OQST -1421 Repair of Imperfections or Damage of Steel Pipe

Reasons repairs are Needed

100

Any pipeline that is unsafe to operate should be?

Replaced, Repaired or Abandoned.

200

What are some reasons that cause the need to repair pipelines include?

Component Failure, Corrosion, Welds, Contacts & Third Party Damage.

300

Certain components are prone to failure due to their mechanical nature such as with?

1. Normac Couplings

2. Dresser Couplings

3. Continental Tees

4. Kerotest Valves

5. Hydraulic Couplings

400

Rubber compression seals may?

Deteriorate, Loosen & Leak

500

This coupling is No Longer used @ WG and has a History of Failure?

What are Posi - Hold couplings.

Reasons repair is needed for: Component Failure, Gate Valves, Corrosion, Welds, Contacts

100

Gate Valves begin to fail due to?

1. Body Cracks

2. Packing

3. Bolts Breaking

200

What are the reasons Corrosion occurs on piping?

1. Bare Steel with no cathodic pertection

2. Damaged wrapping

3. Failure of cathodic protective measures

4. Stray Current

5. Damage by pinning

300

Welds can fail over time due to?

1. Pipe Stress

2. Corrosion

3. Settlement

400

This can damage coating leading to corrosion?

Contacts with other Utilities piping.

500

Service Tees and saddles may leak due to?

1. Compression Rubber Failure

2. Corrosion

3. Third party damage

Methods for repairing Pipelines for: Steel, Sleeves, Kill Pins, Encapsulation, Leak clamps

100

Make temporary repairs for?

Public Safety..

200

this is welded into leaking welded Tees to shut off gas for a permanent repair?

What are Kill Pins?

300

Weld over sleeves are used to cover leaking _______ & ______. 

Couplings & Fittings.

400

This is the Preferred method of repair for leaking compression couplings?

What is Encapsulation?

500

Typically a ______ would be installed or a _________ welded next to the repair for the new service tee location.

What is a Saddle and a Threadolet?

Methods for repairing pipelines with: Leak clamps, Valve / fitting Replacement, Mechanical Adjustments

100

Mechanical adjustments are necessary when?

Mechanical parts loosen or Require grease, Oil & Packing.

200

These Leak clamps are considered permanent repairs?

Full seal

Half seal

Skinner clamps

300

you follow the manufacturers instructions?

When installation of leak repair devices & apply protective coating as required.

400

Leaks on fittings or Valves due to corrosion may require replacement of the __________ or _______?

Fitting or Valve.

500

Mechanical adjustments include?

Grease, tightening, Oiling, valve packing

Testing Repairs & Replacement Pipe & AOC's

100

U should _______ _______ any pipe before being reactivated?

Pressure Test...

200

Cannot find requirements for repair?

Human Error AOC.

300

U should _______ ______ any fitting not included in a pressure test?

Soap Test.

400

Equipment failure?

Equipment Performance Error.

500

Leaks , Repairs, Replacement & Alterations records are maintained for the ______ of the pipe?

Life.