HSE: Industrial rope access - investigation into items of personal ...

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Slippage (m) 3.00 2.50 2.00 1.50 1.00 0.50 0.00 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Impact force (kN) Note: Maximum slip limited to 2.5 m by test rig. Figure 23 Type A Back-up devices – dynamic performance 41 Stick Run Microcender Rescucender Shunt Stop & Go Stopfor D Rocker
• Minimum static strength (section 4.2.4 pr EN12841 May 2000) Hold a force of 12 kN for three minutes. The relationship between the minimum working and minimum static strength test is based on factors of safety. With a minimum working strength of 4 kN the 12 kN static test gives a safety factor of 3. The severity of this test is dependent on the amount of damage the device is allowed to sustain. All devices require a stop on the anchor line, usually a knot, to prevent slippage at such high forces, and this causes abnormal loadings that can damage the device. As long as the device does not release or damage the rope it is argued that some deformation here is acceptable. Any evidence of fracture, however, should constitute a fail. A device should also be considered as ‘failed’ if it becomes unusable. In the minimum static strength only one test, on Edelrid rope, was performed due to the expense (and availability) of destroying up to four of each device. The rope is irrelevant in this test as it simply acts as a stop against which the device can be pulled. • Ultimate static strength Initially it was intended as a final test to load all the devices to destruction. However the severity of the minimum static strength test meant that most devices had already reached their limits during this test. The devices which were apparently still usable were those with a machined aluminium body. It was deemed not necessary to test these devices to their ultimate strength for two reasons: it is extremely unlikely, even with abuse, that forces will exceed 12 kN in the workplace the devices would have been tested on a knotted rope and knot strength would have limited the maximum force which could have been applied to the devices. 42
Page 1 and 2: HSE Health & Safety Executive Indus
Page 3 and 4: © Crown copyright 2001 Application
Page 5 and 6: 8.6 PETZL “ABSORBICA”..........
Page 7 and 8: 1.2 AIMS, OBJECTIVES AND SCOPE 1.2.
Page 9 and 10: 1.4.3 Verification For the tests to
Page 12 and 13: 2.1 INTRODUCTION 2 ROPES Ropes are
Page 14 and 15: The ropes are all fundamentally of
Page 16 and 17: 3.1 INTRODUCTION 3 KNOTS Terminatio
Page 18 and 19: Unlike the double overhand and doub
Page 20 and 21: It is unique in that it can be easi
Page 22 and 23: On most of the tests with low-stret
Page 24 and 25: Strength kN 26 24 22 20 18 16 14 12
Page 26 and 27: 3.4.2 Bird droppings Sections of ro
Page 28 and 29: 4.1 INTRODUCTION 4 ANCHOR FORCES Th
Page 30 and 31: 4.4 WORK POSITIONING A combination
Page 32 and 33: 4.6 RIGGING The technician remained
Page 34 and 35: 5.1 INTRODUCTION 5 ROPE PROTECTORS
Page 36 and 37: 5.7 COMPRESSED AIR FLEXIBLE HOSE PI
Page 38: Another point to recognise is that
Page 41 and 42: The IRATA Guidelines state that the
Page 43 and 44: Devices certified to BS EN 567 10 (
Page 45: In practice this type of test is us
Page 49 and 50: 6.2.5 Komet Stick Run Material: Ste
Page 51 and 52: 6.2.7 Petzl Rescucender Material: A
Page 53 and 54: 6.2.9 SSE Stop & Go Material: Alumi
Page 55 and 56: In the dynamic tests it did not per
Page 57 and 58: 6.2.13 Summary of test performances
Page 59 and 60: 6.3 TYPE B - ASCENDER DEVICES Figur
Page 61 and 62: 6.3.1 Camp Pilot Material: Aluminiu
Page 63 and 64: 6.3.3 Petzl Ascension Material: Alu
Page 65 and 66: 6.3.5 Kong Cam Clean Material: Alum
Page 67 and 68: 6.3.7 Summary At present, most of t
Page 69 and 70: 6.4.2 Tests All devices underwent f
Page 71 and 72: The following table summarises the
Page 73 and 74: 6.4.3 AML Material: Aluminium Weigh
Page 75 and 76: Performance in use: In use the devi
Page 77 and 78: Clockwise rotation of the handle tu
Page 79 and 80: Test performance: The static tests
Page 81 and 82: 6.4.8 Troll Allp Material: Aluminiu
Page 83 and 84: Secondly, the bolt can first be adj
Page 85 and 86: Material Dynamic rope Low stretch r
Page 88 and 89: 8.1 INTRODUCTION 8 LANYARDS (FALL A
Page 90 and 91: 8.3 BH SALA Length 2 m Principle Te
Page 92 and 93: 8.6 PETZL “ABSORBICA” Length 0.
Page 94: Description: The Spanset lanyard co
Page 97 and 98:
9.3 BACHMANN KNOT Figure 55 Bachman
Page 99 and 100:
9.5 FRENCH PRUSIK Figure 57 French
Page 101 and 102:
9.7 PRUSIK KNOT Figure 59 Prusik kn
Page 104 and 105:
11 FUTURE WORK This study has highl
Page 106 and 107:
12 APPENDICES 101
Page 108 and 109:
12.1 APPENDIX 1 PERSONNEL INVOLVED
Page 110 and 111:
12.2 APPENDIX 2 QUESTIONNAIRE - SUM
Page 112 and 113:
12.2.3 Hardware ratings Respondents
Page 114 and 115:
12.2.5 Rope Protectors Table 14 Que
Page 116 and 117:
12.3 APPENDIX 3 ROPE ABRASION Table
Page 118 and 119:
12.4 APPENDIX 4 TEST MACHINES, LOCA
Page 120 and 121:
12.4.4 Rope protectors cycling a lo
Page 122 and 123:
Method for minimum static strength
Page 124 and 125:
12.4.7 Lanyards • Static tests Te
Page 126 and 127:
12.5 APPENDIX 5 ABRASION TESTS: REC
Page 128 and 129:
I. Concrete edge, Lyon canvas prote
Page 130 and 131:
N. Steel edge, PVC “rope bag” (
Page 132 and 133:
T. Paving slab, roll module Start 1
Page 134 and 135:
12.6 APPENDIX 6 KNOTS - STRENGTH TE
Page 136 and 137:
Knot Table 21 Marlow 10.5mm rope (l
Page 138 and 139:
12.7 APPENDIX 7 LANYARDS - STATIC T
Page 140 and 141:
12.8 APPENDIX 8 TYPE A BACK-UP DEVI
Page 142 and 143:
12.9 APPENDIX 9 TYPE A BACK-UP DEVI
Page 144 and 145:
Device & rope type Rope brand SSE S
Page 146 and 147:
12.10 APPENDIX 10 TYPE A BACK-UP DE
Page 148 and 149:
12.11 APPENDIX 11 TYPE B DEVICES -
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
12.14 APPENDIX 14 TYPE C DEVICES- D
Page 156 and 157:
12.15 APPENDIX 15 TYPE C DEVICES -
Page 158 and 159:
12.16 APPENDIX 16 TYPE C DEVICES -
Page 160 and 161:
12.17 APPENDIX 17 LANYARD - DYNAMIC
Page 162 and 163:
12.18 APPENDIX 18 PRUSIK KNOTS Bach
Page 164 and 165:
French prusik Main rope Brand type
Page 166:
CRR 364 ISBN 0-7176-2091-3 £20.00
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