نمایش نتیجه 1 تا 2 از 2 نتیجه یافت شده برای preheating:
n: in pipeline construction, the process of heating pipe ends before welding. Preheating is usually necessary in areas where ambient temperatures are below 40�F (4 �C) or where there is overnight condensation of moisture on the pipe. Wagon- wheel heaters are used for preheating.
n: in pipeline construction, a multiheaded circular propane torch that is manually rotated inside the end of a pipe for preheating.
© ۱۳۹۲-۱۳۹۷ این اثر شامل قانون حمایت از مولفین بوده و هرگونه کپی برداری از آن ممنوع است.
