A method of fabricating a conduit comprises steps of attaching a first first-tubular-outboard-ply-end of a first tubular outboard ply to a first inner collar portion of a first collar with a second weld and attaching a second first-tubular-outboard-ply end of the first tubular outboard ply to a second inner collar portion of a second collar with a fourth weld. The method also comprises steps of inserting a second tubular outboard ply into the first tubular outboard ply and inserting a tubular inboard ply into the second tubular outboard ply, so that the second tubular outboard ply is interposed between the tubular inboard ply and the first tubular outboard ply. The method further comprises steps of threadably interconnecting the first inner collar portion and a first outer collar portion of the first collar and threadably interconnecting the second inner collar portion and a second outer collar portion of the second collar.

A fire sprinkler system according to one aspect of the present disclosure includes a pipe having a first pipe portion and a second pipe portion. The first pipe portion includes a wall having a first wall thickness, and the second pipe portion includes a wall having a second wall thickness that is greater than the first wall thickness. The fire sprinkler system further includes structure coupled to the pipe and defining a sealed chamber between the structure and at least the first pipe portion, and a sensor for sensing a pressure in the sealed chamber. Example corrosion monitoring devices and methods for monitoring corrosion in pipe systems, including fire sprinkler systems, are also disclosed.

A monitoring device (118) for monitoring the leak-tightness of a vacuum-insulated system has a corrugated bellows (108) which is connected in terms of flow to an evacuated space (104) of the vacuum-insulated system in such a way that, in the event of an increase in pressure in the evacuated space, the length of the corrugated bellows (108) is adjusted beyond a threshold value. A position detector (113) connected to an energy store (115) responds to the change in length of the corrugated bellows and outputs a signal. The position detector outputs a signal to a display device (116), which provides an indication if a leak in the vacuum-insulated system occurs.

A conduit for transporting a fluid comprises a first collar, a second collar, and a bellows. The bellows comprises a corrugated inboard ply , a first corrugated outboard ply, an interstitial space, interposed between the corrugated inboard ply and the first corrugated outboard ply, and a second corrugated outboard ply within the interstitial space. The first corrugated outboard ply and the corrugated inboard ply are hermetically coupled to the first collar and the second collar. The conduit additionally comprises a first sensor, communicatively coupled with an interstitial space. The second corrugated outboard ply is not hermetically coupled to the first inner collar portion or the second inner collar portion.

An oil pipe assembly for a gas turbine engine. The oil pipe assembly includes a first pipe that defines a first fluid passage between an oil supply and a bearing chamber, and a second pipe that houses the first pipe and defines a second fluid passage between the first pipe and the second pipe that is supplied with cooling air. The oil pipe assembly also includes a restrictor that extends from the second pipe and restricts the passage of fluid from the second fluid passage before it flows into a breather. Pressure and temperature sensors) are located adjacent the restrictor to detect and measure changes in air pressure and air temperature adjacent the restrictor from which a controller identifies whether a leak has occurred in the first pipe or the second pipe. A method for detecting a leak in the oil pipe assembly, and a gas turbine are also described.

A diaphragm seal assembly, which includes a measuring instrument, a pressure being transmitted from a process side to be monitored, via an arrangement of two diaphragms having an evacuated intermediate space disposed therebetween, to the measuring instrument, reliably separated from the process side, the fatigue strength of the diaphragm seal assembly under extreme application conditions being improved.

A heat exchanging to exchange heat between a first fluid and a second fluid has a thermally conductive conduit with a double wall construction with an inner wall and an outer wall fixed thereto and defining a plurality of leak channels therebetween. Any fluid entering the leak channels is conveyed and detected to indicate a potential breach of the inner wall or outer wall. One of the fluids may be warm waste water and the other fluid may be clean water under pressure to recover heat from the waste water. An interleaving baffle located in the fresh water conduit increases heat transfer.

A gaseous fuel feeding system having a fuel supply line enclosed by a barrier wall system such that the fuel supply line includes a primary flow channel for the fuel and a secondary flow channel around the primary flow channel inside the barrier wall system, and a valve having a first fluid passage and a second fluid passage arranged to extend through the valve. The valve is coupled between the first and the second fuel supply line sections, such that the primary flow channel in the first fuel supply line section is in controllable flow connection with the primary flow channel in the second fuel supply line section via the first fluid passage of the valve. The secondary flow channel is in continuous flow connection with the secondary flow channel in the second fuel supply line section via the second fluid passage of the valve.

The disclosure relates to an overpressure encapsulation system for explosion protection, comprising the following: a device (1), in particular a painting robot (1), an overpressure-encapsulated device housing (2) comprising a housing outlet (6) for discharging gas out of the device housing (2), a compressed air system (3, 4) for operating the device (1), said compressed air system (3, 4) being arranged within the device housing (2), a sensor assembly (7, 8, 9) for measuring at least one fluid variable (Q, PI, PA), and an analysis unit (11) which analyzes the fluid variable (Q, PI, PA) measured by the sensor assembly (7, 8, 9), in particular in order to detect a leakage of the device housing (2). The disclosure proposes that, when a leakage of the device housing (2) starts, the analysis unit (11) ascertains a remaining run time until a required maintenance operation or until a system failure on the basis of the measured fluid variable (Q, PI, PA) and/or detects a fault (14, 16) of the compressed air system (3, 4) on the basis of the measured fluid variable (Q, PI, PA). The disclosure further relates to a corresponding operating method.

A conduit (100) for transporting a fluid comprises a first collar (102), a second collar (103), and a bellows (108). The bellows (108) comprises a corrugated inboard ply (110), a first corrugated outboard ply (114), an interstitial space (126), interposed between the corrugated inboard ply (110) and the first corrugated outboard ply (114), and a second corrugated outboard ply (112) within the interstitial space (126). The first corrugated outboard ply (114) and the corrugated inboard ply (110) are hermetically coupled to the first collar (102) and the second collar (103). The conduit (100) additionally comprises a first sensor 116, communicatively coupled with an interstitial space (126). The second corrugated outboard ply (112) is not hermetically coupled to the first inner collar portion (106) or the second inner collar portion (107).