Metal, Nonmetal, and composite, which is a combination of metal to metal or metal to non-metal. The next difference lies in refrigerant management. Any water in the system would freeze and obstruct piping, so ammonia refrigeration systems must use anhydrous ammonia (without water or other impurities). The refrigeration plants on merchant vessels play a vital part in carrying refrigerated cargo and provisions for the crew on board. NH3 boils at −33.34 °C (−28.012 °F) at a pressure of one atmosphere, Ammonia was commonly used before Freons (chlorofluorocarbons) became popular. D. … The IIAR (International Institute of Ammonia Refrigeration), in conjunction with ANSI, issues guidelines for identification of ammonia lines. Copper, brass, bronze cannot be used with ammonia – your metal choices are mild steels, stainless steels, nickel, but absolutely no copper. Refrigeration Plant Operator Syllabus; Book an Exam. Originally printed in 2000, this publication has gone through several updates throughout the years. Read more. The physics of vapor-compression refrigeration require the system to use enough pressure to compress the gas into a liquid. Why you need this Manual. Practice Test: Question Set - 07 1. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. To pass you must obtain a mark of at least 65%. Strength of Materials Objective Questions with Answers - Set 10. Although liquefied ammonia had been used without significant difficulties for several decades in the refrigeration, chemical and steel heat-treating industries, inexplicable ruptures of ammonia containers in the agricultural service occurred soon after the introduction of ammonia into this service. MCQ in Industrial Plant Design; MCQ in Refrigeration Engineering and its Applications; MCQ in Air Conditioning; Continue Practice Exam Test Questions Part 3 of the Series ⇐ MCQ in Power Plant Engineering Part 2 | ME Board Exam . THE HAZARDS OF AMMONIA 3. The following sources of information on anhydrous ammonia are recommended. as such, the material within this manual may contribute towards those elements that address refrigerant use and handling. It was then utilized in the US in the 1860s for artificial ice production and then the first ammonia refrigeration machines were patented in the 1870s. Piping material broadly classified into three categories. A. As the heat is removed the refrigerant condenses into a liquid. Syllabus Materials. It does not cover domestic or transport refrigeration. Ammonia … NH. A PSM is required when your facility has 10,000 pounds or more of anhydrous ammonia on its property or if you are modifying a smaller system that will put you over the 10,000-pound threshold (for example, if you’re upgrading your refrigeration system and it will exceed 10,000 pounds or if you’re building a new facility that will exceed the 10,000-pound threshold quantity). Ever wonder how your local grocery store keeps all their produce, meats, drinks, and bread fresh by the time it gets distributed for your weekly grocery run? A. Ductile materials B. - Refrigeration Piping Handbook. Materials of construction should be carefully selected, protected where possible and regularly inspected if the presence of corrosive materials or a corrosive environment is anticipated. And the cycle begins all over again. 0.1638 m 3. 101. of compressor required will be (a) same (b) more (c) less (d) more/less depending on rating (e) unpredictable. Hard materials C. Brittle materials D. Low density materials Ans - A 12. 3. Recognize materials used in halocarbon refrigeration systems that are not appropriate for use with ammonia due to material incompatibilities 3. 20 mm C. 24 mm D. 30 mm Ans - C 13. GEA CompaX ; Model: Swept volume flow at 50 Hz / 87 Hz (m³/h) Max. With the COOL-FIT ABS Plus nipple, no peeling of the polyurethane insulation or subsequent insulating on site is required. Syllabus Materials. Aqua ammonia is used as refrigerant in the following type of refrigeration system (a) compression (b) direct (c) indirect (d) absorption (e) none of the above. Cold Block Piping Solutions ; Cold Block Process Units ... GEA RT Select – our selection and configuration program will help you to find the right equipment for your refrigeration and heating plant. The receiver is a storage vessel for a reservoir of liquid refrigerant and holds any excess that’s not in use. The most important physical properties of anhydrous ammonia are: Molecular Symbol . B. A. So, whether you are upgrading your refrigeration system and will exceed 10,000 lbs. Choose the letter of the