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I guess than I have to check in "Systems" volume! Thanks a lot!

Thank you ChrisConley. Unfortunately the ASHRAE Handbook Fundamentals has not Degree-Days information.

Does sombody knows where can I get information on average heating degree-days for the (major) cities in Canada? The base temp should be 18C (65F). Thanks.

Dysung, Your calculation is right. Allow me a small correction: k-factor for large drop sprinklers is 11.2. Deciding on what type of sprinkler you would use depend on, beside the piling method and pile height, some other factors as type of structure, obstructions, arrangement of different...

First you have to find out piling method and piling height. Based on these information, you define whether you will be using Standard Spray, Large Drop or ESFR sprinklers. Then just follow appropriate table to define density and area of application. Multiply coverage area per sprinkler, density...

Thanks to all of you that replayed. This is realy great way to exchange knowledge. Thanks again.

So, as "deanc" said, there is not just health problem, rather there is weld quality problem, too? Am I right?

Does anybody knows what is the reason that if you have galvanized pipe, you have to have galvanize free end for welding? Is it a quality of weld or it is cancer gasses that are released while welding?