Posted by: automan3042 ® 04/03/2007, 02:38:10 Author Profile eMail author Edit

I am designing a water heater and would like to know how to calculate the pressure within the vessel at a certain temperature?Now pressure valves give some idea of what the pressure is within the vessel, but then, how does one determine the psi rating for a pressure valve? Modified by automan3042 at Tue, Apr 03, 2007, 22:55:46

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Re: Water Heater
Re: Water Heater -- automan3042	Post Reply	Top of thread	Forum

Posted by: mikeweber3 ® 04/09/2007, 13:09:29 Author Profile eMail author Edit

Any time you heat water it expands. It is not even remotly practical to attempt to stop this expansion with pressure. All you need to do is incorporate a system for it. Some possibilities are an air filled expansion tank. a pressure relief valve an atmospheric vent and riser.

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Re: Water Heater
Re: Water Heater -- automan3042	Post Reply	Top of thread	Forum

Posted by: devitg-02 ® 04/03/2007, 21:28:29 Author Profile eMail author Edit

As it is a WATER heater , you NEVER will pass the boiling point , an so the pressure will be the atmospheric pressure. Maybe you will have more that atmospheric pressure , due to the water column height at the tank. All water heaters have a relief valve set to avoid the vessel deformation due a block in the pipes. Maybe you can broad your post and explain a little more what are your's concern.

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Re: Water Heater
Re: Water Heater -- automan3042	Post Reply	Top of thread	Forum

Posted by: jboggs ® 04/03/2007, 09:45:45 Author Profile eMail author Edit

The pressure within the vessel is a function of the setting of the pressure relief valve, not the liquid inside.

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Re: Re: Water Heater
Re: Re: Water Heater -- jboggs	Post Reply	Top of thread	Forum

Posted by: wmlwdp ® 04/04/2007, 16:41:56 Author Profile eMail author Edit

unfolds-> https://wmlwdp.com

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Re: Re: Re: Water Heater
Re: Re: Re: Water Heater -- wmlwdp	Post Reply	Top of thread	Forum

Posted by: jboggs ® 04/05/2007, 19:02:38 Author Profile eMail author Edit

I checked that website and don't understand how it has anything to do with this discussion. You asked how does one determine the pressure rating of the pressure valve? Its pressure rating is labeled or stamped right on it by the manufacturer.

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