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Failed Double Studded Adapter(Choke Manifold Test – 4th test @ 10,000 psi; equipment failed)

Rig Commissioning – Yard (Jan 28, 2010)

• New double studded adapter (DSA) delivered from pressure testers – ‘ready to go’

• Made up the equipment and readied for testing ~ failed at +/- 10,000 psi (5 minutes into a 10 minute test)

Root Cause – Failure

1. Studs not made-up to the DSA properly – had < ½” make-up

2. No equipment verification ~ both ‘long bolting / short bolting’ evident

Action – Everyone

• Trust-n-verify ~ ensure equipment is inspected & ready to go

− Question stud length anomalies (upon make-up)

• Establish & maintain buffer zones

• Ensure CoW

Barely threaded into DSA

For more information contact: Don McKelvey

1-307-413-4585

4 1/16” 10K x 2 1/16” 10K DSA