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The new API 618 5th Edition includes many improvements over the 4th Edition in the specification for engineering studies to minimize pulsation and vibration. This provides the changes of The Pulsation, Vibration, Torsional, Skid and Engineering studies. Table 5 will be corrected in the next edition of API 618. June 1995 3.9 618-I-02/01Section 3.9 of API 618 discusses pulsation dampers. There are two equations to calculate the suction and discharge bottle volumes. Equation 7 is given to calculate the peak-to-peak pulsation level in a line. Download Free Api 618 5th Edition Api 618 5th Edition Thank you very much for downloading api 618 5th edition.Most likely you have knowledge that, people have look numerous time for their favorite books once this api 618 5th edition, but end stirring in harmful downloads. Gas Field Policy 22: API 618 Comments & Exceptions, 5th Edition (December, 2007) Dresser-Rand builds compressors in basic compliance with this edition of API-618. Our experience has shown that a few of the requirements do not add commensurate life or reliability and therefore the following clarifications are indicated. DRESER-RAND VIP COMPRESSORS. The terminology and context for this application note are American Petroleum Institute (API) Standard 618, 4th edition and 5th edition2. Previous editions of API 618 used other descriptions and definitions for rating values of reciprocating compressors. For ease of reference, the terms and definitions used herein appear at the end.
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The proposed Fifth Edition of API 618 (“Reciprocating Compressors for Petroleum, Chemical, and Gas Industry Services”) incorporates significant changes in the section concerning pulsation and vibration control. There are still to be three “design approaches,” but the requirements to perform certain analyses that were presented as optional in the Fourth Edition will now be dependent on pressure pulsation and for levels determined from the acoustical simulation. The confusion concerning when piping forced mechanical response calculations should be performed, which originated in the Fourth Edition, has been eliminated; forced response calculations are not required to satisfy API 618 Fifth Edition when pulsation levels are controlled properly. A separate article on pulsation and vibration control is being developed by the API 618 sub-task force on pulsation and vibration control as an appendix (annex) to API 618. This text will be a stand alone “RP” (Recommended Practices) document in the API system, which would then by referenced by API 618 as well as other API standards (e.g., API 674 for Positive Displacement Pumps) for which pulsation and vibration control are an issue. This document, to be issued in 2002, will discuss the different design philosophies inherent to the new edition of the standard. The purpose of this tutorial is to provide the user with a working knowledge of good engineering practices for pulsation and vibration control of reciprocating machinery in relatively high mole weight gases (e.g., natural gas), as well as an indepth understanding of the proposed changes in API 618 and the differing design philosophies. Several case histories are used to illustrate why robust pulsation control is important for reciprocating compressor piping systems. The authors are members of the API 618 sub-task force on pulsation and vibration control and each has over 20 years of experience in this field.
Cameron’s SUPERIOR high speed reciprocating compressors and engines are well known for their high quality and high reliability. Industries that may require such reciprocating compression equipment to meet API 618 minimum standards such as Petroleum, Chemical and Gas can now partner with Cameron. The API 618 standard referenced here is the 5th edition, issued December 2007.
When recently approached to provide a high speed reciprocating compressor for an API 618 process application, Cameron quickly found that most specification requirements were already in the SUPERIOR product offering. The main reason for this is that both API and Cameron have the same objective when considering minimum requirements for compressors: high reliability that minimizes down time.
A general requirement of the equipment covered by the API 618 standard is that it is to be designed and constructed for a minimum service life of 20 years and at least 3 years of uninterrupted operation with some exceptions for wearing parts. This design standard requires the equipment manufacturer to be committed to long term quality standards. SUPERIOR has met this standard over and over again, with hundreds of compressors in the field that have been running for decades.
Certain process applications require non-lubricated cylinders to prevent oil from contaminating the gas. Non-lubricated cylinders eliminate the cost of replacing the lubrication fluid regularly, but consideration must be made for the wear on the cylinder and piston rings. SUPERIOR’ssolution is a Teflon® coated running bore to extend the life of the piston rings. API 618 sets a predicted discharge temperature not to exceed 275oF (135oC) for these non-lubricated cylinders, and the standard maximum discharge temperature for lubricated cylinders is 300oF (150oC). SUPERIOR has a full line of both lubricated and non-lubricated cylinders that meet the API 618 specifications for temperature in sizes that range from diameters of 3.125” (80mm) to26.5” (648mm).
Cylinder standards set by API 618 specify that each cylinder must have a replaceable dry-type liner and be designed to enhance heat transfer and dimensional stability. SUPERIOR has a full line of lined cylinders to meet this minimum requirement and adds adds Teflon® to the cylinder liner to enhance the performance and durability of cylinder liner.
API 618 specifies water cooling systems as a minimum requirement. The advantage of water cooled cylinders is the ability to lower operating temperatures preventing overheating of the piston seals and increasing the packing life. SUPERIOR has a full line of water cooled cylinders that meet these core requirements but also offers a full line of air cooled cylinders.
The current API 618 specifications for the piston rods require that all piston rods, regardless of base material, be coated with a wear resistant material. The purpose of this is to reduce rod surface wear and extend the pressure packing life. SUPERIOR’s standard is a Tungsten Carbide coating, and as specified in API 618, the piston rods are continuously coated from the piston rod packing through the oil wiper travel areas.
API 618 requires that base material for piston rods be in compliance with NACE MR0175 when used in H2S applications. SUPERIOR components are in compliance with NACE to handle H2S and CO2. These quality parts are resistant to corrosion from sour gas without special trim, which is often required in process gas applications.
Api 618 5th
Double-acting cylinders are preferred by API 618 as the most efficient with compression occurring on both sides of the piston during both the advancing and retreating stroke. If accepted by the customer, single acting, step piston or tandem cylinder arrangements may be provided, but special care must be given to ensure rod load reversals are as specified in API 618. SUPERIOR offers double-acting cylinders as standard equipment and also has an extensive variety of cylinders available to fit any application.
Construction of wear rings must be designed to prevent underside pressurization (acting similarly to piston rings). They also need to be segmented to facilitate installation and be made from wear resistant material. API 618 further specifies that for non-lubricated horizontal cylinders, the bearing load calculated from the equation below on nonmetallic wear rings shall not exceed 5 lbf/in2 (0.035 N/mm2) based on the mass of the entire piston assembly plus half the mass of the rod divided by the projected area of a 120o arc of all wear rings. SUPERIOR cylinder double rider rings meet API 618 maximum contact pressure.
LB = (MPA + (MR/2)) / (0.866 x D x W)
where,
- LB is the bearing load on wear rings in 5 lbf/in2 (0.035 N/mm2)
- MPA is the weight of the piston assembly lbf (N)
- MR is the weight of the piston rod lbf (N)
- D is the cylinder bore diameter in in. (mm);
- W is the total width of all wear rings in in. (mm);
There are many API 618 specifications that must be considered for a compressor in a process application. Several have been pointed out in this article with the objective of highlighting the benefits to the end user. When API 618 requirements are met, reliability, longevity and reduced down time will result, saving the end user money over the life of the compressor. SUPERIOR reciprocating compressors are designed with such quality and reliability making them is a perfect fit for process applications requiring API 618 specifications.
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