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סҳ ڰɭ CSGO Ʒܻ Ӫͷ Դ ϵ
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Several problems should be paid attention to in application of fluorine plastic lined anticorrosive CSGO
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Several problems should be paid attention to in application of fluorine plastic lined anticorrosive CSGO
Reasonable selection and application of fluorine plastic lined anti-corrosion CSGO is a problem of concern in engineering. According to the user's experience in field application for many years, the following precautions are put forward for your reference.
Fluorine plastic lined anti-corrosion CSGO has been widely used in the equipment contacting with acid and alkali and other strong corrosive media in petroleum, chemical, pharmaceutical, metallurgy, electric power and other industries. However, according to our users' experience in field application for many years, the selection of fluorine plastic lined anti-corrosion CSGO should deal with the medium temperature, pressure, differential pressure, etc The following precautions are proposed:
1. Medium temperature used for fluorine plastic lined CSGOs: F46 (FEP) is used for all kinds of fluorine plastic lined CSGOs of our company, and the medium temperature used shall not exceed 150 (the medium temperature can reach 150 for a short time, and the service temperature for a long time shall be controlled within 120 ). Otherwise, the F46 lining of various parts of the CSGO is easy to soften and deform, resulting in the CSGO unable to close and the leakage is large ?
If the medium temperature is below 180 for a short time and 150 for a long time, another fluoroplastic PFA can be selected. However, the price of PFA lined fluoroplastics is higher than that of F46 lining. ?
2. Do not have negative pressure. The negative pressure in the pipeline should be avoided for the fluorine plastic lined CSGO. If there is negative pressure, the fluorine plastic lining layer in the CSGO cavity will be sucked out (bulged out) and shelled, resulting in the CSGO opening and closing failure.
3. The pressure and differential pressure should be controlled within the allowable range. In particular, the bellows sealed fluorine plastic lining control CSGO, stop CSGO. Because the bellows is made of PTFE material, the pressure and pressure difference are large, which can easily lead to the rupture of bellows. The fluorine plastic lined regulating CSGO with bellows seal can be changed into PTFE packing seal if the service condition pressure and differential pressure are large. ?
4. The medium conditions used for fluorine plastic lined CSGO should not have hard particles, crystals, impurities, etc., so as to avoid abrasion of fluorine plastic lining layer or PTFE bellows of CSGO core and CSGO seat during the operation of opening and closing. For the medium with hard particles, crystals and impurities, the CSGO core and CSGO seat can be replaced with Hastelloy.
5. The CSGO diameter should be selected correctly according to the required flow (CV value). In the selection, the CSGO diameter and CSGO opening degree should be calculated according to the required flow (CV value) and other technical parameters. If the CSGO diameter is too large, it is bound to make the CSGO operate under the condition of small opening degree for a long time, plus the pressure of the medium, so that the CSGO core and rod are easily impacted by the medium, causing the CSGO to vibrate, and the CSGO core rod will be in the medium for a long time Under the impact of, even make the CSGO stem fracture. ?
When choosing various fluorine plastic lined CSGOs, users should try their best to understand and master the technical conditions, so as to select and use them well and improve the service life of the CSGOs. In case of joint use of the technology, the company shall propose corresponding countermeasures.
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