34-SAMSS-821

Materials Syste Syst em Specif pecific ica ati tion on 34-SAMSS-821

5 October 2005

Instrument Control Cabinets – Outdoor Instrumentation Standards Committee Members Al-Awami. L.H., L.H., Chairman Chairman Tuin, R.R., Vice Chairman Al-Dakhil, T.K. T.K. Al-Dhafeeri, F.T. Al-Khalifa, A.H. Al-Madhi, F.A. F.A. Alqaffas, S.A. S.A. Bogusz, Z.J. Ell, S.T. Fadley, G.L. Falkenberg, A.R. Gawargy, N.E. Grainger, J.F. Jumah, Y.A. Mahmood, B. Qarni, M.A. Trembley, R.J.

Saudi Saudi Aramco Aramc o Desk DeskTop Top Standards Standards Table of Contents

1 2 3 4 5 6 7

Scope............................. Scope.......................................... ........................... ................... ..... 2 Conflicts and Deviations.......................... Deviations................................. ....... 2 References............................. References................ .......................... ........................ ........... 2 General Requirements.............. Requirements........................... ..................... ........ 3 Design............................ Design......................................... .......................... ................... ...... 5 Nameplates.......................... Nameplates......................................... .......................... ........... 6 Piping.......................... Piping....................................... ........................... ...................... ........ 6

Previous Issue: 29 May May 2002 Next Planned Update: 1 November November 2010 Revised paragraphs are indicated in the right margin Primary contact: Saeed M. Al-Abeediah on 875-2559

Copyright©Saudi Aramco 2009. All rights reserved.

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Document Responsibility: Instrumentation Issue Date: 5 October 2005 Next Planned Update: 1 November 2010

1

34-SAMSS-821 Instrument Control Cabinets - Outdoor

Scope This specification defines the minimum requirements for instrument control panels and cabinets for location in outdoor areas. Excluded from this specification are control panels provided in packaged equipment and field instrument junction boxes.

2

3

Conflict s and Deviations 2.1

Any conflicts between this specification and other applicable Saudi Aramco Materials System Specifications (SAMSSs), Engineering Standards (SAESs), 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.

2.2

Direct all requests to deviate from this specification 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.

2.3

The designation "Commentary" is used to label a sub-paragraph that contains comments that are explanatory or advisory. These comments are not mandatory, except to the extent that they explain mandatory requirements contained in this SAMSS.

References Material or equipment supplied to this specification shall comply with the latest edition of the references listed below, unless otherwise noted. All of the requirements of 34-SAMSS-820, Instrument Control Cabinets - Indoors, shall be adhered to unless superseded by requirements of this specification, 34-SAMSS-821. 3.1

Saudi Aramco Documents Saudi Aramco Engineering Procedure SAEP-302

Instructions for Obtaining a Waiver of a Mandatory Saudi Aramco Engineering Requirement

Saudi Aramco Materials System Specification 34-SAMSS-611

Safety Relief Valves Conventional and Balanced Types

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34-SAMSS-820


Instrument Control Cabinets - Indoors

Saudi Aramco Inspection Requirement 175-343100

3.2

Instrument Control Panels

Industry Codes and Standards American National Standards Institute ANSI B1.20.1

Pipe Threads, General Purpose (Inch)

American Society for Testing and Materials ASTM A269

Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

International Electrotechnical Commission IEC 60529

Classification of Degrees of Protection Provided by Enclosures

National Electrical Manufacturers Association

4

NEMA 250

Enclosures for Electrical Equipment (1000 Volts Maximum)

NEMA ICS 6

Enclosures for Industrial Controls and Systems

General Requi rements 4.1

Environmental 4.1.1

Equipment Mounted Internal to the Outdoor Cabinet shall operate continuously under the following humidity conditions. Relative Humidity:

4.1.2

Minimum Maximum

5% 95% (non-condensing)

Portions of Equipment that are mounted externally on the Outdoor Cabinet shall operate continuously under the conditions sporadic water spray such as from rain. Temperature: Instruments and control systems shall operate continuously under the following ambient air temperatures without any degradation of the manufacturer's guaranteed performance: Page 3 of 9



Maximum Minimum


Outdoor Sheltered Notes: (1),(2),(3) 55°C (131°F) 0°C (32°F)

Outdoor Unsheltered Notes: (2),(3) 65°C (149°F) 0°C (32°F)

Notes:

4.2

1)

"Sheltered" refers to permanent, ventilated enclosures or buildings, or permanently fixed sunshades with a top and three sides.

