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CRUX Heavy Duty Diaphragm Closures

Crux 'Heavy Duty' Diaphragm Closures, as required for the provision of auxiliary buoyancy purposes, are made from rubber reinforced with polyester fabric. Fixing is achieved by clamping a solid nylon core, around which the laminations of polyester fabric are wrapped between two machined flanges.
The required Diaphragm strength for specified application is achieved by provision of appropriate fabric strength and number of plies.
Crux 'Heavy Duty' Diaphragms are unique in that they are manufactured with one side of the Diaphragm flat. The Diaphragm is then deformed to fit into the fixing grooves within the flanges by torquing the fixing bolts. This forced deformation of the Diaphragm ensures that a seal is obtained, even at early stages of bolt torquing. Tolerance to flange distortion resulting from welding is much better than with other competitor diaphragms.
Flanges are constructed from steel material EN10025 Grade S275 (ASTM A36) or equivalent. High strength steel can be used where strength requirement or client specification dictates. All bolts and nuts used are zinc plated according to BS 3692 Grade 8.8.

Other features of the Crux Diaphragms :
• Flanges are shaped to avoid stress concentrations within the Diaphragm.
• Diaphragms are designed to suit specific platform requirements and generally tested to 1.5 times the calculated hydrostatic pressure.
• Crux Heavy Duty Diaphragms command the largest share of the worldwide market.
PILE SIZE
in inches
DIMENSIONS in mm
BOLT SIZES (mm)
and number
A
B
C
24
865
660
66
16 x 16
30
1184
980
66
20 x 16
36
1344
1130
70
24 x 16
42
1504
1290
70
24 x 16
48
1656
1432
80
30 x 16
54
1838
1614
80
30 x 16
60
2030
1806
80
36 x 20
66
2194
1928
100
36 x 20
72
2314
2070
100
42 x 20
84
2564
2320
100
42 x 25
Internal Diaphragms
Internal Diaphragms are provided where there can be no external projection on the subject tubular.
The Diaphragm specification is as above but the fixing is provided in the form of two rings.
Mud-Exclusion Diaphragms - click here
Pile sizes are compatible with Grout Seals as noted. Diaphragm dimensions will vary according to actual member sizes and individual project requirement.