The provider should also be able to provide evidence that
all documentation is meticulously prepared and delivered on
schedule, including welder certifications, weld process
documentation, weld examination reports, material
certifications and traceability, pressure test results, pipe
pressure and other stress calculations, pipe support stress
calculations, pressure calculations for any unlisted
components, and bolting calculations (if required).
Before ordering from any provider, it is also prudent to
request to see references of previous work. If possible, visit a
system installed by the prospective provider and interview
the owner. Touring the provider’s facility is also advisable, in
order to ensure that a code compliant system will likely be
delivered.
During the manufacture of any complex pipe system, it is
also beneficial to conduct an in-process inspection of the pipe
system to ensure that codes are being followed.
Finally, the authors strongly recommend preparing a
comprehensive list of the pipe system requirements and
producing a signed agreement listing the expected system
parameters, performance, and deliverables as part of the
purchase order. This should include as much detail as possible
to eliminate later surprises.
By purchasing from a proven qualified provider and
requiring code compliant pipe and pipe systems, much of the
risk can be removed from pipe carrying LNG and other
flammable and oxidising fluids.
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Case study
Technifab entered the LNG field in 2000 by executing a
project for the US Department of Energy (DOE) to develop
and test vacuum insulated LNG vessels. These vessels
were designed for the rigours of on highway use on large
trucks and buses. The development work included vacuum
insulated vessels and the engine fuel delivery system.
At the completion of the DOE project and using the
experience gained, the company began building vacuum
insulated pipe systems to carry LNG.
Conclusion
For the operation of a safe piping system, it is essential
that the piping is built by experienced and reliable
providers. The owner must be actively involved by
ensuring that the design requirements and inspection
needs are clearly established. The owner must provide
all necessary information including specific inspection
requirements, duty cycle, pipe system environment, and
life expectancy.
References
1.
Company_Explosion?rec=1605
2.
table_australian_international_standards.pdf
3. ‘ASME B31.3 Process Piping Code’, (2016).
