COLLEGE OF ENGINEERING
DEPARTMENT OF MECHANICAL AND INDUSTRIAL ENGINEERING
MECH 399 Practical Training
Course: Summer training
Name: Yazan Younes ID: 201404308
Prof. Abdel Magid Hamouda/ [email protected] / B-09 / 4404 4303
Table of Contents
TOC o “1-3” h z u Abstract: PAGEREF _Toc522973853 h 3Introduction: PAGEREF _Toc522973854 h 3Company information: PAGEREF _Toc522973855 h 3Company contacts: PAGEREF _Toc522973856 h 4Supervisor area of knowledge and expertise: PAGEREF _Toc522973857 h 5About our project: PAGEREF _Toc522973858 h 5Site information: PAGEREF _Toc522973859 h 6Tasks company works on: PAGEREF _Toc522973860 h 6My work: PAGEREF _Toc522973861 h 7What is the AHU and how does it works: PAGEREF _Toc522973862 h 7What is the FCU and how does it works: PAGEREF _Toc522973863 h 8What is the direct expansion and how it works: PAGEREF _Toc522973864 h 9Tasks assigned for the last two weeks: PAGEREF _Toc522973865 h 10What is the snag list and what I was doing with it: PAGEREF _Toc522973866 h 11New knowledge: PAGEREF _Toc522973867 h 13I have learned new things, one of these things is HVAC: PAGEREF _Toc522973868 h 13The second thing I have learned is the firefighting system: PAGEREF _Toc522973869 h 14Types of firefighting pumps I saw PAGEREF _Toc522973870 h 14
I have done my summer internship in a company called Mechatronics, it is a MEP contractor company, which has a contract with QDVC, working for the rail. which is my communication skills specially when working with people from different nationalities and backgrounds, also I have gained a very important skill I need in my engineering life which is my team management skills and try to improve my knowledge more and more by sharing ideas and different sets of information with my colleagues, I have tried to learn how to lead a team and how to finish my work with my team on the time assigned. I have tried my best to learn from my supervisor and to get from him more and more knowledge.
Introduction:My internship was done in Mechatronics company, they are specialized in mechanical and electrical contracting. One of my main goals through this experience was to improve my communication skills specially when working with people from different nationalities and backgrounds. I have aimed to improve my communication skills by not only concentrating on the work that I have been assigned but also work with the team, to improve my team management skills and try to improve my knowledge more and more by sharing ideas and different sets of information with my colleagues. Adding to that, one of the main process of learning and personal growth is leadership development, which is a structural action plan that can improve my personal development and keep me moving forward to reach my goals. In this report I will explain what I have done in my internship in details and provide some figures.
MechaTronics is a sister company of ProService the Egyptian leading electromechanical contractor that had been established in Cairo in 1998 by three people with immense expertise who shared the same vision. Yousef Borhan, Mustafa Elsayed and Sherif Noweir partnered together and started a house for premium-quality electromechanical building services. MechaTronics Contracting is not just about electromechanical installations that are unparalleled in quality; we have a state-of-the-art technical office that competes with, if not beats, technical offices in large consulting companies, which insures, on a professional level, that all work done is as perfect as can be. With its selected range of engineers in every department, ProService and MechaTronics Contracting has youth and experience, with a framework of motivation and team spirit embedding both. MechaTronics Contracting is constantly growing technically and financially, engaging in larger projects every time. Our name is recognized by major consultants and owners whom we gained their trust by building a solid reputation in the business over many years through timely meeting projects deliverables and honest and ethical business practice.
Company contacts: BIN AL-SHEIKH BUILDING
2ND FLOOR, BANKS STREET
PO Box:37269, DOHA, QATAR
Tel: + 974 4464 9172
Fax: + 974 4464 9206
Email: [email protected]/PARTNER
ENG. YOUSEF BORHANEmail : [email protected]: Qatar: + 974 6661 7241
DEPUTY GENERAL MANAGER
ENG. HAYTHAM BORHANEmail: [email protected]: Qatar: + 974 6660 0525
ENGINEERING & PROCUREMANT MANAGER
ENG. KHALED FAWZY Email: [email protected]: Qatar: + 974 5548 9633
Supervisor area of knowledge and expertise:My supervisor the engineer Ahmad Samir. He grew up in Egypt and proceeded to do his bachelor’s degree in the university of Ain shams and graduated in 2007. After finishing his studies, he started working in construction companies in Egypt to gain experience for a higher management job in the future. He has worked in Egypt for four years and then moved to start working in Qatar for Mechatronics company. In his four years here in Doha, he has specialized in HVAC, ducting and firefighting, adding to that, he is also an expert in using a lot of computer programs some of them are; AutoCAD, solid works, shop drawing and Microsoft office. I am aiming to try to gain some experience and notes from my supervisor’s experience in the company, to try to know what to concentrate on and specialize in, in my future job, also my supervisor sent me with another engineer to work with, he is also specialized in the same area of my supervisor, his name is Khaled AL-Akhdar he has graduated from Egypt in 2011.
