Liquid and gas measurement systems
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Instrument pipeline with the restrictive flow orifice (ITSU)

LLC "EMC TRIADA"

About product
ITSU is intended for metering flow and amount of the operating fluid by alternating pressure drop with the use of the restrictive flow orifice.
 
The restrictive flow orifice (RFO) is a technical device installed in the instrument pipeline with the through bore to create fluid pressure drop by the pipeline section area decrease (flow restriction). 
 
Our company manufactures ITSU based on RFO of orifice type according to DSTU GOST 8.586.1 2,5:2009 (ISO 5167 1,2:2003).
 
ITSU consists of orifice, mating flanges for connection with pipeline, inlet and outlet straight runs of instrument pipeline (IP), averaging chambers with pulse tubes. 
 
Gaskets provide connections air-tightness.
 
The restrictive flow orifice can be manufactured either solid or split Depending on IP diameter before and after it. It is possible to manufacture IP either welded or with flanges for diameters from 50 to 500 mm and pressures up to 32 MPa.
 
IP can be also equipped with straightening vanes, which are manufactured according to DSTU GOST 8.586.1:2009 (ISO 5167-1:2003). The straightening vanes are needed for stabilization of the measured fluid flow to reduce the length of straight runs of instrument pipeline before the orifice. IP can be supplied either equipped or not equipped with RFO. Unequipped IP are good to outfit fluid flow and quantity meters which have counters, because counters also need maintaining the corresponding straight runs for more accurate and reliable metering.
 
Each ITSU is equipped with documents on metrology, issued by the territorial authorities of the State metrological service of Ukraine:
  • averaging chambers geometrical dimensions inspection report,
  • orifice certificate, 
  • instrument pipeline geometrical dimensions inspection report,
  • instrument pipeline inside steps inspection report (if IP consists of a few parts),
  • straightening vanes geometrical parameters inspection report (if available); 
  • calculation report of the flow meter with restrictive flow orifice in approved by the territorial authorities of the State metrological service of Ukraine, 
  • certificates for the used materials (by request), 
  • documents about the X-ray examination of welded joints (by request).
Calculation of IP dimensions, averaging chambers and orifice is made by the specialized program “SAPR “Raskhod-RU” certified by “Ukrmetrteststandard” state company.

List of ITSU


ITSU designation Nominal diameter DN, mm Nominal pressure PN, MPa Instrument pipeline length before and after orifice, mm Instrument pipeline material
ITSU-0,6-50 50 0,6
minimum 10.5 DN
and minimum 4.5 DN
Steel 20
GOST 1050-88
ITSU-0,6-65 65 0,6
ITSU-0,6-80 80 0,6
ITSU-0,6-100 100 0,6
ITSU-0,6-125 125 0,6
ITSU-0,6-150 150 0,6
ITSU-0,6-175 175 0,6
ITSU-0,6-225 225 0,6
ITSU-0,6-250 250 0,6
ITSU-0,6-300 300 0,6
ITSU-0,6-350 350 0,6
ITSU-0,6-400 400 0,6
ITSU-0,6-450 450 0,6
ITSU-0,6-500 500 0,6
ITSU-1,0-50 50 1,0
ITSU-1,0-65 65 1,0
ITSU-1,0-80 80 1,0
ITSU-1,0-100 100 1,0
ITSU-1,0-125 125 1,0
ITSU-1,0-150 150 1,0
ITSU-1,0-175 175 1,0
ITSU-1,0-225 225 1,0
ITSU-1,0-250 250 1,0
ITSU-1,0-300 300 1,0
ITSU-1,0-350 350 1,0
ITSU-1,0-400 400 1,0
ITSU-1,0-450 450 1,0
ITSU-1,0-500 500 1,0
ITSU-1,6-50 50 1,6
ITSU-1,6-65 65 1,6
ITSU-1,6-80 80 1,6
ITSU-1,6-100 100 1,6
ITSU-1,6-125 125 1,6
ITSU-1,6-150 150 1,6
ITSU-1,6-175 175 1,6
ITSU-1,6-225 225 1,6
ITSU-1,6-250 250 1,6
ITSU-1,6-300 300 1,6
ITSU-1,6-350 350 1,6
ITSU-1,6-400 400 1,6
ITSU-1,6-450 450 1,6
ITSU-1,6-500 500 1,6
ITSU-6,3-50 50 6,3
ITSU-6,3-65 65 6,3
ITSU-6,3-80 80 6,3
ITSU-6,3-100 100 6,3
ITSU-6,3-125 125 6,3
ITSU-6,3-150 150 6,3
ITSU-6,3-175 175 6,3
ITSU-6,3-225 225 6,3
ITSU-6,3-250 250 6,3
ITSU-6,3-300 300 6,3
ITSU-6,3-350 350 6,3
ITSU-6,3-400 400 6,3
ITSU-6,3-450 450 6,3
ITSU-6,3-500 500 6,3
ITSU-10,0-50 50 10,0
ITSU-10,0-65 65 10,0
ITSU-10,0-80 80 10,0
ITSU-10,0-100 100 10,0
ITSU-10,0-125 125 10,0
ITSU-10,0-150 150 10,0
ITSU-10,0-175 175 10,0
ITSU-10,0-225 225 10,0
ITSU-10,0-250 250 10,0
ITSU-10,0-300 300 10,0
ITSU-10,0-350 350 10,0
ITSU-10,0-400 400 10,0
ITSU-10,0-450 450 10,0
ITSU-10,0-500 500 10,0