| Standard Operating Procedure | SOP No. |
| --- | --- |
| Purge Gas Certification | 7.004 |

Effective: 03-06-12

DCR No.: 11001

Supersedes: 3-26-99

Revision No.: 5

Revision Date: 03-06-12

Page No.: 1 of 2

## 1

## Purpose

1.1 To establish a standard format for examination of purge gas to be used for the welding of stainless steel tubing.

## 2

## Scope

2.1 This procedure applies to all process gas lines when job/project specifications call for purge gas certification.

## 3

## Responsibility

3.1 The Therma Quality Control Examiner (QEC) shall perform the tasks listed herein.

## 4

## Procedures

4.1 Obtain a copy of the supplier’s packing slip and gas purity certificate.

4.2 Verify the packing slip and certification matches the dewar.

4.3 Verify the gas purity meets the minimum criteria for purity. The acceptance criteria are shown on Form FN 7.004.1 (Purge Gas Certification Log).

4.4 If the gas purity meets the previously referenced specifications, mark the dewar “Approved for Use”.

4.5 If the gas purity does not meet the previously referenced specifications, mark the dewar “Rejected”.

4.6 Log the results on Form FN 7.004.1 (Purge Gas Certifications Log).

4.7 Notify the foreman of the results.

## 5

## Review and Approval

5.1 No approval is necessary.

---

| Revision No. | SOP No. | Page |
| --- | --- | --- |
| 5 | 7.004 | 2 of 2 |

## Document Approval

Steve Engineering Mana

Rusconi

3/0 Date

12

Field / Operations Manager

3-6 Date

-12

Process Systems Manager

Date

原 t .

bangkok

Quality Assurance Manager

3-6 Date

-12