Abstract: An apparatus comprises a movable lock ring and a lock arm that prevents inadvertent movement of the lock ring. Contemplated configurations are especially useful in delayed coking vessels to prevent opening of the vessel while the vessel is in operation.

Abstract: A coke drum bottom head removal system and method for deheading the bottom head cover of a coke drum comprises a carriage that is positionable beneath the bottom head cover, and a cart mounted to the carriage. Several clamps vertically mounted to the cart are positionable in a closed position, in which the clamps apply a compressive force that maintains substantially fluid tight engagement between the bottom head cover and bottom head flange, and an opened position, in which the clamps allow a limited spacing between the bottom head cover and the bottom head flange. A plurality of supports mounted to the cart support the bottom head cover once the fasteners coupling the bottom head cover to the bottom head flange are removed and the clamps are in the opened position. The system can be remotely operated to enhance operator safety when the bottom head cover is removed.

Abstract: The present invention features a flange to flange dynamic seal and sealing system, particularly suited for use within high temperature, high pressure environments, such as a delayed coking process. The dynamic flange seal and sealing system comprises two primary elements or seals, each of which are capable of independently forming a flange seal between two flanged components or combining to create a flange seal. Specifically, these primary seals are an iconel bellows seal and a bi-material gasket, each of which surround a flange opening along a sealing surface. The flange seal created by the dynamic flange seal and sealing system is capable of being maintained in light of, or rather the sealing system adapts to, any structural or environmental changes within the connected flanges. As such, the flange seal may be a dynamic flange seal or a static flange seal or both.

Abstract: A coke oven and a method of operating the same, capable not only of achieving a uniform combustion temperature heightwise within a combustion chamber when a rich gas or a lean gas is burnt, but also of reducing NOx content in the waste gas, while eliminating localized high-temperature combustion. The combustion chamber of the coke oven comprises a rich-gas port 2 located near an oven wall 6 bordering a carbonization chamber in the bottom 5 of combustion chamber, and the midpoint P3, connecting the center P2 of a lean-gas port 7 and the center P of an air port 3, is on the side opposite to the rich-gas port 2 relative to the center line CL of the combustion chamber. (See FIG.

Abstract: A coke oven door comprises a generally rectangular outer frame, a generally rectangular inner frame positioned within the outer frame and a seal operably mounted to the inner frame and adapted for effecting sealing against a jamb of a coke oven. The outer frame is adapted for moving the seal toward the jamb and the outer and inner frames are pivotally connected so as to be able to pivot relative to one another about a longitudinal pivot axis.

Abstract: The present invention features a coke drum de-heading system that provides unique advantages over prior art de-heading systems, namely the de-heading of a coke drum without having to physically remove the head units. This is essentially accomplished using one of a variety of specially designed de-header valves that may be removably coupled to a coke drum much the same way a conventional head or flange unit would be attached. The de-header valve is equipped with, among other things, a valve closure and means for supporting a valve closure capable of forming a continuous contact seal during the coke manufacturing process. The means for supporting a de-header valve typically comprises a seat support system comprising a variety of configurational designs. Actuation of the valve closure functions to open and close the de-header valve, wherein in a closed position, the de-header valve and coke drum are prepared to receive the petroleum byproduct feed from the refinery process used to manufacture coke.

Abstract: The invention relates to a device for controlling the gas pressure in a coke oven chamber comprising an immersion cup, which supplies water, and an immersion pipe, which is connected to the gas space of the coke oven chamber and terminates in the immersion cup. The immersion cup comprises an overflow and a closeable drain. The invention provides that, in order to control the level of the liquid, a drain pipe for water is provided whose inlet side end projects into the immersion pipe and whose lateral surface side is provided with inflow openings for admitting water. A slide, which is open on both faces, is placed inside the drain pipe, closes the inflow openings of the drain pipe according to its position in the longitudinal direction and forms a vertically adjustable overflow for the water flowing into the drain tube. The inflow side end of the drain pipe is surrounded by a siphon pipe, which closes the drain pipe at the top and forms an annular channel.

