rigger
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Posts posted by rigger
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The other week a bunch of folks from work had a go with several different Inflatable Life jackets - I think there were about 10 Life jackets tested - 4 types, 2 of 275N and 2 of 150N
First one I tried was my old work one - about +10years old and 18months since last serviced - a 275N one
- inflated gently and rolled me onto my back head clear of water, easy to breath, no crotch strap
Second one was a 150N jacket - failed to roll me onto my back, if unconscious I would have drowned. No crotch strap, once on my back the jacket just did not feel as comfortable as the 275N one.
In every case where the wearer was wearing wet weather gear the 150N units failed to roll the wearer onto their back
One of the guys tested a jacket with it fitted loosely - end result was that wearing the jacket loosely meant you would die - the jacket would drown you unless you could make it tighter.
Tried putting a 275N inflated jacket on in the water - easy enough in the pool but would be much harder with a bit of chop.
Points:
- crotch strap made little difference with the 275N jacket as it inflated - in a chop it may well do.
- excess buoyancy in clothing, boots, wet weather gear may turn a 150N life jacket into a death jacket
- falling head first into the water with wet weather gear on increases the risk of you wearing a death jacket
- a poorly fitted inflatable Life jacket = death jacket - well you might as well wear a weight belt.
- lights were fitted incorrectly on nearly every jacket we tested and some had not been armed by the supplier.
- Could not fit the spray hood in the water - need to practice that.
My current jacket is 275N (with crotch strap that I use) but I am looking for a replacement that is easier to adjust as once in the water it is very hard / impossible to adjust.
My 2cents worth....
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Would be close to the max range.
Camera was eye height of the shortest officer on the bridge.
For those that regularly sail in Tauranga harbour the stbd buoys and beacons in the main channel are set 20m outside the channel - straight line between them it gets shallow enough that the tugs will not go there ~5-6m at the last survey.
Tanea 2 and 4 are inside the channel by ~ 10m, but from the buoys to the 5m contour is ~45m at No2 and ~25m at No4 depending upon the current / wind acting on the buoys.
If anyone has questions about the changes to the channels / marks just ask.
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Nope
here are another few - thought on the cruise ships there are cameras
347m S Class
Cruise Ship view
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A recent arrival into Tauranga.
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Hi Willow,
It was great to have the channel clear, I had slowed down as I had been told there was a number of boats in the cut.
Have a camera recording fairly often so might have footage.
Thanks again
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KM - agree it does not sound like Jim.
Any comments on the pics below?
The pic was taken after the ship took action.
There was another small boat that cannot be seen.
The yachts racing on Saturday were fantastic at keeping clear - Thanks!!
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It directs you to the location of where the incident happened - not to where the tag is now.
Has a 50ft range - bluetooth.
If you search for key trackers you will find a bunch of similar devices, some with a greater range.
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tracker
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Hi Wheels - 400ft long ship - try 1138ft long - that is the longest vessel type currently calling in NZ waters.
The longest container ship is around 400m - 1312ft.
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Area near where yacht was I think.
Beacons are outside the channel by ~20m.
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LINZ from what I understand - though the local HM would likely order a survey.
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or try something like http://www.supercheapauto.co.nz/Product/ToolPro-Utility-Oil-Pump-1-Litre/384856
Avoids holes in the deck and / or funnels.
For small quantity topups I use an 80-100ml syringe.
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Local weather conditions can play a big part in actual recorded tide levels. Global warming probably does play a part but probably a lot less than most people think.Tidal predictions for Auckland have remained pretty constant at around 12ft (3.6m) over the the last fifty years but in recent years we have seen predicted 3.6m tides go as high as 3.85 due to local weather, however large tides are nothing new. The 1930's saw a tide go over 13ft (4.00m). Two roads that are most susceptible to flooding, Tamaki Drive and the Northwestern motorway between Waterview and Patiki Rd both suffered the same problem and that was the roads sinking into the mudflats both roads have dropped around on metre since built. The Councils are also allowing people to built in flood prone areas so these flooding problems are becoming more prevalent.
for what it is worth
1936 - 3.99m - 13ft 1&3/32"
2011 - 4.12m - there was a deep depression coinciding with a spring tide
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Here is a bit of text from one report
Sea level has risen at a long-term rate of 1.5mm/yr at Auckland relative to the land.
relative to the land....
Looking at that have they looked at the level of mean land level - in other words has the land risen or fallen relative to a vertical datum other than MSL?
