I had two different safety-related questions come up over the weekend:
1) I understand the rationale in thinking that a saddle is generally safer than a stand/safety harness combo, but am I missing something in thinking that a saddle presents a single point of failure? Meaning, if the bridge or tether were to fail, there's no backup? In my mind with a stand, the stand itself is the first protection, and the safety harness is there just in case the stand fails.
2) Is a friction not effective if frozen? I had the prussic knot on my lifeline freeze up while sitting in the stand over the weekend. Climbing down, I was able to get it to budge, though it was still almost entirely frozen, so much so that it slid very freely up and down the lifeline. In this sort of case, would the force of a fall likely be enough to free the knot up to grab? In this case, the temperature was only mid-20s, though that got me wondering even more about the safety of a lifeline when it's even colder out.
1) I understand the rationale in thinking that a saddle is generally safer than a stand/safety harness combo, but am I missing something in thinking that a saddle presents a single point of failure? Meaning, if the bridge or tether were to fail, there's no backup? In my mind with a stand, the stand itself is the first protection, and the safety harness is there just in case the stand fails.
2) Is a friction not effective if frozen? I had the prussic knot on my lifeline freeze up while sitting in the stand over the weekend. Climbing down, I was able to get it to budge, though it was still almost entirely frozen, so much so that it slid very freely up and down the lifeline. In this sort of case, would the force of a fall likely be enough to free the knot up to grab? In this case, the temperature was only mid-20s, though that got me wondering even more about the safety of a lifeline when it's even colder out.