Abstract: The invention relates to a device for lilting and removing oven doors of a coking oven that is comprised of a door removing head (1), which can be coupled to vertically extending oven doors of a horizontal chamber coking oven, of a drive device (3) for effecting adjusting movements of the door removing head (1), and of a suction hood, which can be displaced along the horizontal chamber coking oven above the oven door. According to the invention, sealing elements (5) are connected to the door removing head (1) and, on both sides of an oven door (2) to be opened, can be displaced against front contact surfaces (6) of the horizontal chamber coking oven. Said sealing elements extend essentially over the entire height of the oven door (2) and into the suction area (4) of the suction hood, and they form a suction chamber (8) for door emissions when the oven door (2) is opened.

Abstract: The present invention features a coke drum de-heading system that provides unique advantages over prior art de-heading systems, namely the de-heading of a coke drum without having to physically remove the head units. This is essentially accomplished using a specially designed dual seated, linear motion goggle blind gate valve, or de-header valve, that is removably coupled to and seals against the flanged portion of a coke drum much the same way a conventional head unit would be attached. The de-header valve is equipped with, among other things, a sliding blind that is contained and capable of moving within an upper and a lower seat, wherein one of such seats is a floating dynamic, live loaded seat that is capable of automatic adjustment through one or more loading zones so as to seal the blind between the upper and lower seats.

Abstract: A distillation system is provided for batch thermolytic distillation of lump carbonaceous material, such as lump wood and shredded rubber tires. The system preferably includes multiple distillation units mounted side-by-side. Each unit includes a reactor bath for holding molten tin at approximately 455° C., a two-compartment reservoir for storing molten tin, and a porous basket pivotally mounted within the reactor bath for tipping motion.

Abstract: Improved coke chute systems (100) include a lock (130) that receives and automatically secures a coke-receiving conduit (110) to a coke vessel after the lock (130) is switched to a closed position. Contemplated systems may further be combined with a horizontally movable coke chute cover, or a cover that is moved by an actuator (114) that lifts and rotates the cover from a first position to a second position.

Abstract: A portable reactor container that contains a removable fire grate enclosure and an incline on its floor that slopes to a discharge port. Heating elements are arranged between the enclosure and the container. A heat recovery section, which may be a water reservoir, surrounds the outside of the container to convert water into steam by absorbing heat leaving the container. The enclosure may be inserted into or removed from the container with a forklift. Wood waste or other wood waste material may be filled into the fire crate enclosure to be transformed into wood charcoal by heating appropriately while the container is hermetically sealed.

Abstract: A closed system that eliminates worker exposure during coker vessel decoking operations and thereby significantly reduces risks to workers also increase coking capacity by reducing the coking cycle time. The closed system preferably comprises a coker vessel with a side entry feed line attached to the vessel above the vessel bottom; a closure housing with laterally moveable closure member therein sealed to the vessel bottom either directly without, or indirectly with an adapting spool member and; a coke chute sealed to the bottom of the closure housing. The system can be remotely and repetitively operated through numerous coking/decoking cycles without removal of any system element.

Abstract: The present invention features a coke drum de-heading system comprising (a) at least one coke drum having an orifice therein; (b) a de-header valve removably coupled to the coke drum designed to de-head the coke drum; and (c) an exchange system, including an upper and lower bonnet and other elements and members adapted to integrate the de-heading system, and particularly the de-header valve, into the manufacturing system.

Abstract: A combination reflux/distillation apparatus is provided having interchangeable reflux and distillation columns, a segmented collection trough and an integrated indirect heating provision. The apparatus is uniquely adapted for refluxing and distilling small quantities of materials without the losses attendant to larger apparatus.

Abstract: An apparatus for removing a bottom cover on a coke drum. A support structure supports at least the coke drum. A vertical actuator has a cover end attached to the bottom cover and a support end attached to the support structure, and is arranged to move the bottom cover vertically in a removal operation of the bottom cover. A rotating actuator has a cover end attached to the bottom cover and a support end attached to the support structure, and is arranged to rotate the bottom cover in a removal operation. A frame assembly having opposing ends is provided, a pivoting end being attached to the bottom cover and a sliding end being slidably mounted. The frame assembly, the vertical actuator and the rotating actuator cooperate to remove the bottom cover in a removal operation.

