MIL-DTL-2845E (SH)
required on the applicable shafting drawing or technical repair standard do
not require further preservation of the shaft bore. Finished and unfinished
shaft bores not sealed by metal plugs shall be sealed with wood plugs or
disks. The wood plugs shall be attached to the shaft and sealed with a
commercial grade butyl rubber adhesive to provide a watertight seal. The
exposed ends of prairie air piping installed in a shaft shall be sealed with
plastic caps or plugs prior to the sealing of the shaft bore.
3.15.4 Shaft packaging. After preservation, external shaft surfaces
including fiberglass areas shall be provided a preliminary wrap of greaseproof
barrier material in accordance with MIL-B-121, type I, grade A, class 2
followed by an overwrap with type I, grade C, class 1 or 2 at the packaging
activities option. After covering with the greaseproof material, all external
shaft surfaces shall be securely wrapped with a minimum of three layers of not
less than 8-ounces canvas or equivalent. Canvas seams shall be taped with
heavy duty tape such as duct tape. The above protected surfaces shall then be
provided physical protection as specified in 3.15.4.1 or 3.15.4.2 at the
option of the packaging activity. The methods specified in 3.15.4.1 and
3.15.4.2 shall not be combined on the same shaft.
NRFI shafts with used
sleeves do not require packaging of the shaft sleeve areas.
3.15.4.1 Galvanized covering. Shafting shall be covered by application
of approximately 0.0179 + 0.005-inch thick (26 gauge) galvanized steel wrap
secured by means of flat, nailless type corrosion resistant (stainless steel)
bands. The horizontal seams of the steel wrap shall be positioned on the
bottom to prevent the entry of water or other foreign matter under the steel
wrap. There shall be a minimum of two stainless steel bands per sheet of
galvanized steel wrap placed 6 inches in from each end of the wrap. Additional
sections of galvanized steel wrap shall overlap the adjoining section by a
minimum of 2 inches. All seams shall be covered with a double layer of tape
in accordance with MIL-T-22085, type II or type IV.
3.15.4.2 Wood lagging. Shafting shall be covered by application of
nominal 1- by 2-inch wood strip lagging (as shown on figure 14) running the
entire length of the protected surface. Wood materials utilized for wood
lagging shall be as specified in 3.8.2.2 for multiple trip use. Lagging
strips shall be spaced a maximum of 1 inch apart and shall be secured in place
by means of flat, nailless type corrosion resistant (stainless steel) bands.
The bands shall extend around the circumference of the shaft and shall be
clamped with stainless steel cleats. There shall be a minimum of two straps
for each section of wood lagging. Identified sling points of the shaft shall
have an additional layer of wood lagging, 2 feet long, centered on the sling
point.
3.15.5 Shaft flanges. Shaft flange faces shall be protected by means of
a 2-inch nominal thick wood disk of greater diameter than the flange, which
shall be secured to the flange faces. Wood materials utilized for flange faces
shall be as specified in 3.8.2.2 for multiple trip use. A layer of barrier
material in accordance with MIL-B-121, type I, grade A, class 2, shall be
placed between the wood disks and metal surfaces. Flange peripheries shall be
protected by the use of wood lagging as specified in 3.15.4.2.
3.15.6 Shaft packing.
3.15.6.1 Three inches in diameter and less. Shafting, 3 inches in
diameter and less, shall be packed in wood boxes in accordance with PPP-B-621,
style 1, modified as shown on figure 15 herein. Wood materials utilized for
container construction shall be as specified in 3.8.2.2 for multiple trip use.
Table III specifies sizes of members for boxes depending on shaft diameter,
shaft length, and shaft weight. Container sides, ends, top, and bottom shall
be one piece or Linderman jointed and without end butt joints for lengths up
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