Leader Spiral Wound GasketsHigh Integrity SPW Gaskets

Leader Spiral Wound Gasket Type S

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Description

Designed more than 100 years ago, Spiral Wound Gaskets (SWG’s) are widely used as high integrity and sustainable gaskets. The sealing element is manufactured from preformed, V-shaped metallic windings with intermediate soft sealing fillers. As standard metallic winding material SS316L is used and for the soft fillers, graphite, PTFE or LeaderTHERM NXT 1000 (high temp. modified Phlogopite). Due to the gasket construction, SWG’s offer high compressibility and recovery. Leader Style S SWG’s are provided with a sealing element only. The S gaskets are suitable for ASMEB16.5 tongue and groove or male / female (Spigot to Recess) flanges up to 2500lbs. They are mostly used in pumps and valves. Available also for Heat Exchanger applications.

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Product Data Sheet

Application

(Petro-) Chemical Industry, Steam, On- and Offshore exploration, pipeline systems, pressure vessels and exchangers.

Chemical Compatiblity

Spiral Wound Gaskets can be used in a wide variety of media, i.e. a pH range varying from 0-14. Application/ compatibility guide is available on request. Temperature from –450 °F up to 850 °F (steam up to 1200 °F)

Delivery Options

Standard style S gaskets are normally manufactured according to particular customer drawings, or by given sizes. Gaskets can be manufactured in a thickness of .125" / .175" / .250" / 285". Different materials are available.

Temperature

Approvals & Certificates

EN10.204 3.1

Sealing Characteristics

low leak rate
Firesafe
Design suitable for fluctuating temperatures and pressures
broad chemical resistance (pending on the metallic materials and filler)
wide seating stress range
blow out safe
non-sticking to the flanges

Technical Data
max Temperature [°F]	See material table below
max Pressure [psi]	ASME B16.5 2500 Class
Minimum initial stress [DIN E 2505 part 2] [N/mm2]	50
Maximum initial stress [DIN E 2505 part 2] [N/mm2]	300
M-Value	3
Y- Value [psi]	10000
Gasket required flange roughness [Ra micron]	3,2-6,3
Gasket required flange roughness [RMS]	125-250
Advice Seating stress at assembly [psi]	12500
ROTT [Gb]	926
ROTT [a]	0.341
ROTT [Gs"]	2.9

Leader Spiral Wound Gasket Type SRI

The sealing element with inner- and outer guide ring. The “SRI” SWG’s are manufactured with an inner, outer guide ring, sealing element – winding material(SS316L, SS321…) and the soft fillers - graphite, PTFE, LeaderTHERM NXT 100...

Leader Spiral Wound Gasket Type SI

The sealing element with inner ring. The “SI” SWG’s are manufactured with an inner ring, sealing element – winding material(SS316L, SS321…) and the soft fillers - graphite, PTFE, LeaderTHERM NXT 1000 (high temp. modified Phlogopi...

Leader Spiral Wound Gasket Type SR

The sealing element with outer guide ring. The “SR” SWG’s are manufactured with an outer guide ring, sealing element – winding material(SS316L, SS321…) and the soft fillers - graphite, PTFE, LeaderTHERM NXT 1000 (high temp. modif...