RFQ 330/2020

PROVISION OF BOILER CLEANING SERVICES AT MUNYATI POWER STATION

 

Zimbabwe Power Company invites your company to make a firm offer for the supply and delivery of the following items at Munyati Power Station.

 

PRICE SCHEDULE TO BE COMPLETED BY ALL BIDDERS WITHOUT FAILURE

 

Item

Description

Quantity

Total Price

1

Provision of Boiler Cleaning scope of work as follows:

ECONOMISER CLEANING

  • Clean all compartments of the economizer, by water washing and use of flat iron bars (or any other appropriate means) to poke between economizer tube fins to remove accumulated soot, ash and grit.
  • Thorough final water washing of the tubes and fins after completion of poking.
  • Removal of ash, soot, clinker and subsequent cleaning of all grit hoppers.
  • Cleaning out any such particulate matter accumulated in any part if the economizer enclosure

SUPERHEATER COMPARTMENTS

  • Removal of soot, clinker and ash from all superheater compartments
  • External cleaning of all superheater tubes to remove external scaling by mechanical or any other acceptable methods

DEAD SPACE

  • Removal of ash, soot, dust and grit from the dead space between the super and the combustion chambers

 

 

 

COMBUSTION CHAMBER (FURNACE)

  • Erection of scaffolding in the combustion chamber for purposes of cleaning all over head heat exchange surfaces.
  • Removal of soot and clinker from the rear, front, side walls and roof of the combustion chamber.
  • Cleaning of all generating tubes and any other heat exchange media in the combustion chamber. Water washing and de-scaling of the heat exchange surfaces of the boiler in the combustion chamber.
  • Removal of all rubble and dust so cleaned from the furnace by means of running the grate after removal of scaffolding.

UNDERGRATE COMPARTMENT

  • Removal of all ash, soot, clinker, dust and rubble from underneath the grate and disposing it through the bottom ash hopper.

ASH & GRIT HOPPERS

  • Removal of all ash, clinker, dust and rubble from the interior of the ash hopper. Removal of any foreign material that may cause hopper blockages. These are emptied through the ash paddle and run off as waste on the ash conveyor belts.
  • Clean all interior surfaces of the grit hoppers running the waste into the dump truck/cocopans which will then be driven and emptied at the dump site just outside the ash basement.

ASH PADDLE

  • Clearing of any ash, soot, clinkers, dust and rubble from the ash paddle, running it off the conveyor belt to the dump site.

AIR HEATERS

  • Removal and rigging down of air heater elements from the air heater compartment by means of a pneumatic winch provided or any other approved means provided by the contractor.
  • Ferrying of the removed elements to the watering point outside the Boiler House.
  • Water washing of the air heater elements.
  • Ferrying back the cleaned elements to the Boiler and subsequent rigging and fitting back into the respective air heater compartment.

BOILER EXTERNAL DUSTING

  • To carry out dusting of external surfaces of the whole boiler after completion of the cleaning outage, at a time when such dusting does not inconvenience operating personnel due to excessive emission.
  • The areas to be covered by such dusting covers the whole boiler enclosure, walkways, pipework and platforms on and around the boiler.

HOUSEKEEPING AND SITE CLEARANCE

  • Carry out the necessary housekeeping in and around the Boiler after completion of all works.

2

 

 

Posted:8 October 2020
Site Visit Date: 12 October 2020
Closing date:15 October 2020
Station:Munyati

If you are interested in this tender, please visit the ZPC offices to collect the tender documents. A fee of $10 applies.

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