Method Statement for Cable Laying

PROJECT / CONTRACT

Construction of Permanent Backwash System for

PWWT unit Multimedia filters

CONTRACT NO RL/TC/T/15/13A Dated 23 Feb 2014

DOCUMENT TITLE:

METHOD STATEMENT FOR

CABLE INSTALLATION, TERMINATION AND TESTING

05 March 2014

0 ISSUED FOR REVIEW AND APPROVAL PDD PDD PKP

DATE REV. _NO. REASON FOR REVISION PREPA

RED CHECKED APPD.

APPD. Q.CHEM DOCUMENT NUMBER: 4472-1009 REV 0 SHEET. 1 OF 14 REV. 0

DANEM ENGINEERING WORKS

INDEX 1. PURPOSE 2. SCOPE 3. ABBREVIATIONS 4. REFERENCE DOCUMENTS

5. EQUIPMENTS / VEHICLES /TOOLS 6. RESPONSIBILITIES

7. PROCEDURE

8. HEALTH, SAFETY AND ENVIRONMENT 9. JOB SAFETY ANALYSIS (JSA)

1. PURPOSE

The intention of this document is to describe the methodology we are adopting during the execution of the scope. Further to ensure the execution will be done in controlled and safe manner as per project scope complying with RLOC Specifications, Standards and procedures.

2. SCOPE

To install and terminate power, instrumentation and earthing cables for the Permanent Backwash system for PWWT unit Multimedia filters.

3. Abbreviations

1) IFC: Issued For Construction

2) JSA: Job Safety Analysis

3) PPE: Personal Protective Equipment

4) PTW: Permit To Work

5) QCS: Qatar Construction Standards

6) Q-Chem: Qatar Chemical Company Ltd.

7) QA/QC: Quality Assurance /Quality Control

8) RFI: Request For Inspection

9) MSDS: Material Safety Data Sheets

4. REFERENCE DOCUMENTS

1) Scope of Work TE-PRJ-SOW-31-0012 2) Annexure 4 Rev1 for TE-PRJ-SOW-31-0012

1) Hydraulic jack / cable jack 2) Rollers

3) Compactor 4) Shovel 5) Trucks

6) Cable Reel Stand 7) Puller Machine 8) End Tying Basket 9) Megger (0 – 5 KV) 10)Continuity Tester

6. RESPONSIBILITIES

1) Construction Manager and Project Engineer will be responsible

for all the activities.

2) Surveyor will be responsible for the setting out as well as the elevations.

3) Safety Officers and Site Supervisors will be responsible for all the related activities and the personnel working at site.

7. Procedure:

1. General

a. Cable Installation shall comply with reference codes and

design documents

b. All cable drums shall be checked with packing lists and

confirmation of mechanical damage will be done

c. During cable drum shifting ;check mechanical damage

,nameplate with cable schedule and drum list and phase rotation of the cable

d. Assure necessary PPE ,tools and equipment for cable pulling. Check the latest cable drum list and cable schedule. Check if all cable supports are installed and fixed.

e. All wires and cables shall be megaohm meter tested

f. Cables to be buried or used externally will be steel wire

armoured.

g. Cables will be directly buries, laid in concrete trenches,

fastened to cable trays rack, or in underground ducts

h. Check for the following

i. Proper type, size, color and number of the wires and cables are being installed

ii. For long pulls the pull is performed as per required pulling tension

iii. Cable is not pulled around too many bends and the radius is not too tight.

iv. Ambient temperature is as per required by cable manufacturer

v. Proper pulling compound is used

vi. Wires/Cables are protected from mechanical damage during pulling

vii. Cable fill is as per the required standards

viii. Minimum curve radius for cables ,where D is the overall diameter of the cable ,shall be 6D for unarmoured cable and 8D for armoured cable. ix. Junctions/slices where not removable ,shall be

made using sleeves ,crimped or welded ,restoring the integrity of the line by appropriate heat shrinkable sleeves .Cable splicing shall be

prohibhited except in the case of cable length exceeding the supplied lengths

2) Cable Pulling works

a. Direct buried cables shall be taken to ensure that the laying

area is not subject to landslide or cracking ,that there are no obstacles in the subsoil and there is no soil contamination

b. The bottom of the trench shall be backfilled with a layer of fine

sand as per the drawings.The fill material shall be tamped and any hard material which could damage the cable will be removed.

c. Install cables on layer of the cleaned and tamped

sand.Ensure excessive force and twisting of cables is avoided

d. Cables shall be cut from the drums as per the actual cable

length in accordance to the drum schedule and drum allocation sheets

e. Cable drums shall be rotated in direction of the arrow

f. Check Drum jacks provided are suitable for the cable drum

loads

g. Proper spacing will be maintained between the cables

h. Protection shall be provided to the cables at crossings with

pipes, civil works to prevent mechanical damage

i. Both ends fo the cable to be firmly sealed with tape to prevent

entry of water

j. Intermediate cable markers to be firmly attached to the cables

k. Control cables will be laid along the LV cables.HV cables to

be laid in separate trays

m. All cables will be secured to the trays by nylon fasteners

n. Cables leaving the trays will be properly protected by

pipes/channels

o. All buried cables to be secured by covering with sand,

tiles,warning tapes at specified depths

3) Marking of Cables

a. All cables will be marked as per cable schedule

b. Buried cables will be tagged with corrosion resistant tags

c. Cable marking shall be positioned properly to read and

identify

4) Cable Termination and Connection work

a. High voltage cable termination work will be done by certified

cable terminator.

b. The cable to be checked as per the Check List A before cable

termination work.

c. Cable bends in the terminal boxes shall be big as possible.

d. If cable glands are used cables will be checked as per Check

List B before the work starts.

e. Cable core markers to be firmly attached.

f. Before termination, insulation resistance check will be done.

Interphase continuity check will also be done

g. Pressure and compression terminals to be used ,shall be of

correct size for the cable.

h. Terminals shall be connected.

i. Cable arrangement after the termination shall be neat and

tidy.

j. After completion of termination, insulation resistance check

5) Testing and Records

a. Insulation resistance test will be carried out by approved

calibrated equipment.

b. Testing will be witnessed by QA/QC person

c. DC high voltage test will be conducted after confirming the

cables are properly laid as per schedule and specifications

Voltage Class Test instrument Acceptance Value

M/V Cable 5000 VDC >100 Megaohm

L/V Cable 1000 VDC >20 Megaohm

Control,Instrumentation,Commu nication cable

250 VDC >1 Megaohm

8. HEALTH, SAFETY AND ENVIRONMENT

2) Temporary barricades shall be provided around the working area

prior to commencement of site work.

3) Safety signboards, warning tape and signs, cones shall be provided

around the working area confirming the safety of personnel, RLOC assets

4) Tool box meetings shall be conducted every week and the reports

5) The construction area shall be neat and tidy at all times and all unwanted materials / debris shall be transported to RLOC approved dumping site on daily basis.

6)

9. Attachments

1. JSA

2. Check list A 3. Check List B

4. Field Installation Check List

5. Insulation and continuity test for LV Cable