119 replies to this topic

[mr_quag]

Skier, on Dec 23 2008, 09:48 PM, said:

The force of the ice expansion and the subsequent rupture has been estimated at 800 tonnes of pressure.

Why does W-B keep quoting this? Tonnes isn't really a unit of pressure - it's a unit of force.

Not a big deal, but it does bug me slightly.

jeff

[Aussierob]

Excalibur will open today.

http://www.whistlerblackcomb.com/media/new...09/081223_2.htm

[2milehi]

Aussierob, on Dec 24 2008, 06:04 AM, said:

Excalibur will open today.

http://www.whistlerblackcomb.com/media/new...09/081223_2.htm

STRONG WORK to all lift maintenance at W-B!

[vonrollskyway1]

2milehi, on Dec 24 2008, 09:55 AM, said:

STRONG WORK to all lift maintenance at W-B!

i half to agree.great work guys at w-b!!!

[lastchair_44]

Indeed, nice work guys!

[Emax]

mr_quag, on Dec 23 2008, 11:44 PM, said:

Why does W-B keep quoting this? Tonnes isn't really a unit of pressure - it's a unit of force.

Not a big deal, but it does bug me slightly.

jeff

How true. You'd think the Canucks would get this right.

1 tonne = 1000 kg = 2,204.6 lb

1psi = 6894.757 Pascal (newton/square meter)

[Aussierob]

So if we want to be really pedantic, tonnes are actually a unit of mass, not force or pressure. Tonnes are frequently used because people can visualise the concept much more easily.

800t x 1000 x 9.81 = 7848 kN of force was applied to the connection plate. The diameter of the tower tube is 766 mm = .766m

Therefore pi x .383 x .383 = .4608 square metres and P= f/a = 7848000/.4608 = 17031250 Pascals of pressure or 17031250/6894.797 = 2470psi

Now my brain hurts.

[TRosenbaum]

The damaged part of the Excalibur gondola that was temporarily closed for repairs did indeed open today 12/24/2008. I had an uneventful ride up the reopened lift this afternoon.

[mr_quag]

Aussierob, on Dec 24 2008, 01:33 PM, said:

So if we want to be really pedantic, tonnes are actually a unit of mass, not force or pressure.

OOPS! That's really embarrassing on my part. I sometimes forget that tons are a unit of force but tonnes are a unit of mass.

Jeff

[aug]

mr_quag, on Dec 25 2008, 10:46 PM, said:

OOPS! That's really embarrassing on my part. I sometimes forget that tons are a unit of force but tonnes are a unit of mass.

Jeff

oops again.... ton(sae) or tonne (metric ton) are units of WEIGHT.

[Aussierob]

Okay,
I stand corrected. Tonnes are units of weight, but essentially the same as mass in a fixed gravity envrionment. http://en.wikipedia....s_versus_weight

[2milehi]

Aussierob, on Dec 28 2008, 07:49 PM, said:

Okay,
I stand corrected. Tonnes are units of weight, but essentially the same as mass in a fixed gravity envrionment. http://en.wikipedia....s_versus_weight

If a tonne is equal to 1000 kg, then a tonne is a measurement of mass.

[aug]

Mass and Weight
The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else. All mechanical quantities can be defined in terms of mass, length, and time. The usual symbol for mass is m and its SI unit is the kilogram. While the mass is normally considered to be an unchanging property of an object, at speeds approaching the speed of light one must consider the increase in the relativistic mass.

The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. Density is mass/volume.

for example ...If an object has 1 kg. of mass on the earth, it would have a mass of 1kg on the moon even though it would weigh 1/6 as much.
So since we are trying to figure out how much force was applied to the inside of the tower tube. Newtons would be the Ideal unit of measurement.


Now that we are way Great job W-B for getting your lift back in service during the x-mas season.

This post has been edited by aug: 29 December 2008 - 07:40 AM

[Aussierob]

Yeah, the boys did a pretty awesome job. I wasn't involved, but a number of guys piled on the OT to get the job done.

[2milehi]

Aussierob - was it determined how so much water entered a sealed tower tube?

[Aussierob]

I haven't heard the official cause yet.

[ski89]

I believe the lower section of the tower was filled with concrete and the water was above that. The freezing water had initially affected the alignment of the assemblies and adjustments were made immediatetly prior to the failure without realizing the cause. I'm, going to drill holes in the bottom of mine and inspect annually. I'll put a rubber stopper in it also.

[brad82]

ski89, on Jan 5 2009, 03:19 PM, said:

I believe the lower section of the tower was filled with concrete and the water was above that. The freezing water had initially affected the alignment of the assemblies and adjustments were made immediatetly prior to the failure without realizing the cause. I'm, going to drill holes in the bottom of mine and inspect annually. I'll put a rubber stopper in it also.

Could that not damage the towers structural integrity and make it more prone to rusting ?


And just a general question : When the lift is handed over by the building crew, are the maintenace teams not told which towers contain concrete ?

This post has been edited by brad82: 06 January 2009 - 01:02 PM

[Andoman]

brad82, on Jan 6 2009, 05:01 PM, said:

Could that not damage the towers structural integrity and make it more prone to rusting ?


And just a general question : When the lift is handed over by the building crew, are the maintenace teams not told which towers contain concrete ?

with older concrete mixes this would have been a issue, but with newer mixes and new concrete additives this shouldn't be as much of a problem. They could also coat the inside of the pole with epoxy to stop the contact between the metal and concrete if they really wanted to.

[Aussierob]

brad82, on Jan 6 2009, 01:01 PM, said:

Could that not damage the towers structural integrity and make it more prone to rusting ?


And just a general question : When the lift is handed over by the building crew, are the maintenace teams not told which towers contain concrete ?

Yes, Thats why towers don't usually have a hole in them in the first place.

I guess they would, but you will find out pretty quickly which towers have concrete during summer maintenance.