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    Home > Coatings News > Paints and Coatings Market > Series: Construction of solvent-free epoxy coatings in the ship's freshwater/drinking water tank (II)

    Series: Construction of solvent-free epoxy coatings in the ship's freshwater/drinking water tank (II)

    • Last Update: 2020-11-18
    • Source: Internet
    • Author: User
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    9.
    of structural defects.
    to organize joint inspections to repair welds and steel surface defects. Focus on checking for defects such as sharp edges, gas cutting edges, pores, bite edges, splashes, intermittent welding, and steel surface overlaps, pits, etc
    china
    . Structural expertise is required to fix the defect.
    10.
    The cabin is de-oiled and washed.
    First alkaline cleaning agent to remove oil, and then high-pressure fresh water flushing, focus on cleaning welds and floor areas, because in these areas are most prone to residual salt and other pollutants, ventilation and drying, salt testing, to ensure that the salt content is lower than the specification requirements, the general freshwater cabin salt content requirements are less than
    50 mg / m
    2
    .
    photo
    13
    : Salt testing before blasting
    Photo
    14
    : Salt testing before sand blasting
    11.
    pre-blast.
    1)
    Pre-blast the weld area to further examine and repair structural defects
    2)
    Some shipowners or project personnel will require the floor to be flushed out when pre-sanding, pre-sanding and structural defects are treated and flushed again with high-pressure fresh water, with the ultimate aim of reducing the salt content on the floor. The editor thinks this is certainly better, but adds extra work. After the cabin is flushed and dried, everyone is required to wear foot gloves in the cabin to minimize contamination.
    Photo
    15
    : Mark Structural Defects Processing
    Photos
    16
    : Tag Structural Defects Processing
    Photos
    17
    : Tag Structural Defects
    Photos
    18
    : Tag Structural Defects Processing
    12.
    Ventilation dehumidification.
    1)
    Dehumidification begins when sanding begins. Summer cooling dehumidification, winter heating dehumidification,
    2)
    ventilation dehumidification requirements no dead end. The ducts should be long enough to be distributed from top to bottom along the hatch, and for the roof and bottom of the cabin, a ring-shaped tube is recommended to ensure effective ventilation in each compartment. According to the experience of the small editor, a
    1500
    cubic compartment, scaffolding
    "
    back
    "
    glyphs, along the
    "
    back
    "
    word four corners from bottom to top distribution of four wind pipes can be;
    3)
    wind pipe to be fixed, pay attention not to close to the wall, so as not to cover the part of the pipe can not be constructed;
    4)
    the end of the wind pipe is wrapped and fixed to the scaffolding, according to the needs of the wind pipe opening, a basic principle is to blow to the surface of the steel plate, that is, the roof to the opening, the bottom of the cabin to the lower opening, the middle blow to the wall;
    5)
    the air pipe at least three times, once after sanding,
    after
    1 degree paint is sprayed,
    is
    after the 2 degree paint is sprayed. Because the paint after spraying on the wind pipe will remain a lot of paint fog, hard dry will fall off the piece of pollution intact coating;
    6)
    some parts are inevitably blocked by the wind pipe, these blocking parts must be replaced when the wind pipe shift or shift, and the necessary treatment (such as sandpaper grinding), second-degree paint construction or repair can be repaired.
    Photo
    19
    : Ventilation dehumidification requires no dead ends
    Photo
    20
    : Ductes open towards the wall to ensure that the wind blows to the wall
    13.
    Lighting.
    1)
    This is also critical, as inadequate lighting can lead to safety problems on the one hand and many details on the other.
    2)
    Lighting should be in accordance with the specifications of the use of explosion-proof lamps, ordinary lamps prohibited from use.
    14.
    Blast.
    1)
    Dehumidification is necessary at the beginning of the sanding. Workers into the cabin requires wearing shoes, gloves, summer even requires wearing a cockpit, the purpose is to prevent salt pollution, there is also a saying that there is a humidity requirements, the purpose is to allow workers to reduce sweat, to avoid sweat pollution of the steel surface, it seems that there is a certain reason;
    2)
    Because it is in the platform stage sanding, on-site abrasives are generally used copper ore, must purchase new abrasives, pay attention to the particle size of abrasives, many abrasive suppliers in order to save money, the used scrap copper ore sand mixed with some new sand as a new abrasive to sell, such abrasives there is a lot of dust, sand cleaning will be a big problem. Abrasive arrived at the scene after grabbing an abrasive to check the basic can determine whether mixed with waste abrasives. As for the abrasive particle size, cleanliness and salt content detection on the specification book, the actual operation can be detected as a reference.
