The HSP recommends against the use of glycols for pressure tests due to the difficulty of adequately removing all glycol that might be left in a system after a hydrotest. The HSP recommends a pneumatic test at 110% of the system maximum allowable working pressure (MAWP), which is acceptable by code. Due to an increased danger with pneumatics vs hydrotesting, establish a pressure test zone for…
The Panel recommends performing a pressure test at 110% of design pressure. This requirement should be applied to all systems regardless of construction type since the intent is to ensure pressure integrity and proper installation. All fitting types have modes of failure during installation. For example, there are numerous examples where compression fittings have had ferrules installed…
The code used for repair and alterations of an existing system depends on the code used for construction as well as on the requirements imposed by the jurisdiction. Note that getting a permit from the jurisdiction may be necessary for an extensive alteration.
| Code of Construction | Generally Accepted Code for Repair and Alterations… Category: Piping Keywords: Piping, Codes
The requirements of the code used for the original construction apply. The piping may meet the requirements of more than one code. In which case, the code used for changing the rating may be different than the original code of construction. In any case, the re-rated system should meet all of the requirements of the selected code. Note that if the original proof test of the system was… Category: Piping Keywords: Codes, Piping, Requirements
At least three of the ASME B31 piping codes are logical choices:
Considerations for code selection include:
Category: Piping Keywords: Piping, Codes, Requirements
NFPA 2 provides Tables in Chapters 7 and 8 that specify the hazardous area classifications surrounding vent stack outlets. These are based on typical vent systems and flows, but are only applicable for smaller systems. The designer of a vent system should apply the principles of documents such as IEC 60079-10-1 (also required by NFPA 2) or NFPA 497 to evaluate larger vent releases where the… Category: Site Planning Keywords: NFPA 2, Hazards, Classification
Guidance for location of vent stacks is provided by NFPA 2, Hydrogen Technologies Code, which also references CGA G5.5, Hydrogen Vent Systems, for additional guidance. Minimum distances to vent stack outlets should be determined from dispersion and radiation analyses. The height of the vent stack and orientation of the release will affect the minimum separation distance. Category: Site Planning Keywords: Vent Stack, Separation Distance, Dispersion, NFPA 2
Dispersion and radiation analysis should be conducted to ensure that the hydrogen cloud will not interfere with the flight path of aircraft. In addition, there may be maximum height requirements due to airport requirements depending on the location of the stack. Category: Site Planning Keywords: Vent Stack, Airfield, Dispersion Analysis
Hydrogen affects the mechanical properties of most materials. For example, hydrogen reduces the Category: Piping Keywords: Pipeline, Material Compatibility, ASME Standards, Pipeline Safety
Because cast irons are relatively brittle materials, they should generally be avoided in industrial and Category: Piping Keywords: Cast Iron, Pipeline, Low-pressure systems, ASME Standards
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