BS 302-4:1987 download free.British Standard Stranded steel wire ropes Part 4 Specification for ropes for lifts.
1 Scope
This Part of BS 302, which consists of three sections, specifies the requirements for single and dual tensile steel wire ropes for lifts and is for use in conjunction with BS 302 : Part 1.
Section two applies to suspension and ancillary ropes for electric lifts which:
(a) are new;
(b) have been modified to use 1370/1770 grade dual tensile rope; or
(c) are capable of using 1370/1770 grade dual tensile rope.
NOTE 1. Section two is generally aligned with ISO 4344 except that the 1770 grade single tensile ropes which are not used in the UK are not included. It also aligns with and is complementary to BS 5655:
Part 1 which is the English language edition of EN 81: Part 1.
Section three applies to suspension and ancilliary ropes for existing electric lifts that require replacement of 1 180/1 770 grade ropes and are not capable of accepting the ropes specified in section two with higher tensile outer wires.
NOTE 2. The ropes in section three were previously specified In BS 329, and include some nonpreterred sizes.
NOTE 3. Information to be given by the purcher on the enquiry and order is given in appendix F of BS 302: Part 1: 1987.
NOTE 4. Recommendations for the handling, use and care of steel wire ropes for electric lifts are given in appendix A
NOTE 5. Th. titles of the publications referred to in BS 302-4 arc listed on the inside back page.
2 Definitions
For the purposes of this Part of BS 302, the definitions given in BS 302 : Part 1 apply.
3 Compliance
1570 grade and 1370/1770 grade ropes shall comply with the requirements of sections one and two of this Part and with BS 302 : Part 1. 1180/1770 grade ropes shall comply with the requirements of sections one and three of this Part and with BS 302: Part 1.
4 Material
4.1 Wire
4.1.1 General. The wire used for the manufacture of wire ropes to BS 302-4, as shown in table 2, shall comply with sections one and two of BS 2763: 1982. The mechanical tests shall be confined to the tensile strength and torsion requirements.
4.1.2 Wire finish. The wire shall be bright or zinccoated.
NOTE. It will need to be stated by the purchaser on his enquiry and order if zinc.coated wire is required, otherwise bright wire will be supplied.
4.2 Rope core
The core shall be of fibre and shall comply with 3.2 of
BS 302: Part 1: 1987.
4.3 Joints
Wires of over 0.25 mm diameter shall be joined by welding or brazing. Wires below these sizes shall be welded, brazed or tucked.
5 Direction of lay
Ropes shall be of right-hand lay or of left-hand lay.
NOTE. For economic reasons right-hand lay is preferred and will be supplied. It will need to be stated by the purchaser on his enquiry and order if a left-hand lay rope is required.
6 Diameter and ovality tolerances
6.1 Diameter tolerances
When measured in accordance with appendix A of BS 302:
Part 1: 1987. under no load and under a load of 10 % of the minimum breaking load (MBL). the actual diameter shall be equal to the nominal diameter with a tolerance in accordance with table 1.
6.2 Ovality tolerances
The maximum variation between any of the four measurements made in accordance with appendix A of BS 302:
Part 1: 1987 under no load or under a load of 10 % of the minimum breaking load shall not exceed 3 % of the nominal diameter.
7 Lubrication
The rope shall be lubricated in stranding and wiped well back.
The main fibre core shall be adequately lubricated. Lubricants shall comply with 3.3 of BS 302: Part 1: 1987.
8 Wire rope constructions and sizes Constructions and size ranges shall be as given in table 2.
12 Minimum breaking load
For the purposes of clause 7 of BS 302: Part 1: 1987.
the minimum breaking loads shall be as given in tables 5
and 6.
NOTE. For guidance, these tables also giv, approximate masses of ropes, calculated as in C.2 of BS 302: Part 1:1987.