1. ## Civil engrineer

Hi all,

Could you please explain this sentences as?:

"The change in elevational difference between two consecutive measurements of elevational difference each measured over 300mm not exceeding 5mm in 95% of measurements and not exceeding 5mm in 95% of measurements and not exceeding 7.5mm in 100% of measurements."

I try to understand in following:

1. There are difference between 2 times measurement.
2. We cannot exceed 5mm in 95% of measurements
3. We cannot exceed 7.5mm in 100% of measurements.

But how about 300mm? What does it mean??

Thanks so much..

2. ## Re: Civil engrineer

Hi, I am not a teacher, but I am an engineer, so maybe I can help.

First, I am almost certain that your sentences repeat one phrase by mistake. I think it should be:

"The change in elevational difference between two consecutive measurements of elevational difference each measured over 300mm not exceeding 5mm in 95% of measurements and not exceeding 7.5mm in 100% of measurements."

The 300mm is how far apart in distance they take the measurements. They measure the elevation at one spot, then move over 300mm and measure the elevation at the new spot. The difference in elevations should be less than 5mm in 95% of the cases and less than 7.5mm in all of the cases.

3. ## Re: Civil engrineer: Free Movement Floor Class 2

Dear luschen,

Thanks so much for you help.

You know that i have think about it this whole day, it is so terrible....and just now, i can understand it..

Would you help me one more sentence ?

" Free Movement Floor Class 2" TR34-FM3

I can understand that is " industrial floor 2 (TR34-FM3)"

Thank you again,

B. Regards,

Suka..

4. ## Re: Civil engrineer

This was one I didn't know so I looked it up:

"Free movement floors refer to areas where materials handling equipment operates in random, non-defined directions and have an infinite number of travel paths. "

So it is a warehouse floor in which lift trucks (also called fork lifts) or other materials handling equipment can operate freely without any obstructions

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