saes-a-400

16
Previous Issue: 20 April 2010 Next Planned Update: 2 June 2014 Revised paragraphs are indicated in the right margin Page 1 of 16 Primary contact: Mehra, Yuv Raj on 966-3-8747953 Copyright©Saudi Aramco 2010. All rights reserved. Engineering Standard SAES-A-400 17 July 2010 Industrial Drainage Systems Document Responsibility: Industrial Drainage Standards Committee Saudi Aramco DeskTop Standards Table of Contents 1 Scope................................................................. 2 2 Conflicts and Deviations..................................... 3 3 References......................................................... 4 4 Definitions........................................................... 6 5 General Requirements....................................... 9 6 Drain Requirements for Specific Applications.. 12 7 Tank Dewatering.............................................. 14 8 Appendices....................................................... 14

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Page 1: SAES-A-400

Previous Issue: 20 April 2010 Next Planned Update: 2 June 2014 Revised paragraphs are indicated in the right margin Page 1 of 16 Primary contact: Mehra, Yuv Raj on 966-3-8747953

Copyright©Saudi Aramco 2010. All rights reserved.

Engineering Standard

SAES-A-400 17 July 2010

Industrial Drainage Systems

Document Responsibility: Industrial Drainage Standards Committee

Saudi Aramco DeskTop Standards Table of Contents  1 Scope................................................................. 2

2 Conflicts and Deviations..................................... 3

3 References......................................................... 4

4 Definitions........................................................... 6

5 General Requirements....................................... 9

6 Drain Requirements for Specific Applications.. 12

7 Tank Dewatering.............................................. 14

8 Appendices....................................................... 14

Page 2: SAES-A-400

Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 2 of 2

1 Scope

1.1 The purpose of this standard is to provide general guidelines for the selection of

a proper drainage system to ensure that all liquids can be drained safely with

minimum risk of fire or injury. Full conformance to this standard will ensure

that facility drainage systems are capable of handling draining during both

normal operations and during maintenance, and turnaround and inspections

(T&I). Specifically, this standard provides general guidelines for design and

safe handling of:

1.1.1 liquid hydrocarbons,

1.1.2 toxic liquids,

1.1.3 chemicals,

1.1.4 corrosive liquids,

1.1.5 aqueous materials, and

1.1.6 other liquid effluents

that are drained in Saudi Aramco’s onsite and offsite facilities, including but not

limited to transportation pipelines, tank farms and other types of hydrocarbons

processing or handling facilities.

1.2 This standard covers all types of industrial liquid drains including, but not

limited to, the following:

1.2.1 instrument bridles and sight glasses

1.2.2 thermal relief valves on liquid piping

1.2.3 pump and compressor casings

1.2.4 knockout drums

1.2.5 process vessels and separators

1.2.6 heat exchangers

1.2.7 filters

1.2.8 reactors

1.2.9 fractionation columns

1.2.10 scraper launchers / receivers

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 3 of 3

1.2.11 bulk plants loading, unloading and heel recovery

1.2.12 loading arms

1.2.13 low pressure and atmospheric product storage tanks

1.2.14 hydrocarbon storage tanks’ dewatering systems

1.2.15 sample points

1.2.16 low point drains from control valves and piping systems

1.3 This standard does not cover:

1.3.1 The environmental design aspects of treating collected liquids from

industrial drainage and oily water drainage systems (refer to SAES-A-103

and SAES-A-104).

1.3.2 The drain systems of laboratories or dedicated battery rooms

(SAES-P-103) governed by SAES-S-060.

1.3.3 The offshore platform drainage systems (SAES-A-403).

1.4 This standard does not cover liquid sulfur drainage from Sulfur Recovery Plants.

Any sulfur drainage from sulfur plants shall be recovered according to

SAES-A-402.

1.5 For retroactive applications of this standard to existing facilities, refer to

SAEP-125, Paragraph 3.1.

1.6 For conceptual understanding of relationships between oily water and closed

drain systems, refer to simplified schematics under Appendix I for Process

Areas and Appendix II for Tank Farms. THE SCHEMATICS NEITHER

SUPERSEDE THE REQUIREMENTS OF THIS STANDARD NOR DO

THEY DICTATE THE CONFIGURATION OF A CLOSED DRAIN SYSTEM

OR AN OILY WATER DRAINAGE SYSTEM.

