13 1/16 [white space between digits becomes a
"+"] or

-20 * log10(4.13) [any php-legal
expression]

Heat capacity of water: @20C @45C [W/gpm-C].
Hydraulic power of water: watt for every 1.00 gpm-psi
1 BHP is watts (shaft horsepower)
1 BHP motor needs watt-elec (@0.9 eff) and pumps
gpm-psi (@0.7 eff)
or
1 gpm-psi uses watt-elec,
watt to air,
watt to water Film Temperature Drop
[5]
Thermal growth dL/L from 0 C,
0<= T<= 1050C
[4]
Aluminum coef of expansion is between 2.1 and 2.5e-5/C near room temperature.
SS-316 is 1.6e-5/C
Thermal growth dL/L from ~ 293.15K (20C), 4<=T<=300K:
(cINC is 718 Inconel). [1]
Wire Sizes:
converts from gauge to diameter in inches (good to about 3 digits). Use
-1 for 00, -3 for 0000.
converts from kcmil to diameter in inches.
10 gauge copper wire is about 0.001 ohm/foot. 1 BTU/h ~= watt.
1 calorie == joule
Helium: 1 g/sec ~= 20.725 watt (heat of
vaporization)
Pressurized gas: 1 ft^{3}-atm ~= 1435 J 9mm bullet (in flight) ~= 540 J 1 g TNT ~= 4600 J
Orifice Plate for gas: airlohms.php Orifice
for liquid: Sto3 = Q
[gpm]; Sto4 = K; Sto5 = P [psi];
[2]
Conversions:
www.onlineconversion.com,
www.convert-me.comwww.engineersedge.com
Inductance: L=m_{0} N^{2} A/l
m_{0}=4p10^{-7}
H/m

h [ft] = 2.31 * P [psi] / s.g.; Q [gpm] = 25 A [in^2] K
h^0.5 Q = 38 A K P^0.5; K is about 0.8 for most orifices.; d [in] = sqrt(Q / (30 K sqrt(P)) http://www.mcnallyinstitute.com/13-html/13-12.htm