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.

Appendix C – Requirements Flowcharts

Welding and Brazing Supplement Requirements Applicability


Responsible Engineer (RE) Requirements

 

ISSUING AUTHORITY

SUPPLEMENT AUTHOR

APPROVAL DATE

REVIEW DATE

REV.

 

 

QA/CI Dept.

Welding Technical Committee

01/12/16

01/12/21

2.1