2 Conflicts and Deviations

2.1 Any conflicts between this Standard and other applicable Saudi Aramco

Engineering Standards (SAESs), Saudi Aramco Materials System Specifications

(SAMSSs), Saudi Aramco Standard Drawings (SASDs), or industry standards,

codes, and forms shall be resolved in writing by the Company or Buyer

Representative through the Manager, Process & Control Systems Department of

Saudi Aramco, Dhahran.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 4 of 4

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

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

and forward such requests to the Manager, Process & Control Systems

Department of Saudi Aramco, Dhahran.

3 References

All referenced Specifications, Standards, Codes, Forms, Drawings, and similar material

shall be considered part of this Standard to the extent specified herein and shall be the

latest issue (including all revisions, addenda, and supplements) unless stated otherwise.

3.1 Saudi Aramco References

Saudi Aramco General Instructions

GI-0150.100 Hazardous Materials Communication (HAZCOM)

Program

GI-0430.001 Implementing the Saudi Aramco Hazardous Waste

Code

Saudi Aramco Engineering Procedure

SAEP-125 Preparation of Saudi Aramco Engineering

Standards

SAEP-302 Instruction for Obtaining a Waiver of a

Mandatory Saudi Aramco Engineering

Requirement

SAEP-327 Disposal of Wastewater from Cleaning, Flushing

and Dewatering Pipelines and Vessels

Saudi Aramco Engineering Standards

SAES-A-007 Hydrostatic Testing Fluids and Lay-Up

Procedures

SAES-A-103 Discharges to the Marine Environment

SAES-A-104 Wastewater Treatment, Reuse and Disposal

SAES-A-401 Closed Drain Systems

SAES-A-402 Chemicals Handling Systems (under development

refer to commentary note)

SAES-A-403 Offshore Platform Drainage Systems

SAES-B-005 Spacing and Diking for Atmospheric and Low-

Pressure Tanks

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 5 of 5

SAES-B-054 Access, Egress, and Materials Handling for Plant

Facilities

SAES-B-055 Plant Layout

SAES-B-068 Electrical Area Classification

SAES-B-070 Fire and Safety Requirements for Bulk Plants, Air

Fueling and Sulfur Loading Facilities

SAES-F-007 System Design Criteria for Flares

SAES-G-005 Centrifugal Pumps

SAES-J-003 Instrumentation - Basic Design Criteria

SAES-P-103 UPS and DC Systems

SAES-S-010 Sanitary Sewers

SAES-S-020 Oily Water Drainage Systems

SAES-S-030 Storm Water Drainage Systems

SAES-S-060 Saudi Aramco Plumbing Code

Commentary Note:

The newly proposed Industrial Drainage Standards Committee will develop the proposed standard SAES-A-402. Expected issuance date of this standard is in 2011. Until this standard is issued, any queries in regard to industrial drainage systems shall be forwarded to the following:

Manager, Process & Control Systems Department

Chairman, Industrial Drainage Standards Committee

Saudi Aramco Material Systems Specifications

16-SAMSS-503 Indoor Control Gear - Low Voltage

16-SAMSS-514 Control and Protective Relay Panel - Indoor

Saudi Aramco Engineering Reports

SAER-5437 Guidelines for Conducting HAZOP Studies

SAER-6168 Engineering Review Report for Oily Water Lift

Stations

3.2 Industry Codes and Standards

American Society for Testing and Materials

ASTM D97 Standard Test Method for Pour Point of

Petroleum Products

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 6 of 6

National Fire Protection Association

NFPA 704 Identification of the Hazards of Materials for

Emergency Response

3.3 Saudi Government Documents and Standards

The Saudi Government General Environmental Regulations, General

Environmental Regulations

3.4 Chemical Hazard Bulletins (CHB’S)

CHB# 14 Sodium Hydroxide (Caustic Soda)

CHB# 47 Benzene

CHB# 71 Phenol (Carbolic Acid)

CHB# 155 Hydrogen Sulfide (H2S)

CHB# 400 Sulfuric Acid

CHB# 518 STADIS 450 (Anti-Static Additive)

CHB# 666 Hot Pot – 922 (Corrosion Inhibitor)

4 Definitions

Chemical Hazard Bulletin (CHB): An internal company document (Available in both

English & Arabic) developed by Environmental Protection Department to provide

standardized one-page summary of a material’s hazard ratings that will specify health

hazard, fire & reactivity, handling, storage & disposal and first aid information for use

in the handling of hazardous materials. Use of CHBs shall be consistent with the

requirements contained within GI-0150.100, Hazardous Materials Communication

Program (HAZCOM) to ensure employees are knowledgeable of the hazards associated

with the specific chemicals.

