Single wall

Single layer standard (STD)

Single layer hardened (TMP)

Double wall

Long life normal double layer (LLN 2+2.5)

Compact long life top double layer (LLT 1.5+3)

Compact long life light double layer (LLL 1.5+2.5)

Double layer pipes with extended collar (LLN-LLT-LLL)

Long life hard double layer (LLH)

Long life hard chromium double layer (LLHC)