About our project:
Qatar Rail is overseeing the construction of Qatar’s multi-billion-dollar state-of-the-art integrated rail network. The company will then oversee the management, operation and maintenance of the country’s rail network. Three major projects make up Qatar Rail’s responsibilities: the Doha Metro, the Lusail Tram and the Long-Distance Rail, which will be connected to the wider GCC rail network. The planned national network will unify all railway in Qatar and will be connected to neighboring countries to create the region’s first fully integrated rail system. By combining traditional elements with modern features, these programs will generate the region’s most comfortable, reliable, and safe railway system.
Our project was in Lusail, the Lusail Light Railway Transportation System has been charged by the Qatar Railway organization to give a productive and pleasurable transportation framework for the general population living in, and driving to, Lusail City. The auxiliary works for the passages, subordinate structures and underground stations are nearing finishing and the LRT yellow line is relied upon to go into benefit in January 2019.
The LRT has 3 fundamental working lines. The cable cars are furnished with electrical footing power from either an overhead catenary framework (unbending rail settled to the roof of the passage) or from a third rail amidst the track.
The development of the LRT passages and underground station structures has been attempted all through different stages: The underlying stage 2A contained the unearthing works for the passages started in March 2009 and were finished in August 2010. At that point the second development stage 2B, which began in April 2010 comprised of the strengthened solid passage areas. In October 2011, the third stage was propelled involving the removal and development of the fortified solid underground station boxes. To which the Pearl Interchange station, was included 2013 to be finished in March 2017.
Site information:Here in the site we have twelve buildings, each building assigned for something, building number one is to control the tram, building number three for security, building number five for maintenance, building number eleven for the firefighting system which control the firefighting system for all buildings, and building number twelve is the heat exchanger room. For me I have worked my weeks four and five in building number twelve, doing something called snag list. I will explain what the snag list is and what did I do with it.
Tasks company works on: HVACExtra Low Voltage WorksLow Current Electrical WorksIndoor ; Outdoor LightingFire Alarms SystemLighting SystemPower SystemLight CurrentDrainage SystemsPlumbing SystemSurveillance CamerasMy work:In the first day we have took the safety induction, looked around the site, and learned how many buildings does the site contains, what each building for. For the first three days we have started working in the site, the first building we started in was the building which contains AHU (air handling unit) (figure1), FCU (fan coil unit) (figure2), Dx (direct expansion) and the pumps that distribute the chilled water which called the suction centrifugal pumps. The next three days we have moved to the building which contains the firefighting for all buildings, learned how does the firefighting system works, how many pumps do they use to cover the buildings, and how do they extend the pipes for the buildings without any mistakes, while learning my supervisor gave me the green light to start leading a foreman with his workers, it was something hard for me in the beginning because I was responsible to finish the work in a specific time, were if we didn’t finish at that specific time there will be penalties on the company.
Figure #1 (AHU)
What is the AHU and how does it work:An Air Handling Unit (AHU) is utilized to re-condition and course air as a major aspect of a warming, ventilating and aerating and cooling framework. The essential capacity of the AHU is taking in outside air, re-condition it and supply it as natural air to a building. All fumes air is expelled, which makes an adequate indoor air quality. Contingent upon the required temperature of the re-molded air, the natural air is either warmed by a recuperation unit or warming curl or cooled by a cooling loop.
In structures, where the clean prerequisites for air quality are lower, a portion of the air from the rooms can be re-coursed by means of a blending chamber and this can result in huge vitality investment funds. A blending chamber has dampers for controlling the proportion between the arrival, outside and deplete air.
The AHU is a substantial metal box containing separate ventilators for supply and fumes, warming loop, cooling curl, warming/cooling recuperation framework, air channel racks or chambers, sound attenuators, blending chamber, and dampers. AHUs associate with ventilation work that conveys the molded air through the building and returns it to the AHU.
A warmth/cooling recuperation exchanger is regularly fitted to the AHU for vitality investment funds and expanding limit. An AHU intended for open air utilize, regularly on rooftops, is otherwise called a housetop unit (RTU).
