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What does Fire-Safe mean when choosing a Gasket?

  In the process of gasket material selection, many inquiries point to the term “fire-safe”. Lets briefly look at the two most commonly used gasket fire testing methods: API 6FA & API 607. API 6FA: The American Petroleum Institute’s 6FA-re test is used to qualify valves for chemical process service.  The flange is assembled using proper bolt-up procedures and all parameters such as stress and torque are recorded. Thermocouples are mounted 1” away from the outside of the flange (Figure 1). The valve is enveloped in flame using four propane burners arranged symmetrically around the outside of the flange. The flame temperature should be 1400ºF to 1800ºF (average of the two thermocouples) for a burn period of 30 minutes from ignition. The temperature is maintained with no reading less than 1300ºF. An internal water pressure amounting to 75% of the flange rating is applied throughout the test and the leakage rate is continually measured. The test rig is then allowed t...

Which Removable Insulation Cover Materials to chose?

Flexible, removable insulation covers find application in heavy industries where swift or regular access to equipment is essential. These covers are crucial for insulating heat (or cold) to ensure safety, energy efficiency, and precision in industrial processes. A common inquiry revolves around the choice of fabric under specific circumstances. One pivotal factor to contemplate is whether the material is in direct contact with the equipment or exposed to external elements.   Presented below is a Decision Table to assist you in making informed choices:   Link We hope this table will facilitate your choice next time you require flexible removable cover insulation. Call Robco or Prodimax if you need further information.

Quel est le coût réel de l'installation d'un joint ?

Quel est le coût d'une fuite de vapeur ? Pour ce scénario, nous avons deux tuyauteurs : Doodley DoRight et Didley Doofus . Les deux employés travaillent dans des entreprises similaires en ville, avec exactement le même niveau d'expérience et de formation. Doodley DoRight accorde une grande importance à l'installation des joints dans son usine, tandis que Didley Doofus est fier de la rapidité avec laquelle il peut installer le joint et passer à la tâche suivante.   Vous trouverez ci-dessous une comparaison côte à côte de l'installation par Doodley & Didley de chaque joint dans la même application pour un seul raccord de bride boulonné et des coûts associés sur une courte période de 12 jours. Sur la base de ce scénario, voici quelques éléments à prendre en compte : L'installation correcte des joints prend initialement plus de temps, mais elle améliore votre retour sur investissement (ROI) - en augmentant le bénéfice d'exploitation par la réduction des temps ...

What Does Gasket Installation Really Cost ?

What Will a Steam Leak Cost? For this scenario, we have two pipe fitters: Doodley DoRight & Didley Doofus . Both employees work at similar companies in town with the exact same amount of experience and training. Doodley DoRight places a high degree of importance on the installation of gaskets in his plant, whereas Didley Doofus prides himself on how fast he can install the gasket and move on to the next task .   Below is a side by side comparison of Doodley & Didley’s installation of each gasket in the same application in a single bolted flange connection and the associated costs over a short, 12-day period. Based on this scenario, here are a few things to consider: Proper gasket installation is initially more time consuming but it improves your return on investment (ROI) – increasing operating profit by reducing overall downtime and gasket inventory requirements. This analysis is based on one 3” 150# bolted flange joint. Just think about how many bolted joints are in an ...

How to Simply Seal the Door of an Industrial Oven with a Tadpole Tape Gasket ?

  How to Simply Seal the Door of an Industrial Oven with a Tadpole Tape Gasket ? By: Jocelyn Vachon  VP Innovation Group - Robco There are a variety of types of industrial ovens with various door geometries. To seal the heat (radiation, convection, conduction) inside the oven, a flexible gasket is often required. Some ovens incorporate a groove to place an insulating rope. Also, strips or extrusions made of polymers from silicone or fluorocarbon can operate at relatively high temperatures. The most viable option, however, is a tadpole tape gasket. But, what is a tadpole tape gasket? What are the materials used ? A tadpole tape gasket consists of mineral-based textile materials (fiberglass, silica, ceramic) made into a seal starting with a core made of an insulating rope, surrounded by a sown fabric, the ends of which are allowed to extend (see graphic). A wire mesh can be added to the surface, to protect the fabric from excessive wear. Alternatively, a core of knitted metal wi...

Comment sceller simplement la porte d’un four industriel avec un joint à bourrelet (tadpole)

  Comment sceller simplement la porte d’un four industriel avec un joint à bourrelet (tadpole) Par: Jocelyn Vachon VP Groupe Innovation - Robco Il existe une panoplie de types de fours industriels avec des géométries diverses au niveau des portes. Pour sceller la chaleur (radiation, convection, conduction) à l’intérieur du four, un joint flexible est souvent nécessaire. Certains fours intègrent une encavure pour y placer une corde isolante. Aussi, des bandes ou extrusions en polymères de type silicone ou fluorocarbure peuvent opérer à des températures relativement élevées. L’option la plus viable demeure cependant un joint à bourrelet. Mais, qu’est-ce qu’un joint à bourrelet ?   Quels sont les matériaux utilisés ?  Souvent connu sous son nom anglophone de tadpole tape , le joint à bourrelet consiste à fabriquer à partir de textiles à base minérale (fibres de verre, silice, céramique) un joint, débutant avec une âme faite d’une corde isolante , sur lequel on entoure et ...

