Materials of bolts (studs) and nuts used for nozzle flange shall be selected according to CIBA 3rd Line Project Piping Materials Classification (CSTL-T1300/H103).

• 设备口法兰用单头螺栓（双头螺栓）及螺母的材料根据CIBA第3条线工程管道材料等级表（CSTL-T1300/H103)选择。