Crux Products - Heavy Duty Diaphragm Closures - Specialist Components for Oil & Gas and Wind Energy Sectors

CRUX Heavy Duty Diaphragm Closures

CRUX 'Heavy Duty' Diaphragm Closures as required for the provision of auxiliary buoyancy, are made from rubber with fabric reinforcement. Fixing is achieved by clamping a solid core, around which the laminations of reinforcing 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 toBS3692 Grade 8.8.

Crux Heavy Duty Diaphragms command the largest share of the worldwide market.

Internal Diaphragm Closures

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.

PILE SIZE	DIMENSIONS in mm			BOLT SIZES
in inches	A	B	C	number and (mm)
24	854	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	1758	80	36 x 20
66	2194	1928	100	36 x 20
72	2314	2070	100	42 x 20
84	2564	2320	100	42 x 24
96	2804	2534	100	48 x 24

NOTE: Pile sizes are compatible with Grout Seals as noted. Diaphragm dimensions will vary according to actual member sizes and individual project requirement.

Internal Diaphragms Closures 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.