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4, high pressure oil pipe replaced on a regular basis every two years. Found to be cracked, damaged during use, expansion of the shoulders and other phenomena should be replaced in a timely manner.

4th, the high-pressure oil pipe regularly replaces every two years.The discovery has phenomena and so on chap, damage, shoulder inflation when the use process, should replace promptly.

4 every two years, high-pressure pipeline changed on a regular basis. During the course of their use, damage, cracks are found his shoulder phenomenon such as swelling, should be replaced in a timely fashion.

4, high pressure oil pipe replaced on a regular basis every two years. Found to be cracked, damaged during use, expansion of the shoulders and other phenomena should be replaced in a timely manner.