained out of a bar from each lot. Four test specimens shall be cut from the test sample for yield and tensile
testing in accordance with 4.3.2.1.
4.2 Visual and dimensional examination. The following examinations shall be performed on each flask.
4.2.1 Visual examination. Each flask shall be visually examined to verify conformance to surface preparation
in 3.5. Surface imperfections, if greater than 1/16 inch deep, shall be faired at not less than a 4-to-1 ratio into the
adjacent area by grinding or machining. Tightly adhering weld spatter which is acceptable in accordance with
T9074-AD-GIB-010/1688 shall not be cause for rejection.
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