API 5L-X60, Insulating Joint

Specification

Insulating resistance value:

≥10MΩ @DC1000V, Maximum voltage:≥3KV

Insulating intensity:

 no breakdown or arc for one minute @2500V 50Hz

Hydraulic testing pressure:

1.5 times of designed pressure

Air-tight testing pressure:

 equivalent to designed pressure

Non-destructive testing:

 All the butt-connectors are 100% ray-detected according to JB4730-94; other pressure welding seams are 100% magnetic power detected.

Groove:

 adopt AP15L standard

Insulating material:

high strength epoxy resin and fiberglass stratification composite material

Bends intensity:

Lengthways≥390MPa Side direction≥290MPa

Pulls stretch intensity:

 Lengthways≥340MPa Side direction ≥240MPa

Compressive intensity:

≥390MPa Water-absorbing≤30mg

Sacks in water behind resistance:

≥5x108Ω Breakdown resistance≥35KV

Assemblies steel:

16Mn JB4726; ASTM A694 F52 F60