We buy before the sewage pump is the most thought about how to selection, selection of the first step will be based on transmission medium selection, different media requirements of different materials, sewage pump, like a doctor, must be the right remedy.
Sewage pump selection
Sewage pumps use a wide range of different working conditions, sewage pumps need to be treated differently according to the specific situation. First of all depends on what systems engineering, according to different media in the project will be able to separate out the type and material sewage pump. Then in a single project, look at the design requirements, according to the pipeline medium, flow, head, power and then subdivided the pump.
1, sulfuric acid medium sewage pump material selection
As one of the strong corrosive medium, sulfuric acid is a very important industrial raw material. Different concentrations of sulfuric acid and temperature corrosion of the material difference is greater for the concentration of 80% or more, the temperature is less than 80 ℃ concentrated sulfuric acid, carbon steel and cast iron material sewage pump has good corrosion resistance, but it is not suitable for high-speed Flow of sulfuric acid, does not apply to the material for the valve; ordinary stainless steel such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) sulfuric acid medium is also limited use. Therefore, the transport of sulfuric acid sewage pump valve is usually made of high silicon cast iron, high alloy stainless steel. Fluorine plastic has good resistance to sulfuric acid performance, the use of lined pump is a more economical choice.
2, hydrochloric acid medium under the sewage pump material choice
Most metal materials are resistant to hydrochloric acid corrosion (including a variety of stainless steel materials), molybdenum-containing high-ferrosilicon can also be used only 50 ℃, 30% of hydrochloric acid. In contrast to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so the rubber-lined sewage pump or plastic sewage pump (such as polypropylene, fluorine plastic, etc.) is the best choice to transport hydrochloric acid.
3, nitric acid media under the sewage pump material choice
Most of the metal in nitric acid is rapidly destroyed by corrosion, stainless steel is the most widely used nitric acid resistant material, the concentration of nitric acid at all temperatures have good corrosion resistance, so the medium is nitric acid, stainless steel should be selected as the sewage pump material . It is worth mentioning that, containing molybdenum stainless steel (such as 316,316 L) of nitric acid corrosion resistance is not only not better than ordinary stainless steel (such as 304,321), sometimes even worse. For high-temperature nitric acid, sewage pumps are usually titanium and titanium alloy as a material.
4, acetic acid media under the sewage pump material selection
Acetic acid is one of the most corrosive substances in organic acids, ordinary steel in all concentrations and temperatures of acetic acid will be serious corrosion, stainless steel is an excellent material resistant to acetic acid, 316 stainless steel containing molybdenum can also be applied to high temperature and dilute acetic acid vapor . Therefore, for high-temperature high-concentration acetic acid or other corrosive media containing other demanding requirements, the choice of high-alloy stainless steel sewage pump or fluorine plastic sewage pump.
5, alkaline medium sewage pump material selection (sodium hydroxide)
Iron and steel are widely used in 80 ℃ below, 30% concentration of sodium hydroxide solution, there are many factories at 100 ℃, 75%, sewage pump material is still using ordinary steel, although increased corrosion, but the economy is good. Ordinary stainless steel corrosion resistance of alkali and no obvious advantages compared to cast iron, as long as the medium to allow a small amount of iron incorporation, is not recommended for stainless steel. For high temperature lye, the sewage pump material and more use of titanium and titanium alloy or high alloy stainless steel.
6, ammonia media, the choice of sewage pump material (ammonia hydroxide)
Most metals and non-metals in the liquid ammonia and ammonia (ammonia) in the corrosion are very minor, so the sewage pump in this medium only copper and copper alloy should not be used.
7, salt water under the sewage pump material selection (sea water)
Ordinary steel sewage pump made in the sodium chloride solution and seawater, salt water corrosion rate is not too high, the general sewage pump to be used to protect paint; various types of stainless steel also has a very low uniform corrosion rate, but may be caused by chloride ions Localized corrosion, so the sewage pump is usually used in the brine 316 stainless steel is better.
8, alcohols, ketones, esters, ethers
Ethyl alcohol, acetone, methyl ethyl ketone, etc., ester media have a variety of methyl ester, ethyl ether, ethers are ether, ether, alcohol, Butyl ether, etc., they are basically no corrosive, sewage pump material selection of common materials can be applied, the specific selection should be based on the properties of the media and related requirements to make a reasonable choice. It is also noteworthy that ketones, esters, ether soluble in a variety of rubber, in the choice of sewage pump sealing material to avoid mistakes.
The above 8 medium has some corrosive or volatile, which require different materials and models of sewage pump products, remember to choose according to these media, they are highly corrosive or flammable, so the selection must be cautious .
