Lap Joint Flange/Loose Flange

2019-06-20 17:29:21 Views:2438 Forged Flanges / Lap Joint Flange / Products

What is a lap joint flange or loose flange?

Lap joint flange(LJ flange) also called loose flange,it consists two parts,the backing flange and the stub end.The stub end will be butt welded to the pipe,the backing flange will be slip around the stub end.The backing flange is not connected to the pipe or stub end directly and it could be rotated.So it is convenient to install the flange connection if there is some misalignment between the bolt holes.

ASTM A182 F304 lap joint flanges

Specifications of lap joint flange/loose flange:

ANSI/ASME standard:

ANSI/ASME B16.5 class 150 lap joint flange dimensions: ½”-24″
ANSI/ASME B16.5 class 300 lap joint flange dimensions: ½”-24″
ANSI/ASME B16.5 class 400 lap joint flange dimensions: ½”-24″
ANSI/ASME B16.5 class 600 lap joint flange dimensions: ½”-24″
ANSI/ASME B16.5 class 900 lap joint flange dimensions: ½”-24″
ANSI/ASME B16.5 class 1500 lap joint flange dimensions: ½”-24″
ANSI/ASME B16.5 class 2500 lap joint flange dimensions: ½”-12″

EN standard:

EN 1092-1 PN6 loose plate flange dimensions: DN10-DN1200
EN 1092-1 PN10 loose plate flange dimensions: DN10-DN1200
EN 1092-1 PN16 loose plate flange dimensions: DN10-DN1000
EN 1092-1 PN25 loose plate flange dimensions: DN10-DN800
EN 1092-1 PN40 loose plate flange dimensions: DN10-DN600

JIS standard:

JIS B2220 5K lap joint flange without hub dimensions: 15A-400A
JIS B2220 5K lap joint flange with hub dimensions: 450A-600A
JIS B2220 10K lap joint flange without hub dimensions: 15A-200A
JIS B2220 10K lap joint flange with hub dimensions: 250A-600A
JIS B2220 16K lap joint flange with hub dimensions: 15A-600A
JIS B2220 20K lap joint flange with hub dimensions: 15A-600A

Materials of lap joint/loose flange:

Haihao Group manufacture lap joint flanges with various materials,such as carbon steel,stainless steel and alloy steel.

Carbon steel lap joint flange:

ASTM A105 lap joint flange
ASTM A350 LF2 lap joint flange
SS400 lap joint flange
P235GH lap joint flange
P250GH lap joint flange
C22.8 lap joint flange
Q235 lap joint flange

Stainless steel lap joint flange:

ASTM A182 F304 lap joint flange
ASTM A182 F304L lap joint flange
ASTM A182 F316 lap joint flange
ASTM A182 F316L lap joint flange
ASTM A182 F321 lap joint flange
ASTM A182 F347 lap joint flange

Alloy steel lap joint flange:

ASTM A694 F42 lap joint flange
ASTM A694 F46 lap joint flange
ASTM A694 F52 lap joint flange
ASTM A694 F56 lap joint flange
ASTM A694 F60 lap joint flange
ASTM A694 F65 lap joint flange
ASTM A694 F70 lap joint flange
ASTM A182 F5 lap joint flange
ASTM A182 F9 lap joint flange
ASTM A182 F11 lap joint flange
ASTM A182 F12 lap joint flange
ASTM A182 F22 lap joint flange
ASTM A182 F91 lap joint flange

Sealing face of lap joint flange:

The lap joint flange(loose flange) only have a flat face,the stub end face is the sealing face in the two lap joint flanges connections,so the stub end should have a same dimensions with the raised face standard.

Haihao Group are specialized in the production of forged flanges,our forged flange products as follows:

Weld Neck Flange	Blind Flange	Slip On Flange	Flat Flange
Socket Weld Flange	Threaded Flange	Lap Joint Flange	Long Weld Neck Flange
Orifice flange	Spectacle Blind Flange	Nipoflange	Reducing Flange
Anchor Flanges	Large Diameter Flange	Tubesheet	Non-standard Flange