NACE MR0175 and ISO 15156 are now one document (as of late 2003 I believe). The subject paragraph (4.2.2) is from the previous NACE MR0175-2003 edition. Basically there was two revisions to MR0175 in 2003.
For steam flow the taps should be on the side and the transmitter mounted below. The lead lines (impulse lines) should be filled with water (condensate). The lead lines should have no high spots where gases can collect and to allow gases liberated to flow back to the process. For long lead lines...
For newtonian fluids Andrade's equation is useful for estimating viscosity at a temperature.
u = AL exp BL/T
From two known values of viscosity constants AL and BL can be determined
BL = (T1 * T2 * ln(u1/u2))/(T2 - T1)
AL = u1/exp (BL/T1)
Where T is absolute temperature
Using the 2 points...