Recent content by longz

Hi Chestermiller, Thank for advices, you are correct. I changed the value of the viscosity and the software output similar to mine calc. To pressure drop of inner pipe support ring, could you please advise some instructions ? I considering this is multi-hole orifices plate but the point is the...

Hi Chestermiller, I found a online calculator exactly same to this matter but the result is quite different in Reynold number (509853 versus with 4988 as mine calc.) caused me confusing, can you please have a look and advise the reason? below is the link of software and information...

Hi Chestermiller, I made a study and draft a calculation to pressure drop but I not sure it is correct 100% or not, can you please have a check and correct me if i was wrong something. thank

I really sorry as I can't get this book, can you advise the specific mathematic formula ?

I have no idea, can you provide some instructions ? thank

Hi Chestermiller, I need to determine the pressure drop to the air. Thank

Hi every body, I need help to calculate the pressure drop to double wall pipe with information as below, i understand need calculate pressure loss to the straight pipe, elbows and supports but I don't know exactly how. - Fluid : air - Double wall pipe (stainless steel) with outer pipe...

Thank Malemk for your advises. The ducting system has just updated with an equipment installed at the outlet of the fan with back pressure 40 mBar !. the fan now come to quite huge . I come up with an solution use available compressed air to push the cover open and the fan just blow air out...

Thank Nidum, the balanced door look not suitable to this case as the hinge axis is horizonal not vertical as door. I'm thinking a counterweight on the cover may works.

Hi Baluncore, Thank a lot for your guides. I have some queries about your calc., Sin( 15° ) or Sin( 20° ) is correct ? the duct mouth chamfer 5° therefore cover open with an angle 20° to vertical axis. The result 63.8354 Pa is static or dynamic pressure ? if this is dynamic so how to find the...

Hi all great PF members, Can anyone help me to sizing fan static pressure strong enough to open a metal cover an angle 15 degree at the end of the duct (20m in length with few 90 degree bends), I'm really not good at math so any help are greatly appreciated. Please refer to sketch attached for...