Hire the best freelance Pipeline Design expert designers for your company

I am formally educated in many fields of design drafting including mechanical, piping, architectural, electrical, and industrial design. I am also educated in descriptive geometry, fluid dynamics, pow... Read more

I am formally educated in many fields of design drafting including mechanical, piping, architectural, electrical, and industrial design. I am also educated in descriptive geometry, fluid dynamics, power distribution, electronics, machine tools, product development and workflow, materials sciences, safety, supervision, engineering codes, and more. I have eight years of professional experience as a piping/mechanical designer with a focus in 3D design. I have over 15 years of experience with AutoCAD software and have professionally designed complex high pressure tubing systems, offshore and onshore piping systems, unique mechanical/structural supports, electrical pipe heat tracing circuits, commercial and residential buildings, valves, eyewash stations, tanks, vessels, and heat exchangers. I enjoy learning new software and pursuing other fields of design including audio, security, outdoors/survival, pet/animal, farming, tools, and hobbies. In my spare time I design and prototype analog electrical circuits such as portable power applications, musical sound effects, amplifiers, preamplifiers, speaker cabinets, and portable music applications.

MY SELF TARUN KUMAR DUTTA Expert Mechanical Engineer , Energy , Power, Structure, Modeling /Drafting ,Designing For EPC , HVAC and MEP projects. I have more than 15 years experience in industria... Read more

MY SELF TARUN KUMAR DUTTA Expert Mechanical Engineer , Energy , Power, Structure, Modeling /Drafting ,Designing For EPC , HVAC and MEP projects. I have more than 15 years experience in industrial , production and academic projects as a mechanical engineer. My specialty in project and Production based work that is 1. Industrial Pollution Control System Fog Dust suppression system, Plain water Dust suppression system , Dust Extraction system , which include Estimation and coasting of the projects and selection of centrifugal pump selection , pipeline selection , and all pipe routine fittings etc .and related layout and schematic drawing. 2. HVAC system & MEP design Supply air and exhaust air ventilation system , Centrifugal Fan design , air washer unit design , Air conditioning System design ie. Central air conditioning system , duct able split ac , chiller ac , heat load calculation , BOQ and Equipment selection etc. 3. Gas Storage Tank and Gas Pipeline Design Executed the Project Work based on Gas Handling & Storage (Multi Cylinder installation, Pipeline Installation, LPG Tank (Bulk) Installation, Designing Kitchen Layout, supplying complete range of Kitchen Equipment's, LPG Reticulated System ,Pipe Gas to the kitchen) 4. Hot and cold Insulation of pipe and Equipment Cold & Hot Insulation of Pipe line & equipments. Measurement Insulated Pipe line and Equipment 5. Structure Design and spreader Beam EPM Plate Handling system, Circular Magnetic lifter , Rectangular Billet lifter, Rebar and Permanent Magnetic Chuck. Designing of EPM Plate handling System and Design & Drawing of Structure of Electro Permanent Magnet, Permanent Magnet, Circular Lifter, and Magnetic Chuck, design of Spreader beam. I have designed most of the structure Like spreader beam , cable reeling drum , chain and sprocket, hanging lifting lugs , shaft, coupling connection (nut bolt, weld, pin etc) 6. Layout and Design of Commercial Kitchen Equipments Designing Commercial Kitchen, Creating Kitchen Equipment layout plan by Auto-Cad 2007, 2010. Isometric Drawing of kitchen ,Bakery, Refrigeration, Bar Equipments. Isometric drawing of kitchen equipment and home furniture . I also used Auto Cad 2007,2009, 2013 mechanical , inventor , solid works 2D, 3D etc . I did prepare the report regarding Design/Drawing / Calculation / Constriction/ Manufacturing . Work for long time period , I easily considered the time and budge of the client to fulfill the right designed object.

