Construction cobblestone standard transformer provisions of ministerial standards, Zhijiang pebbles, the lower part of the large oil-immersed transformers shall be provided with an oil reservoir, an area slightly larger than the share of transformer plane, about the depth of 1M, laying cobblestones around diameter 8-10CM The main purpose is to absorb transformer oil spills. Related Standards: DL5027-1993 electrical equipment specified in 7.3.4 Typical firefighting procedures for 50-80mm. "3-110KV high voltage electrical installations" (GB 50060-92) Section 5.4.5 of oil storage tanks should lay cobblestone layer thickness not less than 250mm, and its cobblestone diameter is preferably 50-80mm. Pebble is formed? About the Mesozoic in 100 million years ago, Cobblestone prices, the role of crustal movement, magma emerge surface, pebbles, lava cooled quickly will form granite. Thereafter dating back thousands of years, since the granite magma intrusion caused dislocation squeeze, ordinary pebbles, resulting in a large number of smaller stones, those stones at the water's edge, after a long period of slow erosion and water Scroll own mutual, final form today pebbles. Pebble is a very long time, evolving. Water pebbles, pebbles Zhijiang, water filter (see) provided by the Henan water purification Material Co., Ltd. Spirit. "Polyacrylamide, PFS, activated carbon, fiber ball, water treatment material" preferred Henan Spirit Water Material Co. (www.gyssjs.com), the company is located: Gongyi City, Henan Province, North Industrial Park Yamaguchi, over the years, flourishing water to provide customers with the best quality service, Contact: Zhang. Welcome to the new and old customers call, letter, visit the guide, business negotiations. Saatchi & purification expect to be your long-term partner!