sealing products
 

Heat Exchanger or Metal Jacketed Gaskets


Properties and application :


Heat Exchanger Gasket is the gasket that is used in exchangers .The make up of the gasket or type varies due to the operating conditions of the exchanger. Metal Jacketed Gaskets consists of a Metallic outer shell with either a Metallic or non-Metallic compressed fiber filler. The filler material gives the gasket resilience, while the metal jacket protects the filler and resists pressures, temperatures and corrosion.

Metal-jacketed gaskets are particularly suitable for sealing flat surfaces of heat exchangers, gas pipes, cast iron flanges, and autoclaves and similar. By their sealing efficiency, provided by exerting strong pressure on circular rims of the flanges, metal-jacketed gaskets can stand up to 30 % of deviation from the initial thickness, which is very useful in case of irregular or faulty flange rims. The chemical compatibility of the metal and the medium being sealed should be considered.

These Gaskets are made in a wide variety of sizes and shapes. Combinations of metal strip and filler are selected to suit the specific fluid media and operating conditions.

Operating temperatures from cryogenic up to 1000°C.
System pressures from high vacuum to over 35MPa/350bar.
Support rings - inside and/or outside the spiral - make gaskets suitable for high pipeline pressures on flat or raised flange faces.

Advantages

  • Suitable for high assembly stress.
  • Highly resistant against blow-out.
  • Quick to install and remove.

Shape and construction

Metal-jacketed gaskets are produced in several types to meet the requirements of the most demanding applications.

STYLES AND APPLICATIONS :


STYLE 200 :


The style 200 is a round single jacket gasket. Used in applications where the seating stress and width are limited. It can be manufactured in circular or oval shape. The maximum gasket width is 1/4 (6.4 mm) and the standard thickness is 3/32 in (2.4 mm).


STYLE 210 :


The style 210 is a flat double jacket gasket. Its most typical applications are in Heat Exchangers. ASME B 16.20 shows the gasket dimensions for ANSI B 16.5 flanges. The standard thickness is 1/8 in (3.2 mm). This style is used in large size reactors in chemical plants. As well as for flanges in the large, low pressure ducting in Steel Mill Blast Furnaces. To compensate for distortions and irregularities of these flanges gaskets have the thickness from 5/32 in (4 mm) to 1/4 in (6 mm).


STYLE 220 :


This is Similar to style 923 but the Metallic jacket is corrugated. The corrugations act as a labyrinth.


STYLE 230 :


Similar to style 220 with a grooved Metallic filler. Used in applications where it is necessary to have a gasket without non-Metallic materials, temperature limits and chemical resistance depend upon of the metal only.

Style 240 :


This is Double shell jacketed gasket constructed of two reversed wrap-round shells. This provides superior
flange support and easy handling as well as provides better resistance to high pressures.

Style 250 :


These are solid metal and solid profile heat exchanger profiles.


DESIGN

The following recommendations are based on successful practical applications: Gaskets confined by the inside and outside diameters:Gasket inside diameter = groove inside diameter plus 1/16 in (1.6 mm).


• Gasket outside diameter = groove outside diameter less 1/16 in (1.6 mm).


Gaskets confined by outside diameter:
• Gasket inside diameter = flange inside diameter plus a minimum of 1/8 in (3.2 mm).
• Gasket outside diameter = groove outside diameter less 1/16 in (1.6 mm).


Non confined gaskets:
• Gasket inside diameter = flange inside diameter pIus 1/8 in (3.2 mm).
• Gasket outside diameter = bolt circle diameter less bolt diameter.


Maximum operating temperatures of facing materials :

XA Compressed non-asbestos fibre: 500°C.
SPG Standard purity graphite (oxiding media): 500°C.
SPG Standard purity graphite (inert/reducing media): 600°C.
SPG Standard purity graphite (steam): 650°C.
HPG High purity graphite (oxidising media): 500°C.
HPG High purity graphite (inert/reducing media): 600°C.
HPG High purity graphite (steam): 650°C.
Fluolion® PTFE: 260°C.
HTF High temperature filler: 1000°C.
Aluminium and lead are also available.
Operating pressure :

“ PerfectSeal ” gaskets seal up to 35MPa/350bar, although higher pressures can be considered. Please consult our Technical Support Team when considering higher pressures.
Metal winding strips
Standard materials: Stainless steels 304L, 316L.
Alternative materials:
Stainless steels 310, 320, 321.
Monel 400, K500.
Nickel 200.
Inconel 600, 625, X750.
Incoloy 800, 825.
Hastelloy HB2, C276.
Titanium.
Support rings
Standard material: Carbon steel.
Alternative materials:
Stainless steels 304L, 316L, 320, 321.
Monel 400, K500.
Nickel 200.
Duplex UNS 31803.
Titanium.
PTFE (inner rings only).
Sizes :

Nominal Compressed Minimum Maximum
thickness thickness diameter diameter
2.5mm 1.9/2.1mm 10mm 300mm
3.2mm 2.4/2.6mm 10mm 760mm
4.5mm 3.4/3.45mm 10mm 1520mm
7.3mm 4.7/4.9mm 60mm 3550mm

How supplied :

Almost any combination of component materials is available. Profiles include circular, obround, square, oval and diamond. Gaskets for non-standard flanges are made to order. Jacketed gaskets are normally available with a non-asbestos high temperature filler. The standard filler is normally sufficient for applications up to 900º F. Other soft fillers are available for higher temperatures or special applications including Graphite . Standard metals used to make jacketed gaskets, regardless of the type, are aluminum, copper, the various brasses, soft steel, nickel, Monel , Inconel and stainless steel types 304, 316, 321, 347, 410, 502. Obviously the choice of the metal used for the jacketed part of the gasket would depend upon the corrosive conditions being encountered.
Sealing Technologies Standard Heat Exchanger Gasket Configurations :
Types : ST-A , ST-B and ST-C

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