02 MS for leak test old

3 REFERENCES DOCUMENTS3.1 Project specifications S-000-1312-1001V Construction Specification for Site Preparation and Earth WorkS-000-1310-Q001V Detailed Engineering Design Data for Civi

METHOD STATEMENT OF LEAK TEST FOR MANHOLE

(DOCUMENT CLASS: X)

Operation Centre JOB Code: Operation Centre Doc No.:

1 PURPOSE 4

2 SCOPE OF WORK 4

3 REFERENCES DOCUMENTS 5

3.1 PROJECT SPECIFICATIONS 5

S-000-1312-1001V CONSTRUCTION SPECIFICATION FOR SITE PREPARATION AND EARTH WORK 5 S-000-1310-Q001V DETAILED ENGINEERING DESIGN DATA FOR CIVIL AND STRUCTURE 5

S-000-1320-1001V CONSTRUCTION SPECIFICATION FOR CONCRETE WORKS 5

S-000-1671-0916V INSPECTION AND TEST PLAN FOR SITE CONCRETE WORK 5

3.2 DRAWINGS FOR CONSTRUCTION 5

D-000-1320-1001V CONCRETE WORKS GENERAL NOTES 5

D-000-1320-1002V TO 1004V STANDARD DETAILS FOR REBAR ARRANGEMENT 5

D-000-1320-1005V STANDARD DETAILS FOR CONCRETE STRUCTURES GENERAL 5

ARRANGEMENT 5

CONSTRUCTION DRAWINGS FOR MANHOLES 5

CONSTRUCTION DRAWING FOR PIPES 5

3.3 STANDARDS AND CODES 5

4 ORGANIZATION CHART 7

5 MACHINERY AND EQUIPMENT 8

6 MATERIALS 9

6.1 Concrete Brick 10

6.2 Rebar (Reinforcement) 10

6.3 Structure Concrete 10

6.4 Formwork 10

6.5 Joint Materials 10

7 MANPOWER 10

8 RESPONSIBILITIES 11

9 PROCEDURE AND SEQUENCE 12

9.1 Mobilization 12

9.2 Equipment setting-up 12

9.3 Setting out 12

9.4 Layout Marking 13

9.5 Execution of Leak Test for Manhole 13

10 INSPECTION AND TESTING 23

11 HEALTHY, SAFETY AND ENVIRONMENT (HSE) 24

11.1 Responsibilities 24

11.2 Safety measures 24

11.3 Environmental protection measures 24

11.4 First Aid 25

12 WORKING IN CONFINED SPACE 25

12.1 GENERAL REQUIREMENT 25

12.2 COMMUNICATION 27

12.3 PERSONAL PROTECTIVE EQUIPMENT 27

12.4 RESPIRATORY PROTECTION 27

12.5 ELECTRICAL EQUIPMENT INSIDE A CONFINED SPACE 27

12.7 TRAINING IN RELATION TO WORK IN A CONFINED SPACE 28

12.8 WORKPLACE INSPECTION 28

12.9 RESCUE 29

13 APPENDIX 30

The purpose of this Method Statement is to describe the methodology involved in the works of Leak Test for Manholes and Pipe and detail the steps to be taken in meeting the technical standards and HSSE requirements of NSRP Complex Project

This Method Statement covers the works related to inspection and leak detection (if any) for all the manholes which are located at the areas of C200 and C300 to ensure that the entire execution stages of work is done in line with good JGCS’s Engineering practices and compliance with JGCS’s Engineering standard practices, national and local codes

3 REFERENCES DOCUMENTS

3.1 Project specifications

S-000-1312-1001V Construction Specification for Site Preparation and Earth WorkS-000-1310-Q001V Detailed Engineering Design Data for Civil and StructureS-000-1320-1001V Construction Specification for Concrete Works

S-000-1671-0916V Inspection and Test plan for Site Concrete Work

3.2 Drawings for construction

D-000-1320-1001V Concrete Works General NotesD-000-1320-1002V to 1004V Standard Details for Rebar ArrangementD-000-1320-1005V Standard Details for Concrete Structures General

