Spiral Gaskets
Metal Jacketed Gasket
   
 
 

The Spiral Wound Gaskets are composed of a metallic continuous stripe with a special shaped profile, coupled with a continuous filing stripe (Asbestos, PTFE, Grafoil, Ceramic etc) evenly wound in concentric spiral under constant stress. The Spiral Wound Gaskets are reinforced on the inner and outer diametre by winding of several electrically welded spiral metal only.

The main property of Spiral Wound Gasket, owing to elastic action of the special metallic stripe profile, is that of offering a perfect sealing under all fluctuating pressure and temperature conditions, also where temperature excursion has considerable value, maintaining tightening elastic recovering. This elasticity can be modified by a proper selection of components, and they can be installed even with flanges at standard working with lightly pitted or buckled by the use of flanges. A proper selection of materials (both metal and fillers) allows to adequate the spiral gasket to the most various operating conditions.

The normal shape is circular but it is possible to make oval shape, oblong shape. They can also be combined with jacketed gaskets to tightening heat exchangers internal shapes

Spiral Gaskets are manufactured in following types:

Type BR Spiral Without Inner And Outer Ring Suitable For Groove Flanges
Type BCR Spiral With Only Outer Ring Used As Centering Device And Compression Stop - General Applications.
Type BRIR Spiral With Only Inner Ring Used As A High Pressure Temperature Capability - For Groove Flanges And General Applications
Type BCRIR Spiral With Inner And Outer Ring Of Solid Metal For High Pressure And Temperature Applications. Prevents Damage to The Gaskets Bore And Inner Windings - Acts As A Heat And Corrosion Barrier - Application As General And Critical Duties
Type BHTX Spiral With Inner Or Outer Or With Partition Ribs Acts As A Pass Bars. Manufactured To Customer Design
     
The material of construction of Spiral Wound Gaskets are as per annexure
Annexure
 
Filler Material Recommended Maximum Temperature ASME B16.20 Color Coding
Graphite 550o c Grey Stripe
PTFE 260o c White Stripe
Non Asbestos/CAF 350o c White/Pink Stripe
Ceramic 650o c -

Winding Material  Recommended Maximum Temperature ASME B16.20 Color Coding
304 Stainless Steel 650o c Yellow
304L Stainless Steel 650o c Yellow with Red Strip
316/316L Stainless Steel 650o c Green
316Ti Stainless Steel 650o c Light Blue
347 Stainless Steel 650o c Blue
321 Stainless Steel 650o c Turquoise Blue
Monel 400 600o c Orange
Nickel 200 600o c Red
Titanium 350o c Purple
Hastelloy B-2   450o c Brown
Hastelloy C-276 450o c Belge
Inconel 600 950o c Gold
Inconel 625 450o c Gold
Inconel X-750 1000o c Light Grey
Incoloy 825 450o c White
Spiral Wound Gaskets as per ASME B16.20-1998 Used With ASME/ANSI B16.5 Flanges