... drawings.Its products are widely used in domestic and foreign petroleum chemical industry,petoleum industry,chemical,industry,textile,paper ... Hebei Longrun Pipeline Group Co., Ltd. is located in Longtan Industrial Park of Yanshan County, known as the City of Pipeline, and at ... , and our metal hoses and corrugated compensators are made of different materials. Certificate : ISO9001:2000 ,API,CEwelcome to ...