ASME Section XI: Rules For In-Service Inspection of Nuclear Power Plant Components

Scope

ASME Section XI comprises three divisions, each covering rules for inspection and testing of components of different types of nuclear power plants. These three divisions are as follows:

• ASME Section XI, Division 1: Rules for Inspection and Testing of Components of Light-Water-Cooled Plants
• ASME Section XI, Division 2: Rules for Inspection and Testing of Components of Gas-Cooled Plants
• ASME Section XI, Division 3: Rules for Inspection and Testing of Components of Liquid-Metal-Cooled Plants.

Since the publication of the first edition of ASME Section XI in 1971, significant changes and additions have been incorporated, and as such, the organization of the later versions of ASME Section XI, Division 1, is considerably different from that of the first edition.

Read More

ASME Section IX: Welding And Brazing Qualifications

Scope

ASME Section IX consists of two parts—Part QW and Part QB—which deal with welding and brazing, respectively. In addition, ASME Section IX contains mandatory and nonmandatory appendixes.

ASME Section IX requirements relate to the qualification of welders, welding operators, brazers, and brazing operators and the procedures used in welding and brazing. They establish the basic criteria for welding and brazing observed in the preparation of welding and brazing requirements that affect procedure and performance.

Read More

ASME Section VIII: Pressure Vessels

Scope

The rules of ASME Section VIII constitute construction requirements for pressure vessels. Division 2 ofASME SectionVIII delineates alternative rules of construction to Division 1 requirements. However, there are some differences between the scopes of the two divisions. Recently added Division 3 provides Alternative Rules for Construction of High-Pressure Vessels.

Read More

ASME Section V: Non-Destructive Examination

Scope

ASME Section V comprises Subsection A, Subsection B, and mandatory and nonmandatory appendixes. Subsection A delineates the methods of nondestructive examination, and Subsection B contains various ASTM standards covering nondestructive examination methods that have been adopted as standards. The standards contained in Subsection B are for information only and are nonmandatory unless specifically referenced in whole or in part in Subsection A or referenced in other code sections and other codes, such as ASME B31, Pressure Piping Code. 

Read More

ASME Section III: Nuclear Power Plant Components

Scope

Division1of ASME Section III contains requirements for piping classified as ASME Class 1, Class 2, and Class 3. ASME Section III does not delineate the criteria for classifying piping into Class 1, Class 2, or Class 3; it specifies the requirements for design, materials, fabrication, installation, examination, testing, inspection, certifi- cation, and stamping of piping systems after they have been classified Class 1, Class 2, or Class 3 based upon the applicable design criteria and Regulatory Guide 1.26, Quality Group Classifications and Standards for Water-Steam, and Radio-Waste- Containing Components of Nuclear Power Plants. 

Read More

ASME Section II: Materials

Scope

ASME Section II consists of four parts, three of which contain material specifications and the fourth the properties of materials which are invoked for construction of items within the scope of the various sections of the ASME Boiler and Pressure Vessel Code and ASME B31, Code for Pressure Piping. Therefore, ASME Section II is considered a supplementary section of the code.

Part A: Ferrous Material Specifications: Part A contains material specifications for steel pipe, flanges, plates, bolting materials, and castings and wrought, cast, and malleable iron. These specifications are identified by the prefix SA followed by a number such as SA-53 or SA-106.

Read More

ASME Section I: Power Boilers

Scope

ASME Section I has total administrative jurisdiction and technical responsibility for boiler proper; refer to following given figure. The piping defined as boiler external piping (BEP) is required to comply with the mandatory certification by code symbol stamping, ASME data forms, and authorized inspection requirements, called Administrative Jurisdiction, of ASME Section I; however, it must satisfy the technical requirements (design, materials, fabrication, installation, nondestructive examination, etc.) of ASME B31.1, Power Piping Code.

Read More

Asme Boiler Aand Pressure Vessel Code Sections

The ASME Boiler and Pressure Vessel Code contains 11 sections:

Section I Power Boilers

Section II Material Specifications

Section III Rules for Construction of Nuclear Power Plant Components

• Division 1 Nuclear Power Plant Components
• Division 2 Concrete Reactor Vessel and Containments
• Division 3 Containment Systems and Transport Packaging for Spent Nuclear

Fuel and High-Level Radioactive Waste

Read More

Types of Bolting with It's Specifcations

Bolting material for cast-iron flanges is listed in ASME B16.1. Generally, ASTM A307, grade B material is suitable. For steel flanges, acceptable bolting material is listed in ASME B16.5.

Threading: Bolts and nuts normally are threaded in accordance with ASME B1.1 Standard for Unified Screw Threads. In diameters 1 in and smaller, Class 2A fits on the bolt or stud and Class 2B on the nut applies with the coarse thread series. In diameters 1¹⁄₈ in and larger, the eight-pitch-thread series applies with the same fit. Grade 7 bolts are threaded by roll threading after heat treatment. Roll threading cold-works the surface uniformly.

Read More

Joining Ductile Or Cast-Iron Pipe - Part 2

This article is in continuation to Joining Ductile Or Cast-Iron Pipe - Part 1. Please go through part 1 before reading this.

Mechanical Screw-Gland-Type Joint

This type of mechanical joint for cast-iron pipe makes use of a coarse-threaded screw gland drawn up by means of a spanner wrench to compress a standard rubber or composition packing gasket. The joint allows from 2 to 7 angular deflection, as well as expansion or contraction without danger of leaks. A lead ring, inserted in the bell ahead of the gasket, seals off the contents of the line from the gasket. The ring also provides an electric circuit through the joint for thawing out frozen underground mains and service lines by the electrical method. The screw-gland joint is used in piping which conveys water, gas, oil, and other fluids at considerable pressure. The gaskets and lead rings are interchangeable with those used in equivalent lines of mechanical joints of the bolted-gland type. A full line of fittings is available for use with screw-gland pipe.

Read More