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Boiling Water by Bill Corey Pentair Water Training Institute So boiling water means changing it from a liquid to a vapor. I like to talk about “My Cousin Vinny”. It is a very funny movie about two boys who leave New York City and head to Florida for spring break. As they pass through Alabama, they stop at a store called Sac-O-Suds. Vinny’s cousin collects food in his arms to the point he can’t hold it all, so he puts a can of tuna in his pocket, then goes to the checkout, and pays for everything except the tuna. They continue on their way and are soon pulled over by the local police. Wondering why, he reaches into his pocket for his license and finds the can of tuna. To his companion, he says, “I stole a can of tuna. What do you think they do to you for that down here?” He admitted to the crime, and then found out they were looking for a murderer. Of course, he had just admitted to it. The first witness under oath says, “I saw those two boys go into the Sac-O-Suds, then I went over and made my grits, and came back five minutes later, and saw them two running out of the Sac-O-Suds.” Vinny comes to his rescue and asks the first witness under oath, “Did you use instant grits?” to which the witness answered “Why, no respectable Southerner would use instant grits.” Vinny then said, “So what were they, Magic Grits? How is it your grits cooked in five minutes when everybody else in the grit cooking world takes 15 minutes to get the water hot?” The witness had to admit he was away from the window for more than five minutes. What do we learn from this little movie snippet? It takes about 15 to 20 minutes to boil water. This is what happens when you put a pot of water on a gas stove. After about eight minutes, vapor bubbles start to appear on the bottom of the pot. What happens to them when they break loose? It looks like Illustration #1 . Most folks will say, “They float to the surface.” I then ask if they’re sure, to which they begin to get a little concerned about their answer. Then I say I will give them a little hint, and show them the next slide that looks like Illustration #2 . When the hot bubble hits the colder water it implodes, not explodes. And imploding bubbles give off more energy that will cause damage to a solid item. Then I tell them, once the water gets hot all the way through, the vapor bubbles go to the surface and explode. I clap my hands together and show imploding bubbles make a lot of noise and will cause damage to a solid item, like an impeller. I tell them to prove it to themselves; go home, set a teakettle on a gas stove, then listen and watch. What will happen? In about eight minutes, you will hear the teakettle get noisy, and if you look at it, it will start to rock. This is not the end, but the beginning of the experiment. Keep listening and watching and you will hear the noise go away, and the rocking will stop. Now you can amaze all your friends by telling them, “It’s going to boil now.” Of course, I continue and say, “Okay, so you won’t amaze your friends, but that is what will happen.” Remember, there are two ways to boil water; raise the temperature of the water to the vapor pressure point of the water, or lower the vapor pressure over the water to the vapor pressure point of the water. In pump language, boiling is called cavitation. Next, we’ll talk about submarines. Bill Bill Corey may be contacted via e-mail to michele@ worldwidedrillingresource.com Illustration #1 Illustration #2 +9 &8 ,&6"4/23 *,'*&,% "4&2 &,, /.6&.4*/.", ".% &6&23& *2$5,"4*/. 2*,, *0& 15*0-&.4 +9 &8 ,&6"4/23 2& 3&% /2,%7*%& ! 2&8 2&8-$'"%%&. $/- ,&6"4/23 /"% 4&34 $&24*'*$"4&3 "6"*,"#,& * $ "% * $ ( # * $ "% * " # % ! ! $% " ! ! # " ' $ # ) " ! ) " "# ) % # ) ! "# & )"6& &,&6"4/23 /' ",, 3*:&3 490&3 ".% 7&*()43 ".% $". #5*,% 4/ ".9 30&$*", "00,*$"4*/.3 ) ' & # ) $ ( "# ) $" % % !# ) " ## & " % # ) $# ) ' # &7 3&% 15*0-&.4 6"*,"#,& 777 2&8-$'"%%&. $/- 8 JUNE 2016 WorldWide Drilling Resource ® WWDR ’s August issue is in the works! Advertise your products and services to thousands of drilling professionals! Call (850) 547-0102 DEADLINES: Space Reservation - JUNE 25 th Display & Classified Ad Copy - JULY 11 st