    15.
    Clean.
    1)
    Cleaning is a big problem, first clean the abrasives with a sand absorber, and then use a vacuum cleaner to further clean the dust. Some contractors make their own steel tubular joints, one end is connected to the main sand hose, the other end is divided into more than ten small joints connected to the vacuum cleaner hose, such a sand straw can be divided into more than ten people to use, improve cleaning efficiency;
    2)
    Pay attention to the position of the buckle, the end of the frame tube, the residual abrasive cleaning on the pedal, some pedal back-end design has a groove will retain the abrasive, at this time also need to further clean the pedal abrasive;
    3)
    Cleaning is endless, small editor in the field has also encountered a lot of clean wild roads, sometimes the construction side will be on the springboard a few feet or take a steel pipe to hit the main pillar scaffolding, hidden in the scaffolding abrasives will also squeal down a lot;
    4)
    recommends adding additional pumping facilities in addition to ventilation during sanding and cleaning to speed up dust discharge and improve cleaning efficiency;
    5)
    some dust will remain on the steel plate. Therefore, the vacuum cleaner needs to be attached to the steel plate to suck back and forth several times in order to clean. It is recommended to use a vacuum cleaner with a brush at the end to improve the cleaning effect. Sometimes you will find a lot of dust left on the surface of the steel plate, shake whether the air humidity exceeds the standard, too much humidity will cause the dust to stick to the surface of the steel plate can not be cleaned
    6)
    pay special attention to the floor, strengthen the front of the plate cleaning, these places may remain dust, abrasives and other pollutants
    7)
    tube head tape or blocking the head;
    8)
    The floor needs to be cleaned several times to eventually reduce contaminants, pre-coated before the gunner up and down scaffolding, pull the gun belt process will produce new contaminants spilled on the floor, so it is recommended to finally reserve a sand straw on the floor, at any time to clean the floor, until the final paint spray.
    16.
    Protection.
    1)
    Each layer of scaffolding is wrapped in plastic film to prevent dust and abrasives from spilling on the steel plate. Due to the presence of ventilation and dehumidification in the cabin, when encased should also pay attention to clean, the film fixed to the scaffolding, to avoid floating around;
    2)
    all the floor protection, to avoid paint pollution, paint and then take off and the floor for the final cleaning and then spray paint. This scheme is theoretically feasible, but in the actual operation process, many cabin floor structure is more complex, there are more reinforced ribs, scaffolding and so on, it is difficult to fully and effectively protect, and finally the floor wet paint fog is particularly many, all kinds of protection are glued together, it is difficult to carry out effective cleaning;
    3)
    small editor has been in contact with another practice, the bottom layer of scaffolding all ceiling, any gap is blocked, scaffolding and the gap between the wall wall is also blocked, only at the upper and lower ladder mouth reserved a move mouth can be up and down personnel, so that the floor does not need to protect also avoid paint fog pollution, spray the bottom layer when the protection can be removed, this is the best way in my opinion, the specific operation in the pre-painting link;
    4)
    suggested that after the first paint construction paint to reach a hard dry state on the arrangement of protective film and pipe replacement, and the whole cabin cleaning, must be replaced in a timely manner, once the time is too long, Protection and paint on the wind pipe will fall off and scatter on the steel plate during removal, which is very difficult to clean. There are also some shipyards directly on the original protection of a new layer of protective film, personally think it is better to replace.
    Photo
    21
    : The bottom layer of all ceilings, avoiding paint fog falling to the floor
    Photo
    22
    : Protection between the first floor pedal and the hatch, preventing paint fog from falling to the floor
    Photo
    23
    : Pedal anti-pedal Face ceiling protection
    Photo
    24
    : First scaffolding all ceiling, ensure that paint mist does not fall to the floor
    Photo
    25
    : Floor Protection
    Photo
    26
    : Floor protection
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