Welcome to Essay Writing Service OrderEssay.net

Choose from a great number of disciplines, deadlines, and corresponding academic levels. Our experienced writers will provide you with original papers written in accordance with your specific requirements.

All you need to do is to submit your paper instructions, proceed with the payment, and wait for your assignment to be delivered right on time.

June 25, 2013

Standard Maintenance Procedure

Introduction
Masoneilan currently has very skilled employees in the department which deals with after sales. The department is available for start-up maintenance and repair of valve and component parts. One can make arrangement for these services through one’s local Masoneila Representative from after-sales department. When performing maintenance, it is advisable to use only Masoneilan replacement parts. These parts are available in local Mosaneilan Representatives. One can access services from spare Part Department. When making an order for a specific part, always include both Model and Serial number of the unit ordered.

General Information

Generally, the installations and maintenance apply to all sizes and ratings of the Masoneilan 21000 Series control valves. This is true regardless of the type of of trim a customer use. Masoneilan designed 21000 Series single ported top guided valves with built in versatility. This makes them suitable to handle a large range of process applications. In standard construction, they offer a contoured plug having either seat ring with threads or a quick change seat ring. They have heavy top plugs guiding, which offer maximum support to ensure that plugs are stable. A series of reduced area trim is available. It provides a large range of flow ability in all sizes of valves.

Reference Documents
The reference table on page 14 lists the recommended spare parts needed for maintenance. Recommended spare parts required for maintenance are listed. The table contains the model number, size of the valve, rating and serial number of the valve. This is shown on the identification tag located on the actuator. For the numbering system of the 21000 series, refer to the figure. Access to the internal parts of the should be accomplished with the actuator removed. In order to remove the actuator from the body, refer to the instruction about the actuator. They are available in the instruction No ER8788 for a type 87/88 multi-spring actuator.

Safety, Health and Environment
The user should review the following instructions and understand them preceding to installing, performing maintenance of the equipment. Strictly instructions must be adhered to, otherwise, stern injury or malfunction of the equipment could result. When using heating devices, observe proper safety practices. The user must consider flammability and toxicity of the process fluid and should take proper precautions taken. Avoid over-lapping as this can cause damage to the seating surface rather than improve leakage performance.

Packing box should be clean and free of burrs, rust, and any foreign matter. The user can clean parts with denatured alcohol. Ensure that any lubricant used is compatible with service conditions. One must take extreme care in order to prevent scoring or marring this surface. Failure to do so could result in damage to the guide bushing and destruction of the plug. Two flats are provided for holding. When using a vise to hold the plug, one should take extreme care not to damage the plug shank. The user must tighten the plug tip, allow it to set for approximately 4 hours, re-tighten it, allow it to set another 4 hours, then tighten it one more time. The purpose of this tightening sequence is to allow the insert material to “cold flow” into place on the plug sub-assembly. Do not over-tighten or strike seat ring lugs directly as this could distort the seat ring resulting in unwarranted seat leakage.

Precaution should be taken when installing cage. The cage should be installed with parts at lower end, near seat ring. Tighten nuts (10) until metal to metal contact is obtained with proper bolt torque. The user can refer to Figure 11 for proper bolt torque and tightening sequences specifications. Tighten nuts (10) until metal to metal contact is obtained with proper bolt torque. Refer to Figure 11 for proper bolt torque and tightening sequence specifications. Always use soft metal vise jaws to hold the plug guide surface. Failure to take this precaution could result in damage to the plug guide surface during pinning. Care has to be taken not to damage the seating surfaces of the bellows bushing. For instance, assembly of the No. 6 actuator on a bellows seal valve requires a three-sectioned coupling. Follow coupling instructions as described for the No. 10, 16 and 23 actuators. The bellows assembly causes a spring back effect. Measure this plug spring back before referring to Instruction No. ER 8788. Be sure to add this spring back length to the over seat adjustment. This precaution will help in handling any part of the 21000 series.

Other Requirements
Apart from the normal precautions that one has to take during installation, in order to safely protect himself and his surroundings, the following requirement are also necessary. The first requirement is the unpacking safety measures. One must exercise care when unpacking the valve. This prevents damage to the accessories and component parts. Should any problems arise, it is advisable to contact the local Masoneilan Representative or After Sales Department. The second requirement is that installation process should follow the right procedure. Before installing the valve in the line, clean piping and valve of all foreign material like welding chips, scale, oil, grease or dirt.

One should thoroughly clean the gasket surfaces to insure leakproof joints. In order to allow for inline inspection, maintenance or removal of the valve without service interruption, provide a manually operated stop valve on each side of the 21000 Series valves. This should include a manually operated throttling valve mounted in the bypass line (See Figure 2). The valve must be installed so that the controlled substance will flow through the valve in the direction indicated by the flow arrow located on the body. The last requirement is about the body assembly. Access to the internal components of the body should be accomplished with the actuator removed. To remove the actuator from the body, refer to the actuator instruction No ER8788 for a type 87/88 multi-spring actuator. These requirements are not only important in safeguarding the user but also protect the environment against pollution and prevent the destruction of valves and their components.

Actuators are designed to accept 1/4″ NPT air supply piping. Use 1/4″ OD tubing (4 x 6 mm) or equivalent for all airlines. If the supply airline exceeds 25 feet in length, or if the valve is equipped with volume boosters, then 3/8″ tubing (6 x 8 mm) is preferred. AII connections must be free of leaks.

Equipment and Special Consumables
Threaded Trims are indicated in figures 12 and 14. Other equipment is called Quick-Change Trim. It is shown in figure 13 and 15.

