Anchor couplings are not stocked at all ejp locations. A failure to exhaust the pressure above piston 56 would prevent the main steam isolation valve from closing. For more details on this upgrade and how it can improve the performance of your installed anchor darling double disc gate valve, contact your flowserveraleigh sales engineer directly or flowserve raleigh at 18002256989. Qfix family of allsuture implants the qfix family of implants is a next generation allsuture implant technology, providing the benefits of an allsuture implant with superior performance characteristics than traditional anchor designs. As many of the existing valves are yglobes with motor actuators, the 1700 series gate valve will be a competitive replacement, particularly where it will provide increased. Flowserve anchordarling can provide designs which reduce the required time for disassembly and maintenance to an absolute minimum. The samd can be used to periodically monitor and trend stem rotation for the entire valve stroke with extreme accuracy through the use of a state of the art. Verification manualtest problem manualexample manual. Our doubledisc gate valves installed in hightemperature isolation service have remained tight for as long as eight years. Anchor darling double disc gate valves have been supplied to the commercial nuclear industry for critical service since the early 1970s. This in provides a discussion of the recent lasalle county station, unit 2 anchor darling ddgv. I encourage sharing and dialogue, peer checking, fact checking in the pursuit of exceptional, safe. Valves with electric motor actuators which produce high output torques are the most susceptible to failure. Typical hydrant connection using a hydrant tee and anchor coupling to restrain the hydrant gate valve and the hydrant to the water main variable length ductile iron mechanical joint fittings di anchor coupling size product number 6.
It has been observed that chronic packing leaks have occurred on double disc gate valves in safety injection and charging systems in pwrs. Mug anchor darling disc gate valve training january 18 expo january 1518 mug aug conference week january 1519, 2018 new orleans marriott hotel 555 canal street new orleans, louisiana aov users group january 1719 canug january 1519 flm users group boric acid users group january 1618 expo january 1518 mug aug canug flmug baug. Olenka, the daughter of the retired collegiate assessor plemyanikov, was sitting on the backdoor steps of her house doing nothing. World leader in design, manufacture and service support for. Tennessee valley authority anchor darling double disc gate. Resolve flowserve 1 ocfr part21 notification affecting anchor darling. Evaluating aov and mov performance asme digital collection.
The anchordarling doubledisc gate valve produced a tight seal, so the entrapped air tests were performed with bonnetonly pressurization. Main steam isolation valve anchordarling valve company. In those events the vendor had identified as susceptible to this failure mode any anchor darling type double disc gate valve with a threaded stem to upper wedge connection, typically size 2. Anchor darling double disc valve repairs, 5 main steam safety valve replacements, april 2015. Water, sewer ductile iron b b9 mechanical joint fittings. D, and was determined to be caused by excessive gland follower clearances and stuffing boxes oversized by 0. This functionality should be of great help if one would like to refer to a specific portion of large pdf such as some standard or specification.
Results of pressure locking and thermal binding tests of gate valves. Nuclear energy institutenei letter to nrc, anchor darling double disc gate valve industry resolution plan update project 689, dated august 4, 2017 ml17220a363 2. In april 1996, a specific stem preload torque value was established based on valve size and pressure class. Nei developed and is managing this plan to coordinate industry response, actions, and communications to address the resolution of the anchor darling ddgv issue. Are you trying to create links to certain locations in a pdf file. The following video, show the construction of anchor darling double disc gate valve disc pack. Ted neckowicz senior staff engineer exelon gen corporate.
Background with the force pushing the disc into the seat to keep pace with continually increasing demands for power in the last decade. Flowserve anchor darling valves availability chart anchor darling cast steel gate, globe, angle and check valves description pressure rating pressure seal bonnet globe and angle stop valves bolted bonnet globe and angle stop valves asme 600110 pressure seal bonnet double disc gate valves butt weld or flanged asme 600110 asme 900150 asme. This special design permits that the sealing load increases as the differential pressure across the disc increases too, thus providing a tight seal throughout the entire range. Nuclear energy institute anchor darling double disc gate. Anchor darling piston check valves are versatile valves designed for low or pulsating flow applications where pressure drop through the valve is not critical. Browns ferry nuclear plant, units 1, 2, and 3 anchor darling double disc gate valve information notes.
