Flange is a discoid
parts, in the pipeline project, the most common
use of the flange are paired. In the pipeline
project, mainly used for pipeline flange connection.
The need to connect the pipeline, installed
a variety of flange, low-pressure pipelines
can use silk to flange, four kilograms more
than the pressure of the use of welding flange.
Between the two flange with sealed, then bolts
fastening. The pressure flange have different
thickness and use a different bolt. Pumps and
valves, and pipes connect, these local equipment,
but also made corresponding to the flange shape,
also known as the flange connection. All in
two plane surrounding the use of bolts in the
connector link at the same time closed the parts
are generally referred to as "flange",
such as ventilation pipe connections, the parts
can be called "flange parts." But
this connection is only a partial equipment
such as pumps and the flange connection, not
the pump is "flange parts." Such as
the relatively small valves, etc., can be called
"flange parts."
Flange connecting the construction of the pipeline
is an important connection.
Flange is connected to two pipes, fittings
or equipment, to their respective fixed in a
flange on the flange between the two, together
with flange pad, together with bolts fastening
to complete the connection. Some of the pieces
of equipment have been built and the flange,
is a flange connection.
The flange connecting thread (silk T) flange
and welding flange. Low-voltage wire to a small-diameter
flange, high pressure and low pressure are the
use of large diameter welded flange, different
pressure the thickness of the flange and bolt
diameter and the number is different.
According to the pressure on different levels,
the flange pad have different materials, asbestos
from the low-pressure pads, high-pressure pad
to asbestos have metal pad.
Flange connection easy to use, able to withstand
greater pressure.
In the industrial pipeline, the flange connected
to the use of a very wide range. Within the
family, small diameter pipeline, but is low
pressure, invisible flange connection. If the
boiler room or a production site, are everywhere
flange connection of pipelines and equipment.
GB flange as follows: type implementation of
the standards Nominal pressure (mpa) the diameter
(mm) A material applied temperature flange JB/T4701-2000JB4726-2000JB4728-20000.25MPa-1.6MPaDN300-DN2000Q235-A,
B, C2016MnR> -20 ° -200 °> -20 ° -350
° B flange JB/T4702-2000JB4726-2000JB4728-20000.25MPa-4.0MPaDN300-DN3000Q235-A,
B, C2016MnR2016Mn> -20 ° -200 °> -20 °
-350 ° Neck welded flange JB/T4703-2000JB4726-2000JB4728-20000.6MPa-6.4MPaDN300-DN200020R16MnR20R16Mn15CrMo16MnD09MnNID12Cr2MoI>
-70 ° -450 °> -70 ° -260 °> -70 ° -400
°> -70 ° -450 ° pipeline Threaded flange
sealing surface smooth pattern of standard H12-67,
H21-67 Nominal pressure PN = 22-32MPa calibre
DN = 10 ~ 150mm material carbon steel, alloy
steel, stainless steel pipe welded flange plate-type
sealing surface smooth surface, Trapezoidal
groove of the standard JB/T81C94, HG20593-97,
GB/T9113-2000 Nominal pressure PN = 0.25 ~ 2.5MPa
calibre DN = 10 ~ 2000mm material carbon steel,
alloy steel, stainless steel pipe welded steel
flange sealing surface smooth pattern Face,
Tuao face, trapezoidal groove of the standard
JB/T9116-2000, HG20594-97, GB/T82-94, HG20595-97
Nominal pressure PN = 1.0 ~ 25MPa calibre DN
= 10 ~ 2000mm material carbon steel, alloy steel,
stainless steel Pipeline cover flange, blind-type
sealing surface smooth surface, Tuao face, trapezoidal
groove of the standard GB/T9123-2000, HG20601-97,
JB/T86-94, H13-67 Nominal pressure PN = 0.25-32MPa
calibre DN = 10 ~ 2000mm material carbon steel,
alloy steel, stainless steel.
China's steel flange system of national standards
GB
1) Nominal pressure: 0.25 Mpa ~ 42.0Mpa
a, Series 1: PN1.0, PN1.6, PN2.0, PN5.0, PN10.0,
PN15.0, PN25.0, PN42 (main series)
b, Series 2: PN0.25, PN0.6, PN2.5, PN4.0
One PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0
a total of six grades of flange size of a flange
to Germany as the representative of the European
flange system and the rest for USA and France
Portland flange as the representative of the
Inter-American system.
In GB standards, the flange subordinate to the
European System of Nominal pressure level for
the largest 4 Mpa, flange subordinate to the
Inter-American System of Nominal pressure level
for the largest 42 Mpa.
2) Nominal Path: 10 mm ~ 4000mm
3) flange of the structure forms:
The flange
Unit flange
a, threaded flange
b, welding flanges welded flange
With welded flange-neck with neck-Chengcha welded
flange plate welded flange
c, Central welded flange-song sets of cuffs
neck-ring-song sets of welded flange plate welded
flange-ring-song sets of plate flange plate
sets of turn-flange
d, covered flange (blind hole flange)
4) flange sealing surface: flat, concave, convex
surface, the tenon slot face, Central Link -
International code: FLANGE flange,
W / N FLANGE Drive with welded flange
S / O FLANGE band Drive-welded flange
BLIND FLANGE blind flange plate
HS:73079100
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