General Information and Notes
After removing the actuator, disassemble the body using the following procedure. If there is a leak detector connection on the lateral NPT port of the bonnet, disconnect this piping as well. Remove body stud nuts (10). Remove bonnet (8), and plug stem (1) and plug (16) sub-assembly together as one unit. We should note that spiral wound body gaskets (11) are standard found in the 21000 Series design and it is imperative that a new gasket be installed whenever valve is disassembled. Remove packing flange stud nuts (3), packing flange (4) and packing follower (5). Remove plug (16) and plug stem (1) sub-assembly from the bonnet (8). Remove old packing (6) and optional lantern ring (7). The user can do this if a leak detection connection has been installed. With reference to figure 5, Bonnet (8), plug (16), bushing (12), and seat ring (14), one may now be inspected for wear and service damage. After determining the maintenance required, proceed to the appropriate section of this instruction manual.

The user can perform the following procedure when handling on the Quick-Change Trim. Following removal of the actuator, disassemble the body using the following procedure: If there is a leak detection connection on the lateral NPT port of the bonnet, disconnect this piping as well Remove body stud nuts (10). Remove bonnet (8), and plug stem (1) and plug (16) sub-assembly together as one unit. Since the cage (13), seat ring (14) and seat ring gasket are held in place by the bonnet, they may now be removed. Note : Spiral wound gaskets (11 & 15) are standard contained 21000 Series design and it is imperative that new gaskets be installed whenever the valve is disassembled. Remove packing flange stud nuts (3), packing flange (4) and packing follower (5). Remove plug (16) and plug stem (1) sub-assembly from the bonnet (8). G. Remove old packing (6) and optional lantern ring (7) if a leak detection connection has been installed. With reference to figure 5, All components may now be inspected for wear and service damage. After determining the maintenance required, proceed to the appropriate Section of this instruction, give the procedure of using the equipment.<…>

Attachment
The purpose of this section is to provide recommended maintenance and repair procedures. These procedures assume the availability of standard shop tools and equipment. We begin with the Plug/Stem Bellows/Bonnet Extension S/A. Plug stem pinning in the field may be required for: replacing existing plug plus stem-bellows S/A, changing stem-bellows S/A only. It is applicable if the plug needs replacing, the stem-bellows sub-assembly should be replaced at the same time. The original pin hole in a stem which is being reused sometimes prevents a satisfactory result being obtained and can also weaken the plug-stem assembly. If the stem-bellows sub-assembly is being replaced, the new assembly can be fitted with an existing plug, as long as it is in good condition and the removal of the pin has not deformed the hole or damaged it in any other way. The user should take not to spoil the plug seating surface during pin removal and assembly operations.

The second components is the unpinning the Plug Stem. Pull as well as hold the plug (16) out of the bonnet extension (29) in order to allow access to the plug pin (17). Place the plug guide on a V-block. One should note that a lower mechanical stop has been provided to prevent damage of bellows during this step. Using a drift punch, drive out the existing pin (17). Again, if it is necessary to drill out the pin, use a drill bit slightly smaller than the pin diameter. Be careful not to damage the hole of the plug guide. Lock two nuts beside each other at the end of the plug stem, and make use of a flat spanner on lower nut to prevent rotation while unscrewing the plug from the stem. The plug is removed by turning it counter-clockwise. Remove the two nuts from the plug stem.

The next thing is to complete the previous step by doing the following. Inspect the parts and carry out any necessary repairs, then reassemble the stem-bellows sub-assembly (30) through the upper hole in the bonnet extension (29). The guidelines on this repair work is in seeing section 10.2.1.2 of the manual. Mounting of the Plug-Stem/Bellows S/A into the Bonnet Extension is very important. You need to clean all contact surfaces of the bonnet extension (29) and the plug-stem/bellows S/A. Assemble a new gasket (28) on the upper flange of the bonnet extension. Insert the new stem-bellows S/A through the top hole onto the bonnet extension (29). This procedure is again available in section 10.2.1.3.

Rationale Behind Procedure Revision
Leading brand names include retail fueling systems, natural gas-fired engines, Masoneilan control valves, Mooney regulators, and Consolidated pressure relief valves. In addition, it includes roots blowers and rotary gas meters. It has developed and customer service services located strategically across the world with sales presence in more than 100 countries. With its variety of products, unsurpassed global presence and superior process control expertise, Dresser Masoneilan is uniquely situated to be the leading provider of flexible, best fit control valve solutions. Supported by an incorporated network of sales offices, it provides the widest range of valve solutions and services for virtually every process control application.

1 Star2 Stars3 Stars4 Stars5 Stars (No Ratings Yet)
Loading...

This is a great example of the way one should write a top-notch PhD level essay. Nevertheless, you may not employ the parts of this article into your piece of writing as your paper will appear as plagiarized. It is highly recommended to avoid the usage of free samples or any Internet content that cannot be cited properly. Using such information may threat you academic performance or even be a reason of expulsion. Therefore, a great idea is to turn to the online writing service, which provides the papers written from scratch by the professional writers. Our writers specialize in a great variety of subjects and grant 100% originality. Moreover, every order goes through the plagiarism detection software, which lets us spot the plagiarism before the assignment is sent to you and resolve the issue immediately. Get started now and you will never regret it!

Place
new order
How
it works?
Call-toll free:

1 866 607-34-46

Phone working hours:
Mon 00:00 — Sat 13:00 (GMT)
Categories
Archive
Writing Features:
  • Prices starting at just $10/page
  • Overnight delivery option
  • Free revisions according to our Revision Policy
  • A team of experienced writers
  • Money back guarantee
Current Activity:
  • 296 writers active;
  • 8.5/10 current average quality score;