Method for fabricating an orifice fitting for a gas pressure differential-measuring system
AssigneeMcJunkin Corporation
InventorsAdam F. Gall, Howard P. McJunkin, Jr.
Life of this patent
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Abstract
An orifice fitting for a gas pressure differential-measuring system is constructed of a fabricated body. In the fabrication, two lengths of flared or flanged pipe are inserted through the internal bores of respective orifice blocks and circumferentially welded on the outside. A U-member, which may be assembled of three straight pieces, is welded between the two blocks joining them and leaving a slot at the top. An orifice holder dependingly secured to a cover is provided with an orifice plate rimmed within a gasket and inserted through the slot. The cover is removably, sealingly mounted on the body. The outer face of the upstream face of the gasket is radially notched to equalize pressure in the orifice chamber.
Claims3
A method for constructing an orifice fitting for a gas pressure differential-measuring system, comprising:
- (a) providing two block members each with an inner face and a throughbore extending through that face;
- (b) providing two lengths of pipe, each flared at the inner end thereof to define a radially outwardly projecting circumferential flange;
- (c) inserting each pipe into a respective throughbore through the inner face of the respective block member, with an outer end portion of that pipe protruding from the opposite end of the respective throughbore to provide a pipe stub extending from the respective block;
- (d) circumferentially welding each pipe stub to the respective block where that pipe stub emerges from the respective throughbore, thus providing two orifice block assemblies;
- (e) providing a U-shaped spacer having two legs and a bridge, presenting the two orifice block assemblies, inner faces inwards, in sandwiching relation to the U-shaped spacer and welding about the external periphery of the U-shaped spacer, between the U-shaped spacer and both said blocks to form a unitary body having a laterally opening slot through one side, between the legs of the U-shaped spacer and in communication with the inner ends of both of said pipes;
- (f) machining said side of said body to provide for the mounting and sealing of an orifice holder assembly thereto;
- and
- (g) forming a pressure tap through each said orifice block assembly and the respective pipe stub wall adjacent said slot.
Dependencies are inferred from the claim text.