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NECSA Current Tenders

Necsa Group (Necsa, NTP & Pelchem) subscribes to the Public Finance Management Act 29 of 1999 Chapter 9 paragraph 76 (4) (c) (PFMA), and National Treasury Regulations and all other applicable legislation. Necsa Group, therefore, is obliged to implement and maintain a procurement and provisioning system which is fair, equitable, transparent, competitive and cost-effective. Subsidiary companies are obligated to adhere to all policies and procedures of Necsa including the above.

Current Tender Closes on 10 May 2024.

Tender closes on 10 May 2024.

Doc. No.: NLM-URT-21/007

1.0 INTRODUCTION

The jaw crusher is required to reduce waste size of the cooled solid waste slag(s) of the low level nuclear waste, to smaller size particles, and then drum it so that it can comply with the acceptance criteria of the waste storage facility.

The user requirements specification (URS) will form part of the tender bid  documents during procurement stage. The crusher is required to have an enclosure, which will keep all the dust and contamination during the crushing process within the enclosure. The dust control extraction system will be venting dust at a maximum velocity of 4 m/s. The crusher enclosure and dust control extraction system does not form part of this URS, however it will have a separate URS.

2.0 PURPOSE

The purpose of this user requirement specification is to provide details of the requirements for the design, manufacture and supply of a fully functional Jaw Crusher, along with all its accessories (see section 9.0). This equipment is required for crushing radioactive nuclear waste solid slag to 60mm particle size.

SCOPE

The scope of supply is to:

  1. Supply a jaw crusher design and auxiliaries (specified in Section 9),
  2. Design the jaw crusher
  3. Review the crusher design & have it acceptances by Necsa
  4. Develop a quality control plan for jaw crusher
  5. Procure materials for a jaw crusher
  6. Fabricate, manufacturing and assembly the jaw crusher
  7. Perform Non-destructive examination on applicable components of the jaw crusher
  8. Perform factory acceptance test (FAT)
  9. Deliver the jaw crusher to the Necsa site
  10. Install the crusher and perform a site acceptance
  11. Pre-commission, and commissioning the jaw
  12. Sign-off all installation and commissioning
  13. Train the operators on how to operate the jaw
  14. A operating manual

Maintenance plan, commissioning and operating procedure , critical spares list and drawings i.e.   assembly drawings; electrical drawing; instrumentation drawings; control systems drawings (hard copies & soft copies) form part of this scope of work for the project, and shall be supplied with the jaw crusher.

The above mentioned  requirements in this document should satisfy and meet all the client’s (Necsa) requirements including the jaw crusher ISO quality standard(s).

STANDARDS

  • Jaw crusher shall be built in accordance with the latest ISO 9001
  • Adhere to Occupational Health and Safety Act 85, of 1993
  • BS EN 13383-1: 2013 - Air-cooled blast-furnace slag armour
  • The jaw crusher and related items must be designed to sound engineering and scientific practices and appropriate technical standards to ensure intended function and performance.
  • Safety, human factors, maintenance, operating and other interfaces shall be considered while designing the jaw

5.1     REFERENCES

  • EN 932-3, Tests for general properties of aggregates — Part 3: Procedure and terminology for simplified petrographic description
  • EN 1097-1:2011, Tests for mechanical and physical properties of aggregates — Part1:Determinationoftheresistancetowear(micro-Deval)
  • EN 1367-2:2009, Tests for thermal and weathering properties of aggregates — Part2:Magnesiumsulfatetest
  • EN 1744-1:2009+A1:2012, Tests for chemical properties of aggregates — Part 1: Chemical analysis
  • EN 1744-3, Tests for chemical properties of aggregates — Part 3: Preparation of eluates by leaching of aggregates
  • EN 1926:2006, Natural stone test methods — Determinationofuniaxialcompressive strength
  • EN 13383-2:2013, Armour stone — Part 2: Test methods EN 16236, Evaluation of conformity of aggregates — Initial Type Testing and Factory Production Control

GENERAL REQUIREMENTS

6.1 SAFETY PRINCIPLES

  • Safety hazard pertaining to equipment

All safety symbols shall be posted on the equipment and contained in the manuals. All safety symbols, labels, and instructions must be visible at all times.

  • Safety instructions and safety labels attached to the equipment shall be complete and legible.
  • Safety instructions and safety labels shall be kept
  • Any illegible or missing safety instructions and safety labels shall be replaceable before operating the equipment.
  • Symbols for prohibited actions

Prohibited actions used on equipment shall be indicated by a red circle with a red  diagonal line across the circle. The following action shall be indicated as prohibited on the crusher where applicable.

  • No climbing
  • No smoking
  • Do not touch
  • No open flames
  • Limited or restricted access
  • Do not use hands for testing hydraulic leaks, and.
  • All other non-stated but applicable prohibited actions
  • All required PPE shall be displayed
  • Blockage and malfunction

In the event of material blockage, any malfunction or operational difficulty, it should be made possible to stop equipment and lockout immediately (i.e. emergency stop). Rectify problem immediately, and carry on with the crushing activities.

OPERATION OF THE CRUSHER

7.1.1  Minimum safety requirements

All required personal protective equipment requirements, instructions and signs shall be posted and be clearly visible on the crusher as follows:

    • Operating the crusher generates Breathing or inhaling silica dust particles will cause death or serious injury.
    • All necessary precautions shall be taken to reduce the risk of breathing dust or
    • Working on or in close proximity to the crusher whilst it is operational  could cause serious injury or
    • All safety guards shall be installed and in correct working order before operating the crusher. Failure to do so could cause serious injury or
    • Prior to operation, all safety devices, control devices, decals and guards, temporarily removed for set-up, maintenance or repair purposes shall be refitted and checked immediately upon completion of the maintenance or repair work.
    • To avoid serious personal injury or death, the crusher shall never be operated without the the equipment safety devices, decal or guards removed or unsecured.The crusher shall not be started for any operational activity until the operators have read and fully understood the operating manual,including the safety section of the
      manual.
      • This crusher shall be electrically isolated prior to

      7.2 METHODS AND MODES OF OPERATION

      • The crusher start-up shall have an automatic mode which should normally be used.

      The manual crusher start up mode may be used if desired but components of the machine shall be started and stopped in the correct sequence.

      • The machine controls shall only allow the correct sequence by highlighting the next step when available.
      • The crusher shall comprise of an interlock such that no operator can  start it with material while loaded on
      • All material shall be cleared first before starting the
      • REMOVAL OF SAFETY DEVICES , GUARDS , AND DECALS

TROUBLE SHOOTING

The flooring around the jaw crusher should be checkered plate 6,5mm material thickness, suitable for a safe working area around the crusher,and there will be enough room to create a suitable safe work area for maintenance on the crusher.

  • Mentis design hand railing will be secured with bolts around the perimeter of the upper flooring to create a safe working
  • Access ladder shall be bolted to the frame work and built to
  • Supplier to specify all crusher components including quantity, and materials  of

CONVEYER:

  • 400mm wide
  • Conveyor belt to feed within a containment area of 5m X 5m X
  • Conveyor belt to have a feed chute fitted with skirts at the bottom at the tail end
  • Conveyor belt to have discharge chute fitted with skirts at the head end, discharging into the crusher.
  • Safety stop and trip wires, with siren included as part of equipment
  • Conveyor belt motor shall be supplied with a variable speed drive.
  • Manual feed with slag
  • Maximum height of the feed chute shall be 2m

MAIN INLET AND DISCHARGE HOPPER AS WELL AS DRUM TROLLEY

  • Main inlet hopper sha ll be fabricated in such a way as to minimize dust from the tipping drum, when it is being
  • The inlet hopper shall allow for direct dust extraction at the main inlet
  • The discharge hopper shall be made flexible to allow the inlet for receiving
  • A wheeled trolley shall be specifically  fabricated and supplied for travel in a straight line, to prevent the trolley from falling over when The trolley’s main purposed will be to move material in and out the crusher room.
  • The trolley shall be designed to handle up to 1650kg in mass.
  • The drum trolley shall receive crushed material at a height of 1,5m

10.0 CERTIFICATE

  • Certificate of conformity shall be supplied by the supplier
  • Mechanical completion certificate shall be supplied by the supplier on completion of site installation, electrical connection and crusher energizing, pre-commissioning and commissioning of the crusher.
    •  

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