What is the FCU and how does it work:A fan coil unit (FCU) contains a fan which attracts the air a space into the unit at that point blows it over a cooling or warming loop. The air leaves the FCU either cooler or more blazing than previously. They are utilized in some places of business and strip malls and ordinarily indicated where there are numerous little spaces requiring singular control. Ordinarily an individual FCU serves just up to 150m², so there can be tens or even hundreds of a building. FCUs are, be that as it may, most generally utilized as a supplement to a working for which other HVAC frameworks give most of the aerating and cooling.
FCUs will for the most part have a chilled water curl for cooling and either a boiling water loop for warming or an electric warming component. Chilled water is given from a chiller situated in the focal plant, and heated water shape a kettle. Each FCU is furnished with a little supply of outside air to guarantee enough ventilation.
FCU systems are of average efficiency only but if well maintained and operated can produce a good level of efficiency. They are generally not as efficient as standard alternatives such as variable volume air conditioning, chilled beams and displacement systems.
FCUs are found as a secondary HVAC system in most building types but are less common as a primary HVAC system type, except in shopping centers and smaller offices.
Figure #2 (FCU)
Also, I have seen the direct expansion air conditioning, in the coming paragraph I will explain about it.
What is the direct expansion and how it works:
direct expansion air conditioning (DX) framework utilizes a refrigerant vapor extension/pressure (RVEC) cycle to straightforwardly cool the supply air to a possessed space.
DX frameworks (both bundled and split) straightforwardly cools the air provided to the building because the evaporator is in coordinate contact with the supply air,
Development alludes to the treatment of the refrigerant (a valve reduces its weight and temperature) preceding it entering the evaporator. DX frameworks can come furnished with every one of the segments in the unit (bundled framework) expected for establishment on the housetop or by the side of a building; or it might have a few segments introduced inside the building and some outside (split framework). DX frameworks require a ventilation fan to disperse the cool air and resupply/re-circle it.
A RVEC cycle has four basic components; an evaporator, compressor, condenser, and thermal expansion control device. The evaporator (located inside the supply air ductwork) absorbs heat through the process of expanding the refrigerant flowing within it. The refrigerant then flows to a compressor which compresses it causing it to condense in the condenser and release the heat it removed from the supply air. The condensed liquid refrigerant then flows through the thermal expansion control device which controls the flow and pressure of the refrigerant back into the evaporator.
Packaged Systems – Packaged DX units contain all 4 parts of the RVEC system, as well as fans and internal ducting. These units are designed to be installed easily to serve local zones cooling needs; multiple units can be installed to service multiple zones in a building.
Split Systems – These systems generally have the evaporator and fans inside the building, while the rest of the RVEC system components are a separate unit placed outside the building. This allows system designs that are more flexible, allowing performance that can satisfy greater variations on system demands. Split units are made to an incremental performance scale, meaning only certain working load sizes are available.
For the second week I have moved to another building, having the fully responsibility extending the pipes for the AHU, FCU. I have faced so many problems such as how to lead the team to finish the work that should be done on time, looking if the connections between pipes are correct or not, that needs an experience to know if the pipes are in the correct position. For the last two days in the second week the engineer who was responsible for doing the permits has traveled and I was assigned to do his work, which doing the permits were its called CPW (person in charge), that means the workers cannot work anything without me being there, so actually that was a one of the challenging issues I have faced.
Tasks assigned for the last two weeks:HVACFire Alarms SystemSnag list
Learning on AutoCAD
Learning how to read a shop drawing
Learning about pumps
What is the snag list and what I was doing with it:
It is a slang expression widely used in the construction industry to define the process of inspection necessary to compile a list of minor defects or omissions in building works for the contractor to rectify. A snagging list (occasionally referred to as a punch list) is prepared and issued by the appropriate certifying authority, typically this will be the architect, contract administrator or employer’s agent. The faults that are identified should be rectified prior to a certificate of practical completion being issued.
In my daily work, I was assigned to take care of building number twelve which is the heat exchanger room and do the snag list for it. Here I have taken my team and worked in the sang list until now. Below I will explain what I did in the snag list:
After the inspector came to the building and saw what is not completed he has wrote down comments to complete them and the comments that I was working on are:
Installing ducts are not completed:
Here for the ducts any aria where the duct is not installed I was responsible to order the ducts, but before I was responsible to take the size of the ducts and order it from the store.
Incomplete pipe installation:
Also, here I must check the shop drawing where if there is any aria needs a pipe installation I must take the size of the pipe and order from the store.
Sand trap and louvers not installed:
Here the louver should be installed in the end of the exhaust and no sand trap needed, but for the fresh air ducts needs sand trap and louver. Exhaust doesn’t need sand trap because it blows the air to the outside, but for the fresh air is such the air from the outside.