2)

For semiconductors and any other instrumentation devices which dissipate internal heat, an additional 15°C shall be added to the above temperatures. An example, for "Outdoor Sheltered" installation, the equipment must perform at 55 + 15 = 70°C. Similarly, for the "outdoor unsheltered" case, the equipment shall be designed for a maximum operating temperature of 65 + 15 = 80°C.

3)

The designer can take credit for forced or passive cooling to eliminate or reduce the 15°C heat rise. For example, if vortex coolers are used, the heat removal capacity of the coolers may be subtracted from the generated heat. No more than 15°C reduction in temperature will be given as credit. The designer shall substantiate his claim by providing the support data and calculations.

Offshore and Nearshore Environment Equipment which is not enclosed or hermetically sealed, but is situated offshore or nearshore, shall be protected against corrosion and operational failure due to wind-borne sea water spray and the accumulation of wetted salt (NaCl). Nearshore is defined as any outdoor, onshore location within one kilometer from the shoreline of the Arabian Gulf; all of the Ras Tanura Refinery and Terminal; and within three kilometers from the shoreline of the Red Sea.

4.3

Ambient Air Quality Commentary Note: Air-borne dust concentrations and contaminant levels are used in mechanical equipment design, when sizing air filters and as a measure of potential dust ingress in bearing housings, lube oil systems, etc.

Dust Concentration: Usual airborne dust concentration is 1 mg/m³. During sandstorms, dust concentrations may reach 500 mg/m³. Particle sizes are as follows: 95% of all particles are less than 20 micrometers 50% of all particles are less than 1.5 micrometers Elements present in dust include compounds of calcium, silicon, magnesium, aluminum, potassium, chlorides and sodium. When wetted (high humidity conditions), these compounds function as electrolytes and c an result in severe corrosion.

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Other pollutants present in the atmosphere under the most extreme conditions are: H2S Hydrocarbon

5

20 ppm (vol/vol) 150 ppm (vol/vol)

SO2

10 ppm (vol/vol)

CO

100 ppm (vol/vol)

NOx

5 ppm (vol/vol)

O3

1 ppm (vol/vol)

Design 5.1

Enclosures Enclosures shall meet the requirements of this Section. 5.1.1

In outdoor plant areas, the panel/cabinet shall be NEMA 250/NEMA ICS 6 Type 4 or IEC 60529, Type IP65.

5.1.2

In outdoor plant and other industrial areas located in severe corrosive environments as defined in Paragraph 4.2, enclosures shall be NEMA Type 4X or IEC 60529 Type IP66, manufactured of 316L stainless steel. Galvanized and/or painted or coated carbon steel sheet metal enclosures are not permitted. Commentary Note: In outdoor plant and other industrial areas located in severe corrosive environments, Paragraph 5.1.2 supersedes Paragraphs 5.1.1.

5.2

Electrical 5.2.1

Area Classification The panel/cabinet and all components within the panel shall be suitable for the electrical area classification where the panel will be installed. The classification of the area in which the panel will be used, shall be specified in the Purchase Order.

5.2.2

Conduit Entry 5.2.2.1

The entry (on non-explosion proof cabinets) shall have a removable blank gland plate as specified in the Purchase Order for Buyer's conduit entry.

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5.2.2.2 5.2.3


Elevated outdoor control cabinets shall normally have conduit entry from the bottom.

Relays Relays shall be hermetically sealed.

5.2.4

Pushbuttons and Lights Pushbuttons, pilot lights and switches shall be heavy duty, oil-tight, and shall meet the area classification of the installed location.

5.2.5

Cabinet Lights and Convenience Outlets Cabinet Lights and Convenience Outlets shall be provided. At least one light and duplex outlet shall be provided for each cabinet.

5.2.6

Solenoid Valves Solenoid Valves shall be equipped with Viton Soft Goods.

6

Nameplates Nameplates shall be attached to the cabinets using stainless steel screws. The nameplate shall be made of corrosion resistant material. The lettering shall be clearly legible. Internal nameplates (within the cabinet) shall also be installed using stainless steel screws. Using adhesive nameplates is not acceptable.