ArrangementConstruction Drawings for Manholes

Construction drawing for Pipes

3.3 Standards and Codes

TCVN 4453 Concrete structure and Reinforced Concrete Technical

Requirements

BS 8007 Code of Practice for Design of Concrete Structures for

Retaining Aqueous Liquids

BS EN 12350 Testing Fresh Concrete

BS EN 13263-1 Testing Concrete in Structures - Part 1: Cored Specimens

Taking, Examining and Testing in Compression

4 ORGANIZATION CHART

Site Manager: Do Minh Chau

Directly in charge for daily schedule, mobilization of equipment, materials supply capacity.

Survey, daily schedule, location of work, equipment control, labor for each kind of works

HSSE

HSSE Manager: PN GiangHSSE Supervisor: LH Trung,

VN Hai,HD Bach, DT Ninh

Equipment HSSE control, Permit, access way, Traffic, Labor entry, HSSE training, HSSE at work place

- Labors for works

- Minor tool and

Const Equipment

Condition and number

of Equipment, fuels, drivers, transportation,

5 MACHINERY AND EQUIPMENT

•

Prior to using any machineries/equipment at site, it will be inspected and certified by

qualified person

•

Periodic Preventive Maintenance will be made by all equipment and machineries

0 All operators and drivers are to be educated with valid driver's license/operator's license or permit

Only authorized signalman will be assigned together with the driver or operator

Equipment Name, Capacity N

os

Year of Manuf

22001-2011 Japan

52008-2011 Japan, Vietnam

12 Concrete agitator truck 8 m3 0

82008-2010 Korea, China

32008-2010 Japan

unless/otherwise approved by Contractor.

• All material shall either carry a quality certificate from the approved source or be tested to the

satisfaction and approval of Contractor

6.1 Concrete Brick

0 Concrete brick shall be used for construction of Temporary wall for plugging opening

1 holes on Manholes, it shall be removed after completion of Leak test

6.2 Rebar (Reinforcement)

Rebar for Concrete work (at the connection location between RC Pipes and Manholes) shall comply with ASTM A-615 Grade 60 and approved by JGCS (refer to D-000-1320-1001V Drawing)

6.3 Structure Concrete

Concrete using for installation of Pipes (GRP Pipes or RCP Pipes) is concrete type Mix-A which comply with Specification S-000-1320-1001V and Drawing D-000-1310-1Q01V

- All workers must to have name card for travel on the site

Table 7.1: LIST OF MANPOWER FOR LEAK TEST WORK

3 Driver of Concrete truck 1 2

9 PROCEDURE AND SEQUENCE

9.1 Mobilization

9.1.1Obtain valid permit to work (PTW) and other required certificate related for the works

9.1.2Prior to enter the working area, all equipment and machinery will be inspected by safety personnel

9.1.3All machineries, equipment and material shall be entering using the designated entrance gate

9.1.4Ensure that Vinaconex E&C shall comply with traffic management plan and safety transportation plan

9.2 Equipment setting-up

9.2.1All material, machineries and equipment shall be located at designated area

9.2.2Setting-up of equipment will be done by Supervisor by adhering to all safety measurement and requirement outline

9.2.3Upon completion of set-up, joint inspection will be carried out to satisfy all parties and ensure all relevant equipment/machineries shall be complied

with safety rules and regulation.

9.3 Setting out

9.3.1Prior to the work commencement, construction drawing will be reviewed to check of its latest issuance for construction and all essential details are given It will

be checked that the intermediate dimension agree with the overall dimension

9.3.2The setting-out will be made at the beginning stage of the work by referring

to the construction drawing and all reference points will be made necessary for the entire work This will be acquired and develop method of checking and cross-checking

on all setting-out operations When principal lines and levels have to be set-out, it would

be advised to be the relevant persons

9.4 Layout Marking

Layout and marking will be marked using surveying equipment having a valid calibration

certificate and will be verified by QC

9.5 Execution of Leak Test for Manhole

Depend on the actual condition of construction site as well as the planning of the contractor, the

system of pipes connect to Manhole shall be executed at the same time or at another time withthe work for construction of Manhole The method statement of Leak test for manhole shall be divided into cases based on actual conditions of construction activities on site

