PN16 PN25 Forged Steel Flange Weld Neck Pipe Flange With Standard DIN BS UNI

PN16 PN25 Welding Neck Steel Flange With Standard DIN BS UNI

PN16 Flange is designed to operated in pressure up to 16bar, and PN25 flanges is designed to operated in pressure up to 25Bar.
PN in the term DN Flange Dimensions stands for Pressure Nominale. PN is a prefix for pressurerating. ATypically ratings include the
following PN Flange Dimensions i.e.- PN6, PN10PN16, PN25,PN40, PN64, PN100, PN150, PN250, PN Pressure normally appears in
stand of UNI, DIN, BS, EN1092-1. The PN Different pressure is just same as the different Class Rating in the ANSI standard

Product Information/Product Description/Basis Information/Specification

Features /Characteristics

•Carbon steel flanges shall not be used in services above 425 °C

•High-temperature service: Standard carbon steel material shall be ASTM A 105, a material that can be safely

used for temperatures between minus 29 °C and 425 °C.

•Low-temperature Service: Carbon steel flanges used for services below minus 29 °C, shall conform to the

impact-testing requirements of ASME B 31.3.

•ASTM A 350-LF2 shall be the standard material for low temperature applications

•High-Yield Service: High strength carbon steel flanges ASTM A694 should fit API Std. 5L

pipe Grade X42 to X65.

•Material for low-alloy steel flanges (11/4 Cr – 1/2 Mo) shall be ASTM A 182-F11. Material for

intermediate alloy steel flanges (11/2 Cr – 5 Mo) shall be ASTM A 182-F5.

Technology/ How to use and install the different flange types

WELDING NECK FLANGES

They are connected to the pipe by means of a Butt weld connection. They are

used when X-ray testing is required or if the torque over unions are maximum.

Its long tapered neck optimizes the stress distribution.

SLIP-ON FLANGES

This kind of flanges are installed with two weld bead, sliding the pipe inside.

Thus installation costs are lower, so less accuracy is required for pipe cutting.

THREADED FLANGES

They are usually installed with the pipe previously threaded, in places where

welding cannot be done. We do not recommend to install if there are high

pressure variations in the system

LAP JOINT FLANGES

They slide on an overlapped gasket. They are commonly used where it is

necessary to dismantle in order to be cleaned or repaired. Dismantling cost

decreases due to the ease of flange turning and drilling alignment.

.

SOCKET WELD FLANGES

This kind of flange is especially designed for lower small diameters and high

pressures. The pipe is inserted into the flange up to the seat and then is fillet

welded against the cube.

BLIND FLANGES

Blind flanges are utilized for pipe ends, and they bolted to any of the above

flange types.

Material Grades:

Production Process

Flanged Standard

ASME B16.5

This is the most used flange standard worldwide. The standard includes

forged, cast and laminated flanges. It covers service, materials, dimensions,

tolerances, marking and testing for flanges. It also describes all flange types

for size 1/2”to 24”Class 150#, 300#, 400#, 600#, 900# & 1500#, and 1/2”to

12”Class 2500#.

ASME B16.36

This standard is applicable to flanges for flow measurement with orifice plate.

ASME B16.36 flanges have the same dimensions as B16.5 flanges except for the minimum thickness

that is increased to allow measurement orifices.

Moreover, two slots and bolts allow flange separation and the replacement of

the measurement plate. It covers sizes from 1”to 24”Class 300# to 1500#,

and sizes 1”to 12”Class 2500#.

MSS SP-44

An standardization used for thin thicknesses and high strength. It covers

ranges from 12”to 60”Class 150# to 600# and up to 48”Class 900# only

for blind and welding neck flanges. Outside diameter and drilling template

matches with ASME up to 36. Therefore, they can be used with valves and

pumps according to ASME.

ASME B16.47

This standard covers the previous one complementing it with materials,

pressure ratings and temperatures from ASME B16.5. A type class is similar to

MSS-SP44. B type is the same as API 605.

ASME B16.20

It includes materials, dimensions and marking of rings for steel flanges 1/2 to

24”Class 150# to 1500#, and 36”Class 900#.

API 6 A

API 6 A specification has been created for wellheads and Christmas trees.

It includes the standardization of lap joint flanges, which are dimensionally

replaceable with ASME B16.5 ones but adding some tolerances with all sizes.

However, as API materials are more resistant, the maximum service pressure of

API/ASME union is limited to that of lower performance flange.

EN1092-1

This European Standard for a single series of flanges specifies requirements for circular steel

flanges in PN designations PN 2,5 to PN 400 and nominal sizes from DN 10 to DN 4000.

This European Standard specifies the flange types and their facings, dimensions, tolerances,

threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature

ratings and approximate flange masses.

For the purpose of this European Standard, "flanges" include also lapped ends and collars.

This European Standard applies to flanges manufactured in accordance with the methods

described in Table 1. Non-gasketed pipe joints are outside the scope of this European Standard.

Application/Usage

A flange is a method of connecting pipes, valves, pumps, and other equipment to form a piping

system  to convey the water, steam, air, gas and oil. It also provides easy access for cleaning,

inspection, or modification.