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 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 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
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
Acceptability of materials is highly dependent on the specific application. Applied stress levels, exposure to contaminants, the operating temperature, the partial pressure, and number and magnitude of material stress cycles are some of the factors that affect material selection. Guidance is provided within documents such as ISO 11114, Gas cylinders - Compatibility of cylinder and valve… Category: Piping Keywords: Material Compatibility, Piping, Austenitic Stainless Steel, ASME Standards
Hydrogen has been transported safely through pipelines for over 50 years. There are dozens of pipeline networks in safe operation globally, with several individual networks that approach up to 1000 miles. Significant testing and some demonstration projects are underway to ensure safety. Some of the aspects under investigation include compatibility of the pipe and other materials,… Category: Piping Keywords: Hydrogen Blending, Natural Gas, Pipeline, Material Compatibility
The conversion is based on the condition as determined from a variety of non-destructive techniques which are commonly used for pipeline mechanical integrity programs. Existing natural gas pipelines are frequently evaluated for conversion to hydrogen, hydrogen-natural gas blend, and other fluid services. Category: Piping Keywords: Natural Gas, Pipeline
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