MIL -PRF-53012A
7 to 1, based on the wire rope nominal strength, shall be used to determine the wire rope size for
each kit as follows:
3.4.1.1 Type I kit. The wire rope shall have a working load limit of approximately 3,000 pounds.
3.4.1.2 Type II kit. The wire rope shall have a working load limit of approximately 1,700 pounds.
3.4.2 Fiber rope. The fiber rope shall be regular lay with a safety ratio of 10 to 1 based on
the fiber rope nominal strength. The rope shall be one continuous length, spool mounted and
capable of floating in water. The spool, with rope, shall fit with other items in the storage chest
specified herein. The working load limit for fiber rope for each type kit shall be as follows.
3.4.2.1 Type I kit. The fiber rope shall have a working load limit of approximately 420 pounds.
3.4.2.2 Type II kit. The fiber rope shall have a working load limit of approximately 270 pounds.
3.4.3 Wire rope clip. The wire rope clip shall be the saddle and U-bolt type, and shall be
galvanized. Type I kit clips shall be suitable for securing the wire rope selected in accordance
with 3.4.1.1. Type II kit clips shall be suitable for securing the wire rope selected in accordance
with 3.4.1.2.
3.4.4 Shackle. The shackle shall be sized to fit over the wire rope selected by type kit in
accordance with 3.4.1. The shackle shall have a secured pin and be galvanized. Each shackle
shall have a working load limit of approximately 2,000 pounds for a type I kit and approximately
1,000 pounds for a type II kit.
3.4.5 Hose saddle. The hose saddle shall be made of a flexible material and shall provide
support to the hoseline when attached to a shackle ( see 3.4.4) that is suspended from the wire
rope (see figure 1). The saddle shall be of sufficient width to prevent the hoseline, when filled
with liquid, from crimping or deforming at the suspension point. The shackle connection areas
may be reinforced but shall fit into the shackle opening. The hose saddle shall be the same in each
type kit.
3.4.6 Anchor. A means to anchor the wire rope at each end, as the suspension kit is installed
and during its operational life, shall be provided. The anchors shall hold fast as the wire rope
comes under tension during installation and hoseline use. The anchors shall provide a place of
attachment for a shackle that fastens to a turnbuckle or the hoist. For type I kits, the hoist shall
be installed to be used on one end as a temporary tensioning device, when a turnbuckle cannot be
used to increase the tension, then replaced by a turnbuckle when the installation is complete. The
anchors shall be capable of being installed by hand. The selected item may be ganged to provide
the required holding force and to keep the item small and easy to handle. If a drive type anchor is
selected, a driving tool and, if necessary, a driving cap shall be supplied to prevent end
mushrooming. The required holding force shall be equal to the working load limit of the wire
rope specified in 3.4.1.1 for a type I kit, and 3.4.1.2 for a type II kit.
3.4.7 Block. The block shall be single sheave, steel shell tackle block, and sized to accept the
type kit wire rope identified in 3.4.1.1 and 3.4.1.2. A self locking swivel hook on the block with a
minimum working load limit of 3.000 pounds shall be acceptable for a type I kit and a working
load limit of 2,000 pounds for a type II kit.
3
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business