How is the maximum flow rate of a flexible hose calculated?

Whether it is a large or small flexible hose, I believe that its maximum flow rate depends primarily on the maximum flow rate of the loading pump；

The pipe diameter multiplied by the maximum flow velocity gives the maximum flow rate, but VD must be followed

This post was last edited and replied to by hongshan0901 on 2010-5-30 18:06. Reply 3# Transfer arm: The poster is absolutely right; this is specified in the design standards for oil depots； The maximum flow rate specified by us (4.5 m/s) is relatively low; if oil spill prevention measures are effective, this flow rate could be increased. This is especially true when upgrading loading systems that make use of existing facilities such as pumps and transfer pipes, as it allows for cost savings in terms of engineering investments ； This impression is quite strong, as I made a mistake when first starting out in design: I used a top-mounted dip pipe of DN80 (reused from previous projects), and I forgot to calculate the flow rate of that dip pipe; the flow rate was too high, at 4.66 m/s. I checked many standards at the time – those from Europe, the United States, and Japan all specified a maximum flow rate of around 6.5 m/s – but our own standards did not allow such a value. As a result, I lost some of my bonus money; haha, what a lesson!

Calculated based on the maximum speed, the flow rate of a DN100 dip pipe is around 120 cubic meters per hour – isn’t that a bit slow? I would like to ask the teachers.

Reply to 5# moviewang2009: Bro, 120 RMB per hour is fine; if the data usage is higher, it will result in speeding violations, hehe

The flow rate of a dip pipe with DN80 is generally 50 cubic meters per hour, while for a dip pipe with DN100, the flow rate is usually around 80 cubic meters per hour; it can be higher as well, but the flow velocity must not exceed 4.5 meters per hour.

I just completed a project; the maximum flow rate for the loading pump was set at 120 m3/h, with the dip pipe having a DN100 diameter. The flow rate seems a bit high, but I couldn’t find any mandatory regulations specifying the flow rate for loading operations. . .

Reply to 3# Transfer arm: Which specifications specify a speed of less than 7 m/s? Thank you!

Check HGT3143-1982 for the instructions

Reply to 9# rain666: It seems that the flexible hose is inserted into the tank truck, with the liquid level being above the hose; for details, refer to the \"Petrochemical Pipeline Design Manual\"