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On the 5nm off the coast - there is a voluntary code for vessels with oil or other harmful liquid cargo - 5nm - till alteration to make port is required.
If you have a plotter showing you out of position check what datum it is on and what datum the electronic charts are in. Also check if some fiddler has put in a manual offset. Also check how many sats the thing is picking up - in some places in the sounds I have found the sat numbers below 4. another point WAAS - designed for North America - apparently it can lead to position error in other places.
IMPORTANT!!! check your smoothing function - recently I found a GPS that had no error when stationary but 200m at 10-12knots - the position was being smoothed / averaged thus was not real time. Most GPS unit will smooth the speed but it appears now that some do it to the position with out taking the vessel speed into account!!!
On electronic charts - they need to be updated - unfortunately there can be years between updates by some suppliers - not to mention several hundred dollars for every update in some cases.
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Thanks Rigger, so if built that long ago probably some serious corrosion issues as well.
cheers
fatigue could be considered as well water ingress
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Yep, there are ultrasonic logs. But they are not accurate enough for decent calculations of wind and current angles at this time. Even the really high spec race boats are still using paddle wheels at this stage, even when budget is not an issue.
Have you looked at janus config log transducers?
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Why did it break in half, incorrectly ballasted perhaps? I noticed they said at the end no environmental issues. Is that because as John Clarke famously said it was outside the environment.?
That was in a skit about a ship off the coast of Australia whose "bow fell off"!!!
Cheers Tb
Vessel was in ballast being towed to china to get a new fore body fitted to the aft section - probably very little oils onboard.
Vessel was built for service on the great lakes in 1978, sank in 2009 - that is old for a bulk carrier.
A bulk carrier in ballast under tow in heavy seas.... the vessel had be aground in the past - was due to get the fore section replaced - fatigue, water ingress and so on.
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Thanks Rigger
What does one use to cut 64mm wire rope in an emergency?
There are hydraulic cutters, but never had them only had gas gear or cut off discs on a big angle grinder - hence my preferred option of paying out the wire, after all if you have a 1200m wire and you cut off 400m you will most likely change it out so why risk people to save a bit of wire.
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OK - towing on a bridle with fish / delta plate then pennant to towline.
Situation: Not an emergency
- Heave in the towline and lock the pennant eye in the forks / sharkjaw / pelicanhook, undo the shackle from towline to pennant, release the pennant.
Situation: OH F$%^
- On the old dutch tug we could just dump the brake and the wire would run out.
Worked on a couple of boats where the winch was secured on a dog - meaning you had to heave up to remove the dog then you could dump the gear.
- If you could control the position of the wire - you could take the chance the pennant / stretcher would fail before something else - if the gog wire failed first you would be wishing you did something else..... did have a 16inch (I think - could have been bigger) rope snap once.
- Always had cutting gear to hand.
But...
We had a spare tow wire on most of the boats. So my attitude was that we had a spare wire but no spare crew or boat to hand - in emergency dump the wire.
In NZ the MNZ rules require the towline to be the weakest line in the the towing arrangement....
An example of gear in an arrangement,
Ships Bitts / Panama - 64tonne SWL
Tug Tow line - 300t MBL
Tug Bitts - 100t SWL
Winch brake render load - 180tonnes
On who pays for it, depends upon the contract and how you lost it.
KM can give you an idea of cost - how much for 1250m of 64mm wire rope
A setup for a harbour tug (just the mainline) - maybe 50k for one with +60tonne Bollard Pull but depends on a few factors.
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I agree for flat surfaces. But what about this?
Yeap - did use one on doors a bit like those, had to adjust the gates
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Have said it before - Resene did hire them - I-strip speed heater.
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Nearest Navtex transmitter is in Asia - there are no stations in NZ or Aus.
You need to be in range of a transmitter - say 500nm or less.
So unless you are going to be traveling to part of the world that has Navtex I would not bother with the gear, and even then....
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you missed one that has been out for years - AIS & DSC VHF in one.
http://www.mrtsos.com/products/personal-locator-beacons/smrt-v100
406mhz is the sat freq - have a read here http://www.mrtsos.com/plbs-explained/what-is-a-personal-locator-beacon-plb
AIS is not restricted to commercial vessels, Many ports operate ais receivers, not to mention about 80-90% of the coast is covered.
Another ridiculous lifejacket article
in MarineTalk
Posted
Sabre - when you say maneuverability how are you trying to swim? On your back or front?