Storage and Transportation Technology: [Weekly Topic] April 30–May 6 – What considerations should be taken into account when selecting and installing crane pipes for train loading/unloading trestles?
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This post was last edited by MintLife on 2011-4-29 08:28. I would like to ask everyone what considerations should be taken into account during the selection and installation of crane pipes for train loading and unloading platforms, as well as which standards apply in this regard. Thank you! Large rewards for those who actively participate in the discussions
Unloading flexibles generally come equipped with submersible pumps, while loading flexibles now have sealing covers to reduce the evaporation of oil and gas during loading. For loading at refineries, large flexibles are usually used. When preparing installation drawings, it is important to ensure that the center line of the flexibles aligns with the center line of the two dedicated railway tracks, but not with the center line of the pier; a passage should be left on the pier for maintenance and access by personnel. There are not many specific regulations regarding this, and generally the \"Design Code for Oil Depots\" along with some reference books are used
Agree with what was said above; if it’s a design-related issue, it’s best to discuss it with the manufacturer, as they usually have many practical suggestions based on their experience.
It seems that there are always engineering technicians who have questions regarding the selection of flexible hoses. In fact, you don’t need to worry about this; you just need to treat the flexible hose as a section of movable piping, and determine a series of process parameters such as the pipe diameter, flow velocity, flow rate, and pump head. Leave the rest to the technicians at the hose manufacturer. Generally speaking, the selection of a flexible hose is based on the properties of the medium and the conditions under which loading and unloading take place. The key considerations include (but are not limited to) the following: 1. Loading or unloading: For train loading and unloading, top-loading is the common method, while only media with high viscosity such as asphalt and residue are unloaded from below; accordingly, either top-loading or bottom-loading flexible hoses should be chosen. 2. Properties of the medium: For volatile and toxic/hazardous media, a sealing cap and a gas return line should be installed when loading them from the top; for such media, it is advisable to use submersible pumps during unloading from the top in order to overcome gas resistance ； The flexible hose pipelines for easily solidifying media should be equipped with a heating system ； Liquefied gas media should be loaded and unloaded using fully enclosed connections (quick connectors or flange connections). 3. Selection of flexible hose accessories: For media that are liquids at normal temperature and pressure and are transported in sealed containers, an anti-overflow system should be installed ； Liquefied gas media should be equipped with quick-close ball valves, relief systems, etc ； The loading dip pipe should be equipped with a mechanism that prevents the dip pipe from moving upward due to the backpressure of the medium, such as an outer arm lock ； The flexibles used for oil and gas recovery should ensure a tight seal at all costs, including cylinder compression and new types of sealing caps. In my opinion, greater communication and collaboration between engineering and technical personnel as well as those from manufacturing companies is the best way to ensure the correct selection of flexible hoses.
Agree with the view on floor 4. In short, thorough communication between the design institute and the manufacturer will ensure the right flexible hose is selected!
Reply to 4# Oil transfer arm: Thank you, everyone!
Please refer to \"SH/T 3107-2000 Design Code for Railway Loading and Unloading Facilities for Petrochemical Liquid Materials.\"
Our company is currently selecting a flexible hose for use in our railway siding, where loading operations involving gasoline and diesel are carried out. Could those with experience please recommend a fully automatic loading system? The loading of 3,000 tons of gasoline or diesel should be completed within 2-3 hours, and 2-3 operators should be sufficient to carry out all the tasks.
The AL1402 model of flexible hose is selected; the vertical section is an aluminum telescopic sleeve with a diameter of DN100, which meets the requirements for loading.
Reply to 8# bingyuan: Check out this thread at http://bbs.hcbbs.com/viewthread.php?tid=674586. The highest loading rate we achieved was 1500 tons per hour, and this was achieved by loading multiple cargo holds simultaneously. I calculated that for a maximum flow rate of 4.5 m/s, a flexible hose of approximately 320 mm in diameter would be needed; if a DN100 pipe is used, then at least 3–4 such hoses need to be loaded onto the vehicle simultaneously. This is purely my personal opinion; I welcome any corrections.
I suggest communicating with the on-site operators instead