Method Statement For Copper Pipe

CONTENTS

1. SCOPE
2. PURPOSE
3. RESPONSIBILITES
4. SAFTY
5. PROCEDURES
6. COMMESIONING

1. SCOPE:

The scope of this method statement covers installation of the (Refrigerant Piping, Piping Fittings and Hock up between AHU and C.U (Air Handing Unit and Condensing Unit))

• PURPOSE:

The Purpose of this method statement is to describe the materials which will be used and work procedure.

• RESPONSIBILITES:

• HAC engineers are responsible for ensuring that this method statement is fully implemented upon approval by supervision consultant.
• HAC Quality Control Engineer is responsible for the proper implementation of the quality control procedures including inspection and testing of materials.

• PROCEDURES:

• Refrigeration Pipe work

The refrigeration pipes will be supplied according to approved Material.

 All pipe work must be suitable for R410a as applicable furthermore all of the following points should be adhered to.

• All copper pipes up to 1 5/8 ” outside diameter (O/D) shall be fabricated from refrigerant quality tube to the project specification. Tube shall be fully annealed (soft) up to 7/8″ ( 22 mm ) outside diameter (O/D) only. Tube shall be delivered to site internally degreased and shall be stored in clean dry conditions with ends sealed until required for installation. Outdoor support for pipes shall be covered tray

• All due consideration and allowances shall be taken to keep pipe work clean and dry during the installation works.

• Flared joints must only be used when connecting to equipment if required .

• Pipe work to properly fixed and supported using a recognized and approved hanger support by the engineer.

•  Brazing shall be carried out in accordance with Refrigeration Association Specification for Brazing. At all times, when brazing, a small amount of dry nitrogen must be purged through the pipe to prevent oxidation and scaling internally. Any component susceptible to heat during the brazing process that may be damaged must be protected.

All Completed R410 a system will be strength and leak tested with dry. If the system is found to be leaking free. The final pressure reading for both strength leaks testing is to be witnessed and entered into the supplier checklist.

3. Steps strength and leak test:

1. 3 bar (N2) for 3 min or more ( for contractor checking before submit to consultant )
2. 15 bar (N2) for 3 min or more ( for contractor checking before submit to consultant )
3. 40 bar (N2) for approximate 24 hours ( for inspection from consultant side )

• On completion of strength /leak testing an evacuation is to be carried out for more than 2hr and bring the system to (- 30mmHg) and the system will remain under this condition for more than 15 minutes.

• Mock up inspection request will be submitted for approval to proceed for all units as follow: –
• For copper pipe installation.
• Strength and leak tested for copper pipe at 40 bar (N2) for approximate 24 hours .
• For copper pipe insulation.

• Thermal insulation

Thermal insulating material used within any building shall be classified as noncombustible also free from substances which in the event of a fire would generate appreciable quantities of smoke or toxic fumes. Insulating materials shall be as defined by the building regulations and as per approved material submittals.

• Thermal insulating will be fitted to all the pipe work installations detailed herein all materials used will be ‘non-combustible’. All insulation materials adhesives and finishes will be suitable in all respects for continuous use without degradation throughout the range of operating temperatures and within the environment indicated.