01

Introduction of application requirements of FRP membrane shell

FRP membrane shell, also known as membrane pressure vessel, is a supporting product of reverse osmosis, sodium filtration, ultrafiltration and other devices. It is made of computer program-controlled winding unit and high-performance processing equipment. Today, I will introduce some requirements of FRP membrane shell in use.

The application requirements of FRP membrane shell are as follows:

1. Comply with the rated design pressure index, use within the allowable range, and do not operate under overpressure.

2. The normal working temperature of FRP membrane shell is generally in the range of - 7 ℃ - 49 ℃. It is strictly forbidden to work beyond this temperature range.

3. The pH range of FRP membrane shell is   3—10。

4. Back pressure shall not exceed   125PSI。

5. The conventional fluid medium is clear water, sewage and sea water. If it is used for special fluid, please contact water treatment professionals in advance to avoid accidents.

6. When the system is working or there is pressure in the membrane shell, it is strictly forbidden to knock, dismantle or move the membrane shell, and the influence of surrounding vibration sources is strictly controlled.

These are the maintenance requirements of FRP membrane shell. It may be necessary to remove the FRP pressure vessel from the system during maintenance or replacement. Please reserve enough space for maintenance and operation. Be careful when installing and removing the module housing to avoid damage to the housing, which will lead to the failure of the pressure vessel and may cause harm to people.

02

What are the characteristics of FRP membrane shell?

The characteristics of FRP membrane shell are as follows

1. Excellent and reliable internal quality

FRP membrane shell is made by computer program-controlled winding unit and high-performance processing equipment. The main materials are epoxy resin and fiber. After special process treatment, FRP membrane shell has incomparable advantages in pressure resistance, temperature resistance and corrosion resistance compared with ordinary steel, plastic and other materials.

2. Excellent insulation performance

The thermal conductivity of FRP membrane shell is generally in the range of 0.15-1.36w (m.k) at room temperature, which is only about 1 / 200. Its thermal insulation performance is unmatched by metal materials. This characteristic is good for the reverse osmosis membrane in the membrane shell, and the external temperature has little effect on the membrane.

3. Outstanding corrosion resistance

The combination ratio of glass fiber and epoxy resin is specially cured to form a natural corrosion-resistant product. The inner surface is smooth and the coating has good stability to low concentration of acid, alkali, salt, oil and other solvents. The seawater and microorganism entering the shell can be effectively inhibited, and there is no corrosion after long-term use.

4. Structural design

The barrel body, head and slot of the membrane shell are strictly designed and optimized to ensure the structural safety. The design of concentrated water side opening is optimized, which can meet the necessary safety pressure of opening four side openings at one head, and enhance the variability in the installation process.

5. Reliability of components

The end plate is an important part of the module housing assembly, which has high strength, high pressure and high pressure impact resistance. The sealing design is professional "V + X" ring with O-type end plate sealing ring to ensure that it does not leak in the range of low temperature and high temperature. The sealing design of the side opening is the combination of L-shaped bulging circular gasket, which ensures that the side opening nozzle can play a better sealing role in the case of angle deviation. The side opening is fastened by lifting type fastener, which makes it more adjustable.

The above is the introduction of the characteristics of FRP membrane shell. In addition, as the shell of the membrane element, the membrane shell can be used continuously for a long time. However, in order to ensure the long-term and efficient use of the membrane shell, please strictly follow the temperature range (- 7c-49c) that the product can withstand, and it is strictly forbidden to work beyond this temperature range.

03

Installation method of FRP membrane shell

Before any operation on the FRP membrane shell, read the product accessories pattern recognition. Incorrect assembly of FRP membrane shell or use of corroded membrane shell parts will seriously affect the sealing performance of membrane shell and leave hidden danger. How to install the FRP membrane shell?

|The installation steps of FRP membrane shell are as follows:

1. Carefully check the engineering drawings of the installed module housing, and clarify the key dimensions and technical requirements;

2. Design and manufacture the support according to the engineering drawings and system capacity. The support design should not only consider the support of membrane shell, but also ensure the support structure of piping and pipe network;

3. Check whether the membrane shell to be installed is intact, focusing on the inner surface of the membrane shell and the sealing surface of the original / concentrated nozzle;

4. Install the module housing on the saddle to ensure that there is enough space at both ends of the module housing to install and unload the module components, and align the original / concentrated nozzle at the end of the module housing;

Note: the stress concentration should be avoided during the installation of the module housing. When the original / concentrated water end is fixed, the membrane shell should be installed on the bracket in the middle.

5. Install the strap, pass the strap bolt through the mounting hole of the bracket, and screw the bolt into the strap nut with a wrench, with a torque of 3 ~ 5N. M   In this way, the strapping belt can firmly fix the membrane shell on the saddle, and at the same time, the membrane shell has enough expansion space;

Attention: please do not install the binding bolt too tightly to avoid damaging the shell; Make sure that there is enough expansion space for the module shell. Limiting the expansion of the module shell will damage the module shell; The strapping provided by kaineng Huayu is only used to protect and fix the membrane shell during operation, and can not bear all kinds of loads that may occur during transportation.

6. Connect the original / concentrated nozzle piping of membrane shell;

7. Assemble the end cover;

8. Loading membrane elements;

9. Install thrust ring at concentrated water end;

10. Close the module housing;

11. Connect the purified water outlet pipeline;

12. Inspection, including but not limited to the fixed position of the module housing, the sealing condition of the module housing and the connection condition of the pipeline;

13. Pressurize and start the system.

The above are the installation steps and precautions of FRP membrane shell, which is equipped with reverse osmosis membrane for advanced treatment of raw water, such as seawater desalination. The correct use of FRP membrane shell is helpful to improve water production efficiency and ensure the stability of effluent quality.

04

Notes on installation of FRP membrane shell

Incorrect assembly will seriously affect the performance of FRP membrane shell damage, more serious can lead to personal injury and end part burst and failure. Today, I will introduce some requirements for the installation of FRP membrane shell.

Precautions for installation of FRP membrane shell

1. Please pay attention to the protection of the seal when installing the two ends and the sealing plate. The lubricant should be applied in place, especially at the slope of the inner groove of the end retaining ring, to ensure the lubrication of the OK seal ring.

2. Check the tightening force of the pressure plate fastening nut.

3. Pay attention to all the accessories of the two ends, whether there are missing installation, whether there are sundries left in the membrane shell, so as to avoid damaging the membrane element and the membrane shell due to the high pressure drop.

4. Check whether the thrust ring is at the concentrated water end to prevent the membrane element from being damaged during backwashing.

5. Check the connector (bailing, clamp) to make sure it is in place.

6. After the completion of the installation inspection, start to slowly add water to the membrane module (in the membrane housing) to discharge the air in the membrane module and the membrane housing. After emptying, pressure relief, reciprocating several times, to prevent water hammer phenomenon, to ensure that the seal ring can stretch freely, reset.

7. The pressure in the fresh water pipe shall not exceed 125psi, and attention shall be paid to whether the water purification pipe is blocked by foreign matters.

8. The membrane shell can not be used as a load-bearing carrier, can not be used to load or apply pressure on the upper part, and can not apply pressure on its directly connected accessories.

The above are the precautions in the installation of FRP membrane shell. If you have any questions, please leave a message at the end of the article. Xiaobian will reply to you in time!