web rigging services ltd - pressure testing
TRANSCRIPT
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WEB RIGGING SERVICES LTD
Workplace-Segregation Net for
Pressure Testing
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Introduction
Identified a market need for high-rated netting Provides safe workplace-segregation and mobility
Significant potential time savings when pressure testing
Sourced materials and developed a prototype Structural model indicates good safety margin
Next steps are to Complete authoritative laboratory tests (August)
Do practical testing onshore & offshore with a partner WEB seeking collaboration with RBG on practical
testing phase
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WEBs understanding of the
requirement (draft)
Pressure testing is important and frequent
Typically NPT valve or plug
Pressure 10-1034 bar
Offshore Pressure Testing
Follows change-out of systems
Typically requires evacuation of
the drill floor
Can be as frequent as weeklyDuration up to six hours
Drill floor outage for 4% of the
time
Onshore Pressure Testing
Yard testing of assemblies
Protection from steel-framed
railway sleeper barriers
Typically takes place at night Manual handling challenges
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WEB Rigging workplace-segregation
netting for pressure testing
Engineered Solution
Same system onshore and offshore
Rigged under LOLER standards
Improved speed, mobility and storage
Provides overhead and side protection
Fired objects and dropped loads
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Prototype design
Catenery wire
Stainless
Steel
Netting
KevlarMesh
Woven edging
Curtain
pull
Karabiners through non-ferrous eyelets at 300mm
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Specification of
Stainless Steel Netting
Stainless
Steel
Netting
Mesh Size 40mm x 40mm
Stainless Steel or GalvanisedWire
Diameter 3mm
Individual Strand Strength840kg
Ferrule Strength Transverse400kg
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Specification of
Kevlar Matting
Mesh strength 2,000
KgF/cm2
KevlarMesh
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Fired object loading
Load applied as nominal, no load factors are applied
Cable properties:
Assumed 6*19 steel wire fibre core rope
Diameter 16mm
Area of cross section 201mm2
E=49kN/mm2
Breaking load 150kN (max allowed tension 30kN, factor of safety=5)
Calculation prepared by: MHB ConsultantsTechnology House, 9 Newton Place
Glasgow, G3 7PR
United Kingdom
Tel: +44 0141 270 7556
E-mail: [email protected]
mailto:[email protected]:[email protected] -
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FIRED OBJECT LOADS CALCULATION
Structural model of netting: Model consists of two steel ropes and grid structure representing net.
Ropes are fixed at both ends.
No initial pre-stress is applied to ropes.
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FIRED OBJECT LOADS ASSUMPTIONS
Load assumptions: Net is loaded by 21.15kN (2150kg) force applied at the middle of net
This load represents 2.45N (0.25kg) object travelling at the speed 450m/s
and braked over the distance 1.2m.
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FIRED OBJECT LOADS CALCULATION
Max tensile reactions in
ropes: 68kN
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FIRED OBJECT LOADS CALCULATION
Deflection of net:
Max deflection 1.2m
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Dropped object loading
Load applied as nominal, no load factors are applied
Cable properties:
Assumed 6*19 steel wire fibre core rope
Diameter 16mm
Area of cross section 201mm2
E=49kN/mm2
Breaking load 150kN (max allowed tension 30kN, factor of safety=5)
Calculation prepared by: MHB ConsultantsTechnology House, 9 Newton Place
Glasgow, G3 7PR
United Kingdom
Tel: +44 0141 270 7556
E-mail: [email protected]
mailto:[email protected]:[email protected] -
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DROPPED OBJECT LOADS CALCULATION
Structural model of netting: Model consists of two steel ropes and grid structure representing net.
Ropes are fixed at both ends.
No initial pre-stress is applied to ropes.
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DROPPED OBJECT LOADS ASSUMPTIONS
Load assumptions: Net is loaded by 22.3kN (2270kg) object, plan of loading 0.5*0.5m.
This load represents 1.23kN (125kg) object dropped from a height of
20m and braked over distance 1.1m.
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DROPPED OBJECT
LOADS CALCULATION
Max tensile reactions in
ropes: 70kN
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DROPPED OBJECT
LOADS CALCULATION
Deflection of net:
Max deflection 1.1m
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Discussion & Next Steps