Closed Drain System (CDS): A closed drain system is a piping collection system

connecting selected hydrocarbon drains and is provided with recovery or safe disposal of

collected liquids. A CDS is isolated from air or oxygen sources. (Refer to SAES-A-401).

Combustible Liquid: A liquid that has a flash point greater than 54°C (130°F).

Examples of such fluids are: diesel, transformer oils, C7+ feed stocks, bunker fuel, and

sulfur (refer to SAES-B-005).

Dewatering Effluent: Contaminated liquid water separated from a hydrocarbon

storage tank that requires further treatment to separate and recover contained

hydrocarbons away from water before water can be disposed off through a waste water

treatment system in accordance with SAES-A-104.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 7 of 7

Flammable Liquid: A liquid that has a flash point equal to or less than 54°C (130°F).

Examples of such fluids are: stabilized crude, gasoline, Jet A-1, Jet JP-4, Jet JP-8, C6 and

lighter feed and blending stocks, and methanol. For purposes of this standard, a

combustible liquid stored or processed at a temperature equal to or higher than 8°C (15°F)

below its flashpoint shall be considered to be a flammable liquid (refer to SAES-B-005).

Flash Point: The flash point of a flammable liquid is the lowest temperature at which it

can form an ignitable mixture in air. At this temperature the vapor may cease to burn

when the source of ignition is removed (refer to SAES-B-005).

Flushing Oil: A lighter (greater API gravity) hydrocarbon liquid that is completely

miscible and can be used to improve the fluidity of a high pour point hydrocarbon

liquid.

Health Hazard Materials: Any material or chemical for which there is statistically

significant evidence based on at least one study conducted in accordance with

established scientific principles that acute or chronic health effects may occur in

exposed employees (as defined in GI-0150.100).

High Health Hazard Materials: High Health Hazard Materials, as defined herein,

include:

(a) Materials with a Health Hazard rating of 3 or 4 per the Saudi Aramco Chemical

Hazards Bulletins (CHBs), or per NFPA 704. Examples of such materials include

but are not limited to:

sodium hydroxide (caustic soda) – CHB# 14

benzene – CHB# 47

phenol (carbolic acid) – CHB# 71

hydrogen sulfide (H2S) – CHB# 155

sulfuric acid – CHB# 400

STADIS 450 – (anti-static additive) – CHB# 518

hot pot -922 (corrosion inhibitor) – CHB# 666

(b) Highly corrosive materials such as acid, caustic and other materials injurious to

personnel.

Highly Corrosive Materials: For purposes of applying this Standard, aqueous

materials with a pH level 1-3 (acid) or pH level 12-14 (base) which, on brief exposure,

could cause major injury or destructive damage.

High-Pour Point Materials: Materials that have a pour point within 10°C (18°F) of the

ambient temperature.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 8 of 8

Influent Sump: A lift station installed at the inlet to an oily water separator.

Inventory: All liquid contained in the vessel including contents in the piping to the

nearest emergency shut down or block valve.

Lift Station: A facility to pump effluent from a sump to a point of higher elevation

(refer to SAES-S-020).

Neutralization: For pH control, the Government allowable discharge is between 6 and

9 standard pH units. Discharge liquids must meet Government and SAES-A-104

definition of pH quality.

Oily Water: Mixtures of hydrocarbon residues and water. Oily water is considered to

be contaminated water released during normal operation.

Note: Due to unforeseen conditions and during uncontrollable accidental situations such as during fire or spill-containment, the oily water drainage system may receive oil-contaminated wastewater with flammable hydrocarbons (refer to SAES-S-020).

Oily Water Drainage System (OWDS): A system that removes surface runoffs and

effluents from process areas within a plot limit to a treatment facility, or off-plot pond

area. It operates either by gravity or pumping force. The OWDS consists of catch

basins, manholes, and a network of drainage piping consisting of sub-laterals, laterals,

sub-mains and mains (refer to SAES-S-020 & SAER-6168).