This rotating feature allows the disc to seat in a different position on each closing stroke. Tapping valves shall be provided with plugged flush port at bottom of gate guide and plugged tap for pressureleak testing. Bhi energy, knowledge worth sharing, ad ddg youtube. Flowserve anchordarling double disc gate valve ted neckowicz exelon floyd bensinger flowserve. Weaklink analyses of anchor darling double disc gate valves should fully assess the stemwedge assembly including the thrust collar replacement stems should be of the integral onepiece design next actions. The packing developed some leakage, but it could be controlled by. This ironton steel gate anchor holds a gate in any desired position, preventing it from swinging and sagging. These brands are available in various sizes, end configurations and operating pressures up to 2400.
Industrycoordinated actions for assessing the population of. Mar 04, 1986 a double disc gate valve of the type wherein discs are provided with wedge means which force the discs against substantially parallel opposed valve seats having at least one spherical surface between a wedge and a valve disc to allow the discs to have more freedom of movement to accommodate misalignment of the seats due to variation in manufacturing tolerances or pipe line distortion. Arnolds profile on linkedin, the worlds largest professional community. The wedge assembly is designed to impart sufficient thrust to each disc segment to maintain acceptable seat leakage. Specifically, the anchordarling product line includes a wide variety of doubledisc and flexwedge gate. Two gate valves representative of both relatively weak and strong valves commonly. In the early days of disc golf, players used a lot of putters and midranges for their drives, and latitude 64 still feels that many players could benefit from this line of thinking. Designed to be augured into extremely hard soil where 6 disc anchor will not suffice. Velan and anchor darling double disc gate valves on safety. Babcock supplies a 20 double wedge and double disc gate valve operated by electric actuator, for a special requirement received from a petronas refinery in malaysia. Anchordarling doubledisc gate valves flowserve corporation. A12 and a12r performed well in testing with clean gases.
This recommended standard stem preload torque is based on a calculated, required stem. Mechanisms of particle removal during brush scrubber cleaning. There is a standard from adobe that in theory specifies opening pdf documents from a link clicked in a browser in a way to open specific sections aka anchor, named reference of pdf document. Tennessee valley authority anchor darling double disc. Every player needs an anchor disc to behave predictably, saving throws, while competitors risk it all with their widerim drivers. For more details on this upgrade and how it can improve the performance of your installed anchor darling double disc port centerline gate valve, contact your flowserveraleigh sales engineer wedge directly or flowserve raleigh at 18002256989.
Mechanisms of particle removal during brush scrubber. Anchor darling double disc gate valve wedge pin failure. Anchordarling double disc gate valves flowserve corporation. The anchor darling double disc gate valve metc soa test valve nos. Double disc gate valve anchordarling valve company. Anchor darling after hours emergency shipmentsmark weseen. Anchordarling double disc gate valve wedge pin and stem.
Anchor darling double disc phase array diagnostic training jesse delgado, ihi southwest tech jeremy howe, ihi southwest tech john arnold, aptim 12. Anchor darling double disc gate valves are designed to provide isolation of a piping system or a component when closed. A simple solution is to utilize a tight tolerance high. Anchordarling 1888 doubledisc gate valve user instructions. Entergy anchor darling double disc gate valve information. Sizing swing check valves should be sized such that the flow velocity in the line is sufficient to hold the disc in the fully open position. Mug aug conference week january 1519, 2018 new orleans. During each closing stroke, immediately prior to the disc seating, each disc rotates a few degrees in the plane of the seats. Adding anchor for a link for a specific section of the document. Anchor for a link for a specific section of the document. Our discussions with both system operations and plant maintenance personnel revealed that the damage is the result of two separate operating modes not identified in the original.
Valve repair fundamentals, knowledge worth sharing, anchor darling double disc gate valve. Evenct flowserve pdf catalogs technical documentation. New double disc gate valve assemblies incorporating the redesign are also available. Anchordarling double disc gate valve wedge pin and stemdisc separation failures addressees all holders of an operating license or construction permit for a nuclear power reactor under title 10 of the code of federal regulations 10 cfr part 50, domestic licensing of.
Anchor darling double disc gate training track, flmug summer 2012 pressure seal maintenance and. Effects on fatigue life of gate valves due to higher torque. Linking from a web page to a specific section anchor in pdf. This will have no serious effect on the main steam isolation valve as the vent line is sized to restrict steam flow and permit the main steam isolation valve to close.