Foreign referred to as polyethylene PE, low density polyethylene maximum application temperature is 60 ℃, high density polyethylene 70 ℃. Minimum application temperature of -72 ℃. With no welding seams, no leakage, non-toxic, anti-aging, impact resistance, corrosion resistance, long life, meet the health standards and so on. Material into the tank by SMC fiberglass tank, Rambo stainless steel tanks, stainless steel liner fiberglass tanks, fiberglass water tank, enamel tank five kinds. Tanks are generally equipped with HYFI remote level electric valve, HYJK type water level monitoring system and HYQX-II tank automatic cleaning system and HYZZ-2-A-type tank self-cleaning disinfection, water tank overflow pipe and tank drain valve Connect and set up insect nets, water level should be two different snorkel (located Insect), water tank located inside and outside the ladder; tanks generally have inlet, outlet pipe (live outlet, fire outlet pipe), overflow pipe, drainage pipes, tanks according to different functions into living water tanks, fire water tank, production tanks, air defense tanks, water towers five kinds of household strict sense toilet flush tank and tank car tank does not belong to category. Technical requirements 1, the tank shall comply with the requirements of the standard, in accordance with regulations of the manufacturing drawings and dimensions. 2, the water tank after welding without loosening the fasteners, welding the connections may not tainted, not missing pieces of the phenomenon. 3, the tank welds to full, the tank outer weld surface should be smooth, beautiful, no slag, no overlaps, no holes, no cracks, welds can not have concave crack, separation, not a cut hand phenomenon. Water tank welds must be polished. Should also be required to achieve the following table 2 welding requirements. 4, the flat bottom tanks should be kept flat, deformation degree to meet requirements of Table 3. 5, the top of the tank and the manhole must be fully welded, quality requirements the same as 4.3. 6, the tank must be connected to the mouth good welding, while preserving the vertical inclination of at least no more than 1 °. 7, the insulation layer and the outer tank with a solid, smooth appearance. Insulation layer of polyurethane foam plastic or better insulation materials; outdoor decorative shell with stainless steel or other suitable material, the surface shall not be uneven, with scratch marks or rust, meet requirements of Table 2. 8, for the dimensions tolerances shall meet the following requirements in Table 3. 9, the water tank filled with water, without infiltration, water leakage, there should be no significant deformation phenomena, in accordance with welded steel pressure vessel filled with water experiments related terms. (GB50242-2002 Construction Plumbing and Heating Engineering Quality Acceptance) 10, the tank should be kept upright vertical, vertical shall meet the requirements of Table 3. 11, the actual installation of water tanks shall be not less than the nominal capacity. 12, stainless steel plates used in the tank shall meet the requirements of GB/T3280. The tank must be used in plate 304 stainless steel plate. Outside thickness tolerance of less than 10%. 13, used in carbon steel tanks shall conform to GB / T 700 requirements. All tanks must be done embalmed iron components, needed rust rust treatment done twice, the exposed part of the need to brush twice silver paint. 14, protruding parts inside and outside the tank into the hole flanging process should be done or do other protective treatment, to avoid cuts people. 15, after the clean water tank is filled with water in accordance with requirements GB5749, stand 1h, at the outlet of the water tank should meet the requirements of GB5751. Plastic water tanks including plastic water tanks, plastic containers, plastic drums, plastic square boxes and other large plastic containers, plastic water tanks are mainly raw materials with a new dedicated high concentration rotomolding polyethylene (HDPE) made of HDPE materials generally have environmental protection, acid and alkali resistance, high temperature properties. HDPE made of food grade plastic tanks can be achieved.