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Thanks for the responses. The building will be un-manned. It will be located in Texas. No fumes will fill the space. Once again, pumps will not impart heat to the space. Thanks!

Hello. I'm working on providing general ventilation to a pump room. The pumps and motors are below and do not impart any heat to the space. The ventilation I'm providing is just general ventilation. I'm looking to provide 5 ACH per rules of thumb for pump rooms. I'm going to use an intake...

I'm checking to see if the test chamber is adequate in case of possible failure.

All the air in the system is suppose to be bled out before testing begins. There's been a few instances where the coupling has been ejected and hit the side of the testing chamber and dented the 3 inch steel plate.

I'm doing an analysis for hydrostatic testing failure modes. I need to know how to estimate the initial velocity of a hose coupling upon failure. I have all the data nessesary of the goemetry of the hose and the pressure at failure. Thank you.

We were hired by the contractor to do the design. They wanted us to see if a 5 ton unit would handle the load. In this case, it does. The space will not much generate humidity. The only humidity that the space will see is from 6 people breathing and the OA we will be bringing in to satisfy...

The contractor wants to use a conventional DX split. That's why we're going in that direction. I'm specifying a Honeywell 8321 Thermostat. It has control of AC for dehumidification cycles and reheat. We have a wide range for the humidity, so it will be easy to curb if it gets out of hand...

Yes, the maximum humidity that cannot be exceeded is 55%. If I do a load analysis on the space and enter the target setpoint and humidity, then as long as I select a DX split that meets the sensible and latent loads, I should be ok. With regards to bringing the humidity down to acceptable...

Someone said that as long as I specify a thermostat that has a dehumidification cycle built in, it will work. The heating coil will be for re-heat of the sub-cooled air. Does that make sense?

I'm trying to control humidity in a space using a conventional 5 ton DX split system. The system will have an electric heating coil and a wall mounted thermostat. My question is, will dehumidification be possible? Do they make a thermostat that has a dehumidification cycle built in?

I think I have that old chart. That's what I usually use, unless the manufacturer recommends something different. Your best approach would be to use some kind of chart to size up your lines.

Thanks everyone for the input. I like your response DRWeig. This really helps out. Thanks again!

I know I stated earlier that the load will remain constant, but after clarification, the load can vary to some degree. I figured one unit sized at 75% the total load should operate the lion's share of the time throughout the year. I'm sure if I specify units that utilize 2 stage cooling, it...

Ok, well the client said they usually have 50-60 redundancy with thier HVAC equipment. How should I take that? Put in 2 systems at 75%? Three at 50% total load each? If this is what you heard from a client what how would you approach it?... Btw, if one system goes down and one is satisfying...

The load is from VFD's and should remain constant 24/7.

I have a scenario where the client wants 50% redundancy using 2 constant volume units. This means I have 2 units each sized for 75% of the TOTAL load. My question is what airflow do I use for sizing the duct? There will be a common duct and I will use a horizontal mounted back draft damper on...

I just read Section 402.2 of the IMC and that states that the minimum openable area to the outdoors shall be at least 4 percent of the floor area. There is one large double door that would satisfy the minimum 4 percent area requirement, so no ventilation is nessesary. Thanks for the input!

I have a space that houses electrical switchgear. I'm planning on specifying a conventional split system to do the job. I'm wondering if I need to bring in OA by way of a duct (this would increase the cost of the total system). Section 401.3 of IMC 2009 states that ventilation is required...

I used a Ductilator to arrive at the numbers for the pressure drop per 100 feet and the velocity. You can use a manual one or an electronic ductilator. For the duct length, I used the length you gave us and multiplied it by 1.5 (to account for any elbow, turn, etc...). Now keep in mind this...

Thanks for the input everyone.