Work instruction for valve

This RPR cover repairing or refurbishing of end user’s (owner’s) valves for continued service in the owner’s production applications. It does not cover repair or refurbish of used surplus valve intended for resale. Repaired or refurbished valve may not meet API and/or the MEMO standards requirements for new valves. The owner is responsible for the correct application of valve repaired or refurbished per this document. Fields repair is outside the scope of this document. References Documents The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For date references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements base on this standard are encouraged to investigate the possibility of applying the most recent editions of the documents listed below. For undated references, the latest edition of the document referred to applies.

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Referenced standards may be either the applicable edition shown herein or the latest revision, provided the reconditioned can show that the latest edition meets or exceeds requirements of the specific edition listed. When the latest is specified, it may be used on issued, and shall become mandatory six month from the date of the revision. API spec AD Petroleum and Natural Gas Industries-pipelines Transportation Systems-pipelines valves GAMES Section V Section IX ASTM

The new identifier number shall be stamped on body, bonnet, cover, closure member, seats (if removed), stem and any other major components, using low stress stencils. If stamping is not practical, parts may be tagged or electro etched, except that all stems and closure elements for valves 2 in. And larger valves shall be marked by stamping. Identification numbers marked on parts shall remain on the parts throughout the reconditioning process. Smaller part may be placed in a container labeled with the unique identification number. Valve Parts List 1. After the valve has been removed from the line, place the valve in the vertical position with the valve body section (14) on the bottom. Remove body stud nuts (18).

Be careful to protect the machined faces. Lift off end adapter (13). 2. Using gear operator, rotate the stem and ball to the closed position and lift out the ball (17). 3. Remove gear operator mounting screws (9). Pull gear operator off of mounting plate (6). 4. Remove stem retainer ring (5) and stem key (4). Carefully file outside of stem to remove any burrs or permanent damage to stem bore can occur. 5. Push stem (12) down into body housing and remove. . Remove all seats, seals and O-Rings, part numbers (10), (1 1), (1 5), (16). B) Seat Reconditioning (metal seated) procedure 1. Ensure that the work area is clean. Have several lint-free wipes open-end and ready for use. 2.

If done properly, you should feel a suction or “popping” effect. Avoid removing it horizontally or “turning” it off at 8. Clean the disc surface and the entire lap (top, bottom and sides), using an approved cleaner/degrease. Let each part evaporate dry. Do not wipe dry. ) Ball reconditioning: Ball chroming procedure 1. Receiving and Inspection. The first step is to determine the condition of the ball and identify what should be done to the ball where metal can deteriorate and corrode to a point where restoration is outrageously expense. Next, both companies must agree on a price, level of quality and expected completion date before ball reconditioning started. 2. Striping.

Parts are stripped to bare metal; all paint, dirt, oil and grease, rust, old plating and any other foreign material must be removed. 3. Polishing. Polishing is the removal of surface metal using a series of abrasive wheels and ending belts. This section started by using coarse-cutting grinders, and then working down to soft cloth buffs. The end result is a high-gloss polished metal part with all pitting, scratches and impurities removed. 4. Wiring and Racking. Hold parts in the plating tanks by using hooks, racks, copper wire and other methods. It will provide electrical contact to the part. 5. Cleaning. Ensure the parts are surgically clean before plating.

The slightest spec of dirt, grease, oil, buffing compound, rust, or other foreign matter will cause a reject. An elaborate series of soap, acid and water solutions is used to guarantee a clean and spotless reface. 6. Copper Plating and Buffing. Parts are copper plated and then buffed too brilliant shine. This is an important step fill-in polishing lines and pits. 7. Wiring, Racking and Re-cleaning. The processes of steps 4 and 5 are repeated before nickel plating. 8. Nickel Plating. It is the nickel which provides the deep luster of a chromed part, in addition to providing another layer of protection for long-lasting chrome. Parts remain in the nickel plating tank for about an hour. 9. Chrome Plating.

Chrome plating the final plating step where it is actually a protective coating over the hint nickel which prevents the nickel from tarnishing. 10. Final Inspection. Parts are cleaned and inspected. On the other hand, some parts may require minor buffing. 5 Replacement Parts and Materials Source of replacement parts shall be one of the following: a. Suitable replacement part from the MEMO. B. Parts obtained from similar valves from the same valve manufacturer. The material must be identified, and critical dimensions verified to be the same as the original component. C. Manufactured or repaired component parts, from the recondition facility. These parts shall be made from material equivalent to the original.

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