Am I making a mistake or is it that my table is not good enough? So, Im told to

Question

Am I making a mistake or is it that my table is not good enough?

So, Im told to find p and u if told that that T = 600 degrees F, v = 0.6 ft^(3)/lb.I already realized that I need to use the superheated vapor tables. Now, the specific volume of 0.6 is between tables p = 800 and p = 1000 psi (as shown below). I tried interpolating as such:

800 0.67799

P 0.6

1000 0.51431

and I got P= 895 psi. However, this is wrong. I noticed that the solution manual uses a sepcific volume from a table at 900 psi. However, the steam table I have doesnt have a table at 900 psi in between the 800 and 1000 psi tables. I cant find another steam table with a table of 900 psi, so I need to know if there is a way of getting the correct pressure (885.6 psi) using the table that I have.

P = 800 psia (518.27°F) P = 1000 psia (544.65°F) Sat. 0.56920 1115.0 1199.3 1.4162 0.44604 1110.1 1192.6 1.3906 550 0.61586 1139.4 1230.5 1.4476 0.45375 1115.2 1199.2 1.3972 600 0.67799 1170.5 1270.9 1.4866 0.51431 1154.1 1249.3 1.4457 650 0.73279 1197.6 1306.0 1.5191 0.56411 1185.1 1289.5 1.4827 700 0.78330 1222.4 1338.4 1.5476 0.60844 1212.4 1325.0 1.5140 750 0.83102 1246.0 1369.1 1.5735 0.64944 1237.6 1357.8 1.5418 800 0.87678 1268.9 1398.7 1.5975 0.68821 1261.7 1389.0 1.5670 900 0.96434 1313.3 1456.0 1.6413 0.76136 1307.7 1448.6 1.6126 1000 1.04841 1357.0 1512.2 1.6812 0.83078 1352.5 1506.2 1.6535 1100 1.13024 1400.7 1568.0 1.7181 0.89783 1396.9 1563.1 1.6911 1200 1.21051 1444.6 1623.8 1.7528 0.96327 1441.4 1619.7 1.7263 1400 1.36797 1534.2 1736.7 1.8170 1.09101 1531.8 1733.7 1.7911 1600 1.52283 1626.5 1851.9 1.8759 1.21610 1624.6 1849.6 1.8504 1800 1.67606 1721.9 1970.0 1.9306 1.33956 1720.3 1968.2 1.9053 2000 1.82823 1820.4 2091.0 1.9819 1.46194 1819.1 2089.6 1.9568

Explanation / Answer

The interpolation value is correct. The steam table used is not correct.

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