The purpose of using a torque wrench is to apply the target load for a specific amount of stress on a gasket. For any given combination of gasket, bolt and flange, a stress range will ensure that the gasket will seal while, at the same time, protecting from over tightening that may cause damage to one of these components.
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For a process pump in which liquids with chemical contents are pumped, damage to the seal can occur. The chemicals may cause damage on a standard seal. In many of these applications, a water-lubricated lip seal may eliminate this kind of damage.
A pressure seal is a valve design concept that offers distinct advantages when compared to a conventional bolted body-to-bonnet sealing mechanism. It uses the valve system pressure to provide sufficient forces against the valve body’s internal diameter (ID) and the bonnet surfaces. As the system pressure increases, the force on the pressure seal gasket also increases.
Multiphase pumps for crude oil are multifunctional. They reliably pump mixtures of crude oil, formation water and natural gas in vastly differing concentrations and compositions. The pump’s sensitive components include mechanical seals. These are generally equipped with complicated purging and lubricating systems to allow them to function without interruption, despite the multiphase mixture.
As operators of pumping equipment become more focused on the safety, reliability and environmental impact resulting from shaft seal leakage, dual mechanical seals have become more prevalent in the industry. A dual mechanical seal offers a second (outer) seal to contain the pumped fluid by creating a cavity or chamber between the inner and outer seal that can be filled with a fluid.
After nearly six years of intensive work, the American Petroleum Institute (API) 682 mechanical seal standard is soon to be adopted. Since its introduction in 1994, API 682 has become “the” standard that sets the global tone for the procurement and operation of seal and supply systems for centrifugal pumps in the oil and gas sector as well as in the petrochemical industry.
Making a correct braided pump packing selection can be a confusing and daunting task. Every manufacturer has its own engineering specifications and features that the user must consider when making these decisions. What criteria should the end users include when making this choice, and how can they get the maximum performance from their packing?
The markets for pumping systems are seeing an ever-increasing focus on energy efficiency in an effort to reduce carbon emissions, resource usage and costs of operation. Industrial pump system users have heightened their focus on efficiency initiatives as natural resource and raw material usage costs increase. External drivers include the U.S.
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Couplings play a critical role in wastewater processing. Take a look at how one wastewater facility combated coupling failure from exposure to UV radiation.
Multiphase pumps for crude oil are multifunctional. They reliably pump mixtures of crude oil, formation water and natural gas in vastly differing concentrations and compositions. The pump’s sensitive components include mechanical seals.
Today's technology has still not perfected reduced contamination sources from mechanical seals. In sanitary pharmaceutical applications, gas seals and "carbon free" seal technologies are becoming more common. New technologies and sealing methodologies are needed to address additional pharmaceutical concerns.
You ultimately choose whether you send your used seals to the Seal OEM or to a non-OEM repair shop.
A discussion of current compression packing technology will help set the stage for an example of how this can be accomplished. Compression packing is still widely used to seal rotating equipment such as pumps.
Proper installation and adjustment can make the difference between the success and failure of a packed pump. By keeping in mind the fine points of a few key principles, the chances of success are greatly increased.
The storage of mechanical seal assemblies, whether in an as received or in service condition, requires practices that prevent deterioration of critical sealing properties. Exposure to process and flush fluids can limit shelf life and reuse of some elastomeric secondary seal and gasket materials, depending on type and length of exposure.
In my opinion, the system curve is the single most important component of the pump selection process. After all, the system curve determines the operating point on a pump’s performance curve.
During my time in New Orleans for the Siemens Automation Summit, I had the opportunity to tour Louisiana Sugar Refining, LLC (LSR) in nearby Gramercy, La. In Louisiana, sugar is a big business.