In order to provide a sealing device (15) for sealing a piston rod (8) of a reciprocating compressor (1), which provides good sealing properties at compressor standstill, which has a simple structure, which allows for a simple handling and which requires no external source of energy, the sealing device (15) comprises a number of first packing retainers (18), each retainer including a retaining opening (18a) in which a first packing ring (19) is arranged, a second packing retainer (20), including a retaining opening (20a) in which a second packing ring (21) is arranged, the second retainer (20) being positioned closer to the second axial device end (15b) than the number of first packing retainers (18) in an axial direction of the sealing device (15), wherein the second packing ring (21) is an uncut ring, comprising a continuous inner circumferential sealing surface (21a), wherein the second packing ring (21) is made from a material comprising a polymer, the material having a thermal expansion coefficient (), which is at least two times higher than the thermal expansion coefficient (FE) of iron, wherein at or below a defined activation temperature an inner diameter (d_i) of the second packing ring (21) is smaller than an outer diameter (D_a) of the piston rod (8) to be sealed, such that in the mounted state of the sealing device (15) in the compressor (1) the second packing ring (21) is prestressed in a radial direction in order to form a tight seal between the continuous inner circumferential sealing surface (21a) of the second packing ring (21) and the outer circumferential surface (8a) of the piston rod (8), wherein at a given operating temperature, the inner diameter (d_i) of the second packing ring (21) is larger than the outer diameter (D_a) of the piston rod (8), such that in the mounted state of the sealing device (15) in the compressor (1) the continuous inner circumferential sealing surface (21a) of the second sealing ring (21) is detached from the outer circumferential surface (8a) of the piston rod (8) in order to provide a leakage path past the second packing ring (21) in the axial direction.

A fluid end section which cools plunger packing during operation. The fluid end section uses a cooling sleeve that surrounds a portion of a fluid end housing and a stuffing box. A plunger packing is situated within the stuffing box. A cooling fluid may be circulated within a passage formed between the cooling sleeve and stuffing box so that it continuously cools components of the fluid end section during operation.

A monitoring apparatus for a pump test run of a sprinkler pump. The sprinkler includes at least one pump housing surrounding a wet chamber, a drive shaft arranged sealed against the pump housing by a gland packing, and a drive mechanically coupled to the drive shaft, the gland packing being configured and adapted for the passage of leakage fluid from the pump housing into a dry chamber. The monitoring apparatus includes a measuring unit adapted to detect the leakage fluid passing through the gland packing from the pump housing into the dry chamber during the pump test run, and is configured to generate a stop signal to switch off the sprinkler pump and/or an alarm signal if the flow rate falls below a predefined minimum.

Described herein is a packing box for mounting on a machinery shaft. In accordance with one aspect, the packing box housing defines a central opening for insertion of a movable machinery shaft with a hollow passageway surrounding the central opening to form a path for the flow of a fluid coolant. The passageway is provided with a fluid inlet port and a fluid outlet port opening onto the outer surface of the packing box housing, and it is formed by a single conduit or by a plurality of conduits obtained through additive manufacturing process and connected in series or in parallel to wound around the central opening.

A sealing system for a turbomachine bearing enclosure includes bearing with a stator carrying a rotor; a seal carried by the stator and surrounding the rotor; an external peripheral groove carried by the stator in the vicinity of the seal for collecting oil which exits the enclosure running along the rotor through the seal and which is centrifuged by the rotor towards this groove; and a drain at the bottom for discharging the oil from the groove. This groove is open towards the inside and is delimited by a base extended by two side walls, the side wall opposite the seal is extended by a skirt oriented obliquely towards the base to delimit a gutter opening towards the base.