1、 Characteristics of FYX nitric acid submersible pump

There are three types of nitric acid submersible pumps,

One is made of high-purity aluminum, suitable for nitric acid with a concentration of over 65% and a temperature not exceeding 60 degrees Celsius,

Another type is a nitric acid submersible pump produced using C4 special high silicon stainless steel, suitable for full concentration nitric acid, with temperatures ranging from room temperature to boiling point,

Another type is made of 304L, which is suitable for nitric acid with a concentration below 68% and a temperature ranging from room temperature to boiling point,

The corrosion-resistant pump materials for nitric acid include: 1. high-purity aluminum 2. high silicon iron 3. tetrafluoroethylene 4. C4 special high silicon stainless steel 5. 304L

The boiling point of nitric acid varies at different concentrations, so users must provide the concentration and operating temperature of nitric acid when selecting.

2、 Material selection for pumps under different nitric acid liquids

1. High purity aluminum

Among these materials, high-purity aluminum has excellent resistance to concentrated nitric acid corrosion at room temperature. The disadvantage is that when the concentrated nitric acid temperature exceeds 60 ℃, high-purity aluminum is obviously not resistant to concentrated nitric acid corrosion. Therefore, high-purity aluminum submersible pumps can only transport nitric acid with a working temperature below 60 ℃.

2. High silicon iron

High silicon iron has good resistance to concentrated nitric acid corrosion in various temperature environments, but its fragile nature and poor mechanical properties limit its use in concentrated nitric acid transportation.

3. Tetrafluoroethylene

Tetrafluoroethylene is also resistant to nitric acid corrosion at temperatures below 120 ° C, and due to its own characteristics such as relatively soft mechanical properties and susceptibility to aging. These also limit the use of PTFE pumps in nitric acid equipment. At present, it is mainly used for mechanical seals and gaskets. Use other materials to make the pump

4. Special high silicon stainless steel has excellent comprehensive resistance to concentrated nitric acid corrosion among these materials. Its corrosion resistance is superior to high-purity aluminum and similar to high silicon iron. Its mechanical strength and machinability are incomparable to high-purity aluminum and high silicon iron. This material is relatively expensive and requires a high initial investment, but it has good corrosion resistance and a long service life. It has good mechanical performance, high safety factor during use, easy maintenance, etc. It can achieve less or no parking during production, improving the production efficiency of the entire production line.

5.304L

In the impression of most users, 316 is always more corrosion-resistant than 304. However, this statement is not objective. In nitric acid, 304L has higher corrosion resistance than 316L because the presence of Mo reduces the corrosion resistance of stainless steel in nitric acid. In boiling 65% nitric acid, the corrosion rate of 304L is 0.15mm/year, while 316L exceeds 0.3mm/year,

304L is suitable for nitric acid with concentrations below 68% and temperatures ranging from room temperature to boiling point.

3、 Cost effective selection of nitric acid submersible pumps made of different materials

1. High cost-effective pump: FYX high-purity aluminum concentrated nitric acid underwater dedicated pump

In the environment of concentrated nitric acid transportation, most users choose our FYC high-purity aluminum concentrated nitric acid submersible pump because of its low price and service life of generally 1-2 years. Our company's timely after-sales service is the first choice for most users.

2. Value preserving pump: FYX-X special high silicon stainless steel submersible nitric acid pump

We have already introduced the mechanical properties of special high silicon stainless steel above. It has a long service life, excellent resistance to nitric acid corrosion, temperature resistance up to 100 degrees, and can be used with any concentration of nitric acid.

The only drawback of this pump is its very high price.

So far, few customers have chosen special high silicon stainless steel material. If needed, customers need to place an order in advance.

3. Low priced nitric acid submersible pump: FYX-L 304L nitric acid submersible pump

The 304L nitric acid submersible pump is suitable for nitric acid with a concentration not exceeding 68%, which complements the FYX high-purity aluminum concentrated nitric acid submersible pump perfectly, and the price of the 304L nitric acid submersible pump is the lowest among the three.

4、 Performance parameter table of FYX nitric acid submersible pump