Venturis & Orifice Plates
NUCCORP designs flow-measuring and cavitating
venturis, 1” through 3” NPS. These venturis are machined from
solid-forged-rounds of SA-182, F304/316 (other materials available).
Venturis offer the most hydraulically efficient design, as the
non-recoverable pressure losses are much less than standard orifice plates.
Venturis are supplied as safety-related material (no ASME stamping
Cavitating venturis are advantageous for limiting flow to a value which
remains constant, regardless of the downstream pressure. These are used in
AFW and SI systems to limit flow to postulated pipe breaks downstream of the
venturi. When used in AFW systems, these simplify hydraulic analyses and
aids in more favorable results in containment pressure/temperature analyses.
When used in SI systems, high-head pump flow can be limited to that less
than pump run-out, thus protecting ECCS pumps during postulated LOCA
NUCCORP also designs and manufactures standard flow orifices for flow
measurement purposes. Orifice plates are an economical alternative for flow
measuring venturis, when there is no concern of higher non-recoverable
pressure losses. Orifice plates are outside of the ASME code jurisdiction,
and are supplied from ASME-certified SA plate materials (safety-related).