MIL-DTL-2845 Propulsion Systems, Boat And Ship; Main Shafting, Propellers, Bearings, Gauges, Special Tools, And Associated Repair Parts; Preservation, Packaging, Packing And Storage OfThis specification covers the cleaning, drying, preservation, packing, marking, and storage of main propulsion shafting, line shaft bearings, stern tube and strut bearings, boat and ship propellers, propeller devices including controllable pitch propellers, shafting, and accessories thereto. It also covers repair parts, tools, and independently mounted main propulsion thrust bearings.

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MIL-DTL-2845E (SH)

3.15.11 Shaft storage. Steel shafting shall be stored in an east-west

direction to avoid build up of residual magnetism. Temporary storage of semi-

finished or finished shafting prior to preservation or packaging shall be on a

flat concrete or steel surface with cradles spaced at a maximum of every 4

feet for shafts greater than 15 feet in length with adequate weight bearing

capacity. Storage of preserved and packaged shafting shall be on a flat

concrete or steel slab with a weight bearing capacity greater than the weight

of the shaft with packaging. Shafting shall be stored in a warehouse when

possible. When warehouse space is not available, shafting shall be stored in

open covered storage. Open covered storage is defined as storage inside an

open-type cover consisting of sides, ends, and top. The cover may be of the

nailed or demountable type, and of wood or metal construction. The enclosure

shall provide for impact and weather protection. Access areas such as a door

shall be constructed to permit personnel entry into the covered storage for

inspection of the shaft. A clearance of not less than 12 inches shall be

allowed between the shaft and closest member of the container cover. When in

open covered storage, a flexible, waterproof cover shall be placed over the

container. Packaged shafts shall not be stacked. The following

specifications shall be used for guidance in material selection, fabrication,

and assembly of the cover:

Cover - MIL-C-3774, MIL-C-9897, or ASTM D 6039.

3.16 Built-up and controllable-pitch propeller hubs. Preservation for

built-up and controllable-pitch propeller hubs shall be Level A in accordance

with this specification unless otherwise specified. Alternate methods for

controllable-pitch propeller hub preservation may be utilized with the prior

approval of the contracting activity.

3.16.1 Preservation of internal surfaces. Each hub shall be filled

with the system's normal operating hydraulic fluid, if applicable. An

expansion tank with a sight glass to determine the expansion tank fluid level

shall be provided to protect the hub against temperature changes and to ensure

that the fluid completely fills the hub at all times. Hub openings shall be

sealed to prevent leakage during handling, shipment, and storage. Moving

parts shall be secured or cushioned in a manner to prevent damage during

handling, shipment, and storage. Each hub shall be tagged stating that the

hub is filled with the normal operating lubricant, its identification (for

example, specification type), including precautionary information necessary

for hub handling, shipment, and storage.

3.16.2 Preservation of external surfaces. Built-up and controllable-

pitch propeller hubs shall be cleaned in accordance with NAVSEA S9245-AR-TSM-

010/PROP, utilizing the same cleaning process for propellers. External

surfaces, including hub opening blanks, shall be covered with a transparent

preservative in accordance with MIL-PRF-16173, grade 4.

3.16.3 Built-up and controllable-pitch hub packing. Built-up and

controllable-pitch propeller hubs shall be packaged as shown on figure 17.

Each hub greater than 200 pounds shall be cradled and secured to a skid-type

base. Other hub boxes shall be in accordance with PPP-B-601 (overseas type) or

PPP-B-621, class 2. The skid-type base shall be of a design and construction

format similar to the skid bases specified in MIL-C-104. Wood materials

utilized for container construction shall be as specified in 3.8.2.2 for

multiple trip use. Anchoring of the hub shall be in accordance with the

appendix to MIL-C-104. A neutral barrier material shall be applied to all wood

surfaces that come in direct contact with the hub or cap. For hubs mounted on

skid-type bases, further protection shall be provided by an open-type, bolted,

wood cover (sides, ends, and top) constructed similar to MIL-C-3774, type II,

except that MIL-C-104 shall be used for guidance in selection of sizes of

members and hardware for the cover assembly and fastening to the skid-type