SPIRAL WOUND GASKETS

A - OUTER RING B - FILLER C - METAL STRIP D - INNER RING

Working conditions : pressure up to 25 MPa, temperature from -200°C up to 550°C Usage: flat flange gasket for severely fluctuating temperature and pressure conditions Standard sizes - raised face, male-female, tongue and groove flange - ASME/ANSI B16.5 flange, 150 to 2500 lbs, 1/2" to 24" N.B. according to gasket standard ASME B 16.20 (API 601) - ASME B 16.47 series A (MSS SP-44) flanges, 150 to 900 lbs, 26" to 60" according to gasket standard ASME B 16.20 (API 601) - ASME B 16.47 series B (API 605) flanges, 150 to 900 lbs, 26" to 60" according to gasket standard ASME B 16.20 (API 601) - BS 1560 and ASME/ANSI B 16.5 flanges, 150 to 2 500 lbs, 1/2" to 24" according to gasket standard BS 3381 - DIN flange - all types and sizes Construction profiles : - with or without inner or outer ring - with bars - standards (DIN, EN, BS, ASME) Non standard sizes and constructions Non standard sizes, materials and constructions are available on request. Standard fillers - expanded graphite: - 200°C to 550°C pH 0 to 14 - P T F E : - 200°C to 250°C pH 0 to 14 Standard metals : - outer ring - low carbon steel - paint or zinc plated finish - inner ring - SS 304, SS 316, SS 321 - winding strip - SS 304, SS 316, SS 321 Seating stress range:

Single-side enclosed Double-sides enclosed FILLER N/mm 2 seating stress + 20°C N/mm 2 seating stress + 20°C

Min. Opt. Max. Min. Opt. Max. GRAPHITE 50 90 180 50 122 300

P T F E 50 80 130 50 110 250 Recommended flange surface finish 3,2 to 6,3 µm Ra (125 to 250 RMS)

S T A N D A R D G A S K E T P R O F I L E S

FORIN SPW TYPE 2

The gasket consists of a sealing filler and V-shaped metal strip wound in combination. This profile is usually applied to male/female and tongue/groove flanges.

FORIN SPW TYPE 1 2

The standard spiral wound gasket format identical to TYPE 2, but fitted with an outer centering ring (applied to raised face flanges).

FORIN SPW TYPE 2 3

Spiral wound gasket for male/female flanges consisting of a wound component fitted with an inner ring to bring the gasket flush with the pipe bore to prevent to media - turbulence and also to protect the spiral from corrosive attack.

FORIN SPW TYPE 1 2 3

Identical to TYPE 12, but also fitted with an inner ring. The inner ring serves 2 purposes: 1. Prevents corrosive attack of the vulnerable spot welds. 2. Brings the gasket flush with the pipe - bore thus preventing turbulence.

M E T A L M A T E R I A L P R O P E R T I E S

Temperature (°C) Material AISI/ASTM Brief characteristic DIN

DIN specification

ČSN

min max

Carbon steel 238-C

The most used material for outer rings. The most economic suitable for the most application.

1.0038 RSt. 37.2.CS 11375 - 40 500

304 Good corrosion resistance, weld and could moldings properties.

1.4301 X5CrNi 18 17240 -250 550

304L Like SS 304, lower carbon content => better corrosion resistance in welds.

1.4306 X2CrNi 189 17249 -250 550

309 Heat resistant SS material with high content of Cr and Ni. Recommended up to 1150 °C

1.4828 X15CrNiSi

2012 17251 -100 1000

316 1.4401 X5CrNiMo

1810 17346 -100 550

316L 1.4404 X2CrNiMo

1810 17349 -100 550

316Ti

The most used material for inner rings and as metal strip. Suitable for aggressive applications (especially for acids). Recommended up to 400 °C.

1.4571 X10CrNiMoTi

1810 17348 -100 550

Stainless steel

321

Like SS304, with Ti content. Better inter- crystallization corrosion resistance. Recommended 400¸800 °C

1.4541 X10CrNiTi

189 17247 -250 550

F I L E R M A T E R I A L P R O P E R T I E S

S t a n d a r d f i l l e r s : GRAFIT is universally applicable, high-quality, asbestos-free material with the following characteristics: very good chemical resistance pH 0÷14, resistance to ageing, good gas tightness, up to 550 °C (oxygen up to 350 °C) and 25 MPa. Not suitable for aqua regia, oleum, nitric acid, 0 above 350 °C, Br, F, ClO 2, molten mass of KCl+KNO3, H2O2 PTFE is a high quality synthetic material with the following characteristics: excellent chemical resistance pH 0-14, resistance to 250°C, resistant to ageing, exc ellent gas tightness. Not suitable for liquid or solvents of Alkali metals, F. (elementary Fluor) and Fluorine Hydrocarbons. N o n s t a n d a r d m a t e r i a l s a r e a v a i l a b l e o n r e q u e s t.