MOS, Method of Statement of Weldinng, Biện pháp hàn ống, Cách hàn ống trong hệ thống của Tòa nhà cao tầng, nhà máy, văn phòng cao ốc có sử dụng đường ống vật liệu kim loại, bao gồm ống vật liệt bằng sắt, đồng, thép không rỉ
PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 - METHOD STATEMENT FOR MVAC WELDING Prepare by : SUB CONTRACTOR NAME: Hong Soon Min DATE : 08-April-2015 Submission Ref :PSC-HK-MS-M-0004 Checked by : Approved by : POSCO NAME: POSCO NAME: NAME: DATE : DATE : DATE : Date: 08-April-15 Revision: Rev00 MVAC Services Consulted by: Page HKL PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 Table of Contents 1.INTRODUCTION .3 1.1 Purpose 1.2 Scope 1.3 Exclusions .3 GENERAL 2.1 Program 2.2 Location Address 2.3 Approvals 2.4 Labor resources 2.5 Communications 2.6 Site Resources Required 2.7 Temporary material .4 2.8 Protection 2.9 Equipment/Tools 2.10 Hot works 2.11 Confined space works .6 2.12 Emergency & Safety Equipment .6 2.13 Materials required for installation 2.14 Schedule of drawings 2.15 Schedule of inspection 2.16 Attendees 2.17 Safety Briefing 2.18 Mitigation of Risk .10 Actual Works Method Statement 10 3.1 Delivery and Store .10 3.2 Welding .10 3.2.1 Drying welding rods .10 3.2.2 Marking pipes 11 3.2.3 Ventilation 11 3.2.4 Methodology 12 3.2.5 Welding guide 13 3.3 Setting to work .61 3.4 Testing 61 3.5 T&C Register 62 3.6 Reports 62 Appendix 64 4.1 Certificate of calibration 64 4.2 Instrument catalogue and manual .70 4.3 Certificate of welders ………………… 71 MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 INTRODUCTION 1.1 Purpose The purpose of this Method statement is to bring the requirements from the technical specifications, drawings together in one convenient document for reference by the drafters, factory, site installers, QA/QC and all parties who are concerned with the project And this methodology to be followed for the welding of the chilled water piping, condenser water piping and fitting into the high or low level and the inspection 1.2 Scope This is applicable to the welding of all chilled water pipes, condener water pipes as set out in the project technical brief and the approved drawing 1.3 Exclusions Not application GENERAL 2.1 Program 2.1.1 Ensure that the shop drawing used for the references at site is approved for construction 2.1.2 Ensure that designated manpower to conduct works at site must be properly trained and well oriented by the safety engineer 2.1.3 All equipments, tools and mobile scaffolding to be used must be inspected and approved by authorized safety engineer at site 2.1.4 All staffs associated with the works shall be sufficiently experienced 2.1.5 When the workers climb up the working platform, ladder, his hands must be free 2.1.6 All materials to be used at site must be properly secured and clean 2.1.7 Working period to base on civil work and piping installation schedule which will be attached after getting approval (Waiting for approval) 2.2 LOCATION – ADDRESS Application for Basement and all high floors 2.3 APPROVALS Materials of submission (Waiting for submission & approval) Shop drawing (Waiting for submission & approval) MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 2.4 LABOR RESOURCES The pipe team will coordinate and carry out as below organization chart: 2.5 Communications Office mobile phone or walkie-talkie will be used during working time 2.6 SITE RESOURCES REQUIRED Temporary fire protection equipment Site electric panel should be needed as site condition 2.7 TEMPORARY MATERIALS Materials cover needs to be prepared on the floor and cover pipe when needed 2.8 PROTECTION Materials cover needs to be prepared on the floor and cover pipe when needed MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 2.9 EQUIPMENT/TOOLS Ensure the availability of equipment and tools provision for AC Piping welding works as follows: Welding clothes/gloves Wire Brush Silver ink marker pen Welding dryer Grinder Clean rug and cloth Protective Glasses Electric Arc machine Hammer 10 Lighting 11 Fire Extinguiser 12 Caution Tape 13 Welding rod 14 Scaffolding 15 Fire blanket 16 Level measure MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 2.10 HOT WORKS Hot works comprise of the welding and will be carried in accordance with hanger, support weld instruction manual The hot welding will be under tolerance clean workshop environment to ensure no risk