How can I choose the most suitable pressure taps for my application?
The 1''/1'' pressure taps (1 inch is the distance between the pressure tap and orifice plate) or the flange pressure tap are often used for diameters up to DN300 . Indeed, it is necessary to mount the orifice plate between orifice flanges which are often more expensive than simple flanges. This price gap increases with the diameter of the flanges, so we will tend to limit their use.
1''/1'' pressure taps are also available as a monoblock version. In this case, the assembly is more economical.
The D - D/2 pressure taps correspond to a high pressure tap located at 1D upstream of the plate and a low pressure tap located at 1/2D downstream of the plate. This type of pressure tap is used for large diameters often beyond DN150 (6 ''). The bosses for the pressure taps are made directly on the pipework, which makes it possible to use simple flat flanges for the mounting of the measuring element and to save money.
The long radius nozzle will always be used with D-D/2 pressure taps.
0/0 pressure taps or pressure taps in the corners allow:
- either in monoblock version 0/0, to have integrated pressure taps and to be able to use simple flanges for mounting the measuring element (or directly to weld it on the pipework for the monoblock version to be welded)
- either in annular chamber version, to mount the element between single flanges
In any case, it is necessary to refer to the product data sheet which stipulates the types of pressure taps authorized for each product.