김정훈
2008-09-30 16:53:53
4
536
약 30m3 의 Air 용 압력용기입니다.
사용기간이 약 5년 정도 되었구요,
Tank 전단에 Cooler 를 설치하여 응축수 배출을
유도하였으나 Tank 및 후단 Filter, Dryer 등에서
응축수가 배출되는것으로 보아 수분이 다량 포함되었던 것으로
예상됩니다.(해수는 아님)
Tank 의 재질은 A516-70 이였으며, 사용 온도는 대략 60도
전후였습니다.
아직 제품을 받기 전인데 내부 도색을 새로 하고자 하더라구요.
기존에 내부 사비칠이 되어 있으며, 부식 상황을 고려하여
Shotblast나 산처리 또는 그라인딩 작업을 하려고 했으나
경험부족으로 쉽게 결정내리기가 쉽지 않네요.
(경제적인 부분 때문에~)
Tank 내부 부식 상태를 쉽게 제거할 방법이 없을까요?
선배님들 답변 부탁드립니다.
사용기간이 약 5년 정도 되었구요,
Tank 전단에 Cooler 를 설치하여 응축수 배출을
유도하였으나 Tank 및 후단 Filter, Dryer 등에서
응축수가 배출되는것으로 보아 수분이 다량 포함되었던 것으로
예상됩니다.(해수는 아님)
Tank 의 재질은 A516-70 이였으며, 사용 온도는 대략 60도
전후였습니다.
아직 제품을 받기 전인데 내부 도색을 새로 하고자 하더라구요.
기존에 내부 사비칠이 되어 있으며, 부식 상황을 고려하여
Shotblast나 산처리 또는 그라인딩 작업을 하려고 했으나
경험부족으로 쉽게 결정내리기가 쉽지 않네요.
(경제적인 부분 때문에~)
Tank 내부 부식 상태를 쉽게 제거할 방법이 없을까요?
선배님들 답변 부탁드립니다.
First of all, you may have to inspect the internal corrosion condition. According to the severity, you can select one of followings. The sand blasting is not specified because it is not easy for the installed/operating facility.
[Rust Removal in Mild Corrosion]
SSPC-SP1 : Solvent Cleaning
Solvent cleaning is a method for removing all visible oil, grease, soil, drawing and cutting compounds, and other soluble contaminants. Solvent cleaning does not remove rust or mill scale. It is intended that solvent cleaning be used prior to the application of paint and in conjunction with surface preparation methods specified for the removal of rust, mill scale or paint. Change rags and cleaning solution frequently, so that deposits of oil and grease are not spread over additional areas in the cleaning process. Be sure to allow adequate ventilation.
SSPC-SP2/NACE ST2 : Hand Tool Cleaning
A method of preparing steel surfaces by the use of non-power hand tools. Hand tool cleaning removes all loose mill scale, loose rust, non-adhered paint and other detrimental foreign matter by way of hand chipping, scraping, sanding, wire brushing, etc. It is not intended that adherent mill scale, rust, and paint be removed by this process. Mill scale, rust and paint are considered adherent if they can no be removed by lifting with a dull putty knife. Before hand tool cleaning, remove visible oil, grease, soluble welding residues, and salts by the methods outlined in SSPC SP 1.
SSPC-SP3/NACE ST3 : Power Tool Cleaning
A method of preparing steel surfaces by the use of power assisted hand tools. Power Tool Cleaning removes all loose mill scale, loose rust, and other detrimental foreign matter by way of power tool chipping, descaling, sanding, wire brushing, grinding, etc. It is not intended that adherent mill scale, rust, and paint be removed by this process. Mill scale, rust and paint are considered adherent if they can no be removed by lifting with a dull putty knife. Before power tool cleaning, remove visible oil, grease, soluble welding residues, and salts by the methods outlined in SSPC-SP 1.
SSPC SP-7/NACE No.4/SA-1 : Brush-Off Cleaning
A brush off-cleaned surface, when viewed without magnification, shall be free of all visible oil,grease, dirt, dust, loose mil scale, loose rust and loose coating. Tightly adherent mil scale, rust,and coating may remain on the surface. Mill scale, rust, and coating are considered tightly adherent if they cannot be removed with a dull putty knife. The entire surface shall be subjected
to the abrasive blast. The remaining mill scale, rust or coating shall be tight.
SSPC SP-12/NACE No.5 : Water Jetting
This standard provides requirements for the use of high and ultra high-pressure water jetting to achieve various degrees of surface cleanliness. This standard is limited in scope to the use of water only without the addition of solid particles in the stream.
