Sivut kuvina
PDF
ePub
[blocks in formation]

1,140,000

7,900 1,640,000 | 10,800 7,900 2,000 1,000 | 1,200 39 1,645,000 | 11,700

2,000 | 1,000 1,200 33

2,500 1,200 1,500 5,800 910,000

6,300 5,800 | 1,200 600 800 23 7,200

1,400

700 900
8,100
1,400 600

900

41 6,400 1,680,000

7,900

6,400 1,400 700 1,000 32 1,530,000 7,800 1,700,000 9,500 7,800 1,200 900 900 | 37 7,100

750 25 11,200 2,390,000 16,000 11,000 2,000 1,200 1,800 50

11,700

1,500 1,200 1,500 83 1,255,000 9,550

1,500 1,200 1,500 53 10,000

49

Weight in

Cubic Foot. The one Pounds per

9,200 1,970,000 11,400 8,100 1,740,000 10,800 9,600 2,090,000 13,100 9,040 1,851,500 11,300

9,200 1,400 900 | 1,200
8,100 1,400 900 1,200
9,600 1,700 1,000 1,500

45 45 50

38

10,000 2,070,000 | 12,600 9,500 1,600 1,000 1,500
11,100 2,370,000 13,600 10,640
9,200 2,050,000 | 11,300 9,400 1,600 900 1,200
6,400 1,390,000 7,900 6,400 1,200 700 900

6,500

900 600 750 1,400,000 8,000

1,200 700 900

33 24

26

[blocks in formation]
[blocks in formation]

MM. 12.7 11.8 11.0 10.2 9.4 8.8 8.2

1,649

770 6/0 5/0 4/0 3/0 2/0 0 1 2 3 4 5 6 7 8

7.6

In. .500 .464 .432 .400 .372 .348 .324 .300 .276 .252 .232 .212 .192 .176 .160 .144 .128 .116 .104 .092 .080 .072 .064 .056 .048 .040 .036

Sq. In. .1963 .1691 .1466 .1257 .1087 .0951 .0824 .0707 .0598 .0499 .0423 .0353 .0290 .0243 .0201 .0163 .0129 .0106 .0085 .0066 .0050 .0041 .0032 .0025 :0018 .0013 .0010

7.0 6.4 5.9 5.4 4.9 4.5 4.1 3.7 3.3 3.0 2.6 2.3 2.6 1.8 1.6 1.4 1.2 1.0 0.9

Lbs. Lbs. 193.4 | 3,404 166.5 | 2,930 144.4 | 2,541 123.8 2,179 107.1 1,885 93.7 81.2 1,429 69.6 1,225 58.9

1,037 49.1 864 41.6 732 34.8 612 28.5 502 24.0 422 19.8

348 16.0 282 12.7 223 10.4 183 8.4 148 6.5 114 5.0 88 4.1 70 3.2 56 2.4

42 1.8 32 1.2 21 1.0 18

Yds.

58 67 78 91 105 120 138 161 190 228 269 322 393 467 566 700

882 1,077 1,333 1,723 2,240 2,800 3,500 4,667 6,222 9,333 11,200

Lbs. 43,975 37,854 32,823 28,144 24,354 21,302 18,464 15,831 13,398 11,169 9,467 7,904 6,486 5,450 4,503 3,648 2,882 2,368 1,903 1,489 1,126

912
721
552
406
281
228

10 11 12 13 14 15 16 17 18 19 20

NOTES ON THE USE OF WIRE ROPE.

[blocks in formation]

= 49

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

= 55

For VERTICAL WINDING at high speeds, one-tenth the breaking strain has been adopted as a safe working load; it may, however, be increased to one-eighth, according to conditions of working. The gross weight hanging over the pulley (including rope) being considered the working load.

HAULING ON INCLINÉD PLANE. — The working load is usually taken at one-sixth the breaking strain, and the following formula for ascertaining the load has been found from experience to give satisfactory results :

Plane, 800 yds. Load, 20 tons.
Maximum inclination 7 degs. or 1 in 8.14.

Cwrs. QRs. LBS.
Gravity of load, 20 tons X
272.98 lbs. per ton

0 16 Friction of load, 20 tons X 20 lbs. per ton

3 2 8 Gravity of rope, 800 yds. at 2.15 lbs., 1720 = 8.14

1 3 15 Friction of rope, 1720-20 = 0 3 1 2. Plough steel rope

1 12 UNCOILING WIRE ROPE.- A reel or turntable should be used to avoid “kinks" sharp bends.

LUBRICATION OF ROPES. - Both winding and hauling ropes should be well oiled to prolong duration. The winding rope especially ought to have frequent applications of heavybodied hydro-carbon oil, which should be well rubbed into the interstices with a swab, as it is important that the inside of the rope should benefit as well as the outside by its application.

N.B. - An unlubricated rope stood 16,000 bends before fracture, whilst the same rope lubricated stood 38,700.

0.63 57.29 39.08
1.26 | 28.63 78.18
1.88 19.09 117.24
2.51 14.29 156.26
3.15 | 11.42 195.24
3.78 9.51 234.14
4.42
8.14

272.98
5.06
7.11

311.74
5.70 6.31 350.40
6.34 5.67 388.97
6.99 5.14 427.41
7.65 4.70 465.71
8.31 4.33 503.88
8.97 4.01 541.90
9.64

3.73 579.75 10.32 3.48 617.43 11.00 3.27 654.90 11.69 3.07 692.20 12.39 2.90 729.27 13.10 2.74 766.12 13.82 2.60 802.74 14.54 2.47 839.12 15.27 2.35 875.23 16.02 2.24 911.09 16.78 2.14 946.66 17.56 2.05 981.94 18.34 1.96 | 1,016.93 19.14 1.88 1,051.61 19.95 1.80 1,085.97 20.78 1.73 | 1,120.00 21.62 1.66 | 1,153.68 22.49 1.60 1,187.02 23.37 1.54 1,219.99 24.28 1.48 1,252.58 25.20 1.42 1,284.81 26.15 1.37 1,316.62 27.12 1.32 1,348.05 28.12 1.28 1,379.07 29.14 1.23 1,409.67 30.21 1.19 1,439.84

or

PROOF OR TEST LOAD FOR CHAINS.

d=Diameter of Iron in Inches.
The Admiralty Rules are:

Test Load in Tons = 18d2 for Studded Links.
Test Load in Tons = 12d2 for Unstudded Links.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small]

The practice at Elswick is to make the test load 10 per cent. higher than the Admiralty test load.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors]
[merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small]

W=BREAKING LOAD IN LBS. DE SIZE OF CHAIN IN INCHES.
THE SAFE LOAD MAY BE TAKEN AS ONE QUARTER OF BREAKING LOAD.

FIG. 105.

« EdellinenJatka »