Gaskets

Description:

TBJ Africa is well positioned to supply a comprehensive range of sealing materials and services to customers in various African Countries and is fully supported by strong technical teams in the business. Our product offerings are used in a wide range of industrial applications within the following sectors:

• Petrochemical
• Mining
• Oil & Gas
• Sugar Refining
• Power generation
• Food & Beverage
• Pulp & Paper
• Chemical

Onshore plants ranging from grass root refineries, onshore gas plants, LNG, GTL & various chemical plants. Offshore installations, both concrete & steel jackets / platforms, subsea installations and more recently FPSO’s.

Our access to global technical expertise ensures the competitive edge for TBJ Africa when it comes to product innovation and solutions for industry. Through international partnerships the latest in gasket design, testing and global best practice is available to our customers.

Core Products:

1. Sheet jointing – A comprehensive range of Non-asbestos Calendered Sheet Materials and Compressed Fibre Jointing.
2. Uniflon – Modified and Expanded PTFE
3. Exfoliated Graphite Sheet and Reinforced Graphite Sheeting
4. Spiral Wound Gaskets
5. Kammprofile Gaskets
6. Ring Joint Gaskets
7. Soft Cut Gaskets
8. High Temperature Jointing
9. Compression Packing for Valves and Pumps
10. Flange Insulation Kits
11. Spray Covers
12. Industrial Rubber Sheeting

Specialized Products:

1. Spiral Wound: Lamons
   • WR-LC
   • WR-AB
   • WRI-HTG
   • WRI-LP
2. Heat Exchanger: Lamons
   • CMG-EX
3. Kammprofiles: Lamons
   • KAM-HTG
   • KAM-Manway
   • WRI-ORJ
   • WRI-PEG
4. Expanded PTFE: GORE™
   • GORE™ Joint Sealant
   • GORE™ 300/600 Tape
   • GORE™ UPG Gasket
   • GORE™ GR Sheet
   • GORE™ Pump Diaphragm
   • GORE™ Valve Stem Packing
   • GORE™ Sequel Packing
5. Thermiculite®: Flexitallic
   • Thermiculite® 715 and 815
   • Thermiculite® Spiral Wound Gasket
   • Thermiculite® Kammprofile Gasket

Specialized Services:

1. Training – Bolting Best Practices & Techniques.
2. Asset Reliability – On Site Hydraulic Bolt Torque.
3. On-site Selection and Repair Services.
4. Water-jet Profile Cutting.
5. Laser-jet Profile Cutting.

SPIRAL WOUND GASKETS

Spiral wound gaskets have the ability to recover under the action of fluctuating loads caused by process fluid pressure and temperature changes, flange face temperature variations, flange rotation, bolt stress relaxation and creep. The gasket sealing element consists of a pre-formed metallic winding strip with layers of a softer, more compressible sealing material which, during compression, is densified and flows to fill imperfections in the flange surfaces when the gasket is seated. The metal strip holds the filler giving the gasket mechanical resistance and resilience.

Gaskets can be manufactured from a range of filler materials according to different service conditions :

Spiral Wound Gaskets are available in a range of configurations and materials. Below are the most common gasket types.

Type CRIR

• Solid metal inner & outer ring
• Suitable for high pressure and temperature applications
• Raised face or flat flanges

Type CR

• Solid metal outer ring used as a centering device and compression stop.
• Used mainly on raised face and flat face flanges

Type RIR

• Solid metal inner ring
• High pressure & high temperature capability
• Male to female flanges

Type R

• Wide choice of materials for filler and metal strip
• Suitable for high pressure and temperature applications
• Recommended flanges – tongue & groove, male to female and flat face to recess

Graphite Filled

Applications:

• Used for a wide range of media including steam, oil, hydrocarbons and many chemicals
• Used for applications requiring high integrity sealing performance

Typical Properties:

• High pressure gasket designed for raised face and flat face applications
• Excellent tightness properties even under fluctuating load
• Inner ring protects windings against media and adds stability at higher pressures and for larger gasket diameters

Typical Specifications:

PTFE Filled

Applications:

• Used for applications demanding outstanding chemical resistance

Typical Properties:

• High integrity gasket designed for raised and flat face applications
• Resistant to virtually all chemicals
• Inner rings must be used with PTFE sealing material
• Inner ring protects windings against media and adds stability at higher pressures

Mica Filled

Applications:

• High temperature and high pressure applications

Typical Properties:

• High pressure gasket designed for raised face and flat face applications
• Excellent tightness properties even under fluctuating load
• Inner ring protects windings against media and adds stability at higher pressures and for larger gasket diameters

Winding strip and inner & outer guide rings are available in a wide range of metallic materials

SPIRAL WOUND GASKETS DIMENSIONS

(Dimensions to suit ANSI Standard Flanges)

SEMI-METALLIC GASKETS

METALLIC RING JOINTS

The following guidelines are designed to ensure the optimum performance of our gasket materials:

1. Choosing the Gasket
   There are many factors which must be taken into account when choosing a gasket material for a given application including the chemical compatibility, temperature and pressure. If you have any questions regarding the suitability of material for a given application, please contact TBJ Africa.

2. Gasket Thickness
   Gasket material should be as thin as possible. Increasing the thickness of the material decreases the load-bearing capacity of the material. Thinner materials also have better torque retention characteristics.

3. Flange Condition & Flange Surface Finish
   Ensure all remains of the old gasket material are removed and the flanges are clean and in good condition. We typically recommend a flange surface finish of 3 2μm (125μ”) to 6.3μm (250μ”) for our gasket grades when used on standard pipe flanges.

4. Gasket Compounds
   Ensure all soft cut gaskets are installed in a dry state – the use of jointing compounds is not recommended. Releasing agents such as grease or oil containing compounds are not required and can adversely affect the material, lowering the torque retention properties. To aid gasket removal, our manufacturers materials have an anti-stick finish.

5. Gasket Dimensions
   Ensure gasket dimensions are correct. The gasket should not intrude into the bore of the pipe-work and should be installed centrally.

6. Bolting
   Wire brush stud/bolts and nuts (if necessary) to remove any dirt on the threads. Ensure that the nuts can run freely down the thread before use. Apply lubricant with a known friction coefficient to the bolt threads, to the nut threads and to the face of the nut to be tightened.

7. Joint Assembly
   It is recommended that the bolts are tightened using a controlled method such as torque or tension, this will lead to greater accuracy and consistency than using conventional methods of tightening. If using a torque wrench, ensure that it is accurately calibrated.

ASME Spiral Gasket Dimensions

Download the dimensions table here