In an aspect a pipe coupling arrangement includes two end members, each having a pipe attachment end and a sealing end that engages the other's sealing end. Each sealing end includes radially inner and outer collars, which are radially separated by a pocket. When the sealing ends engage one another the pockets form a chamber. At least one seal member is positioned in the chamber. An alignment ring fits in the chamber, aligning the end members. A coupling pushes the end members towards each other, compressing the at least one seal member sufficiently to seal against fluid leakage. The inner collars engage one another while the outer collars of the end members are axially spaced apart by a gap selected to reduce to zero upon application of a selected clamping force on the end members, thereby limiting deformation of the outer collars.

A seal configured for use in a chiller refrigeration system is provided including a first flange and a second flange. The first flange and the second flange are coaxially aligned and in direct contact. The second flange includes at least one groove within which a first sealing mechanism and a second sealing mechanism are positioned. The first sealing mechanism and the second sealing mechanism are separated by a distance such that a chamber configured to receive a pressurized gas is formed between the first and second sealing mechanisms.

A seal configured for use in a chiller refrigeration system is provided including a first flange and a second flange. The first flange and the second flange are coaxially aligned and in direct contact. The second flange includes at least one groove within which a first sealing mechanism and a second sealing mechanism are positioned. The first sealing mechanism and the second sealing mechanism are separated by a distance such that a chamber configured to receive a pressurized gas is formed between the first and second sealing mechanisms.

A gasket is for an annular compact flange. The compact flange includes two joinable flange halves which are formed with contact surfaces facing each other, and at least one of the flange halves having an axial, centric bore. An annular gasket groove is arranged in each of the flange halves, which is arranged to sealingly receive a common gasket. The gasket groove has a proximal side and a distal side relative to the bore, the distal side, which is conical, forming a groove sealing surface against the gasket. The gasket, which seals at the groove sealing surface, is formed with a plate portion positioned between the contact surfaces.

A gasket is for an annular compact flange. The compact flange includes two joinable flange halves which are formed with contact surfaces facing each other, and at least one of the flange halves having an axial, centric bore. An annular gasket groove is arranged in each of the flange halves, which is arranged to sealingly receive a common gasket. The gasket groove has a proximal side and a distal side relative to the bore, the distal side, which is conical, forming a groove sealing surface against the gasket. The gasket, which seals at the groove sealing surface, is formed with a plate portion positioned between the contact surfaces.

A non-metallic flange isolation gasket kit sealing flanged pipeline connections and flanged vessel connections while providing electrical isolation protection between flanges suited for high-pressure and high-temperature cathodic protection applications is presented. The invention protects flange faces from media induced corrosion and mitigates flange rotation induced fatigue and failures. The invention comprises of a retainer, a seal, and a seal pre-load structural ring. The seal pre-load structural ring is inserted into the seal, and seal outer diameter surface is joined to the retainer inner diameter surface. A second embodiment comprises of a composite gasket blank, comprising of a retainer and a seal, and a seal pre-load structural ring. The seal outer diameter surface and the retainer inner diameter surface are joined by thermal fusion bonding. The invention may further comprise one or more gasket seating stress stabilizers and/or a centering ring. Tapered retainer upper and lower surfaces decrease flange rotation.

A non-metallic flange isolation gasket kit sealing flanged pipeline connections and flanged vessel connections while providing electrical isolation protection between flanges suited for high-pressure and high-temperature cathodic protection applications is presented. The invention protects flange faces from media induced corrosion and mitigates flange rotation induced fatigue and failures. The invention comprises of a retainer, a seal, and a seal pre-load structural ring. The seal pre-load structural ring is inserted into the seal, and seal outer diameter surface is joined to the retainer inner diameter surface. A second embodiment comprises of a composite gasket blank, comprising of a retainer and a seal, and a seal pre-load structural ring. The seal outer diameter surface and the retainer inner diameter surface are joined by thermal fusion bonding. The invention may further comprise one or more gasket seating stress stabilizers and/or a centering ring. Tapered retainer upper and lower surfaces decrease flange rotation.

A flange seal has a support body of a tough, hard material, and a sealing element of a rubbery-elastic material, that are interconnected in a single piece, the sealing element having a sealing edge that can be exposed to a medium to be sealed in a chamber to be sealed. In the state resulting from manufacture, the sealing element has cavities in the region of the sealing edge, which cavities vary in volume during use of the flange seal as intended.

A flange seal has a support body of a tough, hard material, and a sealing element of a rubbery-elastic material, that are interconnected in a single piece, the sealing element having a sealing edge that can be exposed to a medium to be sealed in a chamber to be sealed. In the state resulting from manufacture, the sealing element has cavities in the region of the sealing edge, which cavities vary in volume during use of the flange seal as intended.

A duct coupling system includes a first and second duct, a vibration attenuation system, a rigid ring, and a fastening system. The first duct has a first flange aligned with a second flange of the second duct. The vibration attenuating system abuts a first side and a second side of the first flange and abuts a first side of the second flange. A portion of the vibration attenuating system encircles the first duct. The vibration attenuating system is configured to attenuate vibrations passing between the first and second ducts. The rigid ring encircles the first duct and abuts the vibration attenuation system. The fastening system couples the first duct to the second duct and compresses the vibration attenuating system. The rigid ring does not contact the first duct and the first duct does not contact the second duct.