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SPIRAL WOUND GASKET: A ‘V’ formed metal strip is alternately wound along with soft filler strip on the outer edge of winding mandrels.

2. In the winding process, the alternating plies are maintained under pressure.

3. The external & internal peripheries are held together by spot welding after achieving the required dimensions.

Function of SPW Gasket : Upon compression, the soft graphite filler material flows into the flange imperfections and creates a tight seal\

A Spiral wound gasket for flanges feature a metal sealing element filled with graphite, PTFE, ceramic fibers and, non-asbestos fibers (fillers). For this reason, spiral wound gaskets are classified as “semi-metallic” gaskets

SPIRAL WOUND GASKET SPECIAL  FEATUERS

• When High Pressure & Temperature requirements.
• Heavy Radial Forces.
• For heavy pulsating applications & vibrations.
• Variable & uneven loading on flanges Maintains seal under most exacting conditions.
• From cryogenic to 800°C. ( - 200°C to 1000°C )
• Pressure – Vacuum to 450 Bar.
• Quick and simple to fit.
• Will not cause corrosion.Will not adhere to flange face when open.
• Can often be used when other gaskets have failed

UNI KLINGER LIMITED is offering a full range of spiral wound gasket ,Spiral Wound Gasket manufactured to the Most exacting International standard  Such as API 601,ASME B16.20 ASME B16.47 A & B SERIES ,DIN ,British Standard ,JIS standard  and others as specified

Superior quality of UKL spiral wound gasket meeting International standard is achieved by means of imported computer controlled  winding machines ,which ensure total repeatability in such critical area as

Winding profile

Tension of winding

Winding pressure

Number of primary, Secondary ,and tertiary winding

Number of weld Point

Weld penetration

All of these factors are vital for control of manufacturing spiral wound gasket for critical service application

UKL spiarlwound gasket are subjected to compressibility and recovery test as per IS 7719 and salability test are conducted at ambient /elevated pressure and temperature

Spot welding normally secures the inner and outer ends of the strip that wrap the filler material; the gasket is contained loosely in an outer backing ring. Many SW gaskets for critical applications also include an inner guide ring, which gives the gasket a greater resistance to thermal shock, and in the case of vacuum service, it prevents the filler material from being sucked inside the pipe. Inner rings should be used with spiral wound gaskets on male-and-female flanges, such as those found in heat-exchanger, shell, channel, and cover-flange joints

Gasket thickness : 3.2 mm/4.5 mm/6.4 mm/7.2mm

Flange type : Spiral wound gasket are normally used on RFWN Flanges if used on SO Flanges ,this should be

stated as special gasket sizes will be requierd for NPS up to 11/2 inches

Spiral Wound gasket are typically used on intermediate pressure system and will be found on Class 300 Flange ,class 600 Flange /Class 900 flange

Components of Spiral wound Gasket :

INNER RING CS/SS304/316/410/MONEL/NICKEL/INCONEL /TITANIUM ,INCONEL 600/625

OUTER RING : CS/SS304/316/410/MONEL/NICKEL/INCONEL /TITANIUM ,INCONEL 600/625

METAL WINDING MATERIAL :

SS304/316L/321/MONEL400/NICKEL200/INCOLY800/825 /TITANIUM/HAST ALLOY / ,INCONEL 600/625

Filler material can be graphite, PTFE, ceramic or Non Asbestos other material depends on the service of the fluid

TYPE : R  ( Tongue and Groove & Flat Face to recess )

TYPE : CR ( Raised  Face &Flat Face )

TYPE : CRIR ( Raised  Face &Flat Face )

TYPE : RIR ( Male to female )

Spiral wound ring gaskets are also used in tongue-and-groove flanges. When used in this type of flanges there will be no inner and outer metal rings as gasket are fit inside the groove

NPS and Flange Pressure Class : A class  and nominal pipe size must be specified and must watch that of the flange concerned ,the class and size of the gasket will be stamped on the outer ring

Marking Requirements

Manufacturer

Manufactured to ASME B16.20

Winding metal and filler material

Nominal pipe size

Pressure class

Inner Ring Material

Colour Coding Requirements

Colour Coding identifies windings and filler material.

