BS/EN 1765-2016 pdf download.Rubber hose assemblies for oil suction and discharge services – Specification for the assemblies.
5.2.3.2 Hose assemblies
Three types of assembling are possible:
— with built-in hoses nipples.
— assembled with hose nipples and clamps in accordance to EN 14420-2, EN 14420-3. and EN 14420-4,
— assembled with hose nipples in accordance to EN 14420-2 and swaged or crimped ferrules.
When built-in nipples are used the embedded wire helix (helices) shall be spiralled over the nipples to a point at least between the first and second bands and shall be finished off with at least two turns anchored together by soldering, clipping, welding or a combination of these.
Where built-in nipples are used for electrically continuous hose assemblies, the end of the wire helix shall be electrically bonded to the nipples by brazing, welding or by soldering a short flexible bonding wire to the end o[the helical wire and the nipple.
5.2.4 Type L: Electrically continuous or electrically discontinuous
5.2.4.1 Hoses
I-loses shall comprise of:
a) a lining conforming to the requirements given in 5.1.1, which shall be smooth and reasonably free from scores or indentations and shall be substantially flush with the nipples when built-in nipples are used for assemblies;
b) a breaker fabric incorporated between the lining and reinforcement when fine wire reinforcement is used;
c) reinforcing plies of either textile or fine wire thoroughly impregnated with rubber; the ends of the hose adjacent to the nipples shall have extra reinforcement to reduce the flexibility of the hose/nipple junction; textile reinforcing plies shall incorporate at least two electrical bonding wires consisting of at least nine strands of wire having a high resistance to fatigue and continuous throughout the reinforcement.
Reinforcing plies of either textile or fine wire thoroughly impregnated with electrical conductive rubber
are also allowed;
d) a smooth outer rubber cover conforming to the requirements given in 5.1.5.
6 End connections
6.1 Nipples and flanges
Nipples and flanges shall be of steel or aluminium alloy (see Annex A).
Nipple tube, bands and other welded-on components shall conform to the requirements of EN ISO 15614-1:2004, Table 3, Group 1 with a minimum yield stress of 205 N/mm2, a minimum tensile strength of 331 N/mm2 and a maximum carbon content of 0,23 %.
Nipples shall be screwed, with a thread conforming to ASME B.1.20.1, or flanged.
Flanges shall be normalized carbon steel forgings with a maximum carbon content of 0,25 % and, where fitted, shall be drilled in accordance with a standard drilling table relating to the purchaser’s requirements and the pressure designation of the hose
Flanges shall be attached to the nipple by screwing or welding or formed integral with the nipple. They shall be aligned with the nipple so that the deviation in any direction shall not exceed 10.
The flange gasket contact surface shall be machine finished and conform to the requirements given in ISO 7005-1. They shall have a continuous spiral grove generated by a 1,6 mm radius round nose tool at a feed rate of 0,8 mm ± 0,01 mm per revolution.
The use of built-in swivel flanges is recommended when high flexibility and easy handling has been specified (see Annex A).
Flange protection coatings may be specified by the purchaser (see Annex A) but shall not be applied to the flange sealing surface nor the internal surfaces of the flange or nipple. Coatings may be applied either by galvanizing or aluminium or zinc spraying in accordance with the requirements given in EN ISO 2063 to a nominal thickness of 100 lIm, with no localized area being less than 75 tm.
Hot-dip coatings when applied shall conform to the requirements given in EN ISO 1460 and EN ISO 1461.
6.2 Method of attachment of end connections to the hose
For Types R, S and L, end fittings shall be either built-in during manufacture of the hose or assembled with
clamps in line with EN 14420-2. EN 14420-3 and EN 14420-4 or shall be swaged.
For Type A, end fittings shall be built-in during manufacture, or assembled with clamps in line with
EN 14420-2, EN 14420-3 and EN 14420-4 or swaged, or wired in, or strapped.
The exterior of the hose over built-in nipples shall taper smoothly into the body of the hose and no outside bands or clips shall be fitted. The design of the hose body shall be such that threaded bolts appropriate to the flange can be inserted into the flange.
6.3 Electrical discontinuous assemblies.BS/EN 1765-2016 pdf download.