Edit: DE patched the rapid Base Standing gain, so that pipe will never net you much more than 100 Base Standing anymore. You can still get standing in the high 2000s by repeatedly making short hops and doing tricks while grinding, building your multiplier to 20x+, but getting exactly 3000 standing will be much harder. If there is a longer pipe somewhere in Orb Vallis, that place would be better for getting 3000 standing.
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Location in video is to the left of the Fortuna elevator, around the corner, where there is a long pipe.
The goal of this farm is to reliably and repeatedly get the maximum of 3000 standing points. Since high Mastery Rank players cap out at around ~25k standing, you only need to do what is shown in the video 6-7 times to cap out, making this easy and quick once you get it down.
Detailed Notes:
Final Standing = Base Standing * Multiplier. Final Standing is capped at 3000. We must raise both Base Standing and Multiplier.
To maximize Base Standing accumulation while grinding on a rail, we must first get lots of air time while grabbing the board (holding left click) before we hit the rail. To do this, we charge up the jump by holding spacebar and let go after a while for max jump height. While this is occurring, we hold left click to grab the board. Max jump height while holding left click for all of the upward movement and most of the fall gives us a plenty of air time while grabbing the board. When grinding is engaged by holding ctrl, base standing rises quickly -- far quicker than if we did not grab onto the board.
To increase the multiplier, we need to weave in tricks while grinding. In the video, I do spin jumps, though other tricks are possible, such as flips by pressing right click + direction. The multiplier increases every time we do a trick. However, we cannot do two tricks in a row (and get the "Copykavat" message) or else the multiplier cannot increase. We can circumvent this by grabbing the board (holding left click) while doing the same trick. This counts as a separate trick. The trick afterward should then be done without holding left click. For example:
Spin jump, Spin Jump + Left Click, Spin Jump
Spamming tricks isn't necessary for the whole length of the pipe. For that pipe in particular, it is long enough to accumulate around 300 Base Standing. Thus, a multiplier of around 10x is sufficient to reach 3000 Final Standing.