Abstract: The present invention features a coke drum de-heading system that provides unique advantages over prior art de-heading systems, namely the de-heading of a coke drum without having to physically remove the head units. This is essentially accomplished using a specially designed dual seated, linear motion goggle blind gate valve, or de-header valve, that is removably coupled to and seals against the flanged portion of a coke drum much the same way a conventional head unit would be attached. The de-header valve is equipped with, among other things, a sliding blind that is contained and capable of moving within an upper and a lower seat, wherein one of such seats is a floating dynamic, live loaded seat that is capable of automatic adjustment through one or more loading zones so as to seal the blind between the upper and lower seats.

Abstract: A coke drum bottom head removal system and method for deheading the bottom head cover of a coke drum comprises a carriage that is positionable beneath the bottom head cover, and a cart mounted to the carriage. Several clamps vertically mounted to the cart are positionable in a closed position, in which the clamps apply a compressive force that maintains substantially fluid tight engagement between the bottom head cover and bottom head flange, and an opened position, in which the clamps allow a limited spacing between the bottom head cover and the bottom head flange. A plurality of supports mounted to the cart support the bottom head cover once the fasteners coupling the bottom head cover to the bottom head flange are removed and the clamps are in the opened position. The system can be remotely operated to enhance operator safety when the bottom head cover is removed.

Abstract: The present invention features a coke drum de-heading system comprising (a) at least one coke drum having an orifice therein; (b) a de-header valve removably coupled to the coke drum designed to de-head the coke drum; and (c) an exchange system, including an upper and lower bonnet and other elements and members adapted to integrate the de-heading system, and particularly the de-header valve, into the manufacturing system.

Abstract: The present invention provides a substantially remote operable system for connecting and disconnecting a vessel. The system comprises a substantially remotely operable joint connector for connecting and disconnecting structural units. The system and the method using the system may also comprise a remote operable closure transport for removing a vessel closure from an opening in the vessel, and a substantially remote operable removal system for allowing material to be emptied from the vessel to increase operational efficiency.

Abstract: A coke drum head is hinged to a coke drum body using a compound joint such as a trammel pivot, and the head is moved between open and closed positions using an actuator. In moving between open and closed positions, the head traces out a non-circular path which reduces the required headroom relative to a head using a standard pivot.

Abstract: The present invention provides a fully remotely operable system for loading and unloading a vessel. The system comprises a remotely operable joint connector for sealing or unsealing a vessel. It also consists of a remotely operable closure transport for removing a vessel closure from an opening in the vessel, and a remotely operable removal system for allowing material to be emptied from the vessel.

Abstract: A continuous-flow water distiller includes a housing having a removable heating vessel which receives water to be distilled A heater is immersed within the water in the vessel for producing steam. The housing includes an openable lid which, when closed, seals the heating vessel so that steam can be directed through an outlet into a condenser located in the housing. Raw water is supplied to the heating vessel through a heat exchanger to preheat the raw water by effectively utilizing thermal energy recovery to initiate cooling of the steam, and distillate is supplied through the condenser to enhance heat exchange.

Abstract: A system is disclosed for automatically removing the cover of a chute beneath a coke drum. The system operates in conjunction with a remotely operable coke deheading device so that the chute cover is removed when the coke drum is deheaded. Also disclosed is a method for facilitating coke removal from a coke drum into a coke chute where the chute cover is automatically removed upon activation of the coke drum deheading device.

Abstract: A semi automatic coke drum deheader device for use on a coke drum wherein the coke drum includes an upper opening, a flange surrounding the upper opening and a first vessel cover releasably attached to the flange. The deheader device comprises a frame attached to the coke drum, a bridge for supporting the first vessel cover and a second vessel cover, a central shaft having a distal end connected to the bridge and a thrust collar surrounding the shaft below the distal end. A lift assembly is attached to the frame for engaging the thrust collar to selectively raise and lower the bridge relative to the flange, and a rotational assembly is operatively connected to the central shaft for rotating the bridge to selectively align the first vessel cover or the second vessel cover above the flange during the delayed coking process.

Abstract: A cable system for raising and lowering a door of an industrial furnace utilizes a pair of vertically extending cables having lower ends connected to the door and upper ends connected to shaft-carried sheaves that are rotated concurrently to cause upper portions of the cables to be wound onto and off of the sheaves to raise and lower the furnace door to open and close a furnace opening defined in a vertical furnace face. The cables wind onto and off of sheave-defined tracks that are configured to cause lower portions of the cables to move the door a small distance horizontally during raising and lowering. This small distance horizontal movement capability may be utilized at the initiation of door raising to move the door away from the furnace face, and at the conclusion of door lowering to close the door against the furnace face to close the furnace opening.