best answer in each questions. This code prescribes minimum requirements for the design, materials, fabrication, erection, test, and inspection of power and auxiliary service piping systems for electric generation stations, industrial institutional plants, central and district heating plants. How many cubic meters is 100 gallons of liquid? work with systems in a more environmentally-friendly manner, and to get the equipment itself to have a lower impact. Ans: d 60. Anhydrous ammonia is the liquid form of pure ammonia gas, technically water-free, and the substance used universally as an industrial refrigerant. MCQ in Industrial Plant Design; MCQ in Refrigeration Engineering and its Applications ; MCQ in Air Conditioning; Continue Practice Exam Test Questions Part 6 of the Series ⇐ MCQ in Power Plant Engineering Part 5 | ME Board Exam . When the cold liquid refrigerant reaches the evaporator (the interface between the return chilled water and the refrigerant loop) it absorbs the heat from the return water, which occurs because at this point the refrigerant temperature is lower than that of the return water. The advantages of ammonia when compared to R404A are cost, heat transfer coefficient, plant pipes size, behavior in presence of water, leakage detection, environmental compatibility: Cost: The current cost per kilogram anhydrous ammonia for refrigeration systems is several times lower than that of R404A. Because oil used in refrigeration systems is designed to easily mix with the refrigerant, and oil traps are not 100 percent effective, some oil carryover will occur. Differentiate direct-expansion, gravity flooded, and liquid overfeed evaporator arrangements 4. Anhydrous ammonia, as its name suggests, is ammonia kept separate from water. 12 mm B. The piping was uninsulated and was in direct contact with the hanger. refrigeration systems maintained with anhydrous ammonia are, effectively, immune to internal corrosion. Newly Revised! You will be allowed 3 ½ hours to complete the exam. In reefer ships, the temperature of the perishable or temperature sensitive cargo such as food, chemical, or liquefied gas, is controlled by the refrigeration plant of the ship. So it leaves the condenser as a high pressure liquid refrigerant and flows to the receiver. This lowers the normal flammability limit of anhydrous ammonia (16 percent to 25 percent by volume in air) because it is now a mixture of oil and ammonia. Read on to find out how 4. Because of Ammonia’s vaporization properties, it is frequently used as a refrigerant. Now considering both process and the material property you can choose piping material from a verity of material available. C. 0.3785 m 3. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. When thickness of plate is 16 mm, then diameter of rivet is used in joints is... A. There is a publication: Bulletin 114 - Guidelines for: Identification of Ammonia Refrigeration Piping and System Components (Date: 1991) Member Price: $10.00 Non-member Price: $20.00 OF USING ANHYDROUS AMMONIA REFRIGERANT IN THE PROCESS INDUSTRIES Walter S. Kessler, Senior Process Safety Engineer Introduction: Ammonia (azane (1) or R-717) was among the early refrigerants, first used in 1850 in France(2). To pass you must obtain a mark of at least 65%. You will be allowed 1 1/2 hours to complete the exam. Ammonia has been continuously used as a refrigerant since the initial practical use of the vapor-compression refrigeration cycle was developed. In this chart, I have listed different types of material used in process piping to meet various design condition. 3 Introduction The overall theme of this manual is to encourage technicians to . In ammonia refrigeration plants, piping and vessels can be exposed to multiple environments and conditions that result in varying levels of mechanical integrity (MI) risks or failure mechanisms. Production of raw materials Source: Pioneering Green Solutions, GF Piping Systems 2010. To check available dates or to book a Refrigeration Plant Operator exam see the Exam Calendar. 4 The fast, sturdy and efficient joining GF Piping Systems has invested considerably in developing the ideal joining technologies for special appli-cations and materials. The examination consists of one exam paper, with 150 multiple choice questions. NH3 REFRIGERATION. Which of the following joint is permanent types joints ? The examination consists of one exam paper, with 70 multiple choice questions. 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the piping material used in nh3 refrigeration plant is mcq 2021