Hi!
I try to understand why you created a new route=pipeline relation here.
relation/8279171
Most of it repeats the information of the much older route relation relation/8279171
There is also one way that doesn't seem to be part of it:
way/123724670

Hi! I found this highway=yes and wonder if you meant service?
way/616154205

Hi!
Please try to fix the errors reported by JOSM before you upload the data, There are several ways with duplicated segments and duplicated nodes as well as duplicated objects, e,g. way/641972450 and way/641972482 both describe the same stairs, which probably should be mapped as highway=steps not stairs=yes

Hi!
I fixed a typo here, please check if I got it right:
changeset/64282446

Hi!
This changeset created invalid tags like highway=unclassified;tertiary
name=Camin dels Prats Grands;Chemin Toulze
and added ref=D 18.
I've reverted it here: changeset/64282381
No idea what you wanted to map.

Hi!
This looks like a bad import to me. What does it mean when you add a way with 59 tags and most of them have the value null?
e.g. way/641882590
Please revert or let me know if you need help with that.

Hi! I've noticed that you map buildings at the position of the roof in the aerial image. This doesn't work well for high buildings, e.g. way/638502221
Please try to estimate the position on the ground. See also osm.wiki/Buildings#How_to_map

Ja, sorry, hatte den Link vergessen:
way/38804490

Hi Karl,
the value boardwalk has no meaning in OSM. Please check highway=*
to find out more. You can find a list of your changesets by clicking on your user name or use this link @Ipswichkarl

Moin!
Ich frage mich gerade, wie der Pfad way/51732243
ein Teil der WEDAL Pipeline sein kann.
Sieht nach einem Versehen aus.
relation/8197801

Hi!
You changed a man_made=pipeline to highway=secondary here. If I got that right there is a road next to the pipeline and you should have created a new way for that road.

I found a lot of unconnected roads in this area, most of them created by you. It seems that iD doesn't warn you when you create a new road that crosses other roads without a connection?
I've corrected many problems here:
changeset/64253905
changeset/64254070

Hi!
I wonder why you did not connect the ends of the bus_guide ways like this way/641631549
This is a very special kind of road, please check highway=bus_guideway
to make sure that you used the right tagging.

Hi and welcome to OSM!
The tag highway=boardwalk is only used here, why did you change highway=footway?

OK, thanks for the feedback :-)

Ah, I see. Whenever the wiki shows a highway=* that means that you should replace the * by a meaningful value. Not only with highway, this is always true.
I see no need to map the area, esp. not when you alse map the node with highway=turning_circle

Thanks Sean,
I'll change the island tomorrow. On some other similar objects I simply changed the natural tag to was:natural=coastline, that should be OK for this one as well.

I've only read the comments in the thread after you mentioned the TAP. I think nobody agreed with you in those comments.
See e.g. http://gis.19327.n8.nabble.com/How-to-tag-named-group-of-named-water-areas-tp5923692p5926559.html
I've just loaded all relations with route=pipeline. They have a total of 4119 way members, 3667 of them have the man_made=pipeline tag, most of those ways which are not tagged man_made=pipeline are in fact not pipelines but waterways, fences , highways, piers , you name it. In other words, quite a lot of garbage.
A consumer cannot simply assume that all members are pipelines.
Now, guess what happens when you remove the tags from the ways which describe what it is.

Hi Dave,
I think each type of relation has its own rules. You cannot simply transfer the rules for multipolygons. Example: In mp rels the order of the members doesn't matter, in hiking relations it is important. In mp rels also the roles do not really matter because consumere programs don't need them, they are only important for the mappers. In other relation types the roles are very important. In case of route=pipeline rels
there are not many documented rules because they are not important to many users. If you want to establish a new tagging system for pipelines you have a good chance, you just have to convince those who are interested. I am not one of them, I just try to convince you that you should not start to do your own thing just because it looks better to you. You simply risk that someone reverts your work
when you act against common rules.

Reg. Iditarod Trail: If you want to remove the name tags from the ways I say that is good. These ways probably have no name, they are just part of a route.
I did something like that, see this discussion:
changeset/13576057