Sewage pump selection
Sewage pumps use a wide range of different working conditions, sewage pumps need to be treated differently according to the specific situation. First of all depends on what systems engineering, according to different media in the project will be able to separate out the type and material sewage pump. Then in a single project, look at the design requirements, according to the pipeline medium, flow, head, power and then subdivided the pump.
1, sulfuric acid medium sewage pump material selection
As one of the strong corrosive medium, sulfuric acid is a very important industrial raw material. Different concentrations of sulfuric acid and temperature corrosion of the material difference is greater for the concentration of 80% or more, the temperature is less than 80 ℃ concentrated sulfuric acid, carbon steel and cast iron material sewage pump has good corrosion resistance, but it is not suitable for high-speed Flow of sulfuric acid, does not apply to the material for the valve; ordinary stainless steel such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) sulfuric acid medium is also limited use. Therefore, the transport of sulfuric acid sewage pump valve is usually made of high silicon cast iron, high alloy stainless steel. Fluorine plastic has good resistance to sulfuric acid performance, the use of lined pump is a more economical choice.
2, hydrochloric acid medium under the sewage pump material choice
Most metal materials are resistant to hydrochloric acid corrosion (including a variety of stainless steel materials), molybdenum-containing high-ferrosilicon can also be used only 50 ℃, 30% of hydrochloric acid. In contrast to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so the rubber-lined sewage pump or plastic sewage pump (such as polypropylene, fluorine plastic, etc.) is the best choice to transport hydrochloric acid.
3, nitric acid media under the sewage pump material choice
Most of the metal in nitric acid is rapidly destroyed by corrosion, stainless steel is the most widely used nitric acid resistant material, the concentration of nitric acid at all temperatures have good corrosion resistance, so the medium is nitric acid, stainless steel should be selected as the sewage pump material . It is worth mentioning that, containing molybdenum stainless steel (such as 316,316 L) of nitric acid corrosion resistance is not only not better than ordinary stainless steel (such as 304,321), sometimes even worse. For high-temperature nitric acid, sewage pumps are usually titanium and titanium alloy as a material.
4, acetic acid media under the sewage pump material selection
Acetic acid is one of the most corrosive substances in organic acids, ordinary steel in all concentrations and temperatures of acetic acid will be serious corrosion, stainless steel is an excellent material resistant to acetic acid, 316 stainless steel containing molybdenum can also be applied to high temperature and dilute acetic acid vapor . Therefore, for high-temperature high-concentration acetic acid or other corrosive media containing other demanding requirements, the choice of high-alloy stainless steel sewage pump or fluorine plastic sewage pump.
5, alkaline medium sewage pump material selection (sodium hydroxide)
Iron and steel are widely used in 80 ℃ below, 30% concentration of sodium hydroxide solution, there are many factories at 100 ℃, 75%, sewage pump material is still using ordinary steel, although increased corrosion, but the economy is good. Ordinary stainless steel corrosion resistance of alkali and no obvious advantages compared to cast iron, as long as the medium to allow a small amount of iron incorporation, is not recommended for stainless steel. For high temperature lye, the sewage pump material and more use of titanium and titanium alloy or high alloy stainless steel.
6, ammonia media, the choice of sewage pump material (ammonia hydroxide)
Most metals and non-metals in the liquid ammonia and ammonia (ammonia) in the corrosion are very minor, so the sewage pump in this medium only copper and copper alloy should not be used.
7, salt water under the sewage pump material selection (sea water)
Ordinary steel sewage pump made in the sodium chloride solution and seawater, salt water corrosion rate is not too high, the general sewage pump to be used to protect paint; various types of stainless steel also has a very low uniform corrosion rate, but may be caused by chloride ions Localized corrosion, so the sewage pump is usually used in the brine 316 stainless steel is better.
8, alcohols, ketones, esters, ethers
Ethyl alcohol, acetone, methyl ethyl ketone, etc., ester media have a variety of methyl ester, ethyl ether, ethers are ether, ether, alcohol, Butyl ether, etc., they are basically no corrosive, sewage pump material selection of common materials can be applied, the specific selection should be based on the properties of the media and related requirements to make a reasonable choice. It is also noteworthy that ketones, esters, ether soluble in a variety of rubber, in the choice of sewage pump sealing material to avoid mistakes.
The above 8 medium has some corrosive or volatile, which require different materials and models of sewage pump products, remember to choose according to these media, they are highly corrosive or flammable, so the selection must be cautious .
Manufacturers recommend: Shenlong stainless steel sewage pump
Keywords:Different media, sewage pumps, selection
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