Langfang Zhongyide Petroleum & Gas Equipment Co., Ltd.(Hereinafter say ZHYD) is a leading company in the industry in the pipeline accessories. Our products such as the HeShan geo-textile fabric negative buoyancy bag weight is a patented system of top-loading, gravel filled compartments that straddle a pipeline to achieve buoyancy control; the patented series insulators are patented products that are universally applicable in the installation of pipelines when the carrier pipe runs inside a casing; and the Cathodic Protection Test Piles are patented that are used for the Cathodic protection for the buried steel-pipeline of natural gas, LPG, oil, product-oil, coal gas, chemical plant, Hydraulic Engineering and Water supply engineering. ZHYD also provides pigs that can be used for all kinds of oil, gas, water and new pipelines to remove the deposites and contaminants from the pipe.