Abstract Structure for use in a differential pressure sensor system for relatively noise-free measurement of fluid flow. A streamlined nozzle device usable in a pipe line as an element of, and compatible with accepted forms of, flow measurement sensor systems. Such a nozzle form readily insertable in an existing flow measurement sensor system to reduce noise by substituting a streamlined nozzle form for an existing downstream turbulence creating form such as an orifice plate. A flow measurement device in nozzle from with the throat of the nozzle form pressure tapped to a channel in the outer periphery of the nozzle form throat, this channel essentially closable by the inner wall of the pipe line to provide a pressure chamber which may be in the nature of a piezometer ring communicating with the downstream pressure tap of a flow sensor system compatible with accepted practice. A flow sensor nozzle differential pressure system with up and downstream pipe line pressure taps, the latter communicating with pressure taps in the throat of the nozzle, and a piezometer ring about the nozzle throat and defined in part by the inner wall of the pipe line at the downstream tap.
A low noise flow measurement device comprising: an upstream pipe end and a downstream pipe end in end to end alignment; a pressure tap hole through the wall of said upstream pipe end; a pressure tap hole through the wall of said downstream pipe end; said upstream and downstream pressure tap holes being located for suitable flow measurement use with an orifice plate when such plate is located between said pipe ends; a flow nozzle in said downstream pipe; said flow nozzle having a peripheral mounting flange on its upstream end in a plane between said pipe ends, in likeness to the mounting flange and assembly of an orifice plate between such pipe ends; said flow nozzle having an outer peripheral channel which, with the adjacent inner wall of said downstream pipe end, forms a piezometer ring about said downstream pipe end at a location which includes the location of said pressure tap hole in said downstream pipe, whereby said downstReam pressure tap hole and said peizometer ring are connected; a group of peripherally spaced throat taps in said flow nozzle, all of which connect the interior of said flow nozzle with said piezometer ring and therefore with said downstream pressure tap hole; an upstream coupling flange mounted on said upstream pipe end; a pressure tap passage through said upstream coupling flange and connected to the interior of said upstream pipe end through said upstream pressure tap hole; a downstream coupling flange mounted on said downstream pipe end; a pressure tap passage through said downstream coupling flange and connected to the interior of said flow nozzle through said downstream pipe end pressure tap hole, said piezometer ring, and said flow nozzle throat taps; and means for securing said coupling flanges together, with said flow nozzle flange held between said coupling flanges.
Claim 2
Dependent Claim
301 words
A low noise flow measurement device comprising: an upstream pipe end and a downstream pipe end in end to end alignment; a pressure tap hole through the wall of said upstream pipe end; a pressure tap hole through the wall of said downstream pipe end; said upstream and downstream pressure tap holes being located for suitable flow measurement use with an orifice plate when such plate is located between said pipe ends; a flow nozzle in said downstream pipe; said flow nozzle having a peripheral mounting flange on its upstream end in a plane between said pipe ends, in likeness to the mounting flange and assembly of an orifice plate between such pipe ends; said flow nozzle having an outer peripheral channel which, with the adjacent inner wall of said downstream pipe end, forms a piezometer ring about said downstream pipe end at a location which includes the location of said pressure tap hole in said downstream pipe, whereby said downstReam pressure tap hole and said peizometer ring are connected; a group of peripherally spaced throat taps in said flow nozzle, all of which connect the interior of said flow nozzle with said piezometer ring and therefore with said downstream pressure tap hole; an upstream coupling flange mounted on said upstream pipe end; a pressure tap passage through said upstream coupling flange and connected to the interior of said upstream pipe end through said upstream pressure tap hole; a downstream coupling flange mounted on said downstream pipe end; a pressure tap passage through said downstream coupling flange and connected to the interior of said flow nozzle through said downstream pipe end pressure tap hole, said piezometer ring, and said flow nozzle throat taps; and means for securing said coupling flanges together, with said flow nozzle flange held between said coupling flanges.