摘要:
A tank includes a cone-shaped wall formed of steel and attached between a first dome-shaped surface formed of steel and a second dome-shaped surface formed of steel. The cone-shaped wall attached between the first dome-shaped surface and the second dome-shaped surface defines an oval-shape void of angled corners on the inside surface of tank such that, when a product contained in the tank is displaced, the product is displaced in a torus shaped vortex between the first dome-shaped surface and the second dome-shaped surface.
摘要:
A system and method for installing a nozzle dam unit (26) in a nuclear steam generator having a head (12) including a head internal surface, a manway (14) penetrating the head, and a nozzle (16) penetrating the head. The system comprises a manipulator (76) adapted to be passed through the manway and having one end (82) adapted to be attached remotely to the head internal surface and a free end including a clamp member (104). A plurality of nozzle dam segments (54, 56, 58) are each sized to pass through the manway and carry means thereon (120) for engaging at least one other segment, the segments when fully engaged to each other forming a dam subassembly sized to pass into and seat against the nozzle. The manipulator is controlled so that the clamp member grasps and supports one of the dam segments within the head until the subassembly is formed within the head, and then is translated within the head until the dam subassembly seats within the nozzle.
摘要:
A nuclear steam generator isolation dam (28) locking pin (36) is slidably mounted and spring (52) biased in an axial bore (42,44) of a body (40) press fit in a dam boss (32). The pin (36) is actuated by a lever (54) in a slot (54,58,62) for selective lock-in, lock-out and spring biased travel for seeking its keeper (27) in the wall (26) of the nozzle.
摘要:
A nozzle plug (22) for blocking a nozzle (46) in a nuclear steam generator (16) is improved by the addition of hinges (40a, 40b) which allow the nozzle plug (22) to be inserted into the steam generator (16) through an access port (52) of substantially smaller diameter than the nozzle (46). A recess (54) is provided in one of the semi-circular plates (28) allowing the plates to nest, further reducing the necessary size of the access port (46).
摘要:
A removable plugging device for a pipeline, and particularly for pressure testing a steam pipeline in a boiling water reactor, wherein an inflatable annular sealing member seals off the pipeline and characterized by radially movable shoes for holding the plug in place, each shoe being pivotally mounted for self-adjusting engagement with even an out-of-round pipeline interior.
摘要:
A sealed stopper for an opening in a junction tubing between an enclosure and a pipe, including an attachment ring. The stopper includes a rigid lid and a sealing assembly borne by the lid including a passive annular gasket including at least one annular internal chamber, a first static annular gasket, a second static annular gasket and a flat gasket ensuring the seal of the opening of the tubing.
摘要:
A nozzle dam automatically latches on an annular ledge surrounding the nozzle opening. A pivotal latch arm on the dam, biased to the locked position is forced toward the unlocked position by a cam on the ledge as the nozzle is pressed on the ledge, and snaps into engagement with the ledge when the dam is fully seated over the opening. A bias arm may be operated by a wrench to pivot the latch arm toward the unlocked position until a detent locks the latch arm in the unlocked position.
摘要:
The present invention relates to a system, teaches a technique, and provides apparatus eminently useful for the installation/removal, from a remote and protected location, of nozzle dams onto and from nozzle holddown rings within the channel heads of certain steam generators, including the types typically used in conjunction with the operation of pressurized hot-water nuclear power plants. The technique or method of the instant invention involves methodology for remotely introducing usually with the aid of tackle insertion tool means, through an open channel head manway requisite tubesheet tackle means, or tackle means, as well as strapping means and the securing of same therein; inserting through said open manway, usually with the aid of lifting means, folded nozzle dam means; opening said dam means and properly orientating same relative to said nozzle holddown ring; inserting, orientating, and securing the center portion of said nozzle dam means, torquing bolting means to predetermined limits; and removing from said channel head all said attendant tubesheet tackle means. The effecting of the instant technique requires only a minimal amount of relatively inexpensive, but specially designed equipment and is simply, quickly, and easily placed into practice by, for example, manipulation of same by one or more human operators who are physically located outside said channel head(s) and adjacent said open manway thereby substantially reducing the effective radiation dose heretofore normally associated with such nozzle dam installation and removal.
摘要:
A pneumatically actuated nozzle dam or the like for placement internally of a passageway, enabling the passageway to be sealed off upon inflation of a pneumatically inflatable ring. The apparatus includes an elastomeric diaphragm provided with sidewalls projecting in a downstream direction and joined with sealing flaps surrounding the sidewall and projecting back in an upstream direction. An inflatable pneumatic element is positioned between the sidewall and sealing flap and connected to only one of them. Upon inflation, the sealing flap is forced against the walls of the passageway to provide a seal. If depressurization of the inflatable element occurs, the sealing flap is retained in operative position by pressure of the retained body of liquid on the upstream side of the seal. The new arrangement eliminates the need for redundancy of the pneumatic element and, at the same time, provides for greater safety.
摘要:
A sealing device for pipe connectors discharging into a vessel includes a retaining ring having a flange and being disposed at the mouth of the pipe connector and tightly joined to the wall of the vessel. A rigid disk closes off the opening of the pipe connector. A seal is disposed between the rigid disk and the flange. Fast-action clamping elements extend through slits formed in the rigid disk and slits formed in the retaining ring. The fast-action clamping elements are supported on the disk and locked and braced on the retaining ring for securing the rigid disk to the flange with the interposition of the seal.