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tgc135 last won the day on November 10 2013

tgc135 had the most liked content!

About tgc135

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    learning the forum ropes

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  1. Yip, that is the only thing to do. But I'm not asking this so as to have a guide of when it is safe to work or not though. This is a question about forces influencing others and whether these pertain to rope access or not. If working on a vessel during a small 1m swell and all the circumstances line up against you and there is a chance that your fall factor 1 produces forces similar to a factor 2, it's definatly something worth being aware about. I'm not saying it can happen, I'm just wondering.
  2. While helping out on a lifting gear suvey, it was pointed out that all lifting gear used in an offshore environment needs a higher saftey factor built in to accomodate the dynamic forces provided by the environment. This makes sense to me, I can see how if a crane is lifting a load from another vessel, that the pitch and roll of the two vessels can easily create situations that can shock load the lifting gear. In order to find the correct margin with which to increase the saftey factor, i asume that someone has sat down for a very long while and done some serious Maths and came u
  3. Not having much experience with anchors failing and tripods, this is pure speculation, but I would have to say that yes, it would be a concern here. The original diagram (before I drew in the ASAPs) takes the angle that the forces are applied in order to lift the load into account and cancelled them out with the anchor to the ground on the right going in the opposite direction. I doubt that this tripod would remain stable after a bit of shock loading if one side of the system fails. You are right that as it stands one would also have to change something to continue hauling. Saying that thou
  4. Bingo! Fairfield, that is exactly what I saw. An ASAP needs at least 50cm below it to engage reliably. Nicely spotted!
  5. So... This is not a system I intend to use. I definitely do not recommend it's use. This started as a thought provoking exercise and will remain just that. What is so great about it is that almost everybody remarks on the lack of a backup rope. As it is, this system works as a main line and a backup line all in one.... If you disagree, go back to the diagram and think about it really hard. (It's like the first time you had to tie two eights in the same peice of rope and all of a sudden it acts like two ropes and your brain said WTF) Tomo has made a very good observation in the posts above,
  6. Yay, an alternative view point! Fight fight fight (just kidding) On a serious note, Everyone who has commented so far seems to treat handrails just like any other (perhaps slightly suspect) anchor point, justifying their use with good inspection techniques and/or the use of anchor load sharing. But to me, 15kn is an important number here. As I understand it, 15kn is minimum force an anchor must withstand before it fails, (That's 1.5 tons!) And that minimum strength only applies when both ropes are backed up to both anchors. This makes me have a bit of doubt...
  7. So the general consensus so far is that it is accepted practice... How it gets done is another story altogether it seems.
  8. Yup, the two badly drawn yellow things are indeed meant to be ASAPs. The actual reason i thought to put the asaps there was so as not to need a backup rope. To try to make it a hauling and lowering system using only one rope to control on the top, but at the same time that if a rope fails on either side of the load anywhere in the system, then the load would be caught by the ASAPs. The ASAPs kinda replace the backup rope. If either anchor on either side of the system, or if the rope or any hardware fail anywhere in the system then the load will still stay suspended, just like as if it ha
  9. In your opinion, can you use this hauling system for rope access?
  10. I'm looking for a few opinions on this one please. Some guys say its a complete no no, never rig from railings, others say yes, railings are fine as long as they are risk assesed correcly. How do you guys feel about it? Do you feel the need to see the interior of the tubing in order to check for corrosion if you are going to use them as anchor points, or do you just look at the state / age of the vessels to determine if they are ok? Does anyone know the loads that typical (?) handrails are designed to support or fail at? Are you comfortable rigging both anchor poi
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