Compressing/pressurizing water

[Chris]

So I was talking with one if my employees today and we are trying to figure out how we test our pipes.

We are testing about 8,000 feet of 10" pipe we just installed, we filled the line with water and blead off the air. Then using my hydrostatic test pump we pumped 2,000 gallons of water into the pipe to get it to 125 psi.

Question is, did the water compress or where did it go? Science says water does not compress. I am stped.

 

[havasu]

It is very simple math. Shall I explain it to you?


Table-B.4, PC Model, H2O: Compressed Liquid Table
SI Units English Units

Compressed Liquid Water (H2O) Table
deg-C m^3/kg kJ/kg kJ/kg kJ/kg K m^3/kg kJ/kg kJ/kg kJ/kg K m^3/kg kJ/kg kJ/kg kJ/kg K
T p = 5 MPa (263.99 C) p =10 MPa (311.06 C) p = 15 MPa (342.24 C)
v u h s v u h s v u h s
sat. 0.0012859 1147.8 1154.2 2.9202 0.0014524 1393.0 1407.6 3.3596 0.0016581 1585.60 1610.5 3.6848
0 0.0009977 0.0 5.0 0.0001 0.0009952 0.1 10.0 0.0002 0.0009928 0.15 15.1 0.0004
20 0.0009995 83.7 88.7 0.2956 0.0009972 83.4 93.3 0.2945 0.0009950 83.06 98.0 0.2934
40 0.0010056 167.0 172.0 0.5705 0.0010034 166.4 176.4 0.5686 0.0010013 165.76 180.8 0.5666
60 0.0010149 250.2 255.3 0.8285 0.0010127 249.4 259.5 0.8258 0.0010105 248.51 263.7 0.8232
80 0.0010268 333.7 338.9 1.0720 0.0010245 332.6 342.8 1.0688 0.0010222 331.48 346.8 1.0656
100 0.001041 417.5 422.7 1.3030 0.0010385 416.1 426.5 1.2992 0.0010361 414.74 430.3 1.2955
120 0.0010576 501.8 507.1 1.5233 0.0010549 500.1 510.6 1.5189 0.0010522 498.40 514.2 1.5145
140 0.0010768 586.8 592.2 1.7343 0.0010737 584.7 595.4 1.7292 0.0010707 582.66 598.7 1.7242
160 0.0010988 672.6 678.1 1.9375 0.0010953 670.1 681.1 1.9317 0.0010918 667.71 684.1 1.9260
180 0.001124 759.6 765.3 2.1341 0.0011199 756.7 767.8 2.1275 0.0011159 753.76 770.5 2.1210
200 0.001153 848.1 853.9 2.3255 0.001148 844.5 856.0 2.3178 0.0011433 841.00 858.2 2.3104
220 0.0011866 938.4 944.4 2.5128 0.0011805 934.1 945.9 2.5039 0.0011748 929.90 947.5 2.4953
240 0.0012264 1031.4 1037.5 2.6979 0.0012187 1026.0 1038.1 2.6872 0.0012114 1020.80 1039.0 2.6771
260 0.0012749 1127.9 1134.3 2.8830 0.0012645 1121.1 1133.7 2.8699 0.0012550 1114.60 1133.4 2.8576
280 0.0013216 1220.9 1234.1 3.0548 0.0013084 1212.50 1232.1 3.0393
300 0.0013972 1328.4 1342.3 3.2469 0.0013770 1316.60 1337.3 3.2260
320 0.0014724 1431.10 1453.2 3.4247
340 0.0016311 1567.50 1591.9 3.6546
T p = 20 MPa (365.81 C) p = 30 Mpa p = 50 MPa
v u h s v u h s v u h s
sat. 0.002036 1785.6 1826.3 4.0139
0 0.0009904 0.2 20.0 0.0004 0.0009856 0.3 29.8 0.0001 0.0009766 0.20 49.0 0.0014
20 0.0009928 82.8 102.6 0.2923 0.0009886 82.2 111.8 0.2899 0.0009804 81.00 130.0 0.2848
