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  1. Cool SH

    Relief Unloading Valve and Pulsation Damper in Hydraulic System

    I don't have any oil cooler for this system. I never thought of the cavitation problem until you brought this up. Thanks for the comment. I will check the system once i go to site again, which is next month. :) As of now I will try to study the system through theory and PID
  2. Cool SH

    Relief Unloading Valve and Pulsation Damper in Hydraulic System

    I have a hydraulic system with manifold and cartridge valves. Oil is leaking for the manifold. When inspect, found that some o ring is damage. The temperature of hydraulic oil is high enough, that cause the damage of the o ring. High pressure in system will increase the temperature. I don't...
  3. Cool SH

    Relief Unloading Valve and Pulsation Damper in Hydraulic System

    Sorry for the late reply. I live in SEA. Please refer to the sketch. Yes. The volume of dampener is greater than 1 liter. Only gas is leaking at dampener. By right the time taken to reach operating pressure is more, but that is in the range of a few seconds. No oil is added to the reservoir...
  4. Cool SH

    Relief Unloading Valve and Pulsation Damper in Hydraulic System

    Refer to the photo. Unloading valve set pressure = 130 bar Pulsation damper pre-charge N2 pressure = 50 bar Pulsation damper nominal liquid volume = 1 liter Consider the following scenario. Pulsation damper gas valve is leaking gas. As liquid is incompressible, in order to reach 130 bar...
  5. Cool SH

    Anyone know what this equation represent?

    I came across an excel sheet, which can calculate the tube exit surface temperature in fire tube boiler. E = exp (Surface area*U/Flue gas weight*Cp) Where, U = Overall heat transfer coefficient Cp = Specific heat at constant pressure Tube gas exit temperature = [(FEGT - Tsat)/E] + Tsat...
  6. Cool SH

    Fire Tube Boiler: Spiral Retarders in tube analysis

    Dear All, I am having trouble to finding the heat transfer coefficient of spiral retarders. The sketch of the tube is shown in the link. [highlight #FCE94F]My objective is the find the heat transfer coefficient for the spiral retarders[/highlight]. With retarders, a turbulent flow will be...
  7. Cool SH

    Tube gas exit temperature in fire tube?

    Chicopee, what you mentioned about the efficiency is near to what I had calculated; 83%. So far I had done the excel sheet. I am stuck at here. Actually part of the reason why I take up this challenge is to understand better the mechanisms behind the boiler. The process is more important than...
  8. Cool SH

    Tube gas exit temperature in fire tube?

    Thank you for your time. It was weekend, so I didn't reply. Just finished Avengers Infinity War, greatest movie of 2018. Anyway back to the question, just to answer chicopee, this is a reverse flame fire tube boiler. I think i didn't sketch the overall of the system. You can check it out in...
  9. Cool SH

    Tube gas exit temperature in fire tube?

    Hello ladies and gentlemen, My objective is to find the tube exit gas temperature in fire tube boiler. I know the rate of heat transfer, Q=m.c.delta T, should be equal between gas and water side. Anyway, I have work out the analysis as attached. However, I just cannot seem to get the final...

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