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RESILIENT METAL SEALS PRODUCT GUIDE HTMS High Tech Metal Seals HTMS High Tech Metal Seals BLarenberglaan 5 2800 Mechelen BELGIUM High Tech Metal Seals

HTMS High Tech Metal Seals ^ Table of Contents ■ The Company 4 ■ Resilient Metal Seals Application Data Sheet 49

The Company High Tech Metal Seals (HTMS) is a privately owned company, founded in 1999 by a group of sealing specialists with a combined experience of more than 100 years. We design and manufacture elastic or resilient metal seals at our Belgian manufacturing plant in Mechelen. Our metal seals are unparalleled in terms of size, shape and performance across a broad spectrum of sealing applications. ■ Metal O-Seal ■ Spring Energised Metal O-Seal ■Metal C-Seal ■Spring Energised Metal C-Seal ■Spring Energised Aluminum C-Seal ■ Metal Oysterseal® ■ Metal Commaseal® HTMS' resilient metal seals are...

High Tech Metal Seals General Metal Seal Properties ■ Short Lead times ■ Procedure for rush production ■ Quick response time ■ Custom-made seaLing soLutions ■ Dedicated staff Production Capabilities ■ Seal diameter range from 5 mm up to 4 m ■ Cross sections from 0.79 mm up to 12.50 mm ■ Non-standard cross sections available on request ■ Shaped seals, race track, rectangular and other shapes on request ■ Tailor-made seals as per customer specifications ■ In-house plating and coating facilities ■ In-house heat treatment facilities ■ In-house Laboratory for testing purposes ■UnLimited sheLf...

Function of a Resilient Metal Seal Generic compression-decompression graph of a standard spring energised C-ring

Seal Dynamics The latter is outlined with the green coloured section of the The sealing performance of any elastic metal seal is based on decompression curve. the relative high specific contact load between the seal and the mating surface. This linear load or seating load is generated For safe operation the seal has to be maintained in the green by the reaction of the seal (with or without spring) against its section (line C-D) of the decompression curve. Depending on deformation by compressing the seal to a well-defined groove the number of variables it might be required to move point “D”...

Seal Selection Non-standard Designs Depending on the required tightness, the groove surface finish Resilient metal seals often have to perform under extreme and the media to be sealed, a specific plating or coating shall be conditions. Standard solutions as given in this catalogue may not selected. For a softer plating or coating, the seating load of a low always suffice these requirements. load C Ring may suffice to create the necessary stress to make the In case the application requires seal properties outside the scope selected plating material flow. In case of higher temperature or of...

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Considerations for Seal Selection The selection of the most suitable seal for any service condition is often a delicate trade-off between load and spring back of the seal. The higher the requested load to compress the seal the better the tightness level, whereas the useful spring back of the seal will determine how well this tightness will be maintained with varying temperatures and pressures. For a given seal cross section and seal type, it is generally true that with maximum load the spring back is lowest. And of course, a seal with minimum load will generate the highest spring back....

High Tech Metal Seals Flange Rotation / Lift-off In all cases, the goal should be to achieve a construction as rigid as possible to overcome movements (lateral and/or axial) caused by varying pressure and/or temperature changes and external loads. Flanges, bolts and seal can all be considered "spring elements" within the system of which the seal is often a highly non-linear element in its load recovery behaviour Therefore, an assembly where metal-to-metal-contact between flanges occurs after bolting is the most rigid and stable one. After the seal has been compressed in its groove,...

Surface finish The surface finish of the mating faces of the flanges is one of the most important parameters that will influence the performance of the metal seal. The surface roughness and the method of machining of both flange surfaces will have a huge impact on the leak rate of metal seal. For flange surfaces, it is of major importance that the surface is machined by a lathe resulting in circular machining marks. Methods of Machining For flange surfaces it is of the highest importance that this is done by turning ■ Surface finish will be noted as Ra-c - |pm| ■ Radial machining marks must...

Heat Treatment Heat treatment can improve the performance of metal seals. It will increase the yield strength of the material having its positive impact on seating load and spring back. The increased seating load will press the soft plating into the surface irregularities better, thereby creating a better leak tightness. The higher spring back means that the intimate contact between the seal and the mating surface is maintained longer in case of flange deflection and flange lift-off. In some cases heat treatment can be used to improve the seal's resistance to fatigue under cyclic loads....

Seal Overview CS-Type

High Tech Metal Seals The given leak values are always in controlled conditions, the leak rate always depends on the sealing load, groove surface finish, seal finish and design of the application High load seals are designed for high pressure and excellent tightness performance. When low load is required, soft platings and coatings are recommended to improve the leak tightness

Metal O-Rings - Internal Pressure: * Seal data based on Inconel® X-750 and only for O, OV and OG, NOT for OS-seals Load and spring back figures are based on Inconel® X-750 in the work hardened condition. 321 stainless steel will only generate 1/3 of the given Inconel figures. Actual load figures and to a lesser extent spring back can differ hugely from the given data. Tolerances on groove depth, plating, diametrical clearance and differences in material batches can create differences of up to 100% for the smaller cross sections, down to 50% for the bigger cross sections. For maximum...