1. Home
  2. LEA 2015
  3. Proceedings
  4. Definition of Equivalent Roughness of Internal Surface of a Measuring Pipeline

Definition of Equivalent Roughness of Internal Surface of a Measuring Pipeline

Bohdan Chaban1 b.chaban.91 [at] gmail.com
Leonid Lesovoy2 techinfoflow [at] yahoo.co.uk
  1. Department of Automation of Heat and Chemical Processes, Lviv Polytechnic National University, Ukraine, Lviv, Ustyyanovycha street 5.
  2. Department of Automation of Heat and Chemical Processes, Lviv Polytechnic National University, Ukraine, Lviv, Ustyyanovycha street 5.
Abstract 

Literature on the methods for defining the equivalent roughness of the internal surface of a measuring pipeline was analyzed. The equation for calculating the hydraulic resistance coefficient of friction of natural gas on the internal surface of the measuring pipeline was developed. The equation for calculating the equivalent roughness of the internal surface of the measuring pipeline was obtained. This equation provides improvement of accuracy of  natural gas flow rate and volume measurement by means of the differential pressure method.

Keywords 
equivalent roughness
flow
natural gas
differential pressure method
standard orifice plate
hydraulic resistance coefficient of friction
References 

[1] “Metrolohiya. Vymiryuvannya vytraty ta kilkosti ridyny i hazu iz zastosuvannyam standartnykh zvuzhuvalnykh prystroyiv. Chastyna 1. Pryntsyp metodu vymiryuvan ta zahalni vymohy” [“Metrology. Measurements of liquid and gas flow rate and quantity by means of orifice instruments. Part 1. Principle method of the of measurements general requirements”], DSTU GOST 8.586.1, 2009.

[2] Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full – Part 1: General prin- ciples and requirements. Intemational Standard,  ISO 5167-1, 2003.

[3] “Metrolohiya. Vymiryuvannya vytraty ta kilkosti ridyny i hazu iz zastosuvannyam standartnykh zvuzhuvalnykh prystroyiv. Chastyna 2. Diafrahmy. Tekhnichni vymohy” [“Metrology. Measurements of liquid and gas flow rate and quantity by means of orifice instruments. Part 2. Orifice plates. Technical requirements”], DSTU GOST 8.586.2, 2009.

[4] Measurement of fluid flow with primary devices; orifice plates and nozzles for special applications. VDI 2040, Blat 1, 1971.

[5] L. Lesovoy and L. Blyznyak, "Porivnyalnyi analiz rozpodilu tysku pryrodnoho hazu u pokhylomu ta horyzontalnomu truboprovodi" ["Comparative analysis of the distribution of natural gas pressure in inclined and horizontal pipelines"], Visnyk. Teploenerhetyka. Inzheneriya dovkillya. Avtomatyzaciya – Bulletin. Heat energetics. Environmental engineering. Automation, no.460, pp.56-60, 2002.