I have 10 years of professional experience as a plant design engineer in chemical process industry. During my carrier I have involved more than 10 chemical facility construction projects as a project... Read more

I have 10 years of professional experience as a plant design engineer in chemical process industry. During my carrier I have involved more than 10 chemical facility construction projects as a project engineer. These projects enabled me to gain experience in these areas: -Mechanical Design of Industrial Plants (Chemical, oil & gas, power, food, pharmaceutical, cosmetics) -Preparing PFD P&ID Drawings -3D Pipeline Design (ASME B31.1, ASME B31.3) -Pipe Stress Analysis (ASME B31.1, ASME B31.3, Metal, FRP and GRP piping) -Static Equipment/Process Equipment Design (chemical reactors, mixing tanks, heat exchangers, etc.) -Pressure Vessel Design (ASME Section VIII, EN 13445, AD 2000 - AD Merkblätter, PD 5500, CODAP) -Storage Tank Design (Oil & Gas, solvent, acid, underground and aboveground) (API 620, API 650, API 653, EN 12285-1, EN 12285-2) I want to combine my experience and my ability in design to provide the highest quality service for my clients.

First-Class Mechanical Engineering graduate. Mechanical Design Engineering focus. SolidWorks expert. Pipeline design for Akri Flow Station, NAOC. Freelance CAD for B.G. Technical. Committed to precisi... Read more

First-Class Mechanical Engineering graduate. Mechanical Design Engineering focus. SolidWorks expert. Pipeline design for Akri Flow Station, NAOC. Freelance CAD for B.G. Technical. Committed to precision.

My name is Mohammed Abul Hassan. I have graduated at College of the North Atlantic – Qatar studying advanced diploma program in Mechanical Engineering Technology program. At present, i am pursuing Bac... Read more

My name is Mohammed Abul Hassan. I have graduated at College of the North Atlantic – Qatar studying advanced diploma program in Mechanical Engineering Technology program. At present, i am pursuing Bachelor of Science in Mechanical Engineering at Qatar University. Most people in the world have some goals in life. My aim in life is to become a mechanical design engineer. After I graduated high school, I became certain that I will pursue my higher education in mechanical engineering. The reason to study mechanical engineering is that, when I was in high school I was interested in Applied Math’s and physics. I like to apply theory which I studied in physics to solve real life problems. As a result, I have decided to study mechanical engineering. Moreover, I want interested to build hand-working skills in mechanical engineering. For this reason, I study at College of the North-Atlantic Qatar which is Canadian technical college. I have completed my advanced diploma in Mechanical Engineering Technology (industrial maintenance). In this diploma, I have learned a lot of industrial maintenance for example- reliable center maintenance, how the power plant system works, how to do maintenance in machinery equipment’s etc. Moreover, in final year I have learned how to build product from scratch. In my capstones project I build a hydraulic book lifting trolley. At first, I have done to research for the need of project. After that I calculated and design the model in 3-D software Catia V5. After finishing design I fabricated the project using college resources such as welding, fastening etc. These all techniques of fabrication I have learned in my diploma program. From this project I am interested to make career in design and manufacturing. After completion Diploma, I progressed towards B.Sc. Mechanical Engineering Degree completion at Qatar University. As a Mechanical Design Engineer, I have design and fabricated numerous projects, some of them highlighted below: -The aim of project is to design and simulate a solar powered water distillation system for rural communities in Somalia. The system consists of the evaporator, condenser, and storage tank for salty water, storage tank for distilled water, filter, pump and solar collector -The aim is to design a greenhouse that maintains the required climate to grow to tomatoes in hot and arid environments such as Qatar. The required climate includes the temperature, relative humidity, ventilation and carbon dioxide, lighting and thermal radiation, and so forth. The design is meant to meet the conditions at lower energy consumption and initial and operating cost so that to produce tomatoes that will be used for resale at a reasonable price and make profit. The design should also be reliable, have back-up systems, and be maintainable. Growing tomatoes and other crops in Qatar’s environment is important to increase food resources and production. -Aim of project describes computational and experimental investigation on the response of thin wall structures for energy absorption of car crash boxes. In this project, the tubes subjected to quasi-static axial loading. Many different cross-sectional structures have been studies to find optimal configuration for energy absorption. Initially, the Finite Element Analysis (FEA) model has been developed for different structures. From FEA model, Specific Energy Absorption (SEA) and Peak force has been estimated for different cross-sectional structures. To verify these performance parameters, quasi-static axial loading has been performed experimentally. Both foam-filled and without foam on different cross-sectional structures are implemented to study their effects on the performance parameters. The study used the aluminum alloy as a material to investigate the ability of using aluminum alloy in the energy absorption structures since the aluminum has lighter weight.

