The first original Compact Flange designed to meet the requirements of ASME VIII Div 1 & 2, Type Approved & Fire Tested.
Offering weight savings of up to 88% when compared to the equivalent ANSI Flange. Quick and easy make-up with superior mechanical strength and fatigue performance.
The Desflex Compact Flange is ideal for both topsides and sub-sea applications where minimum weight is essential and reduced maintenance.
Both standard and swivel type weld neck flanges are available in Carbon, Stainless, Alloy and Duplex steels.
Desflex Flanges are Type Approved and have successfully passed API Fire tests.
Available to meet NORSOK standards
The patented design includes several unique features including spherical nuts on the bolting to reduce bolt stresses and a toe at the outside diameter to limit Flange rotation and to prevent overstressing of the flange.
Reusable metal-to-metal Seal
The Destec D and RD range of all metal Seal Rings are used.

Substantial size and weight saving when compared with standard API and ANSI flanges using compressible and/or ring type joints of the same rating.
JUST COMPARE:
6″ – 2500 lb ANSI flange with bolting – 783 lb (355 kg)
6DF25-D135 = 188 lb (85.2 kg)
A 76% SAVING IN WEIGHT.
Profile of hydraulic tensioner. Standard Desflex flanges are designed to accept hydraulic bolt tensioners.
Flanges stress during assembly is controlled by limiting flange rotation via a small gap at the toe of the flange. Excessive bolt tightening cannot overstress the flanges.
Spherically seated nuts minimise overstressing of the bolts due to bending. On standard flanges flange rotation can cause the bolting faces to be 2° out of parallel.
THE DESTEC 'D' TYPE METAL-TO-METAL SEAL
This well established and proven seal provides the ultimate in reliability under high pressure, high temperature and thermal cycling.
FLUSH BORE
The 'D' type seal is flush with the bore of the pipe. Specials are not required for a 'clinical' joint

The Desalign Misalignment Ball Flange connector is used where there is a misalignment in the pipeline, and is also a swivel flange that mates to a standard Desflex compact flange.
The assembly is 1500 lbs or 900 lbs ANSI rated, piggable in both directions and is sealed at the bore using Destec sealing Technology.
Sizes from 4' to 24'.

1500 lb rated Ball swivel assemblies
Nominal Pipe Size | Desflex Flange Size | Ball Seal Size | Ball Swivel Assembly |
---|---|---|---|
4″ | 4DF15 | 15HDB 95 | 4DFB15 |
6″ | 6DF15 | 15HDB 140 | 6DFB15 |
8″ | 8DF15 | 15HDB 180 | 8DFB15 |
10″ | 10DF15 | 15HDB 225 | 10DFB15 |
12″ | 12DF15 | 15HDB 260 | 12DFB15 |
14″ | 14DF15 | 15HDB 290 | 14DFB15 |
16″ | 16DF15 | 15HDB 335 | 16DFB15 |
18″ | 18DF15 | 15HDB 375 | 18DFB15 |
20″ | 20DF15 | 15HDB 415 | 20DFB15 |
24″ | 24DF15 | 15HDB 495 | 24DFB15 |
900 lb rated Ball swivel assemblies
Nominal Pipe Size | Desflex Flange Size | Ball Seal Size | Ball Swivel Assembly |
---|---|---|---|
4″ | 4DF9 | 9HDB 105 | 4DFB9 |
6″ | 6DF9 | 9HDB 155 | 6DFB9 |
8″ | 8DF9 | 9HDB 200 | 8DFB9 |
10″ | 10DF9 | 9HDB 250 | 10DFB9 |
12″ | 12DF9 | 9HDB 295 | 12DFB9 |
14″ | 14DF9 | 9HDB 325 | 14DFB9 |
16″ | 16DF9 | 9HDB 370 | 16DFB9 |
18″ | 18DF9 | 9HDB 415 | 18DFB9 |
20″ | 20DF9 | 9HDB 465 | 20DFB9 |
24″ | 24DF9 | 9HDB 555 | 24DFB9 |
For more information about our products and services call us on 01522 791721 or email us at sales@destec.co.uk
Making and Maintaining the right connection.
DESTEC ENGINEERING LTD
Five Mile Lane, Washingborough,
Lincoln. LN4 1AF. UK
Tel: +44 (0) 1522 791 721
Fax: +44 (0) 1522 790 033
Email: sales@destec.co.uk
For On-Site Services
Email: service@destec.co.uk
Out Of Office Contact:
+44 (0) 7854857865
Office Hours
Mon-Thu: 08:30-17:00
Fri: 08:30-16:30
Sat-Sun: Out of office contact