MIL-STD-2042-3B(SH)
(4) Fumetight bulkheads.
(5) Multiple cable (two or more) penetrations through non structural steel bulkheads (other than mesh or expanded metal), bents, web frames, transverse girders and longitudinal girders.
Cable penetrations of vertical non-tight structures within a compartment need not be sealed at intervals closer than 20 feet horizontally. However, if one penetration on the structure requires sealing, then all penetrations of that structure shall be sealed.
d. Metal stuffing tubes in accordance with MIL-S-24235/1 shall be used to penetrate pressure proof submarine bulkheads and surface ship sonar domes that are filled with water under normal operating conditions. One half of the tube may be used to penetrate surface ship sonar domes only.
e. The size of the stuffing tube groups shall be limited to permit tightening of gland nuts in the group using stuffing tube wrench set type II, class
I, style A, form B in table IV of GGG-W-646. Penetration spacing shall be as specified in DDS 100-2.
4.1.2 Plastic sealer. Plastic sealer, type HF as specified in MIL-I-3064 shall be used to seal the space around the cables in collars or nipples used for passing cables through light tight and fume tight bulkheads.
4.1.3 Kickpipes. Kickpipes (see 3.4) shall be made of a material to suit the structure being penetrated and shall be compatible with the stuffing tube material. Pipe ends shall be chamfered and inside wall burrs shall be removed to prevent chafing of the cable jacket. Swage tubes in accordance with MIL-S-24235/17 or MIL-
S-24235/18 may be used as an alternative to stuffing tubes in accordance with MIL-S-
24235/9.
4.1.4 Multiple cable penetrators (MCP's). MCP's shall be in accordance with
MIL-P-24705.
4.1.5 Metal stuffing tubes. Metal stuffing tubes shall be in accordance with
MIL-S-24235/1, MIL-S-24235/2, MIL-S-24235/9 or MIL-S-24235/10.
4.1.5.1 Stuffing tube packing. Packing for stuffing tubes that penetrate submarine pressure proof and surface ship ballistic bulkheads, and sonar domes
filled with water under normal operating conditions shall be in accordance with MIL- S-24235/1. For all other metal stuffing tubes, packing shall be in accordance with either the preformed (coil), class 2 or the bulk, class 1 of MIL-P-16685. When bulk packing is used, the first and last turns shall be part A (hard) and the
intermediate turns shall be part B (soft). Reinforced neoprene packing in accordance with class 1 of MIL-PRF-15624 may be used as an alternate.
4.1.6 Chafing collars and nipples. Collar length shall be not less than 76 mm (3 in) with a minimum radial distance between the cable and collar of 25 mm (1 in). Nipple length shall be not less than 51 mm (2 in), with a minimum radial distance between the cable and the nipple of 6 mm (0.25 in).
4.1.7 Shielded compartment penetrations. Because optical fiber cables contain no metallic shields, normal compartment penetrations may not adequately maintain the shielding integrity of shielded compartments. Where the shielding integrity of the compartment must be maintained, special penetration methods may be required for optical fiber cables. Information on special penetration methods to maintain shielding integrity can be obtained from the Naval Surface Warfare Center (see
3.1.1).
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