... convection tubing, pigtails, outlet manifolds, and quenching-system piping; in ethylene production for both convection and cracking tubes, and ... , convection tubing, pigtails, outlet manifolds, and quenching-system piping.Ethylene, Oxy Alcohol, Vynil Chloride monomer production - heater tubing ... (General) Welcome to contact us,Zhejiang Chaowei New Material Co., Ltd.(High Nickel Alloy and Super Alloy Materials ...