METHOD STATEMENTS

Date: 12.12.2009

Revision: 0

MS No: 37

AL FATEH UNIVERSITY PROJECT (FUP)CAMPUS - A

TRIPOLI, LIBYA

MATH. & STAT. FACULTY – C39/2009GENERAL & CHEMICAL STORAGES –C40/2009

METHOD STATEMENTS HVAC UNDERGROUND PIPING

SUMMARY:

The work covered by this Method Statement consists of providing all tools, labour, equipment, accessories, scaffolding and materials and performing all operations in connection with the pipe joining method and inspection of Hvac underground piping installation as detailed.

CONTENTS:

1. Introduction2. Materials and Tools

2.1-Materials2.2-Tools

3. Quality Control4. Application 4.1- Welding process 4.2- Joint Set installation method5. Cooling system external lines testing

1. INTRODUCTION

This method statement is written to appropriate Al Fateh University Project (FUP) Construction Specifications for Mathematics and Statistics Faculty and General and Chemical Storage Buildings.

This method statement includes all technical specifications of Hvac underground piping works in accordance with the requirements of Al Fateh University Project (FUP) standards.

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METHOD STATEMENTS

Date: 12.12.2009

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MS No: 37

2. MATERIALS AND TOOLS

2.1 Materials:

For the scope of this procedure, material is pre-insulated underground steel pipes as defined specs. The pipe material approved by Engineer shall be used.

1- Nimka underground preinsulated pipe shall be used cooling system external lines..2- Joints on pipes and fittings shall be welded. Fabricated fittings shall be used.

2.2 Tools:

Filler material (Poliol and isocyonate) Welding machine Metal Brush Flame gun

3. QUALITY CONTROL

Contractor’s Quality Control Engineer shall check the conditions of materials and components of each delivery, in particular to ensure that:

- Materials and components are clean, undamaged and dry.- Plants and tools are in a clean and serviceable condition at least every week.- Suitability of background provided for the roof isolation to be applied prior to first application.- Correct storage of materials at least every week is being checked regularly.- All packaged materials shall be delivered in factory-sealed, unopened, and unbroken bags,

packages, containers or bundles.- Bulk materials shall be delivered in clean transport vessels, free of contaminates.- All application shall be done in accordance with manufacturer’s requirements.

4. APPLICATION

4.1 Welding process

The pipe ends shall be beveled properly and cleaned foreign particulars . The pipes that will be joining together shall be welded according to previously submitted method of statement for welding.

4.2 Joint Set installation method

Step 1:

Suitable Joint set shall be provided for each diameter of pre-insulated pipes.That sets were delivered site for each required diameter.

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METHOD STATEMENTS

Date: 12.12.2009

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MS No: 37

Step 2:

Required equipment shall be provided. These are flame gun(torch),tools for surface abrasion, googles and etc.

Step 3:

Exposed steel and protective sleeve shall be cleaned and pre heated.

Step 4:

Protective sleeve shall be fixed over casing pipe. The hole thet on the sleeve shall be located upward.

Step 5:

Wrap the shrink sleeve around the casing pipe, ensuring the appropriate overlap.

Step 6:

The sleeve shall be fixed with band.

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METHOD STATEMENTS

Date: 12.12.2009

Revision: 0

MS No: 37

Step 7:

Using the appropriate flame gun, begin at the centre of the sleeve and heat around the pipe.

Step 8:

The polyurethane foam shall be used to insulate the pipe. Two different chemical shall be supplied in liquid form in jars. The amounts are given in the below table according to pipe diameter.

JOINT SETSpipe diameter POLYOL(white) ISOCYANATE(Red)

DN15 64 102DN20 93 149DN25 91 146DN32 114 182DN40 110 176DN50 130 208DN65 162 259DN80 202 323

DN100 311 498DN125 355 568DN150 410 656DN200 635 1016DN250 1044 1670DN300 1173 1877DN350 1497 2395DN400 1876 3002

5. COOLING SYSTEM EXTERNAL LINES TESTING

Cooling system operation pressure is 3 bar. Subject piping system to a hydrostatic test pressure, which at every point in the system is not less than 1.5 times the design pressure. The cooling system external line shall be tested 4.5-5 bars as per specification for duration of 2 hours. Any leakage shall be eliminated.

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