Monday, December 23, 2013

Use of Codes And Standards in Piping System Design

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In practice, the assurance that the design and construction of a piping system will meet prescribed pressure-integrity requirements is achieved through the use of published codes and standards. Numerous codes and standards have been formulated and published by major interest groups of the piping and pressure vessel industry. The most widely used codes and standards for piping system design are published by the American Society of Mechanical Engineers. The American National Standards Institute (ANSI) accredits many of these codes and standards.


Sunday, December 22, 2013

Definition of The Term Design Bases

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Design bases are the physical attributes, loading and service conditions, environmental factors, and materials-related factors which must be considered in the detailed design of a piping system, to ensure its pressure integrity over its design life.

Physical Attributes

Physical attributes are those parameters that govern the size, layout, and dimensional limits or proportions of the piping system. Dimensional standards have been established for most piping components such as fittings, flanges, and valves, as well as for the diameter and wall thickness of standard manufactured pipe. Those standards are identified in the section ‘‘Use of Codes and Standards in Piping System Design.’’

Monday, December 9, 2013

Piping Supports - Reference Codes and Standards

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INTRODUCTION

The correct and economical selection of the supports for any piping system usually presents difficulties of varying degrees, some relatively minor and others of a more critical nature. Proper support selection should be the objective of all phases of design and construction.

Many pipe support problems may be minimized or avoided if proper attention is given to the means of support during the piping layout design phase. The piping designer’s familiarity with support problems, accepted practices, and commercially available pipe support components and their applications is extremely important.

Saturday, December 7, 2013

Types of Piping Joints

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Joint design and selection can have a major impact on the initial installed cost, the long-range operating and maintenance cost, and the performance of the piping system. Factors that must be considered in the joint selection phase of the project design include material cost, installation labor cost, degree of leakage integrity required, periodic maintenance requirements, and specific performance requirements.

In addition, since codes do impose some limitations on joint applications, joint selection must meet the applicable code requirements. In the paragraphs that follow, the above-mentioned considerations will be briefly discussed for a number of common pipe joint configurations


Wednesday, December 4, 2013

Types of Flange Faces Commonly Used

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There are five types of flange faces commonly found. The surface finish of the faces are specified in the flange standards.

Raised Face (RF)

The raised face is the most common facing employed with bronze, ductile iron, and steel flanges. The RF is ¹⁄₁₆-in high for Class 150 and Class 300 flanges and ¹⁄₄-in high for all pressure classes, higher than Class 300. The facing on a RF flange has a concentric or phonographic groove with a controlled surface finish. Sealing is achieved by compressing a flat, soft, or semimetallic gasket between mating flanges in contact with the raised face portion of the flange.

 

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