مقدمه ای بر لوله فولادی خط لوله API 5L / تفاوت بین استانداردهای API 5L
API 5L generally refers to the implementation standard of line pipes, which are pipelines used to transport oil, steam, water, etc. extracted from the ground to oil and natural gas industrial enterprises. Line pipes include seamless steel pipes and welded steel pipes. At present, the commonly use...