The key ideas of revamping scheme of safety in LPG spherical tank were introduced in the fields of modification of the measure system, interlock between warning of liquid level and remote control valve, pouring water pipetine of emergency, cutting water system, the minimum of the nozzle at the bottom etc.
When the corrosion inhibitor YF-971 (assisted with ammonia injection) has been injected from March 2002 with a dosage of 80 ppm, the total average iron in blow-down water is 1.6 mg/L and the bottom corrosion of the distillation tower has been effectively controlled.
Different inner structures of domestic crude electric desalter have been analyzed and compared according to the functional mechanism of electric field in the water drop electro coalescence process. High speed electric desalting features such characteristics as high speed and efficiency desaltings lower oil content in the drainage and the low electricity consumption. Crude capacity can be increased greatly compared under the same conditions.
The countermeasures are that the feeding compound concentration of the hydrogenation reaction is controlled under the reaction temperature and below 85% TA saturation concentration,the changing water valve is examined regularly,chaning water washing is done in time,the pressure control valve of the reactor is high limit(the maximum open degree is 45%),returning material quality are paid attention to,alkali washing and water washing on catalyst system are carried out.
Two experiments were conducted to determine theeffect of handling, short-term storage, andinitial water stress on cutting water potential (ΨW) and rooting of loblolly pine(Pinus taeda L.) stem cuttings.
One also has to wonder if the hulls of ships could be coated with this material, cutting water resistance and improving fuel efficiency.
The residents have learned to live with noise and dust, but the builders caused some extra disruption cutting water-pipes and electric wires.
The paper introduces the design of a automatic water - drainig system for oil storage tanks. It also presents in detail the principal electric circuits of the system. This system is specifically designed for automatic water-draining in oil storage tanks for the petrochemical industry.
A recent deve loped safety valve for water draining from such tanks is introduced. The paper also gives a brief account of the basic construction. its working principle and data bases upon which the valve design is derived.
Oil-water boundary meter with a 137Cs source is used for measure of oil -water boundary and auto-cut of water in the storage tank. The loss of oil and correlative explosion accidents caused by manul cutting of water can be avoided using this meter.