H3-VV6A flender catalogue Helical speed reduction gearboxes H3

Flender/Flender Gear Units/Helical speed reduction gearboxes H3

Control & Instru mentation (&) Chapter-0.0 2, MECON Limited, All Right Reserved Page 3 of 1 From 6 onwards 3 mm Vessels 4 mm Immersion length is based on 2 mm length between flange face and inner wall of pipe. In vessels, where fouling with vessel internals is exp ected, the immersion length shall suitably modified. Any pipe less than 4 nominal ore shall be blown to 4 size. .8 Orifice Plate Concentric orifice plates shall only be provided for other flow measurements where flanged construction and higher pressure losses are acceptable. Orifice plates shall be made of SS3. The standard primary element shall be thin plate , square-edge concentric. Orifice flanges shall be of the raised face weld neck type with dual sets of taps. The minimum pressure rating for flanges shall be ANSI 3 lbs. Thickness of Orifice plate shall be 3.1 mm (minimum) for pipe diameter up 3 mm and 6 mm (minimum) for pipe diameter above 3 mm. Orifice plates shall be supplied with carrier rings as per process requirements. The length of straight pipe run required for metering accuracy shall be in conformity with ISO. When it is extremely difficult to comply with the sta ndard, minimum straight length of 1D ( = pipe inner diameter) on the upper tream and minimum length of 5D on the down-stream shall be considered For pipeline sizes of 5 mm and less, the orifice plates shall be an integral unit comprising of carrier ring asse mbly, tapping arrangement on both upstream as well down stream side. For line sizes more than 5 mm, the orifice late shall be disc type. For disc type orifice plate, suitable corner tapping arra ngement on both upstream as well as downstream side shall be provided. All tapp ing arrangements shall be complete with piece of impulse pipe line and shut off valve suitable for specified line pressure For steam applications, orifice plate shall be supplied with pair of steam condensation chambers suitable for specified line p