Pour Point: Pour point of a liquid is the lowest temperature at which the liquid will

just flow under standards test conditions as defined by ASTM D97 [ASTM Standards

Test Method for Pour Point of Petroleum Oils (D97/IP 15)].

Pressurized Hydrocarbons: Pressurized hydrocarbons shall mean that the pressure in

the source equipment at the time of drainage is sufficient to overcome the hydraulic and

static system pressure drop to transfer liquid hydrocarbons to a CDS.

Process Areas: All physical areas of a facility that involve processing, handling and

treating of hydrocarbons including any sources of ignition. Typical outside process area

facilities include tank farms, pipelines, waste water ponds, etc.

Tank Dewatering System: A system to remove settled water from atmospheric

hydrocarbon storage tanks. (For flammable liquid tanks refer to SAES-A-401, and for

combustible liquid tanks refer to SAES-S-020.)

Toxic: Any material with health hazard 3 or 4 as defined by NFPA 704.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 9 of 9

5 General Requirements

Selection of the type of drainage system shall be based on the following design and

operating philosophy:

5.1 Combustible, flammable, high health hazard, toxic, corrosive, or high-pour point

liquid materials shall not be drained into the oily water drainage system

(OWDS) (SAES-S-020), storm water drainage system (SAES-S-030), or

sanitary sewer system (SAES-S-010) except as provided for under Section 6 of

this standard.

5.2 Any facility handling flammable and combustible liquid hydrocarbons, toxic or

high health hazard materials shall have a closed drain system (CDS) designed in

accordance with SAES-A-401. This requirement is applicable to new or

existing facilities. Existing facilities may use available systems to meet the

intent of CDS definition under Section 4.

5.3 All flammable and combustible liquid hydrocarbons, toxic and high health

hazard materials shall be drained to CDS.

5.4 No pressurized flammable and combustible liquid hydrocarbons and high health

hazard materials shall be drained to an OWDS.

After complete depressurization and draining of equipment inventory into CDS,

residual inventories of flammable and combustible liquids and high health

hazard materials less than 0.1 m3 (26 US gallons) from equipment may be

drained to the OWDS.

5.4.1 If draining to the OWDS, the sewer shall be flushed with water for

dilution after draining such flammable and combustible liquids and high

health hazard materials. Water flushing shall continue until percent lower

explosive limit (%LEL) determined by manual test, by lowering the

%LEL tester sample hose near the liquid level, is reduced to < 10%.

5.4.2 Draining flammable and combustible liquids and high health hazard

materials to OWDS under above guideline is subject to: (a) wind

direction, (b) positioning of any ignition source beyond 15m, (c) H2S

content less 10 ppm, and (d) use of proper safety personal protective

equipment (PPE) including breathing apparatus.

Operational Commentaries:

(1) Contact Environmental Compliance Division for recommendation of PPE, which will include skin, eye, and respiratory protection for the relevant chemical hazard.

Page 10: SAES-A-400

Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 10 of 10

(2) Foreman and/or Shift Superintendent responsible for the operation of oily wastewater treatment system shall be informed prior to the draining of these hydrocarbon liquids. This is required in order to prevent failure of the treatment system and the violation of environmental regulations.

5.5 For new facilities, OWDS shall be designed based on gravity drainage

configured with one influent sump at API Separator.

5.5.1 To minimize the depth required for influent sump, segregate the OWDS

from the storm/fire water system.

5.5.2 If high water table or large distances are an impediment to design of

influent sump even after segregation under 5.5.1, then one additional lift

station may be installed in between influent sump at API Separator and

the process area, but such lift station must be located outside the process

area.

Selection of proposed OWDS configuration shall be reviewed by Proponent,

Loss Prevention Department, Process & Control Systems Department,

Environmental Protection Department, and Consulting Services Department and

approved by Chairman of Industrial Drainage Standards Committee, this

approval shall be documented in Project Proposal of the project.

5.6 For existing facilities that have OWDS “with lift stations:”

5.6.1 Upgrade pumped lift stations to meet requirements of SAES-S-020.

5.6.2 For existing facilities that do not have CDS, initiate the installation of a

CDS in accordance with paragraph 5.2 and in the interim follow short

term recommendations under SAER-6168.

