ORIFICE PLATES AND CARRIER ASSEMBLIES

Techno-Flow is dedicated to providing the SOUTH AFRICAN  and OVERSEAS MARKETS with Quality Service and products. Techno-Flow adopt a pro-active role in advancing local technology by having pioneered the manufacture of process instrumentation.

ORIFICE PLATES

Orifice Plate manufacture at Techno-Flow is quality controlled from the selection of new material to the packaging of the finished product.

• EDGES:
  Sharp & square, will not reflect a beam of light when viewed without magnification.
• FINISH:
  15-30 Micro-inch roughness.
• FLATNESS:
  Flat within 0.010 inches per inch of dam height. (dam height = pipe diameter - orifice diameter divided by 2).
• BORE:
  Orifice bore tolerance strictly in accordance with A.G.A, Asme, ISO5167, ISA and BS standards.
• MATERIAL:
  Stock materials are 304 & 316L Stainless Steel, Monel, Hastelloy. B & C and various other materials such as PVDF, PTFE Polypropylene etc. upon request.

RING-JOINT ORIFICE PLATE HOLDERS

Ring Joint Holders (RTJ's) are fitted with Orifice Plates and are used with Ring-Joint Orifice Flanges. The Oval Form is standard.

  ONE PIECE RING JOINT HOLDER  WITH INTEGRAL ORIFICE PLATE

  MULTI-HOLE ORIFICE PLATE

  ONE PIECE ORIFICE CARRIER

Techno-Flow Accessories offer a comprehensive range of precision attachments to compliment the manifold series. These accessories are aimed at easing the design and maintenance engineer's tasks respectively.

Techno-Flow Orifice Plate Guide

BORE AND BEVEL

The bore and bevel is the standard method of limiting the plate edge thickness. The bevel is machined at a 45° angle to the desired edge thickness. Unless otherwise specified, plates will be bevelled to 1/50 of the line I.D. or 1/8 of the orifice bore, minimum governing.

BORE AND COUNTER BORE

The Bore and Counter bore is a special method in limiting the plate edge thickness. Instead of beveling at the normal 45°, the plate is counter bored to the desired edge thickness.

SEGMENTAL

Segmentally bored orifice plates are provided for measurements where solids are entrained in a gas or liquid flow stream. The circular portion of the bore is inscribed within a circle which is normally 98% of the pipe diameter. The segmental opening may be placed either at the top or bottom of the pipe. Industries using these bores include sewage treatment, steel, chemical, water conditioning, paper and petrochemical

ECCENTRIC

Eccentrically bored plates are plates with the orifice off-center, or eccentric, as opposed to concentric. The bore of the eccentric orifice is normally inscribed in a circle which is 98% of the pipe diameter, so that solids or slurries may pass through. Eccentric orifice plates are used in many industries including heavy and light chemicals, steel, paper, atomic and petrochemicals.

QUARTER ROUND

The Quarter-Round, or Quadrant bore, is an orifice with the inlet edge rounded. The radius of the quarter-circle bore is a function of the orifice-to-pipe ratio (d/D). Thickness at the throat is equal to the radius. This bore is specifically designed for fluids of high viscosity, such as heavy crude's, syrups and slurries. Quarter-Round bores are recommended for viscous flows having Reynolds Numbers below 100,000.

CALCULATIONS

Techno-Flow also provides a service to do calculations on orifice and restriction orifice plates using the Flowel sizing program.

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