Robco Expert

Why use spiral wound gaskets ? Lotfi Grine, Eng. – Product Specialist at Robco Many types of industrial gaskets can be found in the field. Yet, the 2 most popular types of gaskets found are Spiral Wound Gaskets (SWG) and gaskets cut from calendered sheets. SWG are manufactured by spirally winding together a ‘V’ shaped metallic strip and a soft filler, generally g raphite. Calend e red S heet G askets are cut from sheets, which are manufactured by mix i ng, pressing and curing a composite of high temperature and chemically-resistant fibers, fillers and elastomers . Although in some cases, both type of gaskets can be used interchangeably, i t’s essential to choose the right gasket according to the application details. Why would you choose spiral wound gaskets? Benefits of Spiral Wound Gaskets SWG are capable of handling a significant part of the oil and gas industry applications . Below, we list some of advantages of spiral wound gaskets, so you can make a more informed decisi...

  Pourquoi utiliser des joints spiralés ? Lotfi Grine, ing. – Spécialiste de produit chez Robco On peut trouver de nombreux types de joints industriels sur le terrain. Cependant, les deux types de joints les plus populaires sont les joints spiralés (SWG) et les joints découpés dans des feuilles calandrées. Les SWG sont fabriqués en enroulant en spirale une bande métallique en forme de "V" et un matériau de remplissage souple, généralement du graphite. Les joints en feuilles calandrées sont découpés dans des feuilles fabriquées en mélangeant, pressant et durcissant un composite de fibres, de charges et d'élastomères résistant aux hautes températures et aux produits chimiques. Bien que dans certains cas, les deux types de joints puissent être utilisés de manière interchangeable, il est essentiel de choisir le bon joint en fonction des détails de l'application. Pourquoi choisir des joints spiralés ? Avantages des joints spiralés Les joints spiralés son...

Can flanges of various shapes be used together? Lotfi Grine, Eng. – Product Specialist at Robco Flat face flanges should never be bolted to a raised face flange. ASME B31.1 states that when connecting flat face cast iron flanges to carbon steel flanges, the raised face of the carbon steel flange must be removed and a full gasket is required. This is to prevent the cast iron flange (a thin, brittle material) from hanging in the space caused by the raised face of the carbon steel flange.   But there's a solution: if the flanges cannot be remanufactured, add a center ring between the raised face flange and the flat face flange. This ring carries one side with a raised face and another side with a flat face, and uses two gaskets. (Preferably a Maxiprofile type for the raised face).

Choosing the right type of stainless-steel grade to use for spiral wound gaskets is important. Lotfi Grine, Eng. – Product Specialist at Robco The media concentration, temperature and time requirements provide a variety of work conditions for spiral wound gaskets.   The metal components are subject to different types of attack, including pitting, cracking, stress corrosion cracking and intergranular corrosion. It’s important to specify, that the standard stainless-steel used for Robco SWG is normally Type 316L . Other high quality alloys are available (ex : hastelloy, inconel, monel, etc.) for higher temperature or other special applications Here are the particularities of stainless-steel grades used generally in the manufacturing of spiral wound gaskets: Stainless steel type 304 serves a wide range of applications. It resists organic / inorganic chemicals. The main limitation of Type 304 is stress corrosion cracking and intergranular corrosion when the temperature exceeds 800°...