I believe that a solution should be simple and cheap, even for a complicated problem. With experience in mechanical design, CAD solid design, gear transmission, chain transmission, HVAC equipment, pip... Read more

I believe that a solution should be simple and cheap, even for a complicated problem. With experience in mechanical design, CAD solid design, gear transmission, chain transmission, HVAC equipment, pipes, ducts, heat transfer, thermodynamics, fluid mechanics and FEM analysis, I am able to provide engineering solution in many different fields. I am also familiar with basic electricity, electronics, control systems, and can write basic code in C language or MATLAB. On a personal note, I take great interest in new developing technologies and high-tech products. I also have hobbies like playing the electric guitar (and music in general), motorsport and cooking.

An organized and detail-oriented manager looking for possibilities to expand my outlook and my goals. Strong organizational, technical and analytical skills. Impeccable research, time management and p... Read more

An organized and detail-oriented manager looking for possibilities to expand my outlook and my goals. Strong organizational, technical and analytical skills. Impeccable research, time management and problem solving skills, coming from years working on engineering firms as a Model administrator and IT consultant, and as a General Manager.

Since October 2014 until present I have been working as a Mechanical design Engineer at multinational company supplier of General Electric. Here I took part in a 6 months “training on the job” program... Read more

Since October 2014 until present I have been working as a Mechanical design Engineer at multinational company supplier of General Electric. Here I took part in a 6 months “training on the job” program in Italy. Main projects for GE Oil & Gas - Nuovo Pignone: CCLNG Sabine pass LNG Umm Lulu Sakhalin Tanap

We are specialized in engineering solutions to the manufacturing and construction industry. Our main expertise is on the design, study and supervision for industrial, transport and commercial installa... Read more

We are specialized in engineering solutions to the manufacturing and construction industry. Our main expertise is on the design, study and supervision for industrial, transport and commercial installations. We can offer you a complete support, so your projects will be finished successfully. We have more than 20 years of experience working in Argentina and have also made some international projects, such as bogies for Hawai Airport and Hawail Hilton trams. Since we are CAD specialists, I would like to offer our service for drafting outsourcing.

Engineering consultancy based in Australia, specialized in engineering design and analysis. Expertise in Drafting, 3D modelling, HVAC, Mechanical, Structural engineering design. We design Workboat, Fi... Read more

Engineering consultancy based in Australia, specialized in engineering design and analysis. Expertise in Drafting, 3D modelling, HVAC, Mechanical, Structural engineering design. We design Workboat, Fishing boats, recreational boats & all other floating structure. In addition we provide Architecture 3D rendering and visualization services such as Interior, exterior 3D views & walkthrough video of residential, commercial and Industrial projects. A Multi-specialist company who delivers quality service by working closely with our clients. We carefully analyze your challenges and strive to offer the best solution suitable to your needs.

As a highly skilled in product, mechanical, sheet metal, piping and structural design with good understanding of production and assembly processes, I’m apply my knowledge and experience in design, by... Read more

As a highly skilled in product, mechanical, sheet metal, piping and structural design with good understanding of production and assembly processes, I’m apply my knowledge and experience in design, by using design tools like PMDS/ E3D / CATIA/ Solidworks, AutoCAD, Microstation and many other. I am able to administrate these tools and perform software customization to increase efficiency. Working on “Brown field” / EPCM projects I have used to work in context of scanned environment in form of PointCloud (Leica / Z+F/ LMI). I’m able to work fully independently, or as part of the team, or to take lead role with high level of responsibility and determination to complete project in shortest possible time with highest level of quality of delivered solutions or end documentation. I’m able to communicate in English, Serbian, Croatian and limited German language.

I'am 3d designer solidworks with experience more than 10 years. I can design schematic for refrigeration and design 3D drawings for projects example Hyper pack, Multi Pack & condensing unit I have ex... Read more

I'am 3d designer solidworks with experience more than 10 years. I can design schematic for refrigeration and design 3D drawings for projects example Hyper pack, Multi Pack & condensing unit I have experience in the field of refrigeration pipe & construction frame design for more than 5 years I can design product drawings for molding because I have experince more than 5 years in design product until rendering i can draw 2d and to make for 3d drawing solidworks or vice versa I'am familiar with solidworks weldments & sheet metal because I have experience 4 years in constuksion bus My key abilities are : Solidworks, SolidWorks Surfce, Solidworks weldments, SolidWorks sheetMetal, SolidWorks 2D, SolidWorks Piping, AutoCad Inventory, 2D Drawing and drafting, 3D Design, Product Design, Industrial Product Design, Mechanical Design Engineering, Stl files for 3D

ladies and gentlemen I'm a Man of many talents studied Mechanical Engineering at Alexandria University. PS: you can rely on me Read more

ladies and gentlemen I'm a Man of many talents studied Mechanical Engineering at Alexandria University. PS: you can rely on me

