Table of Contents
How do you identify a flange?
You need to find the outer diameter, the inner diameter, the number of bolt holes, bolt hole diameter, and the bolt circle diameter. Bolt circle diameter (B.C.) is one of the most important measurements to make when identifying a flange.
What do the numbers mean on a flange?
The key sizes for a pipe flange are: the nominal size (i.e. the bore size of the flange, to match the bore size of the connecting pipe) the flange rating (which designates the pressure/temperature performance of the flange, i.e. 150#, 300#, 400#, up to 2500#)Dec 18, 2018.
What is flange bolting?
As its name suggests, a flange bolt is a fastener that features a skirt extending outwards from the head in a 360 degrees angle. Flange bolts are capable of providing the same bonding power as a washer, although in some applications they can be employed along with regular bolts paired with washers.
What bolts to use for flanges?
The most common materials for stud bolts (for flanges) are ASTM A193 (grade B7, B8, B8M, B8T), ASTM A453 (grade 660), ASTM A320 (grade L7, L7M), and ASTM A182 (duplex and super duplex bolting). For aggressive fluids and environments, stud bolts can be coated with Xylan, Xylar and other materials.
Is a flange considered a fitting?
Pipe Flanges are widely used as a popular category of pipe fittings. A flange is used to mechanically connect two pipes together. Thus, flanges are considered to be projecting or internal components which are used to support mechanical parts.
How many types of flanges are there?
Flange types 5 are: Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded and Blind flange. Below you will find a short description and definition of each type, completed with an detailed image.
What is pound rating of flange?
5 standard. The pressure rating of flange ranges from 150# to 2500#. The term “lb”, “class” and “#” are used interchangeably to designate the pressure rating of the flange. The fact is that 150 lb has no relation to 150 psi and so does the 300 or 600 lb does not correlate to 300 or 600 psi pressure rating.
What is PN in flange?
PN is an acronym for “Pressure Nominale”. The PN is used as a prefix to the pressure rating of the Flanges. Following international flange standards such as ISO 7005-1 or DIN 2501, PN10, PN16, PN25, and PN40 specify both pressure class in pressure bars and metric flange dimensions that use the metric measuring system.
What does PN and DN mean?
Nominal diameter (DN) and nominal pressure (PN)May 24, 2018.
Where are flange bolts used?
The flange bolts are usually used in vehicle frames, especially in trucks and anywhere a head bolt is required. They feature a nozzle, thereby speeding the assembly while eliminating the washer. They render four times the bearing area than of a standard hex screw.
Are flange bolts better than washers?
Standard washers are typically softer than the nuts and bolts that they are used with and can often plastically deform under the high compressive stress that they must sustain. Flange headed nuts and bolts do not suffer from this effect since the washer face is as strong as the bolt/nut itself.
Do you need washers with flange bolts?
Addition of steel washers to a fastener system is recommended to improve translation of torque input into bolt preload. Washers provide a smooth bearing surface, reducing friction between nut and flange. This effect is greatest when washers are through-hardened.
How are stud bolts made?
Cold forging – Molding the steel into the right shape at room temperature. Bolt head – Progressively formed by forcing the steel into various dies at high pressure. Threading – Threads are formed by rolling or cutting. Heat treatment – The bolt is exposed to extreme heat to harden steel.
What is the purpose of a flange?
Flanges are used to connect pipes with each other, to valves, to fittings, and to specialty items such as strainers and pressure vessels. A cover plate can be connected to create a “blind flange”. Flanges are joined by bolting, and sealing is often completed with the use of gaskets or other methods.
How are flanges attached to pipes?
Socket-weld pipe flanges are typically used on smaller sizes of high pressure pipes. These flanges are attached by inserting the pipe into the socket end and applying fillet weld around the top. This allows for a smooth bore and better flow of the fluid or gas inside of the pipe.
What is flange type?
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.
What are the two main types of flanges?
We usually consider two main families of flanges, the standard flanges and the special ones.
What is threaded flange?
Threaded flanges, also sometimes referred to as companion flanges / screw flanges / NPT flanges, contain a female NPT thread in the center for connection to male NPT threaded piping. The male pipe end is joined to the flange without a weld connection required but can be sealed with a weld if necessary.
How do I check my flange rating?
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.
Are 300 and 600 flanges the same?
Different Pressure Classes for Flanges The difference between these three flanges is the pressure class! This is a class 150, this is a class 300, and this is a class 600. The differences are in the dimensions except for the bore!Mar 27, 2020.
Why is it called a 150 flange?
The obvious answer might be that a Class 150 flange can withstand 150 PSIG. After all, why would it be called a Class 150 flange if it were not capable of withstanding Class 150. Flanges can withstand different pressures at different temperatures. As temperature increases, the pressure rating of the flange decreases.
