Critical and Ultimate Depths

d) Deterioration factor Statutory regulations in South Africa state that the value of B for a rope must never fall below 0.9 of the initial (as new) value of B ie,.B present2 0.9.8 new In this paper all safety factors laid down by Statute have been increased by the factor D before payloads have been calculated. e) Critical and uttimate depths e.1 ) Drum winders e.2) BMR winders e .3 ) Koepe winders Fig 16 Photograph of installation Nos 4 or E (Appendix ll) t-4) Range factor {Koepe only) p aL\J-u.w I*; - ,l ks (/ l- l) ll ar -l '-D Duty Depth (m) Grade of steel in rope MPa I 7s0 I 800 I 9s0 2 000 2 050 Men Mineral Critical Ultimate Critical Ultimate 1 s80 1 619 | 1r3 r 760 1 800 3 160 3 240 3 430 3 520 3 600 | 160 1 803 I 909 960 2 002 3 520 3 605 3 815 3 920 4 000 .\len \l inererl Critical Ultimate Critical Ultimate 1580 3 160 r 941 3 700 1 619 3 240 I 989 3',l90 I 713 3 430 2 105 4 015 | 760 3 s20 2 164 4 125 1 800 3 600 2 2r0 4 220 Duty t,1 r'n T :.era.l Depth (m) Critical Ultimate Min FOS Critical Ultimate Min FOS Grade of steel and No of Ropes I 750 MPa I 800 Pa I rope 2/3 ropes 4in ropes I rope 2/3 ropes 4/n ropes 1000 1415 1835 2 06A 2 250 2 470 1 .s 6.8 75 6.2s 1000 141s 1840 2 290 2 s00 2 750 6.7 s 6.19 5.62 1 000 2 120 7.5 I 41s 1 835 2 320 2 540 6.87s 6.2s 1 000 I 415 I 835 2 3s0 2 s70 2 820 6.7 5 6.19 5.62 -t I Formulae Drum winders ,fur)e - w e8r DF(t+ 1)>P=- BMR winders tlw D <-- '- t+ I Fig 15 Photograph of installation No 1 (Appendix il) & {rro' I I nt' D; Ll kg As for drum winders except that for w substitute nw. -i 1 Koepe winders -- rc'r rl ks e.81 D(F-L.dn ) Note: Minimum FoS : minimum value for (F - Z dF) t63

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Transcript of Critical and Ultimate Depths

d) Deterioration factorStatutory regulations in South Africa state that thevalue of B for a rope must never fall below 0.9 of theinitial (as new) value of Bie,.B present2 0.9.8 newIn this paper all safety factors laid down by Statutehave been increased by the factor D before payloadshave been calculated.

e) Critical and uttimate depthse.1 ) Drum winders

e.2) BMR winders

e .3 ) Koepe winders

Fig 16 Photograph of installation Nos 4 or E (Appendix ll)

t-4) Range factor {Koepe only)

p aL\J-u.w I*; - ,l ks(/ l- l) ll ar -l '-D

Duty Depth(m)

Grade of steel in ropeMPa

I 7s0 I 800 I 9s0 2 000 2 050Men

Mineral

CriticalUltimate

CriticalUltimate

1 s80 1 619 | 1r3 r 760 1 8003 160 3 240 3 430 3 520 3 600| 160 1 803 I 909 1 960 2 0023 520 3 605 3 815 3 920 4 000

.\len

\l inererl

CriticalUltimate

CriticalUltimate

15803 160

r 9413 700

1 6193 240

I 9893',l90

I 7133 430

2 1054 015

| 7603 s20

2 1644 125

1 8003 600

2 2r04 220

Duty

t,1 r'n

T :.era.l

Depth(m)

CriticalUltimateMin FOS

CriticalUltimateMin FOS

Grade of steel and No of Ropes

I 750 MPa I 800 MPaI rope 2/3 ropes 4in ropes I rope 2/3 ropes 4/n ropes1000 1415 18352 06A 2 250 2 470

1 .s 6.8 75 6.2s1000 141s 18402 290 2 s00 2 7506.7 s 6.19 5.62

1 0002 120

7.5

I 41s 1 8352 320 2 5406.87s 6.2s

1 000 I 415 I 8352 3s0 2 s70 2 8206.7 5 6.19 5.62

-t

I

FormulaeDrum winders

,fur)e -

w

e8r DF(t+ 1)>P=-BMR winders

tlwD