Continuous colour around outer edge identifies the winding alloy.

Stripes identify the filler material

Colour Coding and abbreviation for Spiral

Carbon steel               CRS                      SILVER

304 SS                          304                    YELLOW

304 L SS                       304 L                 NO COLOR

309 SS                          309                    NO COLOR

310 SS                          310                    NO COLOR

316 L  SS                      316 L                GREEN

317 L SS                      317                    MAROON

321  SS                        321                   TURQUOISE

347 SS                        347                    BLUE

430SS                         430                   NO COLOR

MONNEL 400            MON                  ORANGE

NICKEL 200               NI                      RED

TITANIUM                  TI                      PURPLE

HAST ALLOY B        HAST B             BROWN

HAST ALLOY C       HAST C             BEIGE

INCONEL 600         INC 600             GOLD

INCOLY 825           IN   825              WHITE

FILLER MATERIALS

PTFE                                                    WHITE STRIPE

VERMICULATE                                     LIGHT BLUE STRIPE

FLEXIBLE GRAPHITE                          GRAY STRIPE

CERAMIC                                              LIGHT GREEN STRIPE

DIMENSION OF SPIRAL WOUND GASKET T

GASKET IN ACCORDENCE WITH ASME B16.20 – FLANGES ACCORDING TO ANSI B16.5 NOMINAL BORE :1/2 INCH TO 24 INCH

GASKET IN ACCORDENCE WITH ASME B16.47 SERIES A  – FLANGES ACCORENCE WITH MSS SP 44

NOMINAL BORE :26 INCH TO 60 INCH

GASKET IN ACCORDENCE WITH ASME B16.47 SERIES B  – FLANGES ACCORENCE WITH API 605

 NOMINAL BORE :26 INCH TO 60 INCH

GASKET  SUITABLE FLANGE IN ACCORDENCE WITH BS 10 TABLES NOMINAL BORE :1/4 INCH TO 24 INCH

GASKET  SUITABLE FLANGE IN ACCORDENCE WITH DIN &BS 4504   NOMINAL BORE :10  TO 3000

GASKET AND OUTER RING SIZES INACCORDANCE WITH 7719-1999 NOMINAL BORE :10 MM TO 600 MM

GASKET TO SUIT JIS FLANGES ,NOMINAL PRESSURE 10 K AND 16 K TO 20K

INNER RING ID – D1

SEALING ELEMENT ID :D2

SEALING ELEMENT 0D :D3

OUTER RING OD  :D4

Spiral Wound gasket are typically used on intermediate pressure system and will be found on CLASS 150  /Class 300 Flange ,class 600 Flange /Class 900 flange.

TECHNICAL FEATURES
Gasket Compression & Choice of Thickness
Because of their “in-built” resilience UKL Spiral Gaskets are capable of giving an excellent seal over a wide range of flange surface finishes. To obtain their maximum service potential, we recommend UKL Spiral Gaskets should be loaded to the following compressed thickness.

NOMINAL THICKNESS                                OPTIMUM COMPRESSED THICKNESS
                                                                     
3.2mm ( 0.125”)                                              2.3mm to 2.5mm (0.090” to 0.100”)
4.5mm (0.125” to 0.135”)                                3.2mm to 3.4mm (0.125” to 0.135”)
6.40 mm ( 0.25”)                                             4.6mm to 4.9mm (0.180” to 0.195”)
7.20 mm ( 0.285”)                                           4.8mm to 5.0mm (0.190” to 0.200”)

Advantages of Uni-Klinger Spiral Wound Gasket

• Automated, computer controlled manufacture produces a spiral wound gasket with
• Greater Consistency
• Lower Emissions
• Perfect alignment