5.7 For T&I or equipment maintenance, the system shall be designed to drain and

depressurize equipment to CDS. Provision for N2 or fuel gas to transfer any

residual, low pressure flammable and combustible liquids and high health

hazard materials to CDS shall be provided, except for existing equipment where

design pressures do not allow pressurization by N2 or fuel gas. Depressurized

equipment drains (normally closed and blinded) may be opened to OWDS only

to confirm that all flammable and combustible liquids and high health hazard

materials have been completely drained.

Operational Commentary:

Since the CDS system is heavily utilized during plant/unit T&I, it is probably best to schedule the T&I of the CDS while the operating unit is in service. The Operations & Maintenance Manual shall provide for temporary arrangements and precautions for any emergency drainage through the OWDS while the CDS in undergoing its T&I.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 11 of 11

5.8 The design of OWDS shall be in accordance with SAES-S-020. The lift station

pump(s) requirements shall be in accordance with SAES-G-005 and designed to

safely operate under the requirements of SAES-B-068. In addition, a power

monitor shall be provided to trip lift station pumps on loss of flow. All motors on

lift station pumps shall include an under power trip function implemented in the

control gear protection relay, as per 16-SAMSS-503 and 16-SAMSS-514. The

under power feature shall be set and tested such that it will trip the pump only on

dry-run and no-flow conditions and shall not cause nuisance trips. The under

power trip is in “addition-to” other required low-flow trips on lift station pumps as

specified by SAES-S-020.

5.9 The drainage of chemical feed and additives systems, drainage of chemicals

such as spent caustic, acids, amines etc., and drain systems for corrosive

materials shall be provided with an appropriately designed acid/base sewer

disposal system in accordance with SAES-A-402.

5.10 High pour point materials, like asphalt, demex pitch, etc., shall be drained to a

dedicated concrete pit that is designed for high temperature service and shall

maintain the temperature of the drained material at least 10°C (18°F) above the

pour point.

5.10.1 Draining high pour point liquids in OWDS is prohibited since this could

cause plugging.

5.10.2 High-pour point materials that can be safely mixed with flushing oils or

diesel to improve fluidity shall be drained to CDS.

5.10.3 Accumulated liquids may be disposed by a vacuum truck.

5.11 No liquids drainage piping of any kind shall be directly connected into the gas

flare system.

5.12 All sour water separated from hydrocarbon processing equipment shall be

directed to sour water treatment facilities. Hydrocarbon contaminated water

shall be handled in accordance with SAES-A-401.

5.13 All equipment drain piping to an OWDS shall be isolated by double isolation

(e.g., one block and bleed valves with plug or blind flange).

Commentary:

To assure drain piping tightness and avoid potential piping dead leg, one block valve shall be installed at or close to equipment outlet nozzle or at drain piping take off and the second isolation shall be located near OWDS funnel. Blind or plug shall be installed downstream the second block valve.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 12 of 12

5.14 All liquid drain systems shall be designed and conformed to the formal Hazard

and Operability (HAZOP) methodology following the guidelines in HAZOP

Engineering Report SAER-5437.

5.15 Hot steam condensate shall be directed to the condensate recovery system.

Operational Commentaries:

1. In the event of any contamination of steam condensate with hydrocarbons, identify the source of contamination and isolate for correction.

2. If for any reason, hydrocarbon-contaminated hot steam condensate is directed to OWDS, then it must be cooled by dilution with utility or fire water before entering OWDS.

5.16 For the design of OWDS and CDS for an offshore facility refer to SAES-A-403.

5.17 The disposal of wastewater from cleaning, flushing and dewatering pipelines,

tanks, and vessels at onshore facilities shall be in accordance with SAEP-327.

Hydrostatic test waters shall be disposed off in accordance with the

requirements of SAEP-327 and SAES-A-103; and disposal plans must be

approved prior to the start of any hydrotest in accordance with SAES-A-007.

5.18 For continuous liquid drainage flow, the size of the drainage pipe shall not be

reduced in size in the direction of the flow.

