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Further to your other replies, an Engineer can estimate in a long run of pipeline (ie distribution networks) by adding 10% to the measured length, due to the long lengths and minimal fittings. However for pipework which in small lengths could have numerous fittings and therefore a range of 50 -...

HEPA filter type 2s are guaranteed to filter up to 500DegC for 10mins. Has anybody determined the DF at this temp as most manufacturers' data is only for 100DegC or do not state the DF ie the filter media's holes enlarge, hence the DF drops, although some particles would also increase in size...

Is it possible to put another filter in parallel, hence accommodating your flow, keeping similar pressure drop and also keeping within your DF range

Does anybody know where i can get hold of Impulse shock test data on HEPA filters. Most manaufacturers have data on static presssure tests only.

From the 4 replies you can see my dilema. Concrete of about 1.5m thk, estimate 40 N. Prior to testing etc, just a formula to get me started to give a handle on the outcome. The information onb the initial thread is all I have to work with, ie lots of assumptions which is always the case in...

Does anybody out there know how to determine the impact on concrete from primary fragments, travelling at approx 2-3km/s? Or a change of formulae to help.

You could use the formula - Head = Lambda LV squared over 2 gd Or dig deeper and determine the dynamic and kinemtic viscosity to calculate the Reynolds number enabling you to determine the type of flow either lminar or turbulant which will lead to your flow rate. I agree their are always so...

And if so what value to enter, or where to look for acceptable values rather than judgement

Many thanks. The cleaning is of importance as I must also contain the shock, the quasistatic pressure, but must be re-usable after a cleaning regime of waste gases has occurred. Blast baffles have been considered although again reliability, how much sooting occurs. Further to all this what...

Many thanks. I will try this. But remember the question rom the software is K? and static pressure? before the pipesizing has been achieved. Once I have pipesized, I will then have to size my control valves for AHUs cooler coils.

At present looking to employ blast dampers to protect ductwork and HEPA filters. However trying to substantiate the blast valves is concerning. What other options are there, or how to substantiate the valves? Any case data on non operation would be useful ie after how many firings? My client...

I am currently trying to use Hevacomp for general pipesizing. My client prefers the output. Manually I have a clear approach but tedious. When using the software it requests for a K value, fairly ok with this, dimensionless and there are lists from manufacturers. It also requires an acceptable...