This article is about Mechanical Equipment Skid for Zone or Division 2 Material Selection Criteria & Requirements of Electrical Power System Systems as per International Codes and standards for Commercial Buildings, Plants and Refinery Projects.
Mechanical Equipment Skid for Zone or Division 2 Material Selection Criteria
Review documents of Material Receiving for the General Mechanical Equipment Skid for Zone or Div 2.
Identification procedure reviewed and implemented for General Mechanical Equipment Skid for Zone or Div 2.
Material identification shall be implemented for all materials, parts and components, including partially fabricated assemblies. General Mechanical Equipment Skid for Zone or Div 2 shall be identified by using tags, stamps, color coding, stencils or labels. The location and method of identification shall not affect the function or quality of the material.
General Requirements
Documentation for traceability reviewed and implemented. General Mechanical Equipment Skid for Zone or Div 2 shall be traceable from the manufacturer and supplier through delivery, storage, fabrication, erection, installation, repair, modification and use.
Documented Control System shall be implemented for all Saudi Aramco supplied material and equipment.
Material Inspection
- QC Before Installation- General Mechanical Equipment Skid for Zone or Div. 2 shall conform to all applicable requirements, standards, and specifications prior to release to be used as part of work.
- Incoming General Mechanical Equipment Skid for Zone or Div 2 shall be visually inspected for damage / defects occurred during transportation.
- General Mechanical Equipment Skid for Zone or Div 2 shall be new and unused.
- General Mechanical Equipment Skid for Zone or Div 2 shall be in accordance with the Saudi Aramco-approved project-specific design drawings, diagrams, schedules, lists, databases, and associated design documents.
- Check that the Contractor or it’s Saudi Aramco approved third party inspector performed the quality activities at the supplier and sub-supplier locations as required by the inspection level assigned for the materials and equipment identified in SAER-1972 Inspection Requirements.
- General Mechanical Equipment Skids shall be grounded with an equipment bonding jumper sized as required by NEC 250.122.
[NFPA 70, NEC 250.112(k)]” - Ensure that the manufacturer’s name, trademark, or other descriptive marking by which the organization responsible for the product can be identified shall be placed. The marking shall be of sufficient durability to withstand the environment involved.
[NFPA 70, NEC 110.21]” - Fittings and boxes shall be provided with threaded bosses for connection to conduit or cable terminations and shall be dusttight.
[NFPA 70, NEC 502.10(A)(1)(4)]” - Conduit seals shall be provided for entering enclosures, pressurized enclosures, two or more explosion proof enclosures and division 1 boundary.
[NFPA 70, NEC 501.15(A)]” - Check that the meters, instrument transformers, resistors, rectifiers and thermionic tubes, shall be provided with enclosures identified for Class 1 Div. 1 locations. This includes explosionproof enclosures and purged and pressurized enclosures.
[NFPA 70, NEC 501.105(A)]” - Check to ensure that transformer windings, impedance coils, solenoids, and other windings that do not incorporate sliding or make-or-break contacts shall be provided with enclosures. General-purpose-type enclosures shall be permitted.
[NFPA 70, NEC 501.1053(B)(3)]” - Check that Switches, circuit breakers and fuses, including push button, relays and similar devices are provided with dustight enclosures.
[NFPA 70, NEC 503.115]” - Where provision must be made for limited flexibility, one or more of the following shall also be permitted:
(1) Flexible metal fittings
(2) Flexible metal conduit with listed fittings
(3) Liquidtight flexible metal conduit with listed fittings
(4) Liquidtight flexible nonmetallic conduit with listed fittings
(5) Flexible cord listed for extra-hard usage and provided with listed bushed fittings. A conductor for use as an equipment grounding conductor shall be included in the flexible cord
[NFPA 70, NEC 501.10(B)(2)]” - Low voltage jacketed cables shall comply with NEC or IEC 60502-1.
(1) NEC low voltage cables shall be rated 600 V, shall have a minimum temperature rating of 90°C dry/75°C wet, and shall conform to UL standards according to the particular type (e.g., UL 1277, including its vertical tray flame test, for type TC tray cables, etc.)
(2) IEC 60502-1 type cables shall be rated 600/1000 V, shall have a minimum rating of 85°C, and shall meet the flame test of IEC 60332-3.” - Check that compression (crimped) type connectors shall be used for splicing and terminating stranded conductors.
- Use of connectors or terminals other than compression type, except solder connectors, supplied as integral parts or components of manufactured equipment such as molded case circuit breakers, contactors, outlets, etc., is permitted.
- Check that insulated ring tongue, locking fork tongue, flanged fork tongue and pin type compression (crimped) terminals shall be used for control wiring.
- Wires at termination points shall be identified by the use of permanently imprinted or embossed wire markers of the heat-shrinkable or slip-on type.
International Standard and Codes for Mechanical Equipment Skid for Zone or Division 2
- Non-Hazardous Indoor Enclosures, Installation and Pre-Commissioning
- Boxes, Enclosures, and Accessories Materials Selection & Requirements
3. SAES-P-116 – Switchgear and Control Equipment, 1 March 2008
4. SAES-P-104 – Wiring Methods and Materials, 13 January 2008
5. NFPA 70 – National Electrical Code, NEC 2008 Edition
6. NETA ATS – Acceptance Testing Specification for Electrical Power Distribution Equipment and Systems, 2007