6 Drain Requirements for Specific Applications

Drain system design for specific flammable and combustible liquids drain applications

shall be as follows:

Drain Points Flammable Liquids Combustible Liquids

6.1 Instrument Bridles and Sight

Glasses CDS

1 CDS1 (except as

provided under 5.4)

6.2 Thermal Relief Valves on

Liquid Piping

CDS or route to

storage or holding

vessel

OWDS or route to

storage or holding

vessel

6.3 Pump and Compressor Casings CDS CDS (except as

provided under 5.4)

6.4 Knockout Drums CDS CDS (except as

provided under 5.4)

6.5 Process Vessels and Separators CDS CDS (except as

provided under 5.4)

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 13 of 13

Drain Points Flammable Liquids Combustible Liquids

6.6 Heat Exchangers CDS CDS (except as

provided under 5.4)

6.7 Filters CDS CDS (except as

provided under 5.4)

6.8 Reactors CDS CDS (except as

provided under 5.4)

6.9 Scraper Launchers/Receivers CDS2

CDS2 (except as

provided under 5.4)

6.10 Bulk Plants Loading, Unloading

and Heel Recovery CDS

3 CDS3 (except as

provided under 5.4)

6.11 Ship Loading Arms CDS CDS (except as

provided under 5.4)

6.12 Hydrocarbon Storage Tanks’

Dewatering Systems

Refer to Section 7.1

of this standard

Refer to Section 7.2

of this standard

6.13 Sample Points Flush CDS CDS (except as

provided under 5.4)

6.14

Low Point Drains from Control

Valves, Custody Metering

Stations and Piping Systems

CDS1 CDS

1 (except as

provided under 5.4)

Notes:

1. Temporary drain connections as allowed by Section 6.2.5.5 of SAES-A-401 may be used.

2. Exception for Scraper Launchers/Receivers:

In remote locations, where neither an OWDS nor a CDS is either justified or desirable, a collection sump without a pump shall be provided. Approval to use a sump shall be obtained from the Chairman of Industrial Drainage Standards Committee. The design shall include but not be limited to the following:

a) A detailed drawing showing the arrangement for the Scraper Launchers/Receivers drainage system and the sump construction. The sump volume shall be properly sized to handle the maximum flow rate to meet the design drain basis of the scraper launchers/receiver.

b) Drain shall be hard piped to the sump and the hard-pipe drain network shall be sized for closed drainage system and not for gravity.

c) The pump out pipe shall be fitted with quick connector, dust cap and chain design to allow tankers to vacuum out the content of the sump for disposal in accordance with GI-0430.001.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

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d) The collection vessel shall be fitted with a 4-inch vent extending 3 meters above ground and at a location of minimum 15 meters away from any ignition source as per SAES-S-020.

e) The collection vessel shall have a level instrument with local siren alarm in accordance with SAES-J-003.

f) For collection of scraper/receiver drains, either a concrete sump or a vessel installed below grade in accordance with Section 6.8.4.2 and 6.8.4.3 of SAES-A-401 shall be used.

3. Refer to Section 6.1.3 of SAES-A-401.

7 Tank Dewatering

All hydrocarbon tanks that require dewatering shall be equipped for water drainage.

7.1 Dewatering effluent from flammable hydrocarbon storage tanks shall be in

accordance with SAES-A-401.

7.2 Dewatering effluent from combustible hydrocarbon storage tanks may be

drained to OWDS in accordance with SAES-S-020.

Commentary:

High pour point materials from storage tanks shall not be drained to OWDS. These streams shall be drained in accordance with paragraph 5.10.

8 Appendices

For conceptual understanding of relationships between OWDS and CDS, refer to

simplified schematics as follows:

Appendix I - Process Areas

Appendix II - Tank Farms

These schematics DO NOT SUPERSEDE requirements of this standard.

Revision Summary

2 June 2009 New Saudi Aramco Engineering Standard. 29 December 2009 Editorial revisions. 9 March 2010 Editorial changes for consistency with other referenced standards. 20 April 2010 Editorial revision to add the clarifying paragraph 5.18 to prevent reduction in size of a pipe

in the direction of flow for continuous liquids drainage. 17 July 2010 Editorial revision to add the definition of Chemical Hazard Bulletins and clarification for

scraper/receiver collection vessel design criteria.

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

Page 15 of 15

Appendix I – Simplified Schematic of Process Areas

(This schematic DOES NOT SUPERSEDE requirements of this standard.)

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Document Responsibility: Industrial Drainage Standards Committee SAES-A-400

Issue Date: 17 July 2010

Next Planned Update: 2 June 2014 Industrial Drainage Systems

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Appendix II – Simplified Schematic of Tank Farms

(This schematic DOES NOT SUPERSEDE requirements of this standard.)