1. TMC ( T echno M aterial C orp.) 1 Wear Resistant Twin Wall Pipe System

2. TMC ( T echno M aterial C orp.) 2 ▣ Applications of Twin pipe & Twin Elbow for CPT

3. TMC ( T echno M aterial C orp.) 3 ▣ Twin Wall Pipe System ■ Features ● Multi-layer pipe for abrasion resistance piping systems ▶ Inner pipe : hardened steel (HRA 75 ~85 ) ▶ Outer pipe : high ductility low carbon steel (max HRC25) ● High wear resistance ● Absorb impact and contain pressure ● Applicable hydraulic piping system ▶ Concrete pump truck, industrial pipe system

4. TMC ( T echno M aterial C orp.) 4 ▣ Newly Designed Twin wall pipe for CPT – Characteristics Ⅰ Hardened Inner Liner for Abrasion Resistance and High Strength outer Tube -. An inner liner hardened to at least Hv 600 -. A low-carbon outer shell to absorb impact and contain pressure

5. TMC ( T echno M aterial C orp.) 5 Manufacture Inner wall Hardness Outer wall Hardness) Abrasive Wear Impact Wear Process Cost, % Induction Hardening (America) HRC 58 ~ 62 (HV600~680) HRC 20 ~ 25 ◎△ Thermo Mechanical Process △ Flame hardening (Germany) HRC 60 ~ 65 (HV720~800) HRC 20 ~ 25 ◎△ Thermo Mechanical Process △ TMC Ltd. (Korea) HRC 60 ~ 65 (HV 620~780) HRC 20 ~ 25 ◎○ Mechanical Process (patterned) ○ 범례 : ◎ : Excellent, ○ : Good, △ : Moderate, × : poor ▣ Newly Designed Twin wall pipe for CPT – Characteristics Ⅱ

6. TMC ( T echno M aterial C orp.) 6 ▣ Abrasion test (ASTM G65) Twin wall pipe Abrasion test of Hardened Inner Liner -. Long life in highly abrasive applications -. Superior wear resistance to gas flame hardening and induction hardening

7. TMC ( T echno M aterial C orp.) 7 ▣ Field test of Twin wall pipe For CPT TMC twin wall pipe estimated wear rates by CPT -. Lifetime pipe (M 3 ) : min 100,000

8. TMC ( T echno M aterial C orp.) 8 ▣ Applications of Twin wall pipe