Just review what you learned was required to condense a vapor back to a liquid.....I'm sure you recall it from school.
What you learned then was that to recondense the vapor you had pressurize it and cool it....Then, at a certain pressure and temp it would condense. I bet you also learned that...
Txiceman,
I agree except in this case the pressure DECREASES as the vessel warms up and expands....Then it increases as it cools and shrinks.
I'm thinking he's evacuated about as far as he can reach...Now he needs to see if he's tight.
Maybe the pumps actually do keep up with the change and your system is tight. Let's find out if they do.
The best way to find out is to pin down what at first seems to be a moving target....How do you do that?...You graph it.
Grab some large format graph paper and plot out the trends. That...
rmsaj,
Inspection cycles develop from historical experience with each object.
Shutdowns are then scheduled where their periodicity is dictated by the shortest-lived object....And yeah, each shutdown is limited in scope where not all objects/systems are inspected each time, but eventually based...
GenB sez,
"Internals on new Code Equipment/PV?blrs is rarely done,
Rarely (on Jurisdictional areas), PV/Blr inspectors questions another Commissioned Inspector 'AI' other than surface Code violations,
but every one has the right to opinions,
genb"
GenB, I survived 20 years inside a series...
TallCotton,
I am very familar with the noise you just described, now that you described it...I listen to it daily each winter.
Only my #2 chiller sounds like that tho, and it is fersure not caused by surging...It, like yours, is a York high capacity open drive...It has been operating...
P.S.
Now that you see what is realy happening, I would do the final evacuation at night when the unit is coldest and the internal pressure highest so the pump doesn't have to work as hard.
Sorry Gents,
Sometimes when we chase our tails we get confused, right?
I'll offer this answer, and the odds are you will agree after considering it.
You are confused because increasing temps should cause a decrease in pressure and vice versa. And because you are concerned about your ability...
rmsaj sez,
"Somehow, I firmly have reservations in inspecting newly coded vessels less than 3-4 yrs.
Like I said, you get what you inspect, not what you expect.
As a B&PV inspector, I always do a complete internal and external of any newly installed object before initial operation...I want to...
You nailed the overheating problem when you revealed that you operate the boiler at less than half it's designed MAWP. Your boiler actually fires harder and longer because of it....Sounds to me like the boiler was sized correctly for the process requirements and expected load, but he shot...
Apparently you are running a low temp chilled water system where you have reduced AH/fan capacity and also low capacity CW distribution....The idea of that type system is to reduce the energy required to circ 44 degree water...
The theory is lower supply temps of 36-38 degrees require smaller CW...
It doesn't take much to reach 5K when it comes to hiring boiler repairs, especially when you consider it involves tube replacement and repairing cracks.
Repeat cracks and tube leaks make me concerned with the conditions of your watersides....I suspect that your boiler is overfiring due to scale...
The old saying goes, "We get what we inspect, not what we expect."...So if we are smart, we inspect every chance we get...Especially items deemed critical to the process.
That said, regardless of jurisdictional/insurance requirements, do like the other guy suggested and inspect when possible...
Is this a low pressure chiller?
If so first check for low charge and if you have air in the chiller....If so, investigate the purge unit for proper operation....A faulty purge unit can cause both.
Your low evap temp has me concerned. Please post some more readings. Include chilled water supply...
Go to peavey.com
Then enter their support forum section...They have a forum dedicated to church audio....They offer several pro level mixers that are ideal for your application.
Consider upgrading to a mixer with built-in feed back detection and prevention....Go to www.Peavey.com.
They manufacture auto mixers that incorporate anti feed back protection.
Go to www.peavey.com
Then under support, select forums. From there select church sound forum. Those guys are very helpful and will help you select the proper gear....Peavey brand or not, it's all the same science.
Ok, the first thing you do is determine what SPL's you want to be able to...
DRWeig and friartuck are both correct,
As to any code requirements, you should check with your local jurisdiction. ASHRAE 15-2001 does not prohibit it, local/state code might.
Most federal agency instructions do prohibit it when designing themself a new chiller/boiler plant....Same for some...
ChasBean1,
Your question doesn't make you a Devil's advocate unless you are implying the new ASHRAE requirements are excessive and not achievable. But even then, it is still related to the discussion.
The whole idea of louvers AND fans as far as the ASRAE Standard is concerned, is to provide...
Sorry, but in my last reply I was short too on time to include any refs.
Here is an condensed version of what the latest ASHRAE Sandard 15 changes include: (in brackets [], with more of my comments following)
[Safety requirements of newest ANSI/ASHRAE Standard 15-2001.
BACKGROUND:
ASHRAE 15...
