Pump rooms/non-occupied rooms can get away without OA. Once the door is opened, there is your ACH. If it's a large enough room, it can be prop'd open. I did a similar room, but it was for elevator equipment instead of pumps. Run your calcs for the extreme hot. If you are still below 104 ...
PTC is implementing features with each release of MC Prime. I agree that, for now, MathCAD 15 is the way to go. For those that are knocking 15 and swearing by 14 ...
Check your release. M035 is the last MC 14 but had a HUGE memory bug which I reported. MC 15 was their "bug fix" Kind of like...
Laugh all you want. It is a true story and currently being constructed for an underground light rail station where the AHJ criteria was
Believe me, doing the calc was a pain and an even bigger pain was to set up the controls!
It is an "insulation" style calculation ([link Pipe Insulation]http://www.raeng.org.uk/education/diploma/maths/pdf/exemplars_engineering/2_SteamPipe.pdf[/url]). Once you know the layer temperatures, you need to apply the glycol mixture specific heat to get a temperature rise. Basic thermodynamics
ChasBean1, ASHRAE, NFPA, IBC, etc ... they ALL reference a pressure and testing with the doors CLOSED. As an engineer, we follow these standards. In my case, the AHJ MANDATED an open door test. They didn't care what the standard was. Remember, all of the standards are guides and are not...
I recommend you follow the ISA IA standard for drying air. It is set at 19F below ambient for the dew point. You have not defined the conditions of the air, even if it's plant. If it is not dry enough and there are not enough drip legs with blow downs. I have seen SCH 40 piping in mining...
Compressed air has several options. You may want to look at Aluminum prepacked systems. If not, what about sch 80 CS? With air being dry (assuming a low dew point), it should not be a problem. I've worked on SCH 80 CS steam systems. Old ISA instrument air required -40d dew point ... so very...
I've seen it both ways. Typically, as the engineer, I just but B31.1. Div 1 usually states something to the effect of " the latest version at time of contract signature." Be warry though. On a nuclear project, I had B31.1 or section VIII change from 50% margin to 20% (over 10 yrs ago). A...
Lower the temperature! This will bring the humidity ratio up. You mentioned some areas @ 68 while others were at 75 and a aet point of 72! Check the calibration on the T-Stats or lock them out. People will complain, but the placebo effect (people thinking they are controlling the T-Stat)...
I agree with Pumpsonly. mirghaffari needs to specify the fluid. I always go back to TDH/Flow of H2O and put a NOTE on the bottom as to the actual fluid.
Does anyone have a "quick sheet"/synopsis comparing B31.1, B31.3 and B31.9? I'm liiking for something like: http://www.engineeringtoolbox.com/asme-b31-9-working-pressure-d_10.html
Working on wastewater treatment and EVERYTHING is specified B31.1. Contractor is pushing B31.9. As a plant, we...
Attachment not working :(
Did the specification did not call for a "blocked in seat"?
I've been in a situation where the losing contractor had a way of badmouthing the winning bid.
In short, if the specifications call for the blocked in seal, you can request new valves since the supplied...
An electrical may be better at explaining this, but here is how I learned it:
As mentioned above, most motors operate at class B insulation and have class F. The SF "forces" the manufacturer to "add a little more" of the class F insulation into the motor. This allows a motor, with an SF, to...
cvg and bimr,
I was tasked with estimating water supply for a mid-rise, no FP, that was a differned tap. My calculations showed a 14" line, was able to "justify" a 12" in my estimates. The main was 12". I was told that the city water mains are allowed to go to higher velocities since they are...
