Pressure Reduction
Description
(Single and Multistage Restriction Orifice)
These devices are designed to reduce the fluid pressure. The table here below summarizes typical applications and calculation criteria.
Accuracy (referred to the pressure drop): +/- 2% up to 1 1⁄2” ; +/- 1% for 2” and above)
Gas Service: multistage calculation is performed to avoid to have sound velocity in the vena
contracta section of each stage
Liquid Service: multistage calculation shall be carried out to avoid cavitation
All material requested by the customer / Material Specifications: all Main Material Reference: STM-ASME Code
Single Stage Restriction (refer to pipe taps configuration in-ISO 5167 and in Miller Engineering Handbook) Critical Restriction (typically sized according to Miller Engineering Handbook) Multistage Restriction (sized according to TM Tecnomatic certified calculation)
Type of Multistage Construction:
With body by bar stock
With body from pipe
Calibration
Performances
Accuracy (referred to the pressure drop): +/- 2% up to 1 1⁄2”; +/- 1% for 2” and above Gas Service: multistage calculation is performed to avoid to have sound velocity in the vena contracta section of each stage Liquid Service: multistage calculation shall be carried out to avoid cavitation.
Notes
Multistage restriction orifices are widely used for very high-pressure reduction when a single-stage RO is not capable. It consists of a number of single-stage RO devices. The design can be single-hole or multi-hole.