密排管的英文

• close pitched tube
• closed-pitched tube

• 密:    secret
• 密排管结构:    tangent tube construction
• 密排管炉膛:    tangent pitch tube furnace
• 密排管水冷壁:    tangent tube wall
• 排管:    calandria; exhaust system; rack pipe; racking pipe; rake; shock macaroni