BS 2890:1989

Foreword
Committees responsible
Specification
1 Scope
2 Definitions
3 Materials and components of construction
4 Belting
5 Belt edge clearance
6 Pulleys
7 Idlers and idler sets
8 Transition distances
9 Take-up devices
10 Power calculations
Appendices
A Information to be supplied by the purchaser
B Information to be supplied by the manufacturer, if
    required
C Capacity and cross section of a conveyor with a
    smooth patternless belt
D Equation for calculating idler pitch for maximum sag
    of 2 %
E Pitch of idler sets
Tables
1 British Standards for materials and components to be
    used in the manufacture of troughed belt conveyors
2 Belt widths
3 Belt edge clearance
4 Minimum pulley face length
5 Pulley nominal diameters
6 Minimum pulley diameter appropriate to belt
    construction
7 Nominal outside diameters of carrying and return
    idlers
8 Nominal lengths of carrying and return idlers
9 Minimum radial clearance for carrying idlers
10 Nominal lengths of carrying and return idlers
    appropriate to belt widths
11 Mounting dimensions of carrying and return idler
    sets appropriate to belt width
12 Nominal outside idler diameters and related belt
    speeds
13 Impact ring for carrying idlers outside diameter
14 Discs for return idlers outside diameter
15 Maximum cross section of the handled material, S,
    for triple-roller troughed belts in accordance with
    figure 23 with equal-length carrying idlers
16 Typical pitch of idler sets with troughing angle up
    to 35 degrees
Figures
1 Typical troughed belt conveyors
2 Typical forms of drive
3 Typical forms of take-up device
4 Typical travelling tripper
5 Typical arrangement of troughed belt shuttle
    conveyor
6 Typical plough
7 Belt edge clearance
8 Idler dimensions
9 Plan views of in-line and staggered carrying idler
    sets
10 Part view of in-line idler set in vertical plane
11 Part view of staggered idler set in vertical plane
12 View in vertical plane showing angle of inclination
    of wing idlers for troughed carrying idler sets
13 Side elevation of wing idler with forward tilt
14 Side elevation of carrying idlers
15 Single flat return idler
16 Two return idlers in vee form
17 Plan view of vee return idler
18 Clearance between return idler and supporting
    structure
19 Nominal idler lengths for three-idler carrying sets,
    flat and vee return idlers
20 Mounting dimensions of carrying and return idler
    sets
21 Impact ring dimensions
22 Disc dimensions
23 Trough section with three carrying idlers
24 Factor k as a function of slope angle delta