I would like some information on pipeline anti-corrosion

“\"Three oils and two cloths\" – glass cloth is generally the one that is used most often. The process is as follows: apply a layer of anti-corrosion oil, then wrap it with glass cloth; apply another layer of anti-corrosion oil and wrap it with glass cloth again; finally, apply one more layer of anti-corrosion oil. In total, this involves three layers of oil and two layers of glass cloth. The role of the cloth is mainly to increase the tensile strength of the anti-corrosion layer, preventing cracks and water leakage once the anti-corrosion oil hardens. Pipeline anti-corrosion, width: , 50-300 thickness: , 1.1-1.50

Poster: Is 20% curing agent used? ? ? ? ? Did you hear that wrong, or did they use it incorrectly? Generally, the amount of curing agent used should not exceed 2%

The pitch is appropriate; it’s correct to use glass wool as the material. The fabric used for anti-corrosion joints needs to be at least 500 mm in length. The thickness required for anti-corrosion purposes can be determined in accordance with the relevant standards for industrial buildings, and the evaluation criteria can also be based on the construction specifications for fiberglass products.

1. The amount of curing agent used generally does not exceed 2%, not the 20% they mentioned； 2. The so-called glass cloth generally refers to 450g glass mat and 30g glass facing, depending on the requirements specified in the construction technical specifications ； 3. The specific width depends on the area that needs to be protected from corrosion; if protection is required only at the welds, then the width for such protection should be no less than 80 mm ； 4. After curing, the thickness of three oils and two resins is generally around 1.2–1.5, depending on the amount of resin used ； 5. The construction quality is primarily determined by whether there are any bubbles in the final anti-corrosion layer; if so, it must be sanded and treated again.

What was said upstairs is correct – the width of the wrapping used for joining pipes is related to the diameter of the pipes; generally, the thicker the pipes, the greater the wrapping width and the more layers are required. As for the 20% curing agent mentioned by the original poster, since PVC welding is involved, the contractor might, in order to save money, use ordinary epoxy resin on the outside, merely to enhance mechanical strength, without considering corrosion protection for the internal medium.

This post was last edited by tl1380843633 on 2010-1-5 00:03. 1. The anti-corrosion worker said that the materials used for anti-corrosion are: epoxy resin + curing agent (20%) + thinner (30%–40%, which can vary depending on the climate and the temperature of the pipes). The percentages mentioned refer to weight percentages. Is this ratio appropriate? The curing agent must be determined based on the type of epoxy and the variety of curing agent used. It was mentioned above that 2% is used; however, curing agents for common epoxy resins such as E44 do not have a 2% concentration. A concentration of 20% is generally appropriate for resins like T31 ； A diluent addition rate of 30%–40% is too high, which affects the properties after curing. 2. For the interface, the method of \"three oils and two fabrics\" is used; the fabric employed is said to be glass wool – I’m not sure if that’s correct It shouldn’t be glass wool; it should be glass cloth. 3. Are there any specific requirements regarding the width of the anti-corrosion coating? It was observed on site that the total length of the anti-corrosion coating does not exceed 30 cm – is this appropriate? Too narrow! It should be greater than 50 cm. 4. Are there any requirements regarding the thickness of the anti-corrosion layer? Or what is the typical required total thickness for a three-oil-two-cloth coating after curing? For PVC welds reinforced with fiberglass, the thickness of the fiberglass should be determined based on the pressure to which the pipeline will be subjected; the purpose of using fiberglass is to provide reinforcement. Generally, using only three layers of resin and two layers of fabric is insufficient, and the thickness after curing should be greater than 0.6 mm. 5. If supervision is carried out on-site, how should the quality of construction be evaluated? Important note: The thickness of the glass cloth used must be greater than 0.2 mm; otherwise, it does not meet the standard requirements ； After curing, the surface should be fully coated with glue, free of bubbles and pinholes.

I agree with this person; just by looking at the post, it seems that the proportion of rare materials is too high. It’s okay in hot weather, but it’s really tough in cold weather

We use epoxy resin linings, and the results are quite good; the main concern is impact. The ratios mentioned above are mass ratios.