What does two holing a flange mean?

What does two holing a flange mean?

To two hole a flange means to have the two top holes of a flange straddle the vertical centerline of the flange. This is easily accomplished using two pins that fit the bolt hole and make the pins level while still straddling the vertical center line.

What are different types of flanges?

How do they look like? The key types of flanges are the welding neck, long welding neck, slip-on, socket weld, lap joint, threaded and blind flanges. In addition to these standard flanges, some special ones exist, called Weldoflange/Nipoflange and Elboflange, swivel flange, expander/reducer flange, and orifice flanges.

How many types of pipe flanges are there?

Most commonly used flanges are weld neck flange, slip on flange, blind flange, socket weld flange, threaded flange and lap joint flange (RTJ Flange). This type of connection in a pipe flange allows for ease of disassembly and separation for repair and regular maintenance.

Is flange a fitting?

Plumbing or piping A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together. Although the word flange generally refers to the actual raised rim or lip of a fitting, many flanged plumbing fittings are themselves known as ‘flanges’:

What is difference between Series A and B flanges?

Sizes 26″ and bigger are covered by B16. 47 series A or series B for weldneck and blind flanges. Series A flange is heavier, thicker and cost more whereas series B flange has more bolt holes and is lighter cheaper than series A. API605 flange and series B flanges are same thing.

What does PN mean in flanges?

Pressure Nominale

What is class 150 in flange?

As temperature increases, the pressure rating of the flange decreases. For example, a Class 150 flange is rated to approximately 270 PSIG at ambient conditions, 180 PSIG at approximately 400°F, 150 PSIG at approximately 600°F, and 75 PSIG at approximately 800°F.

What is slip on flanges?

Slip on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. The OD of slip on flange is also welded on the back side of the flange.

Where slip-on flanges are used?

Applications of slip-on flanges They are mainly used for fluids at low pressure or with little risk of leakage. It is very common to find these flanges today in cooling water lines, firefighting water lines, low-pressure compressed air lines, and process lines for substances such as steam, oil, gas, condensates, etc.

What does RTJ flange mean?

Ring-Type Joint

What is the difference between lap joint flange and slip-on flange?

lap joint flanges are very similar to a slip-on flange, with the main difference being that it has a curved radius at the bore and face to house a lap joint stub-end. Lap joint flanges and stub-end assemblies are typically used in situations where frequent dismantling is required for for inspection.

Is a lap joint flange raised face?

Lap-Joint Flanges with a Stub End The lap joint flange can be used in sizes and pressure classes similar to that of a weld-neck flange. The nature of this joint means that the stub end facing is also the flange facing, which makes it raised faced, and the gasket seating surface.

How do I know what class my flange is?

When trying to determine the flange rating of a pump, the best method is to look for a stamp printed onto the flange. If one is not visible, or it is worn, then start by counting the number of bolt holes. This will point you to a narrower range of flange sizes in the chart below. Next measure the bolt circle diameter.

What is the difference between blank flange and blind flange?

A blind flange dead ends the tubing flow; a blank flange is one that is to be machined to a finished product. A blind flange is a solid flange as shown below. The purpose of these is to block off a section of pipe or a nozzle on a vessel that is not used.

What are blanking flanges used for?

Blind flanges are commonly produced and stocked in several different materials. They are often called Blank Flanges. These flanges are used for capping off or terminating another flange.

What is a blind in piping?

A blind flange is a solid flange as shown below. The purpose of these is to block off a section of pipe or a nozzle on a vessel that is not used. Blind flanges, just like standard pipe flanges, can be raised face (RF) or flat faced (FF).

What is flange Adaptor?

Used to connect networks composed of different materials or specially designed for one material, flange adaptors join a flanged part to the spigot end of a pipe or tube. They come in anchoring or non-anchoring versions, while the self-anchoring (locking) products do not necessitate concrete anchor blocks.

What is a flange coupling adapter?

Restrained Adapter Flange Coupling for DI Pipe is a restrained adapter flange coupling device designed to connect plain end ductile iron pipe to a flanged pipe, valve or fitting. A ductile iron flange body provides the flange connection and includes an O-ring gasket that seals with the mating flange.

What is an MJ fitting?

MJ stands for Mechanical Joint. It is a type of compression joint designed for underground connection for pipe, valves and fittings. The spigot end of a pipe receives the gland and gasket and is then inserted into the MJ bell of the connecting pipe, valve or fitting.

What is a uni flange?

Uni-Flange eliminates the problems of pre-engineered, prefabricated piping systems. Pipe fabrication can be performed on site, using plain end pipe, a pipe cutter and a wrench. No threading, welding or grooving is necessary. The Uni-Flange eliminates the need to rely on off-site fabricators and machine shops.

What is a MJ coupling?

The Mechanical Joint (MJ) Coupled Joint offers a method of providing joint restraint with a standard mechanical joint socket of a pipe, fitting, valve or other product. The MJ Coupled Joint is commonly used as a method of joint restraint for mechanical joint all-bell fittings and especially to restrain MJ valves.

How many number of restraints should be imposed on a joint to make it a solid joint?

six

How does a mechanical joint work?

The mechanical joint seals by the force of the t-bolts pushing the gland which moves and compresses the gasket. This pressure causes the gasket to exert enough force against the surfaces of the pipe and fitting to form a seal. Rubber is well known for its friction properties.

Can ductile iron pipe be threaded?

The inside of ductile iron pipe threading is typically highly resistant to corrosion. The interior of the ductile iron pipe is commonly lined with cement mortar to help extend the lifespan of the piping material when used for water transmission.

Is Ductile Iron Pipe 8329?

A separate standard IS -9523 covers the specification on such fittings. 1.5 Fittings conforming to IS 13382 may also be used with ductile iron pipes, when the pressure require- ments matches. 3.1 Ductile Iron – Type of iron used for pipes, in which graphite is present primarily in spheroidal or nodular form.