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Megaflexon has successfully manufactured and delivered 6 Single Gimbal Type Metal Expansion Joints, 3 Dual Gimbal Type Metal Expansion Joints, 4 Tied Universal Type Metal Expansion Joints, and a total of 13 units for the Hyundai Chemical HPC Project. 

Tied Universal Type Metal Expansion Joint manufactured this time is 78 inches in diameter and 3800 mmL in length, and is mounted on the turbine unit of a power plant.

For the Bellows, which are the main parts of the Expansion Joint, ASTM B443-N06625 Gr.1 material was used, ASTM A516 Gr 70 for pipe and ASTM A516 Gr 70 for hardware.

The Mammoth Geothermal Complex is a complex of 3 geothermal power stations located at Casa Diablo Hot Springs about 3 miles (4.8 km) east of Mammoth Lakes, California. The complex is owned by ORMAT and operated by its subsidiary Mammoth Pacific.

The complex consists of three binary cycle geothermal power stations, each with a nameplate capacity of 10 MW. Mammoth Pacific 1 (MP1) was commissioned in 1984 and was the first air-cooled geothermal power station in the world. Mammoth Pacific 2 (MPII) and PLES-1 were both commissioned in 1990 and use the same air-cooled technology.

Main mechanical design and features:

■ Single Gimbal Type Metal Expansion Joint

· Size : 30”(DN 750) x 1000mmL 2 sets

· Design Press. : 36.7 kg/㎠G 

· Design Temp. : 125℃ / -18℃

■ Single Gimbal Type Metal Expansion Joint

· Size : 42”(DN 1050) x 1000mmL 4 sets

· Design Press. : 31.7 kg/㎠G 

· Design Temp. : 150℃ / -18℃

■ Dual Gimbal Type Metal Expansion Joint

· Size : 30”(DN 750) x 3500mmL 1 set

· Design Press. : 36.7 kg/㎠G 

· Design Temp. : 125℃ / -18℃

■ Dual Gimbal Type Metal Expansion Joint

· Size : 42”(DN 1050) x 3500mmL 2 sets

· Design Press. : 31.7 kg/㎠G 

· Design Temp. : 150℃ / -18℃

■ Tied Universal Type Metal Expansion Joint

· Size : 30”(DN 750) x 3000mmL 1 set

· Design Press. : 26 kg/㎠G 

· Design Temp. : 135℃ / -18℃

■ Tied Universal Type Metal Expansion Joint

· Size : 42”(DN 1050) x 3000mmL 2 set

· Design Press. : 31.7 kg/㎠G 

· Design Temp. : 150℃ / -18℃

■ Tied Universal Type Metal Expansion Joint (2-ply Testable Bellows)

· Size : 10”(DN 250) x 1700mmL 1 set

· Design Press. : 27.4 kg/㎠G 

· Design Temp. : 135℃ / -18℃

■ Design Code & Standard

· ASME B31.3 2018 Edition Process Piping

· EJMA (Expansion Joint Manufacturers Association) 10th Edition

· ASME BPVC Sec.Ⅴ 2019 Edition

· ASME BPVC Sec.Ⅷ Div.1 2019 Edition

· ASME BPVC Sec.Ⅸ 2019 Edition

■ Materials

· Bellows : ASME SB-168 ALLOY 600 

· Pipe : ASTM A516 Gr 70N

· Hardware : ASTM A105N for Gimbal Ring, ASTM A516 Gr 70 for Gimbal Arm, ASTM A240-304 for Cover etc.