I have long experience and am trying to build a reputation here.I am an experienced engineer with Bachelor degree in mechanical engineering, skilled in problem solving with strong maths and physics b... Read more

I have long experience and am trying to build a reputation here.I am an experienced engineer with Bachelor degree in mechanical engineering, skilled in problem solving with strong maths and physics background. I've more than 10 years experience as a design mechanical engineer as a freelancer and working as a maintenance engineer in an oil and gas company as a daily bases. I'm a professional user to several computer designing software and I can apply all testes and design checks on my parts before sending it to manufacture. I'm professional in issuing drawings in 2D & 3D model for complex mechanical parts, I got great experiencing in machine part design, 3D printing, sheet metal design, CNC machining, piping, pumps and plastic injection molding. I'm able to create file and deliver us ready-to-print STL files. My software expertise are : Solidworks12 CATIA V5 Pro-Engineer, Autocad12, Autodesk Inventor ALIAS 3D ANSYS12 PDMS CAESER II Proficiency | 2D and 3D Sketches, Detailed Drawings, Computer Drawings, Computer Illustrations, Graphic Design, Cad Drawings, Technical Drawings, Technical Illustrations, 3D solid Modeling, Mechanical Modeling, 3d NURB Surface Modeling, 3D Rendering, some skills in 3D animation.I got strong understanding of prototyping and product finalization. Kindly have a look at my portfolio and projetcs

Am working as Design engineer for Hydac India from August 2016 to present. Read more

Am working as Design engineer for Hydac India from August 2016 to present.

Four Year of experience from Department of Space. Read more

Four Year of experience from Department of Space.

Pipe stress analysis and design engineer with more than eight years of office and field experience in power plant projects (gas and steam turbines, boiler plants), process piping (blast furnace, direc... Read more

Pipe stress analysis and design engineer with more than eight years of office and field experience in power plant projects (gas and steam turbines, boiler plants), process piping (blast furnace, direct reduction plants, slurry transportation, cryogenic piping, etc.) and oil & gas projects (refineries, oil fields). Developed competences in most important piping codes (including ASME B31.1, ASME B31.3, EN-13480, etc.), and acquired proficiency in all aspects of static and dynamic pipe stress analyses (seismic, PSV transients, water hammer, harmonic vibrations, high-frequency vibrations, etc.) including generating critical line list, preliminary route studies and equipment arrangements, building load cases to satisfy code requirements, support design and analysis and fatigue assessments. In-depth knowledge of piping layout design using 3D software. In addition to pipe stress analysis and piping design, which is the primary field of expertise, during the work at the University of Belgrade (as PhD candidate), developed skills in pressure vessel analysis (ASME VIII-1, ASME VIII-2 and EN-13445), process equipment sizing, process design and optimization, heat and mass transfer calculations, fluid flow calculations (steady state and transient, including interaction with the stress analysis), CFD calculations, programming as well as advanced measurement and research techniques which has all proven extremely valuable in the practice. First author and co-author of several engineering and scientific research papers.

I am an engineering graduate having more than 8 years of experience in design, R & D. My expertises are in Solid works, Solid edge & Autocad. My work includes 3D modeling, 2D drafting, reverse engine... Read more

I am an engineering graduate having more than 8 years of experience in design, R & D. My expertises are in Solid works, Solid edge & Autocad. My work includes 3D modeling, 2D drafting, reverse engineering, rendering, product development, piping design, layout & machine design...Some of my projects are: 1. Truck mounted cranes (reverse engineering & development) 2. Automobile car recliners & sliders (complete design & development) 3. Evaporators for sugar industries like Al Khaleej Dubai. 4. Various sugar industry equipments like melter, evaporators, circulators, condensers & ejectors.

