Chemical pump seal cooling water piping design scheme selection

by:J&T     2020-06-21
Chemical corrosion is commonly used in the production of industrial pumps, pump transmission medium is different, have different chemical pump form, whether you need pump cooling water, which parts need to cooling, cooling water consumption of how many, the medium and temperature, the pump type and so on, usually in the high temperature medium, solid content, such as more medium pump seal form is different, such as double seal, container seal, etc. , the following are the general design thoughts and basic methods, specific application should be to the actual working condition of the pump parameters and determine the water pump factory experience. A cooling water, cooling water piping system design conditions of the API standard requires the design of piping system should meet the following requirements: velocity on the surface of the heat exchanger: 1. 5 ~ 2. 5 m/s allows working pressure: 0. 7MPa( G) Test pressure: 1. 05MPa( G) Pressure drop: 0. 1 mpa, high water temperature 30 ℃ high temperature: 50 ℃ temperature: 20 ℃ fouling factor: 0. 35平方米。 Corrosion allowance (K/kW shell Except for heat exchange tube) : 3. 0 mm to provide cooling water piping system should also comply with specific process conditions of cooling water process of the project, a cooling water of petrochemical plant utilities in our country conditions are as follows, For reference) : allow working pressure: 0. 7MPa( G) Supply pressure: 0. 4 to 0. 6MPa( G) Pressure drop: 0. 2 mpa water pressure: 0. 2 to 0. 4MPa( G) High water temperature: 33 ℃ high temperature: 43 ℃ temperature: 10 ℃; Fouling factor: 0. 5 m2 low chlorine ion K/kW: 200 g/m3, cooling water piping system arrangement unless otherwise specified, cooling water piping system and every one of main pipe shall be set up necessary inlet valve and outlet valve, and each cooling water outlet pipe flow should be set up on the lens. Cooling water piping arrangement shall comply with the provisions of the table, the seller should clear when technology offer cooling water piping system. Three, water pump cooling water piping scheme 1, medium temperature higher than 120 ℃, the suitable for sealing liquid ( Or buffer) For cooling, Metal bellows seal except) To lower the temperature of the seal chamber, improve the sealing conditions, prolong its service life. Cooling water piping system used in the table plan K and M. 2, conveying crystallizable liquid, consideration should be given to mechanical seal set for liquid ( Such as water, steam, etc. ) For cooling, 淬火) Sealed cavity, and the solid in atmospheric side accumulation; High conveying saturated steam of the liquid ( Such as liquefied petroleum gas, liquid ammonia, etc. ) , consideration should be given to a mechanical seal set for fluid ( Such as 40 ℃ hot water, steam, etc. ) Heating ( 淬火) , in order to prevent the liquid gas or liquid ammonia pressure drop due to vaporization and ice, and prevent the auxiliary seal harden crisp, lose the sealing function. D in the table was used in cooling water piping system. 3, medium temperature higher than 300 ℃, not only need cooling pump head part, suspension bearing room should be equipped with cooling system, water pump structure as the center supporting form, general use a metal bellows mechanical seal type, but the price is high ( The price is PuTongJi seal more than 10 times) 。 4, medium temperature below 120 ℃, usually do not set up a special cooling system, use itself more medium for lubrication and cooling, for easy crystallization or medium containing particles should be equipped with seal face flushing pipeline ( When the design with interface) 。 5, medium temperature higher than 120 ℃, should consider whether you need the bearing box for cooling, cooling water piping system used in the table plan A and K.
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