MODUK DEF STAN 02-524: PART 1 PDF

All cables fitted outside the hulls of Submarines are to be sheathed with medium density polyethylene and are to be passed through the pressure hull by suitable moulded polyethylene glands. Cables with Polychloroprene (PCP) or Chlorosulphonated Polyethylene (CSP) sheaths are not to be used except when approved by the Ship Support Agency/Marine Electrical Systems 2 (SSA/MLS2). 

The earliest versions of polyethylene hull glands were the screw type fitted to SSK and early SSN and the flange type fitted to early SSBN. A later development resulted in the introduction of the spigot (castellated nut) type hull glands which are fitted to Swiftsure, Trafalgar and Vanguard Classes of Submarines. 

All types of moulded polyethylene spigot type hull glands have been included in this Defence Standard (Def Stan). Also included are multi–stem glands used on existing sonar systems, but these are not to be considered for any new service requirement. 

Two standards of pressure hull spigot are in current use: Imperial (23/8 in dia, 60.32 mm dia) for Swiftsure and Trafalgar Classes, and Metric (62.95 mm dia) for Vanguard Class. Glands in the preferred metric range of Section 7.4 can be supplied with either interface. When ordering, it is necessary to quote the Service Drawing Number (SDN) for the basic configuration and the interface type (imperial or metric), and the lengths of outboard and inboard cable required.