Abstract: In a coke drum an outlet arrangement is provided which allows removal of the coke from the drum without endangering the health or safety of workers heading or unheading the coke drum. Instead of using a manually removable bottom flange for the drum, a semiautomatic bottom flange removal system is provided. A spool is attached to the conventional, pre-existing, about 6 feet in diameter drum stationary bottom flange. The spool includes a tapered clamping surface. A new style removable bottom flange also includes a tapered clamping surface. The tapered clamping surfaces cooperate with clamp ring sectors movable by externally mounted hydraulic cylinders into contact with the spool and the flange, and other hydraulic cylinders mounted directly on the ring sectors move male locking surfaces into locking engagement with cooperating female locking surfaces formed on adjacent clamp ring sectors.

Abstract: The present invention provides a substantially remote operable system for connecting and disconnecting a vessel. The system comprises substantially a remotely operable joint connector for connecting and disconnecting structural units. The system and the method using the system may also comprise a remote operable closure transport for removing a vessel closure from an opening in the vessel, and a substantially remote operable removal system for allowing material to be emptied from the vessel to increase operational efficiency.

Abstract: A portable distiller convertible between an operating mode and a storage mode which permits easy transport includes a boiler vessel, a condenser, and a collection container. The condenser is mounted on a two-way lid which engages the top of the boiler in an operating mode to support the condenser over the boiler. The lid is insulated to prevent the transfer of heat from the boiler to the condenser. The lid is reversible to allow the condenser to be inserted into the boiler vessel for storage. The container may also be stored in the boiler, and preferably receives the condenser for storage.

Abstract: A method and apparatus for refurbishing eroded portions in coke oven doorjambs including refurbishing apparatus having a framework attached to the coke oven structure adjacent the doorjamb. The framework supports a carriage that is simultaneously moveable in an "X" axis direction and a "Y" axis direction within the boundary so that a machine-cutting tool, attached to the carriage, can be moved from one position directly to another position within the framework boundary. The machine-cutting tool is positioned to make cutting passes alone new metal that is fused into the eroded portions of the coke oven doorjamb.

Abstract: A water distiller incorporates a removable vessel for containing water, a heat source disposed below the removable vessel for heating the water to produce steam, a condenser for condensing the steam into distilled water, and an outlet from the condenser for directing distilled water into a collection container.

Abstract: A reaction with distillation column is provided with a plurality of discrete catalytic reaction containers. The containers contain a plurality of solid catalyst particles which form a catalytic reaction zone. The containers also include a liquid collection tray cover which defines a liquid accumulation zone immediately overlying the catalytic reaction zone. Overflow weirs are provided on the tray cover to allow for overflow of liquid on the tray cover. A member may be provided within the containers to create an open area within the catalytic reaction zone to facilitate entry of the liquid into the catalytic reaction zone. The containers can be individually positioned within the reactor to suit particular process requirements.

Abstract: In a coke drum an outlet arrangement is provided which allows removal of the coke from the drum without endangering the health or safety of workers heading or unheading the coke drum. Instead of using a manually removable bottom flange for the drum, a semiautomatic bottom flange removal system is provided. A spool is attached to the conventional, pre-existing, about 6 feet in diameter drum stationary bottom flange. The spool includes a tapered clamping surface. A new style removable bottom flange also includes a tapered clamping surface. The tapered clamping surfaces cooperate with clamp ring sectors movable by externally mounted hydraulic cylinders into contact with the spool and the flange, and other hydraulic cylinders mounted directly on the ring sectors move male locking surfaces into locking engagement with cooperating female locking surfaces formed on adjacent clamp ring sectors.

Abstract: A pusher side coke oven door assembly comprises a door, a cold face refractory wall attached to the door, and a hot face refractory wall attached to and spaced from the cold face refractory wall to form therewith a hollow vent space for gases evolved from roasting coal, wherein a top section of the hot face refractory wall is L-shaped and has a horizontally-disposed leg extending across the hollow vent space, and a pair of extender plates mounted on the leg and extending vertically thereabove to prevent coal spillage and entry into the hollow vent space during coal levelling.

