Robco Expert

  SELECTING AN OIL FOR A GEARBOX!   Thomas Cipriani – Product Specialist at Robco When selecting what oil to put into a gearbox we must consider 2 key items: Gear m etallurgy OEM spec ifications r equiring an oil with additives for : Extreme Pressure Rust & Oxidation W ith m etallurgy, t he main concern is with yellow metals (copper, bronze, etc..) Extreme Pressure o ils CANNOT be used as they will attack ing yellow metals. The gearbox OEM specs wi ll call for an oil with either Extreme Pressure additives (meant for heavily loaded bearings) or an oil with Rust & Oxidation additives (most commonly used in gear reducers). The wrong oil in the gearbox will cause premature failure of the gears, so please make sure to verify before switching or selecting your gearbox oils!

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   ...

  Top 5 Differences Between More Traditional Extruded Nylon and Cast Nylon Thomas Cipriani – Product Specialist at Robco 5 – A cast nylon material inherently has less stress than extruded nylon ,  which then allows it to handle higher levels of impact 4- Lower moisture absorption gives cast nylon a higher dimensional stability than extruded nylon which then allows it to be used in more humid applications with less concern for dimensional change which would then change the characteristics of the nylon 3 – The more crystalline structure of cast nylon gives it a higher strength than extruded nylon   therefore allowing it to have a higher tensile, flexural and compressive resistance  2 – Cast nylon is available in smaller diameter rod than extruded nylon  is when looking at premium bearing grades  therefore giving you more dimensional options for rods 1 – Cast nylon has a 20 degree higher operating temperature than extruded nylon   allowing it to handle hi...

Top 12  Performance Advantages of Using Royal Purple with Synerlec Additive Technology Thomas Cipriani – Product Specialist at Robco Higher Film Strength > allowing it to reduce wear by carrying loads 5 times greater than other premium synthetic and mineral oils. All equipment runs on a very thin film of oil ...the tenacity and toughness of the Synerlec film greatly reduces wear and extends equipment life. High Temperature Stability > due to it’s Synerlec additive technology and it’s PAO base oil it enhances the oil’s capability to withstand higher temperatures for longer periods. Low Friction Coefficient > due to it having a tenacious, tough, synthetic film that allows surfaces to “perfectly mate” through controlled polishing of the micro-asperities. Smoother surfaces reduce friction, vibration and lower “unit pressures” (psi) to extend equipment life. Superior Water Separation > allowing the oil to separate rapidly from water to remain dry. Dry oil gr...

Junction with leak problem, Should I suspect the fastener device...? Jocelyn Vachon - VP Busines development - Robco Uneven Bolt Stress. An incorrect bolt-up procedure or cramped working conditions near the flange can leave some bolts loose while others are overtightened and crush the gasket. This can cause in-service leaks, especially in high temperature services when the heavily loaded bolts relax. in order to close the micropores inside the gasket itself and to fill in the unevenness at the flange facing - gasket interface, the assembly bolt load should be calculated according to the ASME Code. Every bolt has a correct torque/tension elasticity range and a properly tensioned bolt works at its optimum efficiency. If the tension is too low, the nut could vibrate or work loose and if the tension is too high (overstretched), the bolt may yield. That being said, we strongly encourage you to Choose the proper fastener device (Bolts, nuts and washers) for example use a hardened washe...

One major reason your joints may be leaking... and it is not the gasket. There are a number of reasons that contribute to a seal joint failure, including weak bolt material, improper installation, inadequate bolting torque or poor flange design. Yet, if a joint fails and leaks, the immediate culprit will usually be the... gasket. Perhaps, a flange inspection would be the first analysis to do Flange face damage is an important parameter that may restrict a gasket to seal properly.  We need to take this into consideration when we analyze the sealing failure of a junction. Among flange face damages, we can find: Scratches: This type damage is narrow and elongated with sharp, shallow bottoms. However, depending on the force that created them, they can be deep. Frequently, this type of damage is created by a sharp object dragging across the flange face. These objects may include the bristles of a wire brush or a tool, such as a chisel. Gouges: These are wide and elongated with ...