Web Rigging Services Ltd - Pressure Testing

8/22/2019 Web Rigging Services Ltd - Pressure Testing

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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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Max tensile reactions in

ropes: 68kN


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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

Web Rigging Services Ltd - Pressure Testing

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