Abstract: An evaporator includes a tank covered by a lightweight lid which is easily lifted to avoid high pressure in the event of an explosion. The bottom of the tank includes a flat portion which slopes downwardly toward an outlet in the sidewall of the tank. The flat section is substantially wider than the outlet to accommodate use of a square-nosed shovel to clean the tank. A fire tube in the bottom of the tank receives hot gases from a burner. A thermometer senses the temperature of the wall of the fire tube to respond to low liquid level in the tank, scale on the fire tube wall, and buildup of solids in the mixture. The open lower end of an upwardly extending standpipe is in liquid in the tank. The upper end of the standpipe is closed by a ball valve and extends above the mixture in the tank. Devices are provided for making the pressure in the standpipe different from atmospheric pressure.

Abstract: An evaporator flask for a rotary evaporator is formed in two portions: a substantially cylindrical bowl and a lid secured to the bowl by a connecting ring. The lid is connected to a rotary drive mechanism, and a conduit passes through a central aperture in the lid to provide fluid communication between the interior of the flask and a condenser. A mechanical scraper or stirrer is affixed to the end of the conduit within the bowl portion of the flask.

Abstract: Method for the gas sealing manufacture of a door frame of a coke oven battery which battery comprises a refractory structure with an armor plate connected to it onto which the door frame is fitted characterized by the following steps:measuring the profile of the surface of the armor plate at the position where it faces the door frame in its mounted state;fitting a profile to one side of the door frame which in its mounted state faces the armor plate, corresponding to the profile of the surface of that armor plate measured in the previous step, in such a way that in its mounted state the door frame rests essentially against the armor plate;placing the door frame thus adapted against the armor plate.

Abstract: A coke-oven door seal and sealing system wherein the coke-oven door seal comprises a sealing arm in angular relation with a door jamb surface, said sealing arm being engagable with said door jamb surface at a knife edge, and said sealing arm protruding beyond said knife edge and away from said door jamb surface creating a reinforcing and ventilating rib for cooling said knife edge which is capable of supporting a secondary sealing means. The sealing system of the present invention comprises a coke-oven door seal, including a sealing arm in angular relation with a door jamb surface, said sealing arm protruding beyond the knife edge at which said sealing arm engages said door jamb surface and a pivotable plunger system which comprises a standard plunger connected to a plunger extension which consists of a pad and a ball joint or other swivel or rocking means.

Abstract: Renovation of a heating wall, in particular a heating wall of a coke oven battery, includes starting with a vertical wall raising of a part to be renovated on a wall protective plate of the part, abutting a new masonry exactly on the wall protection plate, and arranging between the new masonry and the old masonry a vertically extending welding joint from a ceramic material.

Abstract: A coke oven door, which includes a metal frame, means for latching the door in a closed position, a sealing member extending around the perimeter of the frame having forward edges adapted to contact a sealing surface on a coking chamber door jamb for effecting a continuous seal. The coke oven battery also having at least one attached protrusion proximate the coking chamber extending outwardly from the battery, such as a latch or a guide bar, said door comprising a door plug passing with clearance and fitting into the coke oven, said plug having an inner surface that forms an interior end wall of the coke oven wherein a first plane is formed by the perimeter of said inner surface.

Abstract: A distiller for producing potable water employs a metal boiler tray having a cover member in which there is an inlet for raw water and which together form a steam chamber having an outlet for steam. The boiler tray bottom has a plurality of steps including a highest, an intermediate and a lowest level step which are all covered with water at the beginning of a distillation cycle. The temperature of the highest level step is monitored with a sensor. A rise in the temperature of the highest level step by a predetermined amount above the boiling temperature of water indicates that the highest and intermediate level steps have become dry. This results in a signal to a controller to open a valve and admit replenishment raw water whose amount is dependent on valve open time. Steam evolved from the boiler tray is conducted through a first check valve in the cover member to demister chamber when the mist or carryover water in the steam impinges on a baffle and is separated from the steam as condensate.

Abstract: A plant for processing vegetal stock includes a container mounted on a twheel trailer, and provided with bubblers for live steam which are arranged under a net for accommodation of the vegetal stock, and a detachable cover communicating through a steam pipe with a cooler which communicates with a separator through a distillate admission pipe provided with a splitter for preventing plug-shaped formation of oil therein. The bubblers for live steam are arranged in two planes perpendicular to the axis of the container and mounted in the cover is an additional bubbler.

