Critical piping
Critical piping
(OP)
How is critical piping defined?
How is it differentiated from Non-critical piping?
What code is used for the design of Critical piping?
How are allowable stress values different for these two types?
How is it differentiated from Non-critical piping?
What code is used for the design of Critical piping?
How are allowable stress values different for these two types?





RE: Critical piping
PS: B31.1 doesnt differentiate in critical as it dont knows critical piping.
RE: Critical piping
- Duplicates, or replaces without significant changes, a system operating with a successful service records;
- Can readily be judged adequate by comparison with previously analyzed systems;
- Is of uniform size, has no more than two points of fixation, no intermediate restraints.
The non-critical lines usually are:
- Non-hydrocarbon lines such as air and utility water
- All lines which discharge to atmosphere including fire case relief and vent lines (excluding other relief and vent scenarios)
- All lines within skid mounted packages (which are the responsibility of package vendors)
- All small diameter piping (40mm and below) unless subjected to surging such as relief and blowdown
- All piping connected to open drains
- All piping connected to closed drains
- Lines that have similar configuration or mirror image to those that have been analyzed and satisfy the pipe flexibility.
Classification of the remaining piping systems considers: service conditions, size, and temperature range - into Class I and Class II of critical piping. But, as others have said, the term "critical" can be applied based on many different criteria.Dejan IVANOVIC
Process Engineer, MSChE
RE: Critical piping
RE: Critical piping
I am working on a boiler piping
RE: Critical piping
Failure potentially causes excessive monetary, property, or environmental damages, or loss of life.
Failure causes excessive damage to company brand, or excessive stock price decline.
Reduces sales by more than 25%.
Causes failure to supply contracted quantity.
RE: Critical piping
In a nuclear power plant, designers use a gradient of importance for critical systems. They have three ASME Safety Classes (1,2,3) designations plus non-critical piping.
This may help:
https://mceer.buffalo.edu/publications/workshop/01...
MJCronin
Sr. Process Engineer
RE: Critical piping