"Roger Shoaf" wrote in message
...

"Rick" wrote in message
hlink.net...


From the steam tables, 20 psia is 227.96 degrees

220 deg is 17.186 psia
230 deg is 20.779 psia

Note these are absolute pressures...



Does absolute pressure mean that gage pressure is in addition to
atmospheric
pressure?
^^^^^^^^^^^^^
Yes
^^^^^^^^^^^^
In other words when 5 PSI was indicated on a the pressure vessel gage then
water boiling inside would be about 230F?
^^^^^^^^^^^^^^^
No. 230 degrees occurs at 20.8 psia, which is 6.1 psig. (not 5 psig.)