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If you know the physical and chemical characteristics, you can determine the flow rate through a pipe. We manufacture the products that are required for these procedures.
A Flange is usually a ring type device with bolts to connect two ring type devices together to make a joint in pipe.
Orifice Flanges are used with a plate that contains a restriction, used to measure the upstream and downstream pressures necessary to measure the flow through a pipe.
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Types of Flanges
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There are four different types of flanges used for Flow Management.
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Weld Neck Flange
This Flange has a tapered hub, and a bevel, so you can use it to get 100% joint efficiency, and you can X-ray it.
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Slip On Flange
This Flange slides on over the O.D. of the pipe, and then is welded on the I.D. at the raised face of the flange, then it is welded at the O.D. of the flange.
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Socket Weld
This Flange is a cross between the Slip-on and the Weld Neck Flange. The pipe goes into the I.D. of the Flange, matches the I.D. of the pipe, the weld is made at the back of the hub.
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Threaded Flange
Designed to thread to the pipe. Sometimes they are also welded.
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Flange Products
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Flange Tap
Orifice Flange
Normally this Flange has a 1/2” MPT tap, located 1” from the orifice plates. The tap goes straight through the Flange and comes out in a pre-determined location on the I.D. of the pipe.
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Corner Tap
Orifice Flange
The tap here is in the flange. It does not have to be 1” from the face of the flange. It measures the pressure at the face of the plate instead of 1” back from the face.
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Restriction Plate
Holding Flange
This Flange does not have a tap normally. But does have Jack screws and an orifice plate. It is used to restrict flow, rather than measure it.
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Orifice Plate
Holding Blocks
This system consists of separate rings. Each element will have bolt holes that match the O.D. and I.D. of the pipe, and they have a pressure tap in the block. They are used in a pipeline where the orifice flange would be exceedingly expensive - as in nickel or Monel Hastalloy, or as used in a corrosive line service, where you have plastic lined pipe. Since you cannot weld the pipe to the flange, because of the plastic, we use inserts.
The arrangement is: a Flange Holding Block - an Orifice Plate - another Holding Block - and a Flange, all bolted together. The flanges hold everything together, and the Holding Block has the pressure tap in it.
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Orifice Plate Products
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Series 500
Universal Orifice Plate
PLATE FLANGES are cut out of plate that is bolted up, like a regular forged flange, usually the same bolt diameter, and o.d, and i.d., but varying in thicknesses, for smaller pressure ratings normally or light duct work.
This Plate goes into an orifice fitting, or into an RTJ orifice plate holder. It is a special O.D. plate. It does not change O.D. with the pressure rating. It always fits into another device that varies with the pressure rating of the plate.
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Series 520
Paddle Type Orifice Plate
This Plate fits snugly within the bolt circle of the raised face flanges, so that when the bolt circle gets bigger and smaller the Plate also gets bigger and smaller. The O.D. of the Orifice Plate varies with the pressure of the flange.
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Series 560 Integral Rtj
Orifice Plate
This is an orifice plate between RTJ (Ring-Tongue-Joint) Flanges. The orifice plate and the ring are integral, one piece, solid steel, metal to metal seal. Therefore you cannot remove it. Used for services where the pressure drop is big and it is being used as a restriction plate, or if it is in some service where you don’t want to take a chance on it’s severe cycling service, allowing the screws that hold the plate in position from coming loose. Therefore, it is all a one-piece construction.
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Series 590 Holding Screw
Type Rtj Orifice Plate
Similar to the Integral RTJ Orifice Plate, this plate is held in place by pan head screws. The plate can be removed, in order to put in another plate. Commonly used on larger lines.
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Cup Type Restriction
Orifice Plate
This part goes into a Ground Joint Union and they are sealed on the seats of the Ground Joint Union sealing surface - used for restriction. Sold separately or installed into the Union Type Restriction Orifice Plate.
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Union Type Restriction
Orifice Plate
This is the Union that holds the Cup Type Restriction Orifice Plate.
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Venturi S
A Venturi is a head type measurement device that is similar to an Orifice Plate, but it has less permanent pressure loss. Some are conical at the inlet - straight in the throat - conical at the outlet; some are radiused at the inlet - straight through - conical at the outlet; and some are elliptical at the inlet - straight through - conical at the outlet.
It is the conical at the inlet - straight through - conical at the outlet, that are referred to as ASME type Venturi. A radiused inlet with a conical outlet is usually referred to as a low-loss Venturi.
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Venturi M
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Venturi L
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Venturi XL
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Flow Nozzles
The Flow Nozzle is designed for high velocity flow, usually steam, which is elyptical at the inlet - straight in the throat - and it welds into the pipe. Some have flanges that bolt into the pipe.
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Flange Type
Straightening Vane
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Line Type
Straightening Vane
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