Abstract: There is described an apparatus for distilling liquids in a vacuum, having a receptacle for a liquid that can be connected to a vacuum pump, a heating arrangement for heating the receptacle causing the liquid to evaporate, a condenser for condensing the vapour, and a collecting vessel for the condensate. To be able to handle the apparatus quickly and more simply and to make it overall more economical and make it possible to carry out continuous distillation, the heating arrangement includes a vacuum-tight receiving chamber (1) for the receptacle (2) and a microwave generator (13, 13.

Abstract: A waste photopolymer plate washout fluid solvent distillation apparatus includes a single enclosure enclosing a waste washout fluid container, a recovered solvent container, and a distillation unit in which waste washout is distilled by application of heat and vacuum pressure to the waste washout, and by supplying a metered supply of a surrogate solvent to the distilled waste washout as a desired solvent is distilled from the waste washout. The apparatus, by supplying the surrogate solvent to the waste washout as the desired solvent is distilled from the waste washout, enables a greater percentage of the desired solvent to be recovered from the waste washout than has been heretofore possible with prior art apparatus, and also enables the waste washout to be disposed of as a liquid.

Abstract: A leveling door for sealing a leveling opening of a coke oven door has a leveling door body, a diaphragm sheet mounted on the leveling door body at its side facing a leveling opening so as to cover the leveling opening, the diaphragm sheet having an edge and being provided on the edge with a circumferential sealing frame, a plurality of pressing elements acting on the sealing frame and distributed over a periphery of the sealing frame, a plurality of socket pins mounting the pressing element on the leveling door body, and an exchangeable heat protective screen arranged in front of the diaphragm sheet at a side facing the leveling opening.

Abstract: A low profile water distiller has a housing. A steam chamber is located within the housing having a horizontal dimension greater than its vertical height. A condenser is also located within the housing having a horizontal dimension greater than its vertical height. The vertical height of the condenser is generally the same as the vertical height of the steam chamber. A raw water conduit extends in a generally horizontal plane within the housing for delivering water to be distilled into the steam chamber. A steam conduit also extends within the housing for delivering steam from the steam chamber to the condenser. The steam conduit extends in a generally horizontal plane parallel to the generally horizontal plane of the raw water conduit. An air circulation channel within the housing draws cooling air through the condenser in a generally horizontal path parallel to the generally horizontal planes of the raw water conduit and the steam conduit.

Abstract: A wastewater evaporator system is provided for evaporating wastewater at a rate of about seven gallons per hour. Such system includes a heater, a blower, a plurality of honeycombed plates, a drive element including an electric motor, and a tank. Such system improves the environment and allows safe, reliable, and economical disposal of wastewater.

Abstract: A water distiller includes a base having a front portion for supporting a container and having a housing extended upward from the rear portion, a vessel disposed in the housing for containing water, a heater disposed below the vessel for heating the water contained in the vessel into steam, and an arm extended forward from the housing. A radiator is disposed in the arm for cooling the steam flowing into the arm, and the condensed water is collected in the container.

Abstract: A water distiller has a housing having an open interior area and a door that can be opened and closed to permit and block access into the interior area. A steam chamber is located in the interior area. The steam chamber includes a movable tray for holding water to be distilled. The tray seats against a fixed top where steam created in the chamber by heating the water in the tray is collected. By opening the door to the distiller, the tray can be unseated and removed for cleaning. After cleaning, the tray can be returned to the distiller and reseated against the top steam collecting portion by closing the door. In a preferred arrangement, the tray includes a chamber for holding a water soluble disinfectant for release during the distillation process.

Abstract: A low profile water distiller has a housing. A steam chamber is located within the housing having a horizontal dimension greater than its vertical height. A condenser is also located within the housing having a horizontal dimension greater than its vertical height. The vertical height of the condenser is generally the same as the vertical height of the steam chamber. A raw water conduit extends in a generally horizontal plane within the housing for delivering water to be distilled into the steam chamber. A steam conduit also extends within the housing for delivering steam from the steam chamber to the condenser. The steam conduit extends in a generally horizontal plane parallel to the generally horizontal plane of the raw water conduit. An air circulation channel within the housing draws cooling air through the condenser in a generally horizontal path parallel to the generally horizontal planes of the raw water conduit and the steam conduit.