Mismatched Iron Connections - DrillSafe · Figure 602 – 6,000 PSI Figure 1002 – 10,000 PSI...

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Mismatched Iron Connections Shankar Narayan

Transcript of Mismatched Iron Connections - DrillSafe · Figure 602 – 6,000 PSI Figure 1002 – 10,000 PSI...

Page 1: Mismatched Iron Connections - DrillSafe · Figure 602 – 6,000 PSI Figure 1002 – 10,000 PSI Figure 1502 – 15,000 PSI Figure 2002 – 20,000 PSI Note: Sour Gas Service iron has

Mismatched Iron Connections

Shankar Narayan

Page 2: Mismatched Iron Connections - DrillSafe · Figure 602 – 6,000 PSI Figure 1002 – 10,000 PSI Figure 1502 – 15,000 PSI Figure 2002 – 20,000 PSI Note: Sour Gas Service iron has

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Mismatched Hammer Unions – Ongoing Issue

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Pressure Rating & Figure Number

Figure 602 – 6,000 PSIFigure 1002 – 10,000 PSIFigure 1502 – 15,000 PSIFigure 2002 – 20,000 PSI

Note: Sour Gas Service iron has a lower maximum working pressure for a given Figure number (based on material properties). Standard Service components should not be used in Sour Service, due to differing material properties.

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High Pressure fluid transfers are conducted via fixed HP Rig manifolding and/or temporary HP (dumb) Iron.   

Fig 602 – 6,000 psiFig 1002 – 10,000 psiFig 1502 – 15,000 psiFig 2002 – 20,000 psi

Pressure Rating & Figure Number

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What are “Weco Hammer Unions”?

They are connectors for temporary pipe & flow line installations

FMC acquired the original Weco company in the 1950’s

The design is old, and manufactured by many companiesUsed in steel & chemical plants, dredging vessels, strip mines & in the oil industry

More than a dozen design variationsDesignated by nominal pipe & a ‘Fig’ number

2” 1502

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Definitions

Wing Half Thread Half

Detachable Wing Nut

Segments (3 required)

Male Sub

Female Sub

Wing Nut

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The Hazards

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The Hazards

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Dangerous Union Connection

Same iron size BUT different Figure number and different pressure rating. Examples:

2” 602 thread half & 2” 1502 wing half2” 1002 thread half & 2” 1502 wing half

Note the minimal thread engagement of wing nut thread and female sub thread.

This combination will make up, but will fail under pressure.

Photo Courtesy of FMC

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Mismatching Swivel Joints

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Mismatching Swivel Joints

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Mismatching Swivel Joints

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Basic Practices / Issues

All union connections must be positively identified as compatible for size, Figure number and pressure rating prior to assembly. Ensure iron qualification band is present, accurate and current.Damaged union connections must be immediately removed from service and rendered unusable.The dangerous connections presented here are an Industry-wide problem. These dangers are most likely when connecting to iron from multiple companies (Contractors – Customer – Rig) or by cross mixing manufactures union components.All companies should have iron maintenance and certification program

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List of DON’TS

Do NOT use 2” 602/1002 union components in pumping service

Do NOT mix Standard Service and Sour Service components

Do NOT use Standard Service components in Sour Service

Do NOT use line pipe connections greater than 1” nominal.

Do NOT use de-rated pipework

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Risk Mitigation Ideas

Stringent Industry / Company guidelines/ policies on iron-management processes. Requires commitment & strong controls mechanismsIncrease focus/awareness at field level through training/ on site induction discussions/ tool box meetings/ display posters. SOP’s / JSA’s to address mismatched iron. Human dependenceMove away from the use of 602’s. Do we need them? Challenge with some operators.Clearly tag / label iron. IdentificationMandate the use of go-no-go gauges. Perhaps the last line of defense!

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GO / NO-GO Gauges

• When there is uncertainty – use the GO / NO-GO Gauge to ensure it is a 1502Thread Half (female union).

• Identify markings

Types of Go-No-Go Gauges

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GO / NO-GO Gauge Usage Procedure

• If the gauge fits over the threads as shown below, the connection is unsafe; do not use

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GO / NO-GO Gauge Usage Procedure

• If the gauge does not fit over the threads as shown below, the connection issafe

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Questions/ Comments


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