Figure #3 figure #4
Checking the location of the valves:
Here, after the inspector checked the valves there was some mistake on the location of the valve, so we must change the location as the shop drawing says unless there were some changes, then we have to change the drawing for that.
Checking the MSFD damper installation:
motorized Fire and Smoke Dampers. Our Smoke &Fire Dampers (MSFD) are designed to stop the spread of fire through ducts or walls in central air conditioning systems. OPTIMA Fire/Smoke Damper provides an automatic means of localizing area of fire in ventilation system with building management systems as option.
Tagging the ducts:
The is so many usages for the ducts so each duct should be tagged with what is used for, for example, the supply, exhaust, and fresh air ducts should be labeled.
New knowledge:I have learned new things, one of these things is HVAC: HVAC stands for Heating, Ventilating, and Air Conditioning, and HVAC systems are, effectively, everything from your air conditioner at home to the large systems used in industrial complexes and apartment blocks. A good HVAC system aims to provide thermal control and indoor comfort, and one that is designed using the principles of thermodynamics, fluid mechanics, and heat transfer.
The big air conditioner boxes that you might see on top of apartment blocks or offices are examples of (the visible part of) HVAC systems. They’re typically deployed in large industrial buildings, skyscrapers, apartment blocks, and large interior environments. They’re also an essential component of environments where there are health regulations requiring that temperature and humidity be kept at certain levels, using air taken from outside.
But heating and cooling systems you use in your home are also HVAC systems. They may take a different form, but many of the fundamental principles determining how they operate, as well as their efficiency, crosses over from the smallest of personal devices right through to the biggest commercial installations.
Figure #6 (HVAC Cycle)
The second thing I have learned is the firefighting system: A method of fire protection involves the conveyance of water pipes to extinguish fire within a building falls into the field of plumbing. Water may be supplied through riser pipes or standpipes. Classification of Fire: Class A: Ordinary combustibles or fibrous material, such as wood, paper, cloth, rubber, and some plastics. Class B: Flammable or combustible liquids such as gasoline, kerosene, paint, paint thinners and propane. Class C: Energized electrical equipment, such as appliances, switches, panel boxes and power tools. Class D: Certain combustible metals, such as magnesium, titanium, potassium, and sodium. Components of Fire Fighting System: Passive fire protection is an integral component of the three components of structural fire protection and fire safety in a building. PFP attempts to contain fires or slow the spread, through use of fire-resistant walls, floors, and doors (amongst other examples). Active fire protection – is an integral part of fire protection. AFP is characterized by items and/or systems, which require a certain amount of motion and response to work, contrary to passive fire protection. Active Fire Protection: • Alarm System • Smoke Detectors • Heat Detectors • Portable Fire Extinguishers • Fire Hydrants • Fire Hose System • Sprinkler System (Dry Riser, Wet Riser).
For the firefighting we couldn’t work by our hands because we should have a certificate from the civil defense that allow us to work, but we have seen the room where the firefighting system is, and how does it work.
Types of firefighting pumps I sawHorizontal split case (Fig. 7) pumps are the most commonly used type of pump. This is due to their ease of access to all working parts, availability of various sizes, ability to efficiently move large amounts of water, and their long-term dependability. This type of pump requires a water source that provides a positive suction pressure. The functionality of a Vertical split case (Fig. 8) pump is similar to that of a Horizontal split case pump with the exception of the vertical orientation of the pump and motor. The vertical motor placement offers the advantages of less required floor space and the protection of the motor against potential flooding conditions. This type of pump also requires a water source that provides a positive suction pressure.
Vertical in-line (Fig. 9) pumps also have a vertical motor orientation. Generally, these are smaller, compact pumps requiring less space than other pumps. They are suited for applications with limited space for a pump room. Another benefit includes in-line mounting that generally does away with the need for special pads or foundations. A drawback to the in-line pump is that the entire driver unit must be removed to perform maintenance or repairs. A positive suction pressure is required for this type of pump. Unlike the previously discussed fire pumps the Vertical turbine (Fig. 10) pump does not require a water source that provides a positive suction pressure. As such, this type of pump is able to operate without priming. The typical supplies for these pumps are underground tanks or wells. When operating, these pumps force water up through the column pipe to the pump discharge.
Figure #9 figure #10
An End suction (Fig. 11) pump is considered a horizontal pump. NFPA 20 – Standard for the Installation of Stationary Pumps for Fire Protection defines End suction pumps as follows: a single suction pump having its suction nozzle on the opposite side of the casing from the stuffing box and having the face of the suction nozzle perpendicular to the longitudinal axis of the shaft. Similar to the Vertical turbine pump, the water flowing through an End suction pump makes a 90° radial turn from suction to discharge.