Principle
EMCO Classical venturi tubes ใช้องค์ประกอบในการวัดอัตราการไหลของไอน้ำ ของเหลว และ ก๊าซ โดยใช้หลักการ Differential pressure
Construction
Design Standards : ISO 5167-4, ASME MFC-3M
Sizes : DN 200 – 1200 according to ISO 5167
Bore/diameter (b) : 0,4 £ ߣ 0,7(ISO 5167), 0,3 £ ߣ 0,75 (ASME)
Pressure rating : PN 10 -100, 150 – 600 lbs, ISO PN 20 – 100
Material : Carbon steel, AISI 316, others on request
Mounting style : Weld ends according to DIN 2559 or ANSI B16.25.
Flanges acc. to DIN or ANSI B16.5 standards or Clamp connections, like Graylock
Pressure taps : Weld ends Ø 21.3 mm, 26.9 mm, thread connection 3/8″, 1/2″ BSP male, 1/2″ NPT
Tappings : Single pressure tappings or 2×4 tappings each arranged with an external annular ring to equalise the pressure.
Outlet cone : 7 — 15°
Technical Data
Accuracy : 1,5 % (according to ISO 5167-4)
Pressure loss : Depending on outlet cone between 10 – 15 % of the differential pressure measured
Limits for Re. No. : 2 x 10 5 < ReD < 2 x 10 6 according to ASME
Accessories : Shut‑off valves and condensing chambers for steam flow.