• To Design PLANT LAYOUT for proposal as per client’s requirement. • Preparation of “CIVIL AND MECHANICAL G.A.” as per client’s approved plant layout. • Preparation of PFD (Process Flow Diagram). • Pr... Read more

• To Design PLANT LAYOUT for proposal as per client’s requirement. • Preparation of “CIVIL AND MECHANICAL G.A.” as per client’s approved plant layout. • Preparation of PFD (Process Flow Diagram). • Preparation of P&ID(PIPING AND INSTRUMENTATION DIAGRAM). • To prepare the FABRICATION DRAWINGS for the components to be fabricated. • Preparation of PIPING DRAWINGS. • To generate the BOM (BILL OF MATERIAL) for every drawings of the respective projects. • To visit the respective site for checking the progress and cross checking the practice difficulties and introduce them in the drawings as well as layouts.

An experienced Mechanical Design Engineer with a proven track record of success of over 20 years in commercial engineering market sectors mostly within the water industry along with some industrial ap... Read more

An experienced Mechanical Design Engineer with a proven track record of success of over 20 years in commercial engineering market sectors mostly within the water industry along with some industrial applications. Providing high-level mechanical design engineering practices to build consistently improved business performance. Recognised for commitment & quality of work to identify solutions for customer issues, undertaking and assuming additional responsibilities. Strong leadership, strategic planning & design & development experience. Deadline driven & quality focused, with excellent relationship management skills. Experienced in assessing the whole project scope, end to end project management, design reviews, systems analysis, solution definition, design & development, testing, manufacturing, hydraulics, mechanical fault diagnosis & resolution for a wide variety of equipment, quality control & assurance, documentation, project budget control, equipment procurement, design supervision, H&S risk assessment, installation method statements & system updates.

We provide following design & development services :- · 2D Manufacturing Drawing & 3D Modelling of single part & assembly. · Prepare 3D Model & 2D Drawing by Measuring a parts. · Crea... Read more

We provide following design & development services :- · 2D Manufacturing Drawing & 3D Modelling of single part & assembly. · Prepare 3D Model & 2D Drawing by Measuring a parts. · Creating Exploded Isometric Drawing of Assembly with Bill Of Material. · Structure Design, Analysis & Fabrication Drawing. · Design & Development of Machine. · Fixture Design for Robotic / Manual Welding, Machining Process & Assembly. · Sheet Metal Design, Modelling & Cutting Layout of Sheet for Laser & Water Jet. · Pressure Equipment Design (As per Design Code) & Fabrication Drawing. · Piping & Routing Design, Modelling & Isometric Drawing. · Design New Machine from Old Design / Machine by Reverse Engineering. · Develop Conceptual Design from Client Requirement / Instruction. · Working Animation of Machine & Motion Analysis. · Prepare Presentation of Machine. · Create Realistic Photo Copy of Machine (Render Image) by using Virtual Model. · Develop Part Number, Assembly Number & Drawing Number Generating Chart which help in ERP systems. · Mould Design, Die Design (Casting, Punching & Roll Forming). · Injection Moulding Die Design. · Static, Dynamic & Thermal Analysis of Machine. · Vibration Analysis of Machine. · Motion & Flow Simulation. · Industrial Training of Various Design Software. Please follow below link to find our work portfolio : https://drive.google.com/open?id=1XX9XgKDlvsNwevm979S870HEmqLCPaTv E-mail us your design requirement or design problem. Visit Us on :- www.hexspurdesigns.com Authorized License User Of SolidWorks & G-Star CAD

I am a Design Engineer and I have more than six years of working in software like Autocad, Pro-E, Catia, Unigraphics, Solid works,Ansys.I had done many Projects for Automobile, Plastic and Heavy Engin... Read more

I am a Design Engineer and I have more than six years of working in software like Autocad, Pro-E, Catia, Unigraphics, Solid works,Ansys.I had done many Projects for Automobile, Plastic and Heavy Engineering industries.I have good innovative skills which is needed for success for an organization.Timely delivery and Client satisfaction are my priorities.

