Hi,
I am planning to run some plastic piping to recycle storm water into our cooling tower (max pump pressure 120kPag). There is little cover in this area so the pipe will get sunlight for most of the day. I was wondering if anyone could advice about how well different products perform in...
We've been getting frequent blockages in our solids conveying eductor. It seems like the odd large particle is getting stuck in the venturi throat. What would the effect of increasing the venturi throat diameter (by about 20%) given the same motive gas nozzle size and pressure, and suction gas...
Hi,
I looking at plan 53 for providing buffer fluid to a pump seal. One option for circulation of the buffer fluid is using a pumping ring. Could someone please tell me what a pumping ring is and how it works.
Thanks,
MarkkraM
I was wondering if someone could help me with the problem of steam hammering that occurs when we bring on tempered water to cool certain zones on our extruder.
Background:
While the extruder is not running, we introduce steam to these area's in order to keep them hot enough so residual...
The pump curve for a centrifugal type pump gives a minimum required flow of 0.9 m3/hr using water as the test fluid. The fluid that I'm pumping has a specific gravity of 0.667, so does that mean my minimum required flow would be 600 kg/hr (0.9 m3/hr x 667 kg/m3) or do I need to maintain the mass...
I was wondering what a typical dew point people use for their insturment air? Do most plants go to the trouble (as we have) to use desicant dryers or do most simply use condensing type dryers?
My plant had dryers to bring the air down to -60degC.
We managed to stuff them up during our shutdown...
When checking my orifice calculation method (after reading denniskb's thread) I came across a statement saying that choked/critical flow does not occur accross thin, sharp edged, orifice plates. For chocking to occur the thickness of the orifice plate must exceed the orifice diameter.
Is this...
Due to the cost and reliability of using spring packs on some particular valves I'm looking at changing to double acting air actuators.
The valves have a required fail position. This then leads to the valves needing a reservoir of instrument air to ensure they can move to the fail position if...
1. Does fire need to be considered a contingency for pressure relief if the vessel is gas only since failure of the shell from overheating would occur even if a PR valve were provided?
2. If there are no over pressure contingencies, do codes really ask for a relief device? If they do, how do...
Vessel design is based on worst case combination of pressure and temperature. If a scenario exists that potentially provides higher than design pressures, typically a relief device such as a PSV or bursting disk is provided. Provision/sizing/installation of these devices are well established in...
When sizing an orifice for a pressure relief valve based on external fire and liquid storage, what temperature should be used? Is there a standard figure for all external fire cases? Should it be the boiling point of the liquid or can this be superheated by the fire?
The temperature at the...
Does anyone have design guidlines for preventing oxygen ingress of an atmospheric (low pressure) vessel using a continuous nitrogen purge. eg Is there a minimum purge rate or velocity through pipe that vents to atmosphere to prevent ingress of air?