[Rust Removal in Severe Corrosion- localized corrosion or severe metal loss]
- Grind-Out (and Build-Up Welding) or
- Sandblast
[Action After Removed The Rust]
An appropriate coating (i.e., epoxy) is recommended.
[Tanks Design]
- Drain nozzle to be installed according to the severity of corrosion.
[Rust Removal in Mild Corrosion]
SSPC-SP1 : Solvent Cleaning
Solvent cleaning is a method for removing all visible oil, grease, soil, drawing and cutting compounds, and other soluble contaminants. Solvent cleaning does not remove rust or mill scale. It is intended that solvent cleaning be used prior to the application of paint and in conjunction with surface preparation methods specified for the removal of rust, mill scale or paint. Change rags and cleaning solution frequently, so that deposits of oil and grease are not spread over additional areas in the cleaning process. Be sure to allow adequate ventilation.
SSPC-SP2/NACE ST2 : Hand Tool Cleaning
A method of preparing steel surfaces by the use of non-power hand tools. Hand tool cleaning removes all loose mill scale, loose rust, non-adhered paint and other detrimental foreign matter by way of hand chipping, scraping, sanding, wire brushing, etc. It is not intended that adherent mill scale, rust, and paint be removed by this process. Mill scale, rust and paint are considered adherent if they can no be removed by lifting with a dull putty knife. Before hand tool cleaning, remove visible oil, grease, soluble welding residues, and salts by the methods outlined in SSPC SP 1.
SSPC-SP3/NACE ST3 : Power Tool Cleaning
A method of preparing steel surfaces by the use of power assisted hand tools. Power Tool Cleaning removes all loose mill scale, loose rust, and other detrimental foreign matter by way of power tool chipping, descaling, sanding, wire brushing, grinding, etc. It is not intended that adherent mill scale, rust, and paint be removed by this process. Mill scale, rust and paint are considered adherent if they can no be removed by lifting with a dull putty knife. Before power tool cleaning, remove visible oil, grease, soluble welding residues, and salts by the methods outlined in SSPC-SP 1.
SSPC SP-7/NACE No.4/SA-1 : Brush-Off Cleaning
A brush off-cleaned surface, when viewed without magnification, shall be free of all visible oil,grease, dirt, dust, loose mil scale, loose rust and loose coating. Tightly adherent mil scale, rust,and coating may remain on the surface. Mill scale, rust, and coating are considered tightly adherent if they cannot be removed with a dull putty knife. The entire surface shall be subjected
to the abrasive blast. The remaining mill scale, rust or coating shall be tight.
SSPC SP-12/NACE No.5 : Water Jetting
This standard provides requirements for the use of high and ultra high-pressure water jetting to achieve various degrees of surface cleanliness. This standard is limited in scope to the use of water only without the addition of solid particles in the stream.
[Rust Removal in Severe Corrosion- localized corrosion or severe metal loss]
- Grind-Out (and Build-Up Welding) or
- Sandblast
[Action After Removed The Rust]
An appropriate coating (i.e., epoxy) is recommended.
[Tanks Design]
- Drain nozzle to be installed according to the severity of corrosion.
녹을 제거하지 않고 녹위에 칠할 수 있는 방청코팅제가 있습니다.
또한 염수 분무테스트에서도 이상이 없는 제품입니다.
필요하시면 연락 바랍니다.
enghs11@yahoo.co.kr
RustBulletEngineering.hwp
또한 염수 분무테스트에서도 이상이 없는 제품입니다.
필요하시면 연락 바랍니다.
enghs11@yahoo.co.kr
RustBulletEngineering.hwp
공지사항
산처리는 곤란하고 Grind는 한계가 있지요
Sandblast라고 하는 것이 단순히 녹만을 제거하는 것 뿐만아니라 Paint가 잘 달라 붙도록 Anchor Pattern을 만들어 주는 역할을 해야 하는 데, 이렇게 할려면 Sand 혹은 Shot이나 Grit로 Blast Cleaning을 하는 게 제일 좋습니다.
그런데 아마도 현재 그렇게 응축수가 나오는 정도라고 하면 Paint를 해도 그리 오랜 수명을 보장하기는 어려울 것입니다.
이 역시 그러려니 하고 그냥 사용해 가면서 수시로 열어서 물 빼고, 녹 많이 발생한 부위는 녹 제거라고 Paint Touch-up해 가면서 사용하는 게 제일이지요.
내부 압력이 크지 않고, 온도가 낮으며, 특별한 용도가 아니라면 FRP등과 같은 비금속 재질의 Tank도 차기에는 변경을 고려해 볼 수 있습니다.