The sequence of Leak Test for Manhole and Pipe shall be in compliance with the chart asfollowing:

Plugging the Openings of Manhole-exclude pipe

between 2 manholes leak test (Using Masonry block with Plastering Surface)

Preparation (Equipment& Material Mobilization, Setting out…)

Backfilling Work for the Manhole and Removal of Sheet

pile (with deep Manhole)

Not ok

Ok

Table 9.5.1: SEQUENCE FOR EXECUTION OF LEAK TEST FOR MANHOLE AND PIPES

Backfilling Work for Pipes (After Completion of Leak Test)

Excavation Work and Installation Work for the Pipes

Leak test (Leak Test at Position of Connection Joint between

Pipes Manhole)

Repair Joint

accordance with the relevant IFC Drawings.

- The Contractor shall install sign board, site regulation and safety notice in the construction site in accordance with the Project specification

- The suitable safety barricade shall be installed around construction area and approved by JGCS engineer prior to starting work

- The contractor shall contact with security for approval of transportation of vehicle get in the construction site

b Equipment, Manpower and Material mobilization

- Equipment, man power and material for execution of Masonry Work, Pipe installation and Leak Test shall be mobilized and really for using prior to construction

activities

9.5.2

Plugging the Openings of Manhole (excluding pipe between two manhole)

- Process to construct a temporary wall of concrete brick for plugging the openings of the manhole which shall be Leak Tested afterward

- The internal side of temporary wall shall be cover with cement plaster

- Check for the tightness of wall and the quality of plastering layer for ensuring that

there is no leakage able to happen through the wall as well as the connection with the manhole wall

CONSTRUCTION MASONRY BLOCK FOR PLUGGING THE OPENING

Sheet pil e Top of paving

har d bar r icade

Top of paving har d bar r icade

Masonr y bl ock W/ pl aster ing l ayer Concr ete br ick

pl aster ing l ayer

stair with handr ain access and egr ess way

Sheet pil e

Backfilling Work for the Manhole and Removal of Sheet pile (apply with deep Manhole)

Execution of Backfilling works shall be executed in compliance with Contractor Doc No VV3120-008-A-117: "Method Statement for Excavation works"

The backfilling work shall be carried out layer by layer to the ground level When finishing the work, Vinaconex.EC shall remove existing sheet pile around the manhole

The work for removal of sheet pile shall be executed sequential and under the supervision of JGCS Engineer

-Top of paving

har d bar r icade har d bar r icade

BACKFILLING WORK FOR MANHOLE

9.5.4

Excavation Work and Installation Work for the Pipes Connect to Manhole

Depend on the actual condition of construction site as well as the planning of the contractor, the system of pipes connect to Manhole shall be executed at the same time or at another time with the work for construction of Manhole In case the pipes system is installed in other stage with Manhole, the excavation and installation work for pipes shall be carried out separately

The temporary wall shall be removed prior to starting the pipe work Detail for connecting Pipes to Manhole is in accordance with design drawing

-har d bar r icade

el :

el :

INSTALLATION PIPE INTO MANHOLE

9.5.5

Leak Test

After finishing installation and connection Pipes between two manholes, the contractor shall carry out Leak test for manholes to check the leakage at positions of connection joints with pipes

The Leak test shall be carried out as the following steps:

- Step 1 : Fill water into the manhole up to a specific level which not exceeding 1,5meters above the pipe soffit level

 Step 2: Until the water level shall be made up to produce the required test headmentioned above, the test shall commence Time for process of leak test shall be atleast one hour after filling the test section unless otherwise having a specific timefrom instruction of the Jgcs Engineer

 The system is deemed to have passed during the test period if the leakage is lessthan the following values:

1,0xD litter/Linear metre run of Pipe (Per one hour)With: D - Pipe diameter (m)

