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Consumables
Published in Carl Bozzuto, Boiler Operator's Handbook, 2021
Almost all fuel oil pumps are positive displacement pumps. Gear types and screw types for the most part, they are capable of raising the pressure of the oil considerably in order to deliver it to the burners at a pressure high enough for proper atomization. Since it is a positive displacement pump, it will deliver a relatively constant quantity of oil. The oil that is not burned is returned, sometimes to the pump suction, and other times to the fuel oil day tank or storage tank. To maintain pump discharge pressure and control the flow of oil to the tanks requires a relief valve, either pump mounted or piped onto the pump set. A relief valve is used, not a safety valve. Even when more precise pressure control is provided, there will normally be relief valves at the pump set.
Consumables
Published in Kenneth E. Heselton, Boiler Operator’s Handbook, 2020
Almost all fuel oil pumps are positive displacement pumps. Gear types and screw types for the most part, they’re capable of raising the pressure of the oil considerably so it can be delivered to the burners at a pressure high enough for proper atomization. Since it’s a positive displacement pump it’ll deliver a relatively constant quantity of oil. The oil you don’t burn is returned, sometimes to the pump suction, others to the fuel oil day tank or storage tank. To maintain pump discharge pressure and control the flow of oil to the tanks requires a relief valve, either pump mounted or piped onto the pump set. A relief valve, not a safety valve. Even when more precise pressure control is provided you normally have relief valves at the pump set.
Natural Gas Hydrate
Published in Mavis Sika Okyere, Mitigation of Gas Pipeline Integrity Problems, 2020
The hydrate crystals forming on pipe walls initiate any unevenness such as weld seams or areas of corrosion. Narrowing of the internal pipe diameter starts slowly, but as flow and pressure conditions change, hydrate build-up is accelerated. Natural gas hydrate (NGH) will easily form at: ElbowWeld seamsAreas of corrosionAt the downstream of the valve where is a big pressure dropRelief valve and the safety valve of the high-pressure vesselPig launcher and pig receiver
Computational fluid dynamics analysis and extended adaptive hybrid functions model-based design optimization of an explosion-proof safety valve
Published in Engineering Applications of Computational Fluid Mechanics, 2022
Chaoyong Zong, Qingye Li, Kunpeng Li, Xueguan Song, Dianjing Chen, Xiaofeng Li, Xuebin Wang
The pressure vessel subsystem is the power source of the explosion-proof safety valve, and it can be set as the boundary condition of CFD simulations. To correspond with CFD simulations, the pressure condition of the pressure vessel subsystem is defined as follows: where P and are the vessel pressure of the current and the previous timestep, respectively; v is the rate of pressure rise due to the explosion; is the size of the timestep; is the mass flow rate at the location of the valve inlet; R is the gas constant; T is the temperature; V is the volume of the pressure vessel; M is the molar mass of the air, and is the duration of the explosion.
Comparison of Triggered Explosion Behavior by Corium Injection Modes in TROI Facility
Published in Nuclear Technology, 2020
Seong-Wan Hong, Sang Ho Kim, Rae-Joon Park
The pressures in the furnace and pressure vessels were also measured during the test period. There were several holes in the connection body with an intermediate catcher to equalize the pressure between the furnace vessel and pressure vessel. There was no safety valve between the furnace vessel and pressure vessel in the TS-4 test. The pressure of the furnace vessel first was increased by releasing the hot melt from the crucible to the intermediate catcher. Then the pressure in the pressure vessel and furnace vessel was increased by steam generation after the melt-water contact. In the TS-4 test, as shown in Fig. 6, the maximum pressure reached 0.278 MPa at 2.60 s after opening the valve of the intermediate catcher, and the total pressure increase was 0.073 MPa.
Municipal Solid Waste Leachates Destruction and Metals Recovery by Supercritical Water Oxidation
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2018
D. A. Zou, Y. Chi, J. Dong, F. Wang, M. J. Ni
An autoclave was employed for the SCWO treatments. The batch reactor is made of Haselloy C276 alloy with a 500-mL inner volume, designed maximum temperature and pressure of 550°C and 35 Mpa (Parr Instrument Company, Illinois, USA), as is shown in Figure 1 (1. Gas collector; 2. Liquid collector; 3. Rotameter; 4. Gas–liquid separator; 5. Condenser; 6. Hydrogen peroxide tank; 7. Oxygen cylinder; 8. Nitrogen cylinder; 9. Booster pump; 10. Mass flow meter; 11. High pressure metering pump; 12. Thermal couple; 13. Motor; 14. Pressure sensor; 15. Safety valve; 16. Reactor; 17. Heating furnace; 18. PC controller; 19. Agitator; 20. Cooling coil).