An HVAC system includes a high-pressure subsystem and a low-pressure subsystem. After determining that refrigerant leak diagnostics should be performed, a controllable valve is closed between a condenser and compressor of the HVAC system. The compressor then operates until a predetermined input refrigerant pressure is reached. After the predetermined input refrigerant pressure is reached, operation of the compressor is stopped. After stopping operation of the compressor and waiting at least a predetermined wait time, the pressure in the low-pressure subsystem of the HVAC system is monitored. A rate of change of the pressure in the low-pressure subsystem is determined. If the rate of change is negative and a magnitude of the rate of change is greater than a threshold value, a leak location is determined to be in the low-pressure subsystem.

The invention relates to a hydraulic proof test assembly comprising at least a valve (1) with parallel seats (102). It comprises: a shut-off member (2) with parallel plates (20, 21), connected by connecting means for regulating their separation, to make them go from a first position in which this separation is sufficient to enable the shut-off member (2) to be introduced into said valve (1) to a second position where said separation is greater, this separation making it possible to apply them firmly against said parallel seats (102); a device (3) for inserting said shut-off member (2) into said valve (1) which comprises at least a “U” shaped tool, configured to be introduced into said valve (1), its parallel arms forming guides, while its base forms a support for retaining said shut-off member (2); a “dummy stem” (4).

The invention relates to a hydraulic proof test assembly comprising at least a valve (1) with parallel seats (102). It comprises: a shut-off member (2) with parallel plates (20, 21), connected by connecting means for regulating their separation, to make them go from a first position in which this separation is sufficient to enable the shut-off member (2) to be introduced into said valve (1) to a second position where said separation is greater, this separation making it possible to apply them firmly against said parallel seats (102); a device (3) for inserting said shut-off member (2) into said valve (1) which comprises at least a “U” shaped tool, configured to be introduced into said valve (1), its parallel arms forming guides, while its base forms a support for retaining said shut-off member (2); a “dummy stem” (4).

There is provided a method of calibrating multiple chamber pressure sensors of a substrate processing system. The substrate processing system includes: multiple chambers; multiple chamber pressure sensors; multiple gas suppliers configured to supply a gas to an internal space of the multiple chambers; multiple exhausters connected to the internal spaces of the multiple chambers via multiple exhaust flow paths; and multiple first gas flow paths. The method includes: acquiring a third volume, which is a sum of a first volume and a second volume; acquiring a first pressure change rate of the internal space of a selected chamber; calculating a second pressure change rate of the internal space of the selected chamber; and calibrating the selected chamber pressure sensor such that a difference between the first pressure change rate and the second pressure change rate is within a preset range.

There is provided a method of calibrating multiple chamber pressure sensors of a substrate processing system. The substrate processing system includes: multiple chambers; multiple chamber pressure sensors; multiple gas suppliers configured to supply a gas to an internal space of the multiple chambers; multiple exhausters connected to the internal spaces of the multiple chambers via multiple exhaust flow paths; and multiple first gas flow paths. The method includes: acquiring a third volume, which is a sum of a first volume and a second volume; acquiring a first pressure change rate of the internal space of a selected chamber; calculating a second pressure change rate of the internal space of the selected chamber; and calibrating the selected chamber pressure sensor such that a difference between the first pressure change rate and the second pressure change rate is within a preset range.

Embodiments of system and methods for supplying fuel, enabling communications, and conveying electric power associated with operation of a hydraulic fracturing unit of a plurality of hydraulic fracturing units are disclosed and may include a fuel line connection assembly configured to be connected to the first hydraulic fracturing unit and to supply fuel from a fuel source to a gas turbine engine connected to the hydraulic fracturing unit. A system also may include a communications cable assembly configured to be connected to the hydraulic fracturing unit and to enable data communications between the hydraulic fracturing unit and a data center or another hydraulic fracturing unit. A system further may include a power cable assembly configured to be connected to the hydraulic fracturing unit and to convey electric power between the hydraulic fracturing unit and a remote electrical power source or the plurality of hydraulic fracturing units.

Embodiments of system and methods for supplying fuel, enabling communications, and conveying electric power associated with operation of a hydraulic fracturing unit of a plurality of hydraulic fracturing units are disclosed and may include a fuel line connection assembly configured to be connected to the first hydraulic fracturing unit and to supply fuel from a fuel source to a gas turbine engine connected to the hydraulic fracturing unit. A system also may include a communications cable assembly configured to be connected to the hydraulic fracturing unit and to enable data communications between the hydraulic fracturing unit and a data center or another hydraulic fracturing unit. A system further may include a power cable assembly configured to be connected to the hydraulic fracturing unit and to convey electric power between the hydraulic fracturing unit and a remote electrical power source or the plurality of hydraulic fracturing units.

A syringe (1) comprises a barrel (2), a stopper (3) and a plunger (4). The barrel (2) has a hollow interior, an orifice (21) and an opening (22) opposite to the orifice (21). The stopper (3) is arranged in the hollow interior of the barrel (2) thereby defining a sealed chamber (5) in the interior of the barrel (2). The stopper (3) is displaceable in the interior of the barrel (2) thereby varying a volume of the chamber (5). The plunger (4) extends through the opening (22) of the barrel (2) into the hollow interior of the barrel (2). The plunger (4) has a distal end (41) outside of the barrel (2) and a proximal end (42) inside the hollow interior of the barrel (2). The stopper (3) has a distal face (31) directed towards the plunger (4), a proximal face (32) directed towards the chamber (5) and an internal cavity (33) opening at the distal face (31). The syringe (1) is equipped with a sealing structure sealing the cavity (33) of the stopper (3) such that the cavity (33) of the stopper (3) is microbiologically sealed.

A syringe (1) comprises a barrel (2), a stopper (3) and a plunger (4). The barrel (2) has a hollow interior, an orifice (21) and an opening (22) opposite to the orifice (21). The stopper (3) is arranged in the hollow interior of the barrel (2) thereby defining a sealed chamber (5) in the interior of the barrel (2). The stopper (3) is displaceable in the interior of the barrel (2) thereby varying a volume of the chamber (5). The plunger (4) extends through the opening (22) of the barrel (2) into the hollow interior of the barrel (2). The plunger (4) has a distal end (41) outside of the barrel (2) and a proximal end (42) inside the hollow interior of the barrel (2). The stopper (3) has a distal face (31) directed towards the plunger (4), a proximal face (32) directed towards the chamber (5) and an internal cavity (33) opening at the distal face (31). The syringe (1) is equipped with a sealing structure sealing the cavity (33) of the stopper (3) such that the cavity (33) of the stopper (3) is microbiologically sealed.

Apparatus features a signal processor or signal processing module configured to: receive signaling containing information about a central air-core of an overflow pipe of a hydrocyclone where fluid flow is concentrated in an outer annular region of the overflow pipe that is against an inner wall of the overflow pipe during a normal operation of the hydrocyclone; and determine corresponding signaling containing information about a collapse of the central air-core of the overflow pipe of the hydrocyclone during an abnormal operation of the hydrocyclone, based upon the signaling received. The signaling contains information about a fluid flow rate of the fluid flow by detecting a change in the magnitude of a force and/or a moment on the probe.