LEAK TEST FOR CONNECTION JOINT OF MANHOLE

9.5.6

Backfilling work for pipe

When finishing Leak test and no leakage is detected as well as having the approval from JGCS Engineer, the back filling work shall be conducted It means that leak test procedure for the manholes is completed

Execution of Backfilling works for the pipes & manholes shall comply with Contractor Doc No W3120-008-A-117: “Method Statement for Excavation works”

har d bar r icade

el : WATER LEVEL FOR LEAK TEST

har d bar r icade

BACKFILLING WORK FOR PIPES

The Site Inspection and Test Plan (ITP) for this work summarize various characteristics to bechecked The concerned Site Engineer/Foreman will be responsible to ensure stage wisecompliance for these operations and the Site QA/QC Engineer/Inspector will carry-out qualitycontrol checks and report the inspection results

har d bar r icade

el :

har d bar r icade

el :

pIPE SOFFIT har d bar r icade

11 HEALTHY, SAFETY AND ENVIRONMENT (HSE)

study carefully Job Safety Analysis and Risk Assessment for the works before starting, participate

at Tool Box meeting in every morning

• Safety and security staffs of our management team strictly complied with the regulations on HSSE issued for the project Sufficient Persona! Protective Equipment (PPE) for workers such asglove, hard-hat, safety boots, glass, protective clothing should be provided Electrician shall haverubber insulation gloves etc All workers, during construction must wear uniformed PPE

• Provide sufficient lighting for construction works at night-time

• For construction equipment, prior to construction, it is necessary to check equipment’s operation and carry out trial run The equipment, before being used shall be verified and shall getthe verification certificate from the JGCS HSSE’s team The equipment and machine shall be maintained at a periodical basis in accordance with the specified regime The warning system must be kept during the construction activities

• For explosion/fire prevention work at fuel storehouses, and other inflammable areas, the sub-contractor will provide fre fighting device, slogan and instruction to remind workers on the safety assurance, install fire fighting notice sign

• The Contractor organizes a first-aid force on site and signs a contract with local medical hospital to get ready to give emergency-aid and treatment when accident at work is happened

11.3 Environmental protection measures

• The Contractor will obtain licenses, and procedures required for environment protection fromthe local authority

• Enhance frequently knowledge of environment for construction staffs and local resident Popularize measures to minimize the effects to environment

• Cleaning frequently and watering the road in and out near the project Truck for soil transport

should have cover sheet, daily water cleaned at truck wash.

• All stockpiles of excavated soil within the site will be less than 3m height, kept clean, in order

to minimum dust pollution

• Regularly spray water against dust during construction

• Speed of truck and cars at the Site shall not exceed 20 km/h (average 15 km) Cargo trucks

of soil shall be covered by canvas Moving on constructed permanent road is 30 km/h max speed

• No directly discharging wastewater into the surface water drainage system

• Water of rains overflowing construction area shall not be disposed directly into public

drainage system Drainage system shall be checked and maintained frequently.

11.4 First Aid

• First aid facility is always made available during working hours by a qualified first aiders wearing of the basic PPE will be enforced fully

• Ambulance car with Driver, Helper and stand by Nurse are available at site at all times

12.1.1Risk assessmentPrior to any entry being permitted to a confined space a risk assessment shall be conducted by persons who are trained and competent in conducting risk assessments The risk assessment shall determine the level of risk associated with the work that is being undertaken within the confined space taking into account the hazards identified.The risk assessment is to be conducted by a competent person(s) and is to be reviewedfollowing the opening and subsequent inspection of the confined space to ascertain whether all hazards and risks have been identified and assessed

Risk assessments shall be conducted for all work that involves entry into a Confined Space Such assessments shall be documented and be included in the WMS and shall address the relevant hazards associated with the scope of work

12.1.2Medical Assessment / Fitness of Entry PersonnelThe CONTRACTOR/ Subcontractor shall ensure that their personnel who may be considered for Confined Space entry work have had their physical condition and fitness