scope:

PURPOSE

The purpose of this document is to ensure the structural integrity of PVS through implementation of a minimum set of requirements for ground-based PVS in accordance with this document, NASA Policy Directive (NPD) 8710.5, NASA Safety Policy for Pressure Vessels and Pressurized Systems, NASA Procedural Requirements (NPR) 8715.3, NASA General Safety Program Requirements, applicable Federal Regulations, and national consensus codes and standards (NCS).

APPLICABILITY

This standard applies to NASA Headquarters and NASA Centers, including Component Facilities, and to the Jet Propulsion Laboratory and to other contractors to the extent specified in their contracts

This standard applies to all ground-based equipment designed for, or operating at, positive or negative gauge pressure that is not specifically excluded in Paragraph 4.2. It applies to NASA-owned or -operated, temporary or permanent, ground-based PVS and to non-NASA-owned contractor or tenant ground-based PVS operated on NASA property if that PVS is determined by the Pressure Systems Manager (PSM) to pose a risk to NASA personnel, facilities, or equipment. It specifically includes, subject to Paragraph 4.2, systems often referred to as "low pressure" such as building and facility services equipment (e.g., shop air), laboratory systems, and vacuum systems.

When conflicts exist between this document and NCS, this document shall take precedence, except in those cases where the NCS is invoked by applicable Government regulation (Requirement).

Requirements in addition to, and that do not conflict with, those listed herein may be appropriate for inclusion in Center-specific PVS policies and procedures to address unique applications and situations not covered by this document. As provided for in NPD 8710.5, it is the PSM's responsibility to assure that such additional requirements are developed and included in the Center's certification process.