7

Piping No process piping of any kind shall be allowed in a control cabinet. The only fluid allowed is instrument air. 7.1

Piping Installation 7.1.1

The pneumatic piping shall be installed so that each component, including future instruments to be installed in spare places, will be easily accessible for adjustment and calibration. Removal of instruments and components shall be possible without having to remove other instruments and components.

7.1.2

Pneumatic piping which does not have a pressure indication on the instruments it connects shall be provided with a plugged tee for testing.

7.1.3

All threaded connections shall be ANSI B1.20.1 tapered.

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7.1.4 7.2

7.3


All open fittings and bulkhead connections shall be plugged or capped during transportation.

Air Supply 7.2.1

Air headers shall be sized for the capacity of all instruments plus 20% spare for future additions.

7.2.2

The header material shall be stainless steel.

7.2.3

Stainless steel take-off nipples shall be provided at the top of the air header for connection of the instruments. Each take-off nipple shall have a ¼-inch isolating valve with a tag for connected instrument identification. The isolating valve shall be rated at 3000 psi, stainless steel construction, with ¼" female NPT connections. Packing type valves shall have stainless steel stems. 20% spare take-off stainless steel nipples with plugged isolating valves shall be installed for future requirements.

7.2.4

The air header shall be sloped 1 to 100 downstream and have a ½-inch drain valve with plug on the bottom at the lower end of the header. The end of the air header shall be capped with a 2-inch plugged valve. Vertical headers shall have a blowdown valve at the lower end.

7.2.5

A relief valve with lifting lever shall be installed to prevent overpressurizing the instruments. The set pressure shall be as specified in the Purchase Order. The relief valve shall be sized for the combined total capacity of two parallel air pressure regulators on 860 kPa air supply. The relief valve shall meet the requirements of Saudi Aramco Materials System Specification 34-SAMSS-611.

Air Filter Reducing Station 7.3.1

Common dual air filter-regulator facilities shall be provided, consisting of: •

Two (2) air filters with female NPT connections;

•

Two (2) air pressure regulators with female NPT connections;

•

•

Two (2) pressure gauges 0-200 kPa (0-30 psi) with ¼-inch NPT connection; One (1) pressure gauge 0-1000 kPa (0-150 psi) with ¼-inch NPT connection.

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Integral combinations of the above equipment are allowed provided the functionality of the system is maintained. (e.g., combination filter/regulator with downstream pressure guage).

7.4

7.3.2

Each filter and regulator shall have adequate capacity to serve the entire panel. It shall be suitable for an air-supply pressure between 400 and 860 kPa and a regulated header pressure of 170 kPa. The filter shall be of the metal bowl type.

7.3.3

The station shall be equipped with suitable valving and coupling for removal of each filter and regulator during normal operation without service interruption.

Tubing and Fittings 7.4.1

Tubing Stainless steel tubing shall be seamless, annealed, minimum wall thickness 1.24 mm, per ASTM A269, Grade TP-316L. Instrument air tubing shall be ¼ inch, 3/8 inch, or ½ inch OD stainless steel. Wall thickness shall be 0.75 mm or larger.

7.4.2

Tube fittings shall be 316 stainless steel and shall be compression type Crawford Fitting Swagelok, Parker Hannifin CPI or A-lok, Hoke Gyrolok or equivalent to the above as approved by Supervisor, Instrumentation Unit, Process Instrumentation Division, Process & Control Systems Department. Interchange of tube fitting component parts from different manufacturers is not allowed.

7.4.3

Incoming and outgoing pneumatic signal lines shall terminate in bulkhead fittings. Location and size(s) shall be as specified in the Purchase Order. The bulkhead fittings shall be identified by colored rings, blue for incoming and red for outgoing lines. Rings shall be provided internally and externally on the panel and be marked with the identification numbers and letters of the corresponding instruments, i.e., the internal ring shall carry the panel instrument tag number and the external ring shall carry the tag number of the field instrument.

7.4.4

Bulkhead fittings and 20% spares, as a minimum, shall be installed with adequate spacing to ensure that any connection can be removed without the need to remove other fittings.

7.4.5

Tubing runs and Bulkhead fitting layouts shall be included in the documentation provided to Saudi Aramco.

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5 October 2005


Revision Summary This revision is intended to address comments generated as part of the Instrumentation Standards Value Engineering conducted on March 5-9, 2005.

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34-SAMSS-821

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