This guide includes recommendations for inservice inspection and recertification of ground based , unfired pressure vessels and all pressurized systems including those served by fired pressure vessel shere inafter referred to as pressure vessels , systems and components of systems .

It covers the vast array of ground based industrial and special purpose pressurized components and systems used at NASA field installations for research and development and those utility systems and components that require more than routine maintenance to insure continued structural integrity for thei usefullife . Through surveillance and correction of inservice deterioration , NASA will maintain a safe working environment for their own and contractor personnel , safety for the public sector and protectionagainst loss of capitalinvestment.

Items excludedfrom this guide , are defined in Chapter 2

Coverage includes test methods , system and component categorization , recertification procedures and documentation , and inserviceb inspection to support and maintain certification status . Recommended documentation forms are included in Appendix A.

THIS GUIDE DOES NOT REPLACE EXISTING ROUTINE OPERATIONS AND MAINTENANCE INSPECTIONS. System and component checks must be made on a continuing systematic basis at the beginning of each shift , periodically during runs , weekly or at other intervals of time , based on service history and criticality . Such checks are normally visual and audible to evaluatechanges related to vibration or gas leaks checks of instrumentation , etc . , for indicationsof potential failures . Protective coatings on pressurized components must also be maintained on a continuingbasis .