I greet you, dear reader!
In accordance with Gos.standarta for various hot-rolled metal product (including according to GOST 5781-82, GOST 8509-93, GOST 8240-97, GOST 8239-89, etc.), Whether it be fitting, steel equal angles, as well as the channels, I-beams and so on. - all made up to 12 m (measured length, the length or multiple dimensional random length), but also in each of the guest. provided a manufacturing tolerance of products of more than 12 m., but with the proviso that only with the consent of the consumer and manufacturer.
Why is the main size molded products and long steel producers reduce it to a length of 11.7 m.?
The thing is that it is the manufacturer because of the economic benefits customize products for transportable size, ie, takes into account the transport logistics.
During transport through both rail links and common elongated semi - length transported elements should not exceed 12 m (Provoznoj dimension), since the maximum possible length (inside dimension) of both the small old sample gondola car and trailer is elongated bead 12 m.
Freight train depends on the size of the rolling stock, which are required to fit even the developers of military equipment, and we're on some kind of metal rolling speak))). And the length of the transported elements may also increase, provided if you replace all rolling stock, which is economically completely inappropriate!
So why is 11.7 m., Instead of 12 m.
Firstly, the products are divided into packs of metal, in which the articles are offset from each other and do not have a strict pritortsovannosti at one end.
Second, the cutting accuracy is an error in a smaller, and in a big way, which also accounted for.
Third, for fixing the cargo in vehicles stretching applied, strapping, wooden racks, panels, resistant frames, etc. These fastening means also take up some space.
Fourth, the stacking order of items in various machinery and devices made according to the respective flow charts with strictly spelled out list loading and unloading operations, in connection with which to manipulate the cargo must be provided a space in all planes.
An example of "flow chart":
- make a fixation of the rolling stock, setting the brake shoes;
- fix signaling pad on the opposite side from the loading / unloading lines;
- explore the fastening and securing elements of the load;
- perform the linking of the goods;
- make procrastination and leave the loading / unloading zone;
- to lift the load and ensure the reliability of fixation and alignment;
- lower the load for subsequent transport.
Of course, production of products of 11.7 meters is not stopped, and the order may be any other length according to GOST, buttransportation cost will be is not the same.
On some Metal we can also see products not only 11,7m., But already 12 m., Since transportation have been used for more new gondola with capacity for up to 13,7m., forcing the Soviet compositions.
There are long-length and a plurality of rolling units from the load capacity of up to 20 m. who are fully able to provide transportation of the ordered products, but it will have to pay.
In view of the above, the entire range of metal introduced to the market in 90% of cases - is no longer than 12 m.
That's all, thank you for your attention!
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