A lap joint flange is 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
The lap joint flange itself is not welded or fixed in any way. It
is free to spin for proper alignment with what ever it is joining
to.Lap Joint Flanges have all the same common dimensions as any
other flange named however it does not have a raised face, they
used in conjunction with a "Lap Joint Stub End".
These flanges are nearly identical to a Slip On flange with the
exception of a radius at the intersection of the flange face and
the bore to accommodate the fanged portion of the Stub End.
Their pressure-holding ability is little, if any, better than that
of Slip On flanges and the fatigue life for the assembly is only
one tenth that of Welding Neck flanges.
They may be used at all pressures and are available in a full size
range. These flanges slip over the pipe, and are not welded or
otherwise fastened to it. Bolting pressure is transmitted to the
gasket by the pressure of the flange against the back of the pipe
lap (Stub End).
Lap Joint flanges have certain special advantages:
Freedom to swivel around the pipe facilitates the lining up of
opposing flange bolt holes.
Lack of contact with the fluid in the pipe often permits the use of
inexpensive carbon steel flanges with corrosion resistant pipe.
In systems which erode or corrode quickly, the flanges may be
salvaged for re-use.
Type: Lapped joint Type Flange
Material: Carbon Steel IS 2062, IS 2002, ASTM A515 GR. 60/70
Dimension: ASME-ANSI B16.5, ASME-ANSI B16.47, AWWA C207, BS 1560,
IS 13159, BS 3293, BS 4504
Size Range: 15NB to 1200NB
Alloy SteelASTM A 182, GR F1, F11, F22, F5, F9, F91
Carbon SteelASTM A 105, ASTM A 181
Nickel AlloysMonel 400 & 500, Inconel 600 & 625, Incolloy
800, 825, Hastelloy C22,C276
Copper AlloysCopper, Brass & Gunmetal
Size1/8" NB TO 48"NB.
Class150, 300,400 ,600,900, 1500 & 2500 .
ANSIANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
B.SBS4504 , BS4504, BS1560, BS10
DIN :DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655,
DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633,
DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
Flange’s technological process