A method for removing fouling from a pipeline includes determining the location of fouling in the pipeline. Once determined, the method further includes installing a hot tap in the pipeline. A flex conduit is inserted into the pipeline through the hot tap and a treatment fluid is flowed into the pipeline through the conduit. The treatment fluid is used to remove the fouling from the pipeline. Once the fouling is sufficiently removed, the flexible conduit is removed from the pipeline.

A method for cleaning a coke deposit from an internal surface of a process equipment, comprising removing at least a portion of the coke deposit from the internal surface using a flexible pig comprising a plurality of bristles, without damaging a metal protective layer of the internal surface of the process equipment. A flexible pig for cleaning a coke deposit from an internal surface of a process equipment without damaging a metal protective layer of the internal surface, comprising a flexible body formed of a polymeric material, and a plurality of bristles partially encapsulated by the polymeric material of the flexible body.

A pig stopping device for stopping a pipeline inspection gauge in the receiving station of a pipeline is provided. The device provides a cylindrical frame sized to be inserted into the receiving station of a pipeline. The cylindrical frame includes a pair of opposing circular plates having inner surfaces connected by a plurality of elongated rods, thereby forming an interior volume within the cylindrical frame. The circular plates each comprise a plurality of apertures configured to allow the flow of liquid and debris therethrough and into the interior volume. A cage wraps around the exterior of the elongated rods, thereby enclosing the interior volume but allowing the flow of liquid therethrough. In this way, debris pushed into the interior volume of the pig stopping device by a pig or the flow of product in the pipeline is caught therein and prevented from flowing into a bypass line of the receiving station.

A pig stopping device for stopping a pipeline inspection gauge in the receiving station of a pipeline is provided. The device provides a cylindrical frame sized to be inserted into the receiving station of a pipeline. The cylindrical frame includes a pair of opposing circular plates having inner surfaces connected by a plurality of elongated rods, thereby forming an interior volume within the cylindrical frame. The circular plates each comprise a plurality of apertures configured to allow the flow of liquid and debris therethrough and into the interior volume. A cage wraps around the exterior of the elongated rods, thereby enclosing the interior volume but allowing the flow of liquid therethrough. In this way, debris pushed into the interior volume of the pig stopping device by a pig or the flow of product in the pipeline is caught therein and prevented from flowing into a bypass line of the receiving station.

The present invention provides pipeline pigs for maintenance of a pipeline, the pig including two adjacent ovular sections generally symmetrically disposed about a vertical axis, a polymeric band disposed along the vertical axis, the band being adapted to reduce a cross section of the pig along the axis and a longitudinal inner support member disposed centrally along the ovular sections and perpendicularly to the vertical axis.

The present invention provides pipeline pigs for maintenance of a pipeline, the pig including two adjacent ovular sections generally symmetrically disposed about a vertical axis, a polymeric band disposed along the vertical axis, the band being adapted to reduce a cross section of the pig along the axis and a longitudinal inner support member disposed centrally along the ovular sections and perpendicularly to the vertical axis.

A rubber ball cleaning multipoint centralized ball serving system for a condenser includes a condenser water chamber, a cooling water outlet pipe, a cooling water inlet pipe, a ball recovery net, a second isolating valve, a rubber ball pump, and a check valve. A water inlet end of the condenser water chamber is connected to a plurality of pulse ball serving valves. The plurality of pulse ball serving valves is connected to a ball adding chamber via a rubber ball transfer pipe. The rubber ball transfer pipe is connected to the cooling water inlet pipe via another pulse ball serving valve. The ball adding chamber is connected to the circulating cooling water outlet pipe via a hot water discharging pipe. The hot water discharging pipe is provided with a third isolating valve and a hot water discharging valve. A lower portion of the ball adding chamber is provided with a rubber ball discharge valve. The present system can reduce a quantity of the circulating cooling water that is heated during running of the rubber ball system and again enters the water inlet pipe of the circulating cooling water system, thereby improving a condenser circulating cooling effect. By oppositely and correspondingly operating a pulse ball serving valve and a hot water discharging valve to open or close, a great number of rubber balls are enabled to centrally enter the circulating cooling water inlet pipe and the condenser water chamber within a short time, thereby cleaning the condenser heat exchange pipe in full coverage.

Pigs (10) are propelled forwards by a propulsion fluid in a pipeline (21). The pigs (10) have an upstream end (13), a downstream end (11), and an intermediate section (12). The intermediate section has a variable geometry chamber (16) associated therewith and one or more outwardly extending external pawl teeth (15). The pawl teeth are automatically displaceable outwardly relative to a longitudinal axis (9) in response to a pressure differential between a downstream pressure and an upstream pressure. The pig is configured such that a change in a geometry of the chamber in response to the pressure differential between the downstream pressure and the upstream pressure causes the one or more pawl teeth to automatically displace outwardly when the upstream pressure is less than the downstream pressure. When the pawl teeth are deployed, upstream displacement of the pig is inhibited. Various related systems (5) and methods are also disclosed.

Pigs (10) are propelled forwards by a propulsion fluid in a pipeline (21). The pigs (10) have an upstream end (13), a downstream end (11), and an intermediate section (12). The intermediate section has a variable geometry chamber (16) associated therewith and one or more outwardly extending external pawl teeth (15). The pawl teeth are automatically displaceable outwardly relative to a longitudinal axis (9) in response to a pressure differential between a downstream pressure and an upstream pressure. The pig is configured such that a change in a geometry of the chamber in response to the pressure differential between the downstream pressure and the upstream pressure causes the one or more pawl teeth to automatically displace outwardly when the upstream pressure is less than the downstream pressure. When the pawl teeth are deployed, upstream displacement of the pig is inhibited. Various related systems (5) and methods are also disclosed.

A sewer cleaning apparatus which has a hollow cylindrical body propelled by a plurality of water jets with a clam shell opening on the front of the apparatus operated by a plurality of piston assemblies that are attached to the sides of the cylindrical body. The apparatus is propelled by high pressure water ejected from the apparatus in a rearward direction. The high pressure water operates the piston assembly opening the clam shell and provides forward thrust for the apparatus allowing the hollow bucket type object to trap solids inside apparatus.