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The question comes from here. The electric motor has a cooling system based on cooled air. When the cooled air is not provided, the electric motor has to be derated and the components should not be heated above 80 degrees. During the FAT the manufacturer carried out the test without cooled air...

Sorry Tara, you are right but I did not write the question correctly. The at LEAST is the key. I will rewrite the requirement. My specification requires that when the cooling media (air) is 60 degrees the component incresases its temperature ONLY 15 degress. Thanks. Jaime

Hi All. I have a simple question but I am not sure if the answer is that simple. Is it possible to ensure that a component always incresases its temperature regardless the temperature of the cooling media? The question comes from the test of an electronic component. My specification requires...

Thank you very much Cockroach. Jaime

Thanks Cockroach, Could you list any standard where 15 minutes are required? Thanks Jaime

He, he. Thanks for the info. I have found a french standard for the torque: NF E 29-470 Thank you very much Jaime

Hi All. I have a question regarding the number or cycles for a valve during a pressure fatigue test I have in front of me a technical specification where the number of pressurization cycles depending at pressure test (based on the MAWP) are: 68.000 pressure cycles @ 1,5 MAWP 175 pressure...

Hi All. I have a question regarding the maximum speed in pipes for sea water and hydraulic fluids. I have a technical specification for a marine system and it is stated the following values for speed. Nominal Service Velocity: 2 m/s Maximum Service Velocity: 4 m/s Exceptional Service Velocity...

Thank you very much for your help. It is much appreciated. Cheers Jaime

Thanks guys. The valve is a ball valve. The seal is metal. Thank you for your help Jaime

Thank you very much guys. It was a useful answer. Much appreciatted. jaime

Hi All, thank you very much again for your valuable posts. Basically the question is answered, however I would like to support the final discussion with some standard or code regarding the speed to increase and decrease the pressure during the pressure test. From the top of your heads, is there...

Hi All. Could anyone help me with this question? How long should a pressure test last? Is it reassonable that a pressure test lasts 15 minutes? I cannot rememeber what ASME or BS PD5500 say about it and I would like to know if there is any standard that specifies 15 minutes. On the other...

Hi there. I have a question regarding the admissible values for leakage rates during a tightness pressure test. I was given the rates for internal leakages in valves for sea water based on the DN as: DN litres/h 6 0.05 8 0.08 10 0.08 15 0.15 20 0.2 25...

Hi All. I have a question regarding the human maneouvring effort for opening and closing a valve. I have an specification regarding the maximum permissible tangencial force based on the maximum lever and the handwheel diameter. The application of this valve is for sea water in a submarine...

Hi All. I have a question regarding the human maneouvring effort for opening and closing a valve. I have an specification regarding the maximum permissible tangencial force based on the maximum lever and the handwheel diameter. The application of this valve is for sea water in a submarine...

Thanks Micalbrch No worries, this depth is not a sensitive value... it is just an aproximate one. Basically it is the normal depth for most of the submarines in the world. Cheers Jaime

Hi All. Thank you very much for your useful answers. The pressure test is for a valve installed in a submarine. This submarine will see a depth of about 550 m and the valve will be placed in the pressure hull. This valve will be responsible for the inlet and outlet of sea water from the...

Sorry for that. My question is related to the pressurization speed in a pressure test @ 315 bar for a sea water valve. The procedure says that the increase in pressure should be 5 bar per second so from 0 bar to 315 bar it will take 315/5= 63 seconds. I would like to know if this speed to...

Hi there. I am new here and this is my first post. I have received a pressure test procedure and the pressurization and depressurization speed are 5 bar/s and 10 bar/s. I am not sure if these values come from any standard or are the good engineering practices for pressure test speed. Could you...