40 0.0009992 165.2 185.2 0.5646 0.0009951 164.0 193.9 0.5607 0.0009872 161.86 211.2 0.5527
60 0.0010084 247.7 267.9 0.8206 0.0010042 246.1 276.2 0.8154 0.0009962 242.98 292.8 0.8052
80 0.0010199 330.4 350.8 1.0624 0.0010156 328.3 358.8 1.0561 0.0010073 324.34 374.7 1.0440
100 0.0010337 413.4 434.1 1.2917 0.001029 410.8 441.7 1.2844 0.0010201 405.88 456.9 1.2703
120 0.0010496 496.8 517.8 1.5102 0.0010445 493.6 524.9 1.5018 0.0010348 487.65 539.4 1.4857
140 0.0010678 580.7 602.0 1.7193 0.0010621 576.9 608.8 1.7098 0.0010515 569.77 622.4 1.6915
160 0.0010885 665.4 687.1 1.9204 0.0010821 660.8 693.3 1.9096 0.0010703 652.41 705.9 1.8891
180 0.001112 751.0 773.2 2.1147 0.0011047 745.6 778.7 2.1024 0.0010912 735.69 790.3 2.0794
200 0.0011388 837.7 860.5 2.3031 0.0011302 831.4 865.3 2.2893 0.0011146 819.70 875.5 2.2634
220 0.0011695 925.9 949.3 2.4870 0.001159 918.3 953.1 2.4711 0.0011408 904.70 961.7 2.4419
240 0.0012046 1016.0 1040.0 2.6674 0.001192 1006.9 1042.6 2.6490 0.0011702 990.70 1049.2 2.6158
260 0.0012462 1108.6 1133.5 2.8459 0.0012303 1097.4 1134.3 2.8243 0.0012034 1078.10 1138.2 2.7860
280 0.0012965 1204.7 1230.6 3.0248 0.0012755 1190.7 1229.0 2.9986 0.0012415 1167.20 1229.3 2.9537
300 0.0013596 1306.1 1333.3 3.2071 0.0013307 1287.9 1327.8 3.1741 0.0012860 1258.70 1323.0 3.1200
320 0.0014437 1415.7 1444.6 3.3979 0.0013997 1390.7 1432.7 3.3539 0.0013388 1353.30 1420.2 3.2868
340 0.0015684 1539.7 1571.0 3.6075 0.001492 1501.7 1546.5 3.5426 0.0014032 1452.00 1522.1 3.4557
360 0.0018226 1702.8 1739.3 3.8772 0.0016265 1626.6 1675.4 3.7494 0.0014838 1556.00 1630.2 3.6291
380 0.0018691 1781.4 1837.5 4.0012 0.0015884 1667.20 1746.6 3.8101

 

[Chris]

That explains a lot.

 

[havasu]

I figured that it would. It was my pleasure helping you out.

 

[phishfood]

Either you have a leak, or you didn't get all of the air out, or both.

 

[Chris]

Pretty sure there was air.

 

[speedbump]

Havasu,

Can I use that table on my Website? I'm sure it will help others with their water compression problems.

 

[havasu]

SB,

By all means, but please check the math. At my older age, I believe I placed a decimal point incorrectly in one figure. Remember, it was from my memory, and my math has become a tad fuzzy.

 

[speedbump]

I might have trouble finding that one decimal point seeing as I have to wear contacts to read, and they aren't that great. So maybe we should let Chris check it for us. He has those young eyes.

 

[Chris]

Young and had laser surgery, I'll take a look at the math later.

 

[speedbump]

Great Chris,

While your in there have a close look at this: "T p = 20 MPa (365.81 C) p = 30 Mpa p = 50 MPa
v u h s v u h s v u h s
sat. 0.002036 1785.6 1826.3 4.0139" Something about it just doesn't seem to add up!