of dirt contamination Where such exothermic wielding works are in progress, fire extinguishers shall be provided at full times When such exothermic welding is carried out, the workers shall be provided with welding gloves Hot works proposed for on site The place to be proposed at basement floor 2.11 CONFINED SPACE WORKS Not application 2.12 EMERGENCY & SAFETY EQUIPMENT 1) Safety helmet 2) Safety shoes 3) Safety uniform 4) Hand gloves MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 - 5) Safety goggles 6) Fire extinguisher 7) Welding mask 2.13 MATERIALS REQUIRED FOR WELDING MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 GI pipe & black steel pipe, fitting as elbow, tee, reducer, flang, bracket, welding rod Black steel (BS) pipe GI pipe BS fitting GI fitting Flange C-channel Welding rod 2.14 SCHEDULE OF DRAWINGS Refer to shop drawing layout of floors as below: 2.15 SCHEDULE OF INSPECTION Refer to ITP form as the attached file in below MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 2.16 ATTENDEES 2.16.1 Sub-contractor manager 2.16.2 Sub-contractor site manager 2.16.3 Main contractor MEP coordinator 2.16.4 Main contractor mechanical engineer 2.16.5 HKL M&E manager 2.17 SAFETY BRIEFING 2.17.1 Safety shall be in first priority during construction, safety staff shall be present on site all the time to supervise and to remind workers to observe safety requirement Stop work order shall enforce once its dose not meet the safety requirements 2.17.2 Safety shall conform strictly observed All workers and staff on site shall be oriented of safety requirements All safety equipment such as cloths , shoes, helmet , gloves , safety belt should provide and regularly checked during construction 2.17.3 The engineer shall inspect all subcontractor tools prior to be used on site 2.17.4 Safety Supervisor shall be present for all the safety site inspection 2.17.5 For the safety of worker, grounding wire for the electric ARC process must be provided and wet cloths, protective glasses, long sleeve cloth must be imposed to worker 2.17.6 Fire extinguisher shall be provided at welding area and safety provision must done to ensure usage workability 2.17.7 Safety working with Scaffolding 2.17.7-1 All scaffolds must be erected under the supervision of a competent and experienced person- usually the construction superintendent This includes moving scaffolds from one position to another Each leg of a scaffold must be supported by and adequate footing Loose bards, bricks and other material not provide a safe, adequate base 2.17.7-2 Where the working platform in more than 10 feet off the ground, the scaffold shall have guardrails installed 2.17.7-3 If people are working under the scaffold, toe boards must be used to prevent tools and materials from falling on them 2.17.7-4 Workers are not to climb the metal tubular frame of the scaffold to get the working platform Other, safer means of access must be used – a ladder or access from the building 2.17.8 Safety working with Mobile Scaffold MVAC Services Page PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT MVAC FOR WELDING 08 APRIL 2015 - 2.17.9 Mobile scaffolds have restricted reach unless a guy wire secures them They are more susceptible to overturning and require a smooth, level working surface A complete guardrail system must be used at elevations above 10 feet and shall be used at all working levels Scaffold should be moved when unoccupied and only by pushing from the base Wheel brakes must be set when scaffold is in use 2.18 MITIGATION OF RISK Impact damage during pouring of concrete installation to be monitored constancy white concrete is poured Correct connections or materials, ensure the final installation and connections are inspected and signed off with photographic records by MEP coordinator on site M&E staff from contractor, architect and client ACTUAL WORKS METHOD STATEMENT 3.1 DELIVERY AND STORE Materials arrived to site shall be inspected and stored according to manufacturer recommendations Materials shall be stored in the covered and dry space During the receiving materials of pipe & fitting, manpower shall be used to make piping system The pipe and accessories shall be protected and covered with polythene sheets before installation and welding 3.2 Welding 3.2.1 Drying welding rods All welding rods shall be dried by the equipment shown below: MVAC Services Page 10