230KV Four circuits transmission line tower 
Four-circuit transmission line has four circuits. For three-phase systems, each tower supports and insulates twelve conductors. Usually four circuits operate at the same voltage and at top of tower are OPGW.  Tension tower was located between every three or four suspension tower to pull the conductors which are re-tied in tension tower insulators. 
 
This photo refer to our 230KV four circuits tower forIndonesiaclient. Tower stubs are large size angle steel and bracing consisted of small size angle steel. MEGATRO is equipped with sophisticated machinery and equipment for the manufacture of 230KV four circuit transmission towers, we have skilled worker with certificated welders, and offers design for our clients. In material we often adopt mild steel (ASTM A36, Q235B, ST37, BS40B), high strength and lower alloy (ASTM A572 GR50, GR65, Q345B, Q345C, Q420, Q460, S355J0, S355JR , ST52, BS50 and equivalent materials). 

MEGATRO can optimized design and make transmission tower less weight, high strength, proper span distance, good wind resistance, and economy in the use of materials. Our main design engineer fromUSA, can use PLS/TOWER software to design every type steel tower based on structural calculations and geometrical frame drawings. To meet the expectation, we produce shop drawings, components list and full production documentation, and even complete 3D models that facilitate the elimination of all design and drawings errors generated on the drawings. Another advantage is our 3D design and loading & design report, and can optimized the design and save cost for our clients. 
After fabrication all 230KV four circuits transmission steel tower, are delivered to the galvanizing facility to be Hot DIP Galvanized. Towers are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free 

Other information: 
Availability size: Based on the customer's requirements. 
Material: Chinese material or as per clients requirement 
Package: Both parties discuss before delivery 
Port of Loading: Qingdao Port 
Lead Time: One month or based on the customer's needs 
Minimum order: 1 ton
Fabrication standard: Chinese Standard or other standard which client accepted 

Steel grades 
Tower legs: Chinese steel Q345B, which same to ASTM A572 GR50 
Other webs, bracing and not stress plate and angle steel: Chinese Q235B, which same to ASTM A36 
Plates: Chinese steel Q345B, which same to ASTM A572 GR50 
Bolts: Chinese grade 6.8 and 8.8, which similar to ASTM A394 
A) Dimension and tolerance for angle are according to GB/T1591-1994, similar to EN 10056-1/2 
B) Hot dip galvanization in accordance with GB/T 13912-2002, which similar to ASTM A 123 
C) The welding will be performance in accordance with AWS D1.1 or CWB standard 

If any special requirement, we can design and discuss with client.