Flange Types

A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.

• Materials for Flanges, Measure the size of a flange



Packing the pipe flange

• Pipe Flanges Raw Material Specifications
• Applications of flanges
• Flange Face Surface Finish
• Pressure Classes of Flanges
• Flanges Manufacturing Process
• Flange materials acc. to ASTM
• Stainless flange, Forged flange

Below are our available industrial pipe flanges that will meet your project needs. We will help you put together your entire project and ship it to your closest port.

We ship globally! Contact us to speak with one of our experienced staff, who can help you with your project needs.

Blind Flanges>> The blind flange is used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes.

Figure-8 Blanks >> A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.

Lap Joint Flanges >> The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.

Orifice Flanges >> Orifice flanges are used instead of the standard pipe flanges when orifice plate or flow nozzle is used.

Reducing Flanges >> Reducing flanges are used in pipe-to-pipe connections. Reducing flanges are a little easier to bolt up than non-reducing flanges.

RTJ Flanges >> Ring Type Joint Flange is a method of ensuring leak proof flange connection at high pressures.

Socket Welding Flanges >> The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension.

Slip-On Flanges >> The Slip-on flange has a low hub because the pipe slips into the flange prior to welding.

Threaded Flanges >> Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded.

Welding Neck Flanges >> The Welding neck flanges is normally referred to as the high hub flange.

Flanges process

Pipe flanges are manufactured in all the different materials like stainless steel, cast iron, aluminium, brass, bronze, plastic etc. but the most used material is forged carbon steel and have machined surfaces. In addition, flanges, like fittings and pipes, for specific purposes sometimes internally equipped with layers of materials of a completely different quality as the flanges themselves, which are "lined flanges".  The material of a flange, is basically set during the choice of the pipe, in most cases, a flange is of the same material as the pipe. All flanges, discussed on this website fall under the ASME en ASTM standards, unless otherwise indicated. ASME B16.5 describes dimensions, dimensional tolerances etc. and ASTM the different material qualities.

Size: 1/2" NB To 24" NB.
Class: 150#, 300#, 600#, 900#, 1500# & 2500#.

In addition, we also can produce the DIN flange, and the forgings according to the customers drawings, for example, rings and shafts.

Delivery requirment:

Marking: SunnySteel, material grade, standard, specification, heat no.

Surface Treatment: Bright annealed, polished outside and inside surface.

Package: Each pipe in a PVC bag and caps on both ends then bundled in wood case, (option: Bundle with knitted plastic bag/stee crate. )

Inspection: Third party inspection, or by clints

Orifice Flanges

Two Orifice Flanges are called an orifice flange union. Each flange comes with two pipe taps for measuring the pressure drop of the flow through an orifice plate. Orifice plates do not come with the flanges and are sized based on the requirements of the process. Two jack screws are used to spread the flanges apart in order to change the orifice plate. This flange is normally available in weld neck, slip-on, and threaded flanges. These flanges have a raised face.

An Orifice Flange is similar in almost every aspect to their respective flanges, except that they have holes in the side of the flange perpendicular to the bolt holes. These holes act as instrumentation outlets for such things as pressure gauges, flow speedometers etc. These flanges are widely used in conjunction with orifice meters for measuring the rate of flow of liquids and gases.

Orifice Flanges are installed in a straight run of pipe in order to avoid turbulence at the plate. As a rule of thumb, an orifice flange has ten diameters of straight pipe upstream and five diameters of pipe downstream. There are guidelines set out in the industry for accurate results.

An Orifice Flange is intended for use instead of standard pipe flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure tapings are machined into the Orifice Flange, making separate orifice carriers or tapings in the pipe wall unnecessary. This type of flange includes the orifice plate with data tap, a pair of flanges with integrated taps, a set of gaskets, bolts and nuts and a jackscrew to assist separating the flanges for orifice inspection.
Design can be with RF or RTJ weld neck flanges or RF slip-on flanges. The orifice plates are centered within very close tolerances of the standards.
An Orifice plate is a device used for measuring flow rate. Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate. It uses the Bernoulli’s principle which states that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases and vice versa.

An Orifice plate is a thin plate with a hole in the middle. It is usually placed in a pipe in which fluid flows. When the fluid reaches the orifice plate, the fluid is forced to converge to go through the small hole; the point of maximum convergence actually occurs shortly downstream of the physical orifice, at the so-called vena contracta point As it does so, the velocity and the pressure changes. Beyond the vena contracta, the fluid expands and the velocity and pressure change once again. By measuring the difference in fluid pressure between the normal pipe section and at the vena contracta, the volumetric and mass flow rates can be obtained from Bernoulli’s equation.

When installing the orifice plate flange the pressure taps need to be at the same elevation to each other. The assumption when making the calculation for the orifice plate is that static head of the tubes is the same on both sides of the orifice plate. Pressure taps should not be installed facing down as the taps could become plugged with debris in the line.

Weld Neck Orifice Flanges are butt-welded into the pipeline. The inside diameter (bore diameter) of the pipe should be specified when ordering. Weldneck orifice flanges are available in ANSI classes 300, 600, 900, 1500 and 2500. They are not available in ANSI 150 sizes because the thickness of ANSI 150 flanges are not enough to allow for drilling pressure taps.

Standards, Dimensions & Weight

• 300# Slip-On Orifice Flange
• 300# Weld Neck Orifice Flange
• 600# Weld Neck Orifice (raised face and RTJ ring type joint) Flange
• 900# Weld Neck Orifice (raised face and RTJ ring type joint) Flange
• 1500# Weld Neck Orifice (raised face and RTJ ring type joint) Flange
• 2500# Weld Neck Orifice (raised face and RTJ ring type joint) Flange

Orifice flange draws :

• Size: 1/2” to 60”, DN 12mm to DN 1500mm
• Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
• Slip On Class 300
• Threaded Class 300
• Facing: RF / RTJ

Material:

Cabon steel: A105, A350 LF2

Stainless steel: A182 F304/F304L/F316/F316L/F321

Alloy steel: F11, F12

Packing: plywood case and plywood pallet