Design engineer with more than 8 years of experience in HVAC industry. Experience in 3D design of sheet-metal parts and assemblies. Experience in nesting and elaboration of programs for CNC punch p... Read more

Design engineer with more than 8 years of experience in HVAC industry. Experience in 3D design of sheet-metal parts and assemblies. Experience in nesting and elaboration of programs for CNC punch press. Experience in CNC programming with Delcam FeatureCAM. Experience in design of jigs and fixtures. А quick problem-solver, takes ownership to meet short deadlines, highly flexible and adaptable to new situations. Excellent attention to detail

I am expert and passionate in AutoCAD architecture designs (Interior and Exterior designs). I having 21 years experiences of AutoCAD designing, architectural designs, 3d modeling and rendering, water... Read more

I am expert and passionate in AutoCAD architecture designs (Interior and Exterior designs). I having 21 years experiences of AutoCAD designing, architectural designs, 3d modeling and rendering, water supply & sanitation pipelines designs, roads designs and GIS technician. I completed many projects and all my clients are satisfied of my work and behaviors. I am delivering the project in time with best quality and as per client’s specification. Client satisfaction is my top priority. for this reason, I do not apply in any job that I am not 100% capable of doing. It’s very easy: - Send me a short Brief of your project, a Photo, a Sketch, a PDF or you can simply tell me what you need. I will take your Architectural project then carefully revision and modify it with your expected imagination and time frame. What I can offer: - 1. Architectural Site plan. 2. Landscape Design. 3. Floor plans with Furniture layout. 4. Elevations + Sections. 5. Vectorize Drawing & Drafting. 6. Architectural detail working Drawings. 7. Preparation of Municipal Drawings. 8. 3D floor plans. 9. 3D Models Realistic Renders/3D Views. 10. 3D Animation/Walk through. 12. Pipelines Plan, cross section and longitudinal profile including valve chambers and hydraulic calculation. 13. Grading and Parcel drawings. 14. Product designs with correct scale and dimension. 15. Print ready PDF files/Images/Source files. I work with AutoCAD, AutoCAD Architecture, Civil 3d, ArcGIS, Qgis, Staad pro and Adobe illustrator. Prices and time will be negotiable always. Thank you. Subhash chand mahich www.mahichgothara.com

2011-2017: *Field of study: Civil Engineering, at University of Science and Technology - University of Danang 2017-2018: *Civil Engineering Team Leader at Civil Engineering & CAD Drafting company in... Read more

2011-2017: *Field of study: Civil Engineering, at University of Science and Technology - University of Danang 2017-2018: *Civil Engineering Team Leader at Civil Engineering & CAD Drafting company in Vietnam 2018-2018: Business Consultant Training Program In Civil Engineering in California, US 2018-Present: Founder of Civiloutsourcing.com

I am an Engineer with high creativity and critical thinking, Read more

I am an Engineer with high creativity and critical thinking,

I am a Civil Engineer, working in the construction and mechanical industry since 1998. I have worked on different projects and companies, from Residential and commercial building to complex infrastruc... Read more

I am a Civil Engineer, working in the construction and mechanical industry since 1998. I have worked on different projects and companies, from Residential and commercial building to complex infrastructure projects. In Pakistan I have worked mostly on residential building and villas, when Pakistan’s first Motorway project was launched I became a part of pioneering team. I worked there on M2 Lahore to Islamabad motorway project and was in-charge of Culverts and small underpasses which ran under the motorway to facilitate the locals, villagers and animals of the area to cross under the road. In 2007 I moved to United Arab Emirates, here I mostly worked on infrastructure projects based in Dubai and Abu Dhabi. My focus was utilities, like potable water, sewerage and sanitary water, storm water drainage and irrigation most of the time. But I also worked on electrical networks and fiber optic cables for telecoms and traffic. With the experience spanning more than 2 decades I have decided to now shift my attention to freelancing world. As the world is changing repeatedly so is the way to work. Freelancing is the most comfortable way to express my abilities and find new technologies and meet new people which I truly enjoy. I can work on Civil and Mechanical projects, detailed drawings for Tools and Assemblies, Floor plans, Front elevations, Architectural details and sections for buildings as well as Layouts, profiles and sketches for infrastructure work you name it. Elementary survey (on ground and trial trenches) details or complex works of layout and profiling an area for any utility or structure I am your expert to do it all. I like to take up challenges, freelancing will present my skills to the whole world. I also have good communication skills as I had worked with many multinational companies, consultants and clients with nationalities in Pakistan and abroad, from all around the world. Meeting dead lines, finishing work with accuracy and professionalism is my trademark. For comfort and peace of mind to my client I keep direct and constant connection, till the work ends.