The present invention relates to a method and apparatus for cleaning an oil and gas well riser section or assembly. Even more particularly, the present invention relates to an improved method and apparatus for cleaning oil and gas well riser sections wherein a specially configured cap or pair of caps are fitted to the ends of the riser which enable pressure washing cleaning tools (or a camera) to be inserted into and through the riser cleaner fluid continuously recirculates so that relatively small volume of cleaning fluid (for example between about 700 and 1,000 gallons) is required. The cleaning process uses a volume of cleaning fluid that is discharged from the riser pipe at a relatively high temperature of about between 100 and 180° F. Such a high temperature cleaning fluid could possibly damage the pump that is used for supplying pressurized fluid to the cleaning tool. The present invention provides a method and apparatus for enabling continuous recirculation of fluid to the cleaning tool at a flow rate of between about 7 and 12 gallons per minute while lowering the temperature to about 60° F.

A method of cleaning a jet pump assembly of a nuclear reactor may comprise inserting a cleaning tool into the jet pump assembly such that a front face of the cleaning tool is adjacent to an inner surface of the jet pump assembly and below a level of a first liquid in the jet pump assembly. The method may additionally comprise directing a plurality of front jets of a second liquid from a plurality of front orifices on the front face of the cleaning tool such that the plurality of front jets of the second liquid strikes the inner surface of the jet pump assembly. The method may further comprise maintaining a standoff distance between the front face of the cleaning tool and the inner surface of the jet pump assembly during the cleaning of the jet pump assembly.

Device for removal of sediment from inside piles being at least partly immersed in water, comprising an outer guiding unit arranged to be temporarily positioned on the top of a pile. The outer guiding unit envelopes at least one inner dredging unit being arranged to be lowered from within the outer guiding unit, the inner dredging unit at its lower end exhibiting movable jet nozzles arranged to loosen sediment. The inner dredging unit furthermore comprises a central passage which is connected to a discharge hose arranged to transport loosened sediment therefrom.

A cross-jet nozzle includes a rotor body, in which several channels are recessed or formed running from a nozzle tip in the direction of a stator body, in which at least two front jet nozzles are positioned in the rotor body through at least two front jet channels and oriented so that front jets of a pressurized medium emerging from the front jet channels intersect outside of the rotor body and the rotor body can be mounted to rotate around its longitudinal axis on the stator body, which can be connected to a high-pressure line connection, is introduced safely parallel into tubes by a drive unit of a lance device. The nozzle tip is provided with an outer surface so that the surface is configured convexly arched, dome-like and free of edges and the nozzle tip is formed mirror-symmetric with the longitudinal axis in profile.

An apparatus for sensing an obstruction within a tube being cleaned and repetitively advancing and retracting a flexible high pressure fluid cleaning lance within the tube is disclosed. The apparatus monitors drive roller/belt position and actual hose position, compares the belt (expected travel) to hose position (travel) and generates a position difference, or mismatch. If the mismatch is above a predetermined level, the drive motor direction is reversed for a predetermined time interval, and forward operation restored after the predetermined time interval; and the sequence of repeating the reversing and restoring operations is continued until the position difference or mismatch no longer exceeds the predetermined difference threshold.

A system and an apparatus for positioning a plurality of flexible cleaning lances includes a frame removably fastened parallel a tube sheet of a heat exchanger. The apparatus includes a smart lance tractor drive for advancing and retracting one or more lance hoses through one or more lance guide tubes into tubes penetrating through the heat exchanger tube sheet, a controller, one or more AC induction sensors on the tubes operable to sense holes in the tube sheet, and a tumble box connected to the controller operable to generate electrical power to the AC induction sensor from an air pressure source, supply electrical power to the controller and distribute pneumatic power to pneumatic motors for positioning the tractor drive on the positioner frame. The tractor drive includes sensors for detection of mismatch between expected and actual lance positions and automated drive reversal operation to remove blockages within tubes being cleaned.

A multiple flexible high pressure fluid cleaning lance drive apparatus includes at least a first drive motor having a first drive shaft, a spline drive roller mounted on the first drive shaft, a plurality of cylindrical guide rollers extending parallel to the spline drive roller, an endless belt wrapped around the spline drive roller and the plurality of guide rollers, and one or more follower roller modules each supporting a plurality of follower rollers for pressing against a single flexible lance. Each follower roller module independently presses its follower rollers toward the endless belt to grip the flexible lance sandwiched therebetween. Each module has an elongated block shaped housing having a central axis, a plurality of pneumatic cylinders and a piston rod carried in each pneumatic cylinder supporting a pair of spaced follower rollers that ride on the flexible lance captured between the endless belt and the follower rollers.

At least one glass element includes: a first end; a second end; and a hollow portion including a first end section including the first end of the at least one glass element, a middle section, and a second end section including the second end of the at least one glass element. Each section has an inner surface and an outer surface and all sections are of equal length. A ratio of a number of particles on the inner surface at the first end section and/or the second end section to a number of particles on the inner surface at the middle section is 20 or less.

A pole roller configured to prevent a hose from contacting a side surface point of entry in a pipeline or an obstacle. The pole roller includes a roller having an axis, a shaft opening and a pair of end walls, wherein the end walls include a top and bottom bearing end wall. Said roller, being rotatable about a stationary axle disposed at the axis of the roller. The shaft opening can include an optional crush sleeve disposed between a pair of roller bearings, the roller bearings being disposed at the top and bottom end walls respectively. A base frame having at least one pull-line finger, a protection wear ring and a plurality of base support feet, the pull-line fingers and the base support feet mounted to the protection wear ring. A pole attachment member mounted to the stationary axle for allowing an elongated pole to be attach thereon.

A heat exchanger cleaning device is provided. The cleaning device includes a drive motor configured to rotate a gearbox, a slip clutch, and a support beam about a first axis. The support beam carries a thread rod, a second motor, and one or more carriage assemblies. The carriage assemblies move linearly as the second motor rotates the threaded rod. The carriage assemblies include a support tube for receiving an ultra-high pressure tube therethrough. The carriage assemblies adjust relative to the heat exchanger such that the UHP tube may be inserted through the support tube into a hole of the heat exchanger. Therein the UHP tube may be advanced to clean sediment from the heat exchanger tube.