Download SAES-A-007 PDF

TitleSAES-A-007
TagsCorrosion Pipe (Fluid Conveyance) Water Pipeline Transport Oxygen
File Size429.4 KB
Total Pages19
Document Text Contents
Page 1

Previous Issue: 3 July 2007 Next Planned Update: 27 September 2016

Page 1 of 19

Primary contact: Mansour Al-Zamil Tems on 966-3-880-9574



Copyright©Saudi Aramco 2011. All rights reserved.



Engineering Standard
SAES-A-007 27 September 2011

Hydrostatic Testing Fluids and Lay-Up Procedures

Document Responsibility: Materials and Corrosion Control Standards Committee















Saudi Aramco DeskTop Standards

Table of Contents

1 Scope............................................................. 2

2 Conflicts and Deviations................................ 2

3 References..................................................... 3

4 General Requirements................................... 3

5 Carbon Steel and
Low Alloy Steel Equipment.................... 5

6 Stainless Steel Equipment........................... 12

7 Special Requirements.................................. 13

8 Hydrostatic Test Water Preparation............. 16

9 Disposal........................................................ 16

10 Safety........................................................... 16

Appendix 1 – Approved Oxygen Scavengers…... 18

Appendix 2 – Dew Point of Natural Gases........... 19

Page 2

Document Responsibility: Materials and Corrosion Control Standards Committee SAES-A-007

Issue Date: 27 September 2011

Next Planned Update: 27 September 2016 Hydrostatic Testing Fluids and Lay-Up Procedures





Page 2 of 19



1 Scope

1.1 This standard establishes requirements to control corrosion and microbiological

damage during and after hydrotesting of new, revalidated, and refurbished

equipment when equipment is hydrotested in accordance with SAES-A-004,

SAES-L-150 or as required by other standards that specifically reference

SAES-A-007.

1.2 Equipment covered by this standard includes, but is not limited to, storage tanks,

pressure containing equipment, plant piping, and pipelines both onshore and

offshore.

1.3 The procedures in this standard are designed to prevent corrosion due to oxygen

(air) ingress and to prevent microbially induced corrosion. Hydrotest

procedures and lay-up procedures shall prevent oxygen ingress except as

specifically allowed in this standard.

1.4 Non-toxic liquids other than water may be used for pressure testing if the

operating fluid or the equipment can be adversely affected by water or by

freezing conditions. Water/methanol or water/glycol mixtures may be required

in locations where freezing is a concern. Contact the Supervisor, Corrosion

Technology Unit, Materials Engineering and Corrosion Control Division,

Consulting Services Department (CTU/ME&CCD/CSD), for the selection and

treatment of the appropriate fluid. Such a fluid shall not have a flash point

below 54°C (129°F).

1.5 Special requirements for specific systems are presented in Section 7 of this

Standard. If there is an apparent conflict between Section 7 and the general

requirements in the remainder of the Standard, Section 7 shall govern.

2 Conflicts and Deviations

2.1 Any conflicts between this standard and other applicable Saudi Aramco

Engineering Standards (SAESs), Materials System Specifications (SAMSSs),

Standard Drawings (SASDs), or industry standards, codes, and forms shall be

resolved in writing by the Company or Buyer's Representative through the

Manager, Consulting Services Department of Saudi Aramco, Dhahran.

2.2 Direct all requests to deviate from this standard in writing to the Company or

Buyer's Representative, who shall follow internal company procedure SAEP-302

and forward such requests to the Manager, Consulting Services Department of

Saudi Aramco.

http://standards/docs/Saes/PDF/SAES-A-004.pdf
../PDF/SAES-L-150.pdf
../PDF/SAES-L-150.pdf
http://standards/docs/Saep/PDF/SAEP-302.pdf

Page 10

Document Responsibility: Materials and Corrosion Control Standards Committee SAES-A-007

Issue Date: 27 September 2011

Next Planned Update: 27 September 2016 Hydrostatic Testing Fluids and Lay-Up Procedures





Page 10 of 19

For pipelines, dew point readings must be done at the

beginning, end, and all mainline valve locations.

Record the dew point temperature readings at each test

location. Record the pressure of the line or system at the time

of the dew point measurement. Record the pressure at which

the dew point measurement is made if different to the actual

system or line pressure.

If the dew point temperature is derived at a different pressure

to the lay-up pressure, use Appendix 2 or equivalent

conversion charts to yield the dew point at lay-up pressure.

Safety Note:

See Paragraph 10.5.1 on separation of air and gas mixtures.
See Paragraph 10.5.2 on safety issues concerning nitrogen.

5.2.3.7 When the required dew point is reached, pressurize the system

with nitrogen or sweet gas to the final lay-up pressure. Dry air

may be used only if it has been pre-approved. The system shall

be maintained at a positive pressure of at least 30 psig unless

this exceeds the design pressure of the system. Pressures up to

the normal operating pressure have been used for lay-up for

some systems. The dew point at the final lay-up pressure must

be lower than -1°C.

5.2.3.8 Shut in the system, maintain and monitor the pressure per

5.2.2.4 during the lay-up period.

5.2.3.9 For pipelines, re-measure the dew point at all original test

locations one week after reaching final lay-up pressure. If any

dew point reading is found to be higher than -1ºC at the lay-up

pressure, then the entire line must be dried again or an

alternative preservation method must be implemented.

5.2.4 Inert Gas Lay-up

5.2.4.1 Displace the hydrostatic test water by positive pressure with

nitrogen or sweet gas until no water drains out of the system.

Shut in the system under positive pressure until commissioning

and start-up. Ensure that systems being drained have vacuum

relief valves and pressure relief valves as necessary to protect

the system.

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