Our friends over at the American Alpine Institute have a great blog that provides of wealth of information. Recently they posted an article about anchors and we thought you might enjoy the read. They have posted many other great articles – be sure to check out their blog for more! Thanks Jason!
The American Alpine Institute is a climbing school and guide service that operates in six states and sixteen countries. Since the company’s inception in 1975, the Institute has focused on climber education, with courses and guided ascents available to beginner, intermediate and advanced level climbers. The following article is from AAI’s award winning blog at www.alpineinstitute.blogspot.com. To learn more about AAI, log onto www.alpineinstitute.com.
Many climbers find the transition from top-roped climbing into leading to be daunting. This is especially daunting when the move is tinged with the possibility that you will have to build your own traditional anchor. It’s scary because at first it’s quite difficult to trust an anchor that you’ve built. It’s scary because maybe there aren’t that many pieces in the anchor or maybe the rock is bad.
The angles on this particular anchor are a bit wide between each of the outside pieces.
In an ideal three piece anchor all of the pieces are completely solid. In an ideal anchor each of the pieces can hold a tremendous amount of weight by themselves. In an ideal anchor, the powerpoint can easily hold ten times the weight of the two climbers on the route.
But what if it can’t?
When the pieces aren’t solid, you have to add more. To keep it simple, the best way to add more pieces is to add them in series. This is a method wherein one SRENE anchor is stacked on top of another SRENE Anchor. This system allows a climber to do a couple of things. First it allows one to add more pieces to the anchor. Second, it allows those pieces to be added in a simplistic way that makes sense with a cordellette or an extra sling. And third, it spreads out the weight at the powerpoint into more equalized pieces.
In the picture above, the left hand leg of the cordellette terminates in a sling clipped to two pieces and equalized with a magic x. The problem with a magic x in this kind of system is that if one of those left hand pieces blows out, the sling will become limp and the weight will not automatically transfer to the other piece in the magic x. If this happens, then all of the weight will be placed on the two pieces on the right.
It’s better to build two pre-equalized anchors on top of each other when working in series. However, occasionally this isn’t possible and you’re forced to work with a magic x. When that happens, make sure that the pieces that are not a part of the x are extremely strong.
because the climber only had two double-shoulder length runners to build an anchor.
There are many other ways to add additional pieces to an anchor and to keep it SRENE, but for many who are just dipping their toes into the world of leading, anchors in series make a lot of sense. Most guides recommend that beginning level leaders work with anchors in series for a significant period of time before experimenting with other systems. This will help lay a solid intellectual framework of what an anchor is supposed to look like and what it is supposed to do.
–Jason D. Martin