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Basic Hydraulics and Accessories
Published in Frank R. Spellman, The Science of Wind Power, 2022
The welded flange connection is a reliable means of connecting tubing components. The flange welded to the tube end fits against the end of the fitting. The locknut of the flange is then tightened securely onto the fitting. The compression fitting connection uses a ferrule that pinches the tube as the locknut is tightened on the body of the fitting. The flare fitting connection uses tubing flared on one end of the tubing that matches the angle of the fitting. The tube's flared end is butted against the fitting, and a locknut is screwed tightly onto the fitting, sealing the tube connection properly.
Water/Wastewater Conveyance
Published in Frank R. Spellman, Handbook of Water and Wastewater Treatment Plant Operations, 2020
The welded flange connection is a reliable means of connecting tubing components. The flange welded to the tube end fits against the end of the fitting. The locknut of the flange is then tightened securely onto the fitting. The compression fitting connection uses a ferrule that pinches the tube as the locknut is tightened on the body of the fitting. The flare fitting connection uses tubing flared on one end of the tubing that matches the angle of the fitting. The tube’s flared end is butted against the fitting, and a locknut is screwed tightly onto the fitting, sealing the tube connection properly.
Plants and Equipment
Published in Kenneth E. Heselton, Boiler Operator’s Handbook, 2020
An additional feature of the flexitube design includes a new way of connecting the tubes to the drums or headers; that construction is shown in Figure 10-27. The ferrule is a forged tapered plug bored to accept the tube and the tube is rolled into the ferrule instead of into the drum. They can also be welded together. To install the tube the ferrule is driven into a correspondingly tapered hole punched or drilled and reamed into the drum or header. Precise machining of the ferrule and drum provides a tight fit and the dog is used to clamp it in position for added security.
Servicing and installing equipment using flammable refrigerants: Assessment of field-made mechanical joints (ASHRAE RP-1808)
Published in Science and Technology for the Built Environment, 2020
The types of fittings selected for this study were press or crimp fittings, compression fittings, and flare fittings. Example images of the types of fittings are shown in Figure 1, while Table 1 lists the manufacturer-specified application parameters for each type of fitting used in this study. Press fittings create a seal by pressing a radial O-ring between the surface of a tube and a sleeve that is part of the fitting and that slides over the end of the tube, with the fitting held in place by forcing the tube and fitting together. Compression fittings create a seal by forcing a ferrule into a mating conical portion of the fitting union piece, with the tube held onto the fitting by a threaded nut. Flare fittings create a seal by forcing the flared end of a tube onto the mating angled portion of the fitting union piece, with the tube again held onto the fitting by a threaded nut. It can be seen from the table that all fitting types have sufficient pressure range for a typical HFC or HFO refrigerant system, while the temperature range also seems to be acceptable for all fitting types with the possible exception of the maximum recommended temperature of compression fittings. It is worth noting that press fittings and brazed joints are both permanent fittings, while compression and flare fittings are designed to be removable and reusable.