Restriction Orifices and Multistages

Restriction devices are designed primarily for gas pressure reduction (let-down) operations, either as part of continuous process or for periodic and/or intermittent pressure relief "blow down" operations (e.g. venting pressurised gas storage vessel tanks).
If the pressure reduction is to be part of a continuous process, and the required pressure drop is too high for a single orifice plate, a special spool piece fitting can be used, incorporating several orifice plates, each at a prescribed distance from the next.

Key Characteristics

• Proven Technology
• Prevent Critical Flow and Cavitation issues
• Reduce Site Restriction and Noise Level

Standards

• R.W. Miller
• FMC Standard Design
• ASME B31.3