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I have enclosed another image that shows the two RTU's with common service corridor for a little more clarification. Thanks.https://files.engineering.com/getfile.aspx?folder=50ed4fff-19e6-4c33-89dc-9943cbfc8c2f&file=Common_corridor.jpg

Hello cdafd, it depends. We have seen them installed as one unit and in other cases they have been installed in sections. It all comes from the rooftop manufacturer though.

Hello all, we are working on a healthcare project that involves numerous large rooftop units equipped with a common service corridor (see the enclosed picture for an example of the RTU and service corridor). These corridors are heated for service in the winter time. Units are accessed by roof...

Hello skdesigner, the domestic pumps are not dedicated to fire pumps. There are a few plumbing fixtures in each building that they serve. It looks like a better design may have been to have 2 piping distributions, one for domestic at 70 psi and one dedicated for fire being maintained at around...

Hello everyone, I hope I can get some input on this question. I am working working with an owner on the review of his fire pump system. The campus has approx. 5 building spread out over the property and has a pump house with a primary electric vertical turbine fire pump and a back-up vertical...

I am hoping that someone might recall an excellent article by Ken Isman (of NFSA), I believe (not 100% sure), regarding estimating sprinkler demand by hand. It is very useful in the beginning of a project to estimate the sprinkler demand in order to determine if a fire pump may be required. I...

317069, the energy savings control sequence is set up so that the hot water temperature is adjusted based on the outdoor air temperature. For instance the supply water temperature varies from 140F .. 180F as the outside temperature varies from 64F .. -30 F. The same heat source (i.e. boiler...

When designing new hydronic systems, we generally have separate heating loops for radiation units (i.e. wall fin, unit heaters, etc.) and reheat coils. I have seen many older buildings where the reheat and radiation are on the same heating loop (i.e. share the same supply and return piping and...

I have a large space that is very similar to a warehouse, but is used for file storage (i.e. insurance company records). The roof height is 22'-0" AFF, with rows of 12'-0" high storage racks. There will be a couple of people that walk up and down the aisles throughout the day to retrive and put...

Good discussion. Thanks for the input.

I've heard that in order to keep your interview skills sharp you should plan to go through a job interview every so often. I have not been through an interview in approx. 6 years and I am thinking of doing this (with the purpose of seeing what other opportunities are out there, as well as seeing...

willard3, I agree with you , however its frustrating when you get 3 completely different answers from 3 different senior engineers.

New to HVAC field and I am wondering if anyone knows where you can get some general information on the type insulation to use on ductwork, i.e. when to use accoustic insulation, flexible versus rigid insulation, insulation on outdoor ductwork versus indoor ductwork, etc. The master spec. that...