Easy. Safe. Simple. Access for Maintenance to Cooling Towers

Transcription

1 Easy. Safe. Simple. Access for Maintenance to Cooling Towers Paul Davies Representing Clint Lewis Representing

2 Introduction Types of Cooling Towers typically offered in the HVAC Industry Overview of Cooling Tower components requiring access for maintenance. Design obligations and standards surrounding hygiene, access and maintenance of Cooling Towers. Access options that meet requirements. Questions

3 Types of Mechanical Draft Cooling Towers (airflow) Forced Draft Equipment One or more fans are located at the air inlet to force air into the tower Induced Draft Equipment One or more fans are located in the air outlet to induce air flow through the air inlets

4 Types of Fluid Paths in Cooling Towers Crossflow - Air flows horizontally through the cooling tower and interfaces perpendicularly with the falling hot water Air Water Counterflow - Air enters at the base of the cooling tower, flows upward and interfaces counter-currently with the falling hot water Water Air

5 Induced Draft COUNTERFLOW Equipment Principle of OPERATION

6 Induced Draft CROSSFLOW Equipment Principle of OPERATION Dual Air Inlet Series 3000 Single Air Inlet Series 1500

7 Common Components requiring regular access for maintenance COLD WATER BASIN Crossflow and Counter Flow DRIVE SYSTEM Crossflow and Counter Flow BELT DRIVE SYSTEM

8 Common Components requiring regular access for maintenance BASIN SWEEPERS

9 Common Components requiring regular access for maintenance PVC FILL Crossflow and Counter Flow PVC ELIMINATORS Counterflow

10 Common Components requiring regular access for maintenance SPRAY SYSTEM Crossflow and Counter Flow AIR INLET LOUVRES Crossflow and Counter Flow

11 Design Obligations Australian Standard 3666 (Air-Handling & Water Systems of Buildings Microbial Control) Clause Access for maintenance: Easy and safe access for cleaning, inspection and maintenance shall be available to and about all plant, equipment and components covered in this Section. Clause Cooling towers: Cooling towers shall be fabricated from corrosion resistant materials, and shall be designed for ease of maintenance, particularly for cleaning of fill, water distribution system, basin and sumps.

12 Design Obligations Australian Standard - AS1657 Fixed platforms, walkways, stairways and ladders Design, construction and installation AS1657 is the Australian Standard that all designers, builders and suppliers of Access Solutions MUST design, select, construct and install to. The standard outlines all of the design clearances, tolerances and material types for compliant access solutions.

13 Design Obligations SAA HB Clause Access for maintenance: In Summary All cooling tower installations should allow for access to items such as, Water Distribution, Pipework Headers, Heat Exchange Fill Media etc. Cooling Tower installations should be provided with appropriate FIXED access ladders, internal/external walkways, handrails, toeguards and platforms all in accordance with AS1657.

14 Design Obligations Queensland Government Workplace Health and Safety Supplement No.2 to the PLANT ADVISORY STANDARD Clause 3 -Design and installation of cooling water systems Easy and safe access should be available to cooling water systems. The design of the system should facilitate regular maintenance and cleaning. Clause 5.3 -Who else has workplace health and safety obligations in relation to microbial control in cooling systems of buildings? Designers to ensure the plant is designed properly. Installers to ensure the plant is installed safe and without risk Employers To ensure health and safety is not affected by the way the person conducts the person s undertaking.

15 Access Considerations PIER HEIGHTS Piers allow for all pipework to be under the towers to allow freedom to move around the plant Piers also allow for a flooded suction to Condenser pumps

16 Access Considerations EXTENTS OF EXTERNAL WALKWAYS REQUIRED Low Level Basin Access Mid Level Fill and CIS Access High Level Water Distribution Access (Spray System)

17 Access Considerations EXTENTS OF INTERNAL WALKWAYS REQUIRED Low Level Basin Access High Level Drive access

18 Site Examples (180 Anne St)

19 Site Examples (Sunshine Coast Uni Hospital)

20 Site Examples (Canelands)

21 Site Examples (K1)

22 Site Examples (Orion Shopping Centre)

23 Presented by: Clint Lewis Applications Engineer, Baltimore Aircoil Australia Tel: +(61) Mob: Web: