Basic standards for seamless and welded pipe packaging | Technical requirements for steel pipe packaging and transportation
1) General requirements
1. The packaging should be able to prevent seamless pipes and welded steel pipes from loosening, deformation and damage during normal handling, transportation and storage.
2. If the buyer has special requirements for the packaging materials and packaging methods of the steel pipes, they should be stated in the contract. If not specified, packaging materials and packaging methods are chosen by the supplier.
2) Packaging materials
1. Packaging materials should comply with relevant standards. Packaging materials not included or specified in this document shall be of a quality suitable for the intended use. Packaging materials can change according to technological and economic developments.
2. The design and use of packaging materials should consider reuse, recycling and recycling.
3. The bundling materials used for bundle packaging can be steel belts, steel wires, wire rods or non-metallic flexible materials.
4. According to the requirements of the purchaser, in order to protect the steel pipe and/or binding material from damage, protective materials can be used between steel pipes and steel pipes and between steel pipes and binding materials. The protective material may be wood, metal, fiberboard, plastic or other suitable materials.
5. According to the requirements of the purchaser, if there are requirements for cleaning the surface of the steel pipe, protective packaging materials can be used during packaging. Commonly used protective packaging materials include kraft paper, vapor phase anti-rust paper, greaseproof paper, plastic film, sackcloth, plastic sheeting, and plastic sealing caps.
6. According to the requirements of the purchaser, the surface of the steel pipe can be coated with a protective layer. The pipe coating should be of anti-corrosion material, and when necessary, the coating method, coating thickness, and ease of removal should be considered. If the purchaser does not indicate this in the contract, the coating material shall be selected by the supplier.
3) Bundling and packaging
1. Steel pipes with an outer diameter greater than 159mm or special-shaped steel pipes with a cross-sectional circumference greater than 500mm can be delivered in bulk. It is recommended that other steel pipes be delivered in bundles.
2. Bundles of steel pipes should be tightly bundled with binding materials.
3. Each bundle should be steel pipes of the same batch number (except those approved by product standards).
4. The weight of each bundle of polished steel pipes, precision steel pipes and cold-drawn (rolled) stainless steel pipes should not exceed 2500kg, and the weight of each bundle of other steel pipes should not exceed 5000kg. Upon agreement between the supplier and the buyer and stated in the contract, other regulations may be adopted for the weight of each bundle of steel pipes.
5. Steel pipe bundled packaging can be used in general packaging, rectangular packaging, frame packaging and hexagonal packaging. The bundling parts should be 300mm to 500mm away from both ends of the steel pipe, and evenly distributed in each pass. After negotiation between the supply and demand parties, other bundled packaging forms can also be used.
6. The number of bundles of each bundle of steel pipes should comply with the requirements in the table below.
Length of each bundle of steel pipes
|
Minimum number of bundling lanes
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Length difference of steel pipes in each bundle
|
|
≤3
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2
|
--
|
|
>3-4.5
|
3
|
|
>4.5-7
|
4
|
≤1.0
|
|
>7-10
|
5
|
|
>10
|
6
|
≤1.5
|
7. When bundling steel wires, each pass should be twisted into at least 2 strands, and the number of steel wire strands per pass should be increased according to the increase in the outer diameter of the steel pipe and the weight of each bundle of steel pipes.
8. One end of each bundle of steel pipes should be flush, and the maximum length and minimum length difference of a single steel pipe at the other end should comply with the regulations in the table.
9. Steel pipes delivered in fixed length or multiple lengths should be bundled and packaged separately when paired with steel pipes delivered in non-fixed length or multiple lengths. Short length steel pipes should be bundled and packaged individually.
10. Before bundling polished steel pipes and precision steel pipes, the inner and outer surfaces should be coated with anti-rust oil or other anti-rust agents, and wrapped in moisture-proof paper and sack cloth (or woven tape, plastic cloth) in sequence.
4) Container packaging
1. After negotiation between the supply and demand parties and stated in the contract, cold-drawn or cold-rolled seamless steel pipes with a wall thickness not greater than 1.5mm, electric welded steel pipes with a wall thickness not greater than 1mm, surface-polished hot-rolled stainless steel pipes and surface roughness Ra are not Precision steel pipes larger than 3.2μm can be packed in sturdy containers (such as iron boxes and wooden boxes).
2. The weight of steel pipes that can be loaded into each container should comply with the standards. The weight of steel pipes that can be loaded into each container can be increased through negotiation between the supply and demand parties.
3. When the steel pipe is loaded into the container, the inner wall of the container should be lined with linoleum paper, plastic sheeting or other moisture-proof materials. Steel pipes should not be loose in the container to prevent external surface damage caused by collision and friction of the steel pipes in the container during hoisting and transportation. Bundling, brackets, etc. can be used for fixing. The outside of the container should be firmly tied with steel belts, double-stranded steel wires or other methods.
4. Pipe joints should be packed into containers when shipped separately, and the weight of each container should not exceed 250kg.
5) Stainless steel tube packaging
1. Stainless steel thin-walled steel pipes with a ratio of wall thickness to outer diameter less than 3% should be bundled as shown in Figure 3, or packed in containers; large-diameter stainless steel pipes should be added with supports at both ends to avoid transportation, loading and unloading Deformation occurs during the process.
2. Polished stainless steel pipes should be wrapped one by one with plastic film before being bundled; cold-drawn or cold-rolled stainless steel pipes should be tightly wrapped with no less than two layers of sack cloth, woven tape or plastic sheeting before being bundled. There should be protective materials between stainless steel pipes and steel strips or wires;
3. Other stainless steel pipes adopt appropriate packaging methods depending on the type, final process, size and transportation method.
6) Thread and pipe end protection
1. Steel pipes with threaded ends should be screwed with thread protectors. Threaded welded steel pipes with a nominal diameter less than 65mm for low-pressure fluid transportation do not need to be screwed with thread protectors. According to the requirements of the purchaser and stated in the contract, the threaded steel pipe can be delivered by the manufacturer with the pipe joint screwed on one end. The threads and machined surfaces of threaded steel pipes and their pipe joints should be coated with thread grease, anti-rust oil or other anti-rust agents.
2. According to the requirements of the purchaser, pipe end protectors can be added to both ends of steel pipes with beveled pipe ends.
