Helden MaxiFit Serie Notice De Montage page 2

MaxiDaptors
MaxiDaptor products are supplied ready assembled and should not
be dismantled. Size range: DN50 to DN700.
1. Helden MaxiDaptor FA's come in three configurations (Fig. 1) with the selection being a
function of the outside diameter and nominal flange drilling.
2. Examine the pipe ends and ensure they are round, smooth, free from bulges, dents and score
marks and within the outside diameter range given on the MaxiDaptor label. Weld beads
must be ground flush, maintaining correct surface profile. Ensure that pipe ends are free from
scale, rust, or any loose debris or other surface defects that may affect coupling performance.
(Fig. 2)
3. Check grade of gasket is suitable for conveyed medium.
4. If the MaxiDaptor has 'T' bolts connecting the main flange body and end ring, ensure that
their heads are correctly located in the recesses in the back flange (Fig. 5).
5. Place the MaxiDaptor onto pipe end (Fig. 3). Adjust the setting gap between pipe end and
MaxiDaptor as necessary (Fig. 4). See setting gap table, but if in doubt contact Helden
Technical Support. Ensure that the pipe end is concentric with the bore of the mating flange.
(Fig. 4)
6. Prior to insertion of flange connecting bolts rotate the MaxiDaptor body so that the nuts are
easily accessible during installation now Fit flange gasket (Helden recommend the use of
an IBC gasket) and ensure it is concentric with the flange connecting bolts (Fig.5). Bolt the
MaxiDaptor to the mating flange (See Fig. 6) using standard bolting procedures.
7. For MaxiDaptors with three T' bolts/studs tighten in a triangular pattern (Fig. 7), where
MaxiDaptors have more or less than three bolts tighten 'T' bolts/studs in a diametrically
opposed sequence (Fig. 8), in all cases give the nuts one or two turns at a time to draw up
the end ring evenly. Using a Torque Wrench, all the nuts must be thoroughly tightened to
achieve the bolt torque figures given below, working around the flange adaptor as many times
as necessary. On completion, radial gap between pipe and flange adaptor end ring should be
even all the way round. Rubber may be seen to extrude into the gap.
Bolt Torque Table
Bolt
M12
M16
Notes:
A. Standard Helden MaxiDaptors DO NOT PREVENT PIPE PULL OUT. The user must ensure adequate external restraint to the
pipework is provided. This is essential.
B. When installing Helden MaxiDaptors on GRP pipe and certain AC pipes a reduced bolt torque is required -
contact the Helden technical support for further advice.
REV01
Torque
Ibf.ft Nm
40 - 50 55 - 65
70 - 90 95 - 120
Setting Gap Table
All Nominal Sizes
Straight Sleeve MaxiDaptor
Sizes u.t.i 150mm Nom.
Sizes 175 to 300mm Nom.
Sizes over 300mm Nom.
Expanded Sleeve MaxiDaptor
Sizes u.t.i 600mm Nom.
Recommended Setting Gap
20mm
25mm
45mm
130mm