This Standard provides technical criteria and guidelines for the operation and maintenance of PVHOs and PVHO systems that were designed, constructed, tested and certified in accordance with ASME PVHO-1. (b) This Standard provides technical criteria for the user to establish the serviceability of a PVHO acrylic window under its specific environmental service conditions. Windows in protected environments as well as those in severe environments are addressed. Judicious use of this Standard will allow the user and/or the jurisdictional authority to determine when a PVHO acrylic window requires replacement.

This Standard provides requirements for the design, fabrication, inspection, testing, marking, and stamping of pressure vessels for human occupancy, having an internal or external pressure differential exceeding 2 psi. This Standard also provides requirements for the design, fabrication, inspection, testing, cleaning, and certification of piping systems for PVHOs. A PVHO is a pressure vessel that encloses a human being within its pressure boundary while it is under internal or external pressure that exceeds a 2 psi differential pressure. PVHOs include, but are not limited to, submersibles, diving bells, personnel transfer capsules, decompression chambers, recompression chambers, hyperbaric chambers, high altitude chambers, and medical hyperbaric oxygenation facilities. This does not include nuclear reactor containments, pressurized airplane and aerospace vehicle cabins, and caissons.

This standard establishes planning considerations and practices that apply to Load Handling Equipment (LHE), other associated equipment and activities when moving loads vertically or horizontally. The planning guidance contained in this standard is divided into two categories dependent upon the nature of the load handling activity and the degree of exposure to the issues that impact safety. The categories are designated as Standard Lift Plan and Critical Lift Plan. This standard does not preclude the user of this standard from creating subcategories based on their specific load handling activity considerations.

This Standard provides requirements and guidelines for the establishment and execution of quality assurance programs during siting, design, construction, operation and decommissioning of nuclear facilities. This Standard reflects industry experience and current understanding of the quality assurance requirements necessary to achieve safe, reliable, and efficient utilization of nuclear energy, and management and processing of radioactive materials. The Standard focuses on the achievement of results, emphasizes the role of the individual and line management in the achievement of quality, and fosters the application of these requirements in a manner consistent with the relative importance of the item or activity.

ASME has been defining piping safety since 1922.

ASME B31.12 Standard on Hydrogen Piping and Pipelines contains requirements for piping in gaseous and liquid hydrogen service and pipelines in gaseous hydrogen service. The general requirements section covers materials, brazing, welding, heat treating, forming, testing, inspection, examination, operating, and maintenance. The industrial piping section covers requirements for components, design, fabrication, assembly, erection, inspection, examination, and testing of piping.

This Code is applicable to piping in gaseous and liquid hydrogen service and to pipelines in gaseous hydrogen service. B31.12 is applicable up to and including the joint connecting the piping to associated pressure vessels and equipment but not to the vessels and equipment themselves. It is also applicable to the location and type of support elements, but not to the structure to which the support elements are attached.

B31.12 is presented in the following parts:

(a) Part GR — General Requirements. This part contains definitions and requirements for materials, welding, brazing, heat treating, forming, testing, inspection, examination, operation, and maintenance.

(b) Part IP — Industrial Piping. This part includes requirements for components, design, fabrication, assembly, erection, inspection, examination, and testing of piping.

(c) Part PL — Pipelines. This part sets forth requirements for components, design, installation, and testing of hydrogen pipelines.

It is required that each part be used in conjunction with the General Requirements section but independent of the other parts. It is not intended that this edition of this Code be applied retroactively to existing hydrogen systems.

to this revision include:
  • New Section GR-6.3 for Quality System Functions;
  • New table for Required Nondestructive Examinations added to Chapter IP-10;
  • New paragraphs for Quality Control Examinations, Extent of Required NDE Examainations, Acceptance Criteria, Procedures, and Types of Examination added to Chapter IP-10;
  • Updated references throughout;
  • Equations for thickness of permanent blanks and of straight pipe have been updated.
B31.12 serves as a companion to the other codes in ASME\'s B31 series on Pressure Piping. Together, they remain essential references for anyone engaged with piping.

Careful application of these ASME B31 Codes will help users to comply with applicable regulations within their jurisdictions, while achieving the operational, cost and safety benefits to be gained from the many industry best-practices detailed within these volumes.

manufacturers, designers, operators, owners and inspectors of hydrogen piping and pipelines, plus all potential governing entities.

The scope of BPVC Section III, Division 5 covers high temperature gas-cooled reactors, liquid metal reactors and molten salt reactors. Although the primary focus of this document will be on the design and related material considerations for Class A elevated temperature metallic components, the other aspects of BPVC Section III, Division 5 for metallic components will also be briefly addressed.

Volume B30.10 includes provisions that apply to the fabrication, attachment, use, inspection, and maintenance of hooks shown in Chapters 10-1 and 10-2 used for load handling purposes, in conjunction with equipment described in other volumes of the B30 Standard. Hooks supporting a load in the base (bowl/saddle or pinhole) of the hook are covered in Chapter 10-1. Hooks that may be loaded in other than the base (bowl/saddle or pinhole) are covered in Chapter 10-2.

, while achieving the operational and safety benefits to be gained from the many industry best-practices detailed in these volumes.

manufacturers, owners, employers, users and others concerned with the specification, buying, maintenance, training and safe use of slings and hooks with B30 equipment, plus all potential governing entities.



This Standard for cast iron threaded drainage fittings covers
(a) sizes and method of designating openings in reducing fittings
(b) marking
(c) material
(d) dimensions and tolerances
(e) threading
(f) ribs
(g) coatings
(h) face bevel



This Standard covers fittings intended for use in gravity drainage systems subject only to the gravity head of waste liquids at temperatures from ambient to approximately 100°C (212°F). The use of this Standard for pressurized waste handling systems is the responsibility of the user and is subject to the requirements of any applicable code.

The purpose of this Code is to measure the electric power consumption associated with a specified performance condition of a blower package referred to as wire-to-air performance.

Blower packages shall include but not be limited to dynamic and rotary positive displacement (PD) types and the ancillary devices required for operational service. This Code determines total input electric power consumption (herein referred to as wire power) and delivery of compressed air from the blower package to the defined system boundary.

The scope of this Code is limited to wire-to-air performance testing of blowers in a controlled environment and does not include field testing. The term "blower" implies that the machine is used primarily for delivery of air at pressure ratios equal to or less than 3.0. This Code does not include procedures for determining the blower system\'s mechanical and acoustical characteristics, nor is it applicable to machines employing forced interstage cooling.

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