Archives :: Processing & Handling :: Liquid, Gas and Air Handling :: Piping & tubing

Displaying 101 - 120 of 135 stories.
March 28, 2011
Georg Fischer Piping Systems This firm’s trench machines are used for onsite fusion of plastic piping, and are now available in three versions: TM 160, 250 (photo) and 315. The key components of the fusion machine are the heating element, facer, clamping brackets...
March 28, 2011
Fr. Jacob Söhne A new hot-galvanized pipework system (photo) is now available with 3-mm wall thickness, which is specially designed for conveying bulk goods in outdoor areas. The standard hot-galvanized range...
February 1, 2011
Piping integrity is always a major concern in the chemical process industries (CPI), but the level of concern elevates when piping is buried underground. Soil conditions not only exacerbate general external corrosion, but also increase the difficulty and cost of inspection — a necessary step for ensuring safe and reliable operation. Making matters worse, many underground piping systems are...
February 1, 2011
Buried piping — especially lines carrying hydrocarbons — shoulders many more risks in terms of plant safety and environmental protection than aboveground piping does. Leaks in buried pipes are much harder to detect and, yet, are no less catastrophic. Ironically, underground piping design does not get as much emphasis in the chemical process industries (CPI) as aboveground piping does. Whether...
September 1, 2010
Polymeric piping systems have been used in well-defined segments of the chemical process industries (CPI) for decades. They have proven their sustainability to manage almost any chemical load up to temperatures of 100°C in the moderate pressure region ( p < 10 bar) if the choice of the respective piping-system material has been made correctly. However, their potential of exceptional performance is...
June 1, 2010
Incorporating fire safety into plant design takes on two fundamental goals: to prevent the occurrence of fire and to protect the initially uninvolved piping and equipment long enough for operations personnel to perform their duties and for emergency responders to get the fire under control. While it is impractical to completely eliminate the potential risk of an accidental fire in a complex process-plant...
January 1, 2010
Pipe sizing calculations include certain values that are time dependent, such as costs. While some costs rise, others decrease over time. It is the designers task to ensure that the total cost is minimized. For fluid flow calculations, heuristic criteria are often used, which is the main reason why these values must be updated from time to time. In this article, recommended velocities are updated for...
December 4, 2009
Parker Hannifin Tex-Flex fluorinated ethylene propylene (FEP) corrugated tubing (photo) can turn sharp corners without kinking. The manufacturer asserts that the tubing can handle bend diameters four times smaller than a typical...
December 4, 2009
The skirts on the new CE Series pipe caps are designed to stretch over the pipe edges while retaining their shape and tight fit...
November 1, 2009
Piping represents a major cost for projects in the chemical process industries (CPI). Larger pipe diameters increase upfront capital costs for a project, but the lower pressure drops afforded by large pipes mean less power is required to move the fluid through the pipe. Optimizing pipe diameter becomes an exercise in balancing the capital cost savings realized by using smaller pipes with the power required...
October 1, 2009
Corrosion is estimated to account for a significant portion — 8–10% — of total annual-plant-capital expenditures for the chemical process industries. To avoid it, engineers can consider corrosion-resistant plastics for process piping and storage vessels. Thermoplastics are generally resistant to chemical attack and thus suitable for many process applications. However, plastics must be...
September 1, 2009
There are many considerations when choosing piping materials for an industrial system. Historically, when options were more limited, the decision-making process was relatively straightforward. It was a matter of choosing what grade of metal to install. Today, there is a larger array of high-performance, non-metallic options to also consider. Chlorinated polyvinyl chloride (CPVC) is an example of a newer...
February 1, 2009
Friction Factor Fluid flowing through pipes experiences resistance due to viscosity, turbulence and roughness of the pipe surface. The Darcy-Weisbach Equation (1) is commonly used for the analysis of steady-state, Newtonian-fluid flow inside pipes. It summarizes the relations between frictional head loss, fluid properties, pipe geometry and discharge. For laminar flow (Re < 2,100), the friction factor...
January 1, 2009
In today’s fast track schedules for constructing new capital facilities, the process of designing, delivering and erecting piping often falls in the project’s critical path. This is particularly true for facilities constructed in emerging economies, where the facility generally resides in a remote location, posing significant logistical challenges. Squarely positioned in the center of the...
December 1, 2008
Laminar Pipe Flow For steady flow in a pipe (whether laminar or turbulent), a momentum balance on the fluid gives the shear stress at any distance from the pipe centerline. In Equation (1), Φ = P + ρ gz. The volumetric flowrate Q can be related to the local shear rate by doing an integration by parts of Equation (2). Newtonian fluid. For a Newtonian fluid, τ rx = µY rx, which gives the...
September 15, 2008
Look here for an Easy, Sturdy Compressed-Air Piping System Newly available in 76- and 100-mm dia., SmartPipe is a modular, aluminum piping system boasting a low friction coefficient due to its smooth, calibrated construction. With its full-bore fittings and push-to-fit, leak-free connectors the system can be installed without threading or welding — while still minimizing pressure drop and compressed...
June 15, 2008
This sixth and final part of a series of articles [ 1 – 5] on piping for process plants discusses practical issues of leak testing and verification of piping systems. Leak Testing Leak testing and pressure testing are often used synonymously. However, pressure testing is a misnomer when referring to leak testing of piping systems. By definition, a pressure test is the procedure performed on a relief...
April 15, 2008
  Water hammer — a high-pressure surge or wave created by the kinetic energy of the moving liquid — is not only a system issue, but primarily a safety concern. Understanding the nature and severity of water hammer in a steam-and-condensate system will allow prevention of its destructive forces. A better understanding will also help with the introduction of preventative measures into system...
April 15, 2008
  This fifth in a series of articles [1 – 4] on piping design discusses the practical issues of installation and cleaning. Pipe installation The installation of pipe follows its fabrication and is very frequently a part of it. The installation of pipe can be accomplished in the following four primary ways, or combinations thereof: Field fabricate and install Shop fabricate and field erected kid...
November 15, 2007
Make a leak-free seal, even for irregular flanges The proprietary Multi-Swell gasket material (photo) is said to be the world’s first self-loading, general-service gasket. The material creates its own load when it comes into contact with oil or water, which virtually eliminates the most common cause of gasket failure — insufficient load. The material performs equally well in water or oil, does...
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