3.14), weld/braze procedure specification and qualification (Section 3.7), and/or welder/brazer performance qualification (Section 3.8) shall be considered by the RE and required where applicable. For the case of unlisted (special) material(s), see Section 3.13.3.14).4.4) according to a written procedure. Welding and brazing performed by Jefferson Lab employees shall be examined by personnel approved by the Jefferson Lab designated QA/CI Inspector.
1 Pressure/Vacuum System Weld Classification
A (in2) |
P (psi) |
CODE |
|
Pressure Vessel |
>
28.8 |
< -15, > 15 |
ASME B&PV |
Pressure Vessel-Water |
>
28.8 |
> 300 |
ASME B&PV |
Pressure Piping, non-hazardous |
__ |
≥ 15 |
ASME B31 |
Pressure/Vacuum Piping, hazardous* |
__ |
any |
ASME B31 |
Any Pressure System/Component Excluded
from ASME Codes with a RC > 1** |
__ |
≥ 0 |
Most applicable ASME or AWS |
Any Pressure System/Component Excluded
from ASME Codes with a RC ≤ 1** |
__ |
≥ 0 |
Not required |
Cat. 0 Vacuum Systems*** |
__ |
≤ 15 |
Not required |
Cat. 1 Vacuum Systems*** |
> 33 AND V > 35ft3 |
≤ 15 |
Not required |
Cat. 2 Vacuum Systems*** |
< 33 OR V < 35ft3 |
≤ 15 |
Not required |
Cat. 2 Vacuum Systems*** |
> 33 AND V > 35ft3 |
≤ 15 |
Most applicable ASME OR AWS |
Cat. 3 Vacuum Systems*** |
__ |
< 0, ≥ 15 |
Most applicable ASME |
Where:
A largest internal cross sectional area
P maximum allowable external or internal differential pressure
V volume of vacuum system
Notes:
* Generally true for most process piping excluding cryogenic, flammable, damaging and toxic fluids (RE must consult applicable piping code). The minimum or maximum pressure thresholds may be different for other piping applications according to their applicable code.
** Risk Code shall be determined by a Responsible Engineer
*** Refer to Pressure and Vacuum Systems Safety Supplement, Part 7: Vacuum Systems
Table 2 Structural and Material Handling Weld Classification
|
Load
Height Above Floor |
Weight
Supported by
Item/System |
Risk
Code |
CODE |
Load Bearing
Structures |
Any |
>100 Lbs |
RC>1 |
Yes |
>6 Ft |
Any |
RC>1 |
Yes |
|
Any |
Any |
RC>1 |
Yes |
|
Material Handling
Fixtures |
Any |
>100 Lbs |
Any |
Yes |
≥6 Ft |
Any |
Any |
Yes |
|
Any |
Any |
RC>1 |
Yes |
|
|
|
|
|
|
Building/Structures
for Human Occupancy |
Any |
Any |
Any |
Yes |
Note: These are general guidelines and a Task Hazard Analysis shall be performed for each case to verify the above classifications.
|
ISSUING AUTHORITY |
SUPPLEMENT AUTHOR |
APPROVAL DATE |
REVIEW DATE |
REV. |
|
|
QA/CI Dept. |
Welding Technical
Committee |
01/12/16 |
01/12/21 |
2.1 |