Pourquoi utiliser des joints spiralés ?

  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...

Quel est le pourcentage de compression approprié pour différents matériaux de joint ?

  Compression contre charge : que devez-vous utiliser ? Lotfi Grine, ing. – Spécialiste de produit chez Robco  Une question courante concernant l'étanchéité avec des matériaux de joint plat est le pourcentage de compression approprié ou/et la quantité de charge nécessaire pour les comprimer. Il s'agit d'un paramètre de conception critique. Ces deux paramètres peuvent affecter le nombre, le type, la taille et l'espacement des fixations telles que les boulons pour empêcher la déviation du boîtier, la rotation de la bride et les fuites ultérieures. Étant donné que plusieurs matériaux de joint sont constitués d'un composite, comme les matériaux de joint semi-métalliques ou joint aux feuilles calandré, c'est le niveau de couple (charge) plutôt que le niveau de compression du joint exprimé en pourcentage qui compte. Ce niveau de couple sera choisi en fonction de différents paramètres tels que la qualité des boulons, le type de bride, la contrainte d'étanchéité ma...

What is the proper compression percentage for different gasket materials?

  Compression versus Load: what should you use? Lotfi Grine, Eng. – Product Specialist at Robco One common question concerning sealing tightness with flat gasket materials is the proper compression percentage or/ and the amount of force needed to compress them. This is a critical design parameter. These two parameters can affect the number, type, size and spacing of attachments like bolts to prevent housing deflection, flange rotation and subsequent leakage. Because several gasket materials consist in a composite, like semi-metallic or compressed sheet gasket materials, it is the level of torque (load), rather than the level of gasket compression expressed in percentage that matters. T his level of torque will be chosen according to different parameters like bolts grade, flange type, maximum and minimum sealing stress, etc.  For Klinger compress sheets and gaskets, Robco uses KLINGERexpert software to assist users for improved scientific calculations of bolt torque requi...

Can flanges of various shapes be used together?

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).

Peut-on utiliser ensemble des brides de diverses formes ?

  Peut-on utiliser ensemble des brides de diverses formes ?   Lotfi Grine, Eng. – Spécialiste de produit chez Robco Les brides à face plate (flat face) ne doivent jamais être boulonnées à une bride à face surélevée (raised face). L'ASME B31.1 indique que lors du raccordement de brides en fonte à face plate à des brides en acier carbone, la face surélevée de la bride en acier carbone doit être retirée et qu'un joint d'étanchéité complet est requis. Cela permet d'éviter que la bride en fonte (un matériel fin et cassant) ne soit suspendue dans l'espace provoqué par la face surélevée de la bride en acier carbone.   Mais il existe une solution :   Si les brides ne peuvent être réusinées, ajouter un anneau central entre la bride à face surélevée et la bride à face plate. Cet anneau porte un côté avec une face surélevée et un autre côté avec une face plane, et utilisent deux joints d'étanchéité, préférablement de type Maxiprofile.

What gasket material should you use on sheet metal flanges for ventilation systems

What gasket material to use on sheet metal flanges for ventilation systems Jocelyn Vachon - VP B.Dev / Product Specialist Gasket materials require to be compressed, in order to achieve a seal. What materials should you use when flanges are simply made of thin sheet metal? Ventilation systems assembled on-site require gaskets between sections. Sheet metal flanges cannot create a high, evenly dispersed mechanical load on gasket materials, even if internal pressures are low (6 to 12 inch of water on average).   Here are a few suggestions: Closed cell sponges with a durometer of 20 to 60 (shore 00 scale) are good options Neoprene-based sponges (Robco SC-41 soft / SC-42 medium / SC-43 firm) are the most popular. Self-adhesive strips can be formed (round flanges) or cut in lengths (square flanges) for a quick and wasteless assembly PTFE saturated woven glass tapes (Robco GW-305) can be used where temperatures are above 250°F (130°C) and where a ...

Which stainless-steel grade is best for YOUR spiral wound gaskets?

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°...

High temperature gasket comparison table

High temperature gasket comparison Lotfi Grine, Eng. – Product Specialist at Robco High Temperature Gaskets Gaskets made from elastomers achieve a seal at minimum mechanical load, because of their intrinsic low porosity. Elastomers are also added to enable fibrous-based gaskets to achieve good sealability. However, even the best elastomers or polymers like silicone and PTFE cannot be used at continuous elevated temperatures, above 260°C (500°F), except for a few exotic and very expensive materials that can be used up to 325°C (650°F). What materials can you then choose from ? If we remove chemical resistance from the equation, it will depend mostly on 3 factors : maximum temperatures maximum pressure flange and bolting set-up. This table lists these factors for the various gasket materials available: Gasket Material Continuous Temperature Pressure Load to obtain a seal Sealability   ...