I have a 6000 foot above grade crossing for a new water line on a steel bridge. Due to tight constraints and aesthetics we are using bellows type joints. The pipe is 8 inches in diameter and is at 150 psi. I am wondering what the anchor forces will be if I have 2,000 feet between anchors with...
I have a 1,000 SF electrical room, with some transformers, panelboards, etc that is a free standing building. All four sides and the roof are exterior. I have close to 40,000 btuh of heat load due to internal equipment but my question is if I want to keep the room below 104F with an ambient of...
I posted this in the pipes forum and they directed me here..
It I have a compressed air continuous plant demand of 15,000 scfm at 30 psig, can I serve this with an IR compressor rated for 3,000 cfm free air delivery at 150 psig with a pressure regulator to 30 psig? I am confused as to what the...
Can I have a constant speed DOAS system serving 10 air handlers that have variable frequency drives? Will the outdoor airflow rate remain the same throughout all operating points of the air handler fan? I'm assuming it won't since the pressure in the mixing box will change and I would need...
I have a pumped stormwater forcemain that discharges into a pond via a 4 inch pipe above the pond water level. The discharge velocity is so powerful that it shoots the water about 10 feet at a fairly high pressure and has started to erode the pond bottom. I have been tasked with fixing this...
I received hydrant flow test results and they are as follows: 92 psi static, 90 psi residual and 750gpm. Will I be able to flow a pump at 1250 gpm off of this main without going under the 20 psi residual requirement? Is there a formula or graph to plot the data on?
I am working on a water source heat pump installation with a boiler and closed circuit tower. I want to isolate the tower from the building heat pump loop via a plate heat exchanger, so that glycol only has to be in the tower loop outside, and not the entire building loop. My question is if my...
I have a 6,000 foot bridge that is 300 feet above grade. I have been tasked with specifying the dry pipe fire standpipe system on this bridge. An acutal fire engineering firm will do the design build of the system but I want to make sure I am specifying it correctly. Can anyone shed some...
I have a 6,000 foot bridge that is 300 feet above grade. I have been tasked with specifying the dry pipe fire standpipe system on this bridge. An acutal fire engineering firm will do the design build of the system but I want to make sure I am specifying it correctly. Can anyone shed some...
I am reviewing a design with a primary building hot water loop serving air handlers and vav's with a total hot water flow rate of 200 gpm on the design day. The equipment is designed for 180F entering water temperature and 160 leaving. The design has two condensing boilers that can run in...
I have a question for everyone regarding standpipes on bridges. I would appreciate all opinions and comments as I am new to NFPA 502. The bridge in question is 300 feet above grade at its highest point and over 1.5 miles long. The bridge is in an area prone to very cold winters and freezing...
I'm looking for a good recommendation for minimum cooling airflow cfm/sf for several common areas in office buildings, specifically interior corridors, storage rooms, office rooms. I ran the load calc but interior corridors and storage rooms are coming out to be like .24 cfm/sf which seems...
I have a 25,000 SF office building with a large restroom. I am locally exhausting it at 10ac about 500 cfm, but am confused as to whether or not I have to make that 10ac (500cfm) up with outside air ventilation through the main air handler coil. It is a VAV w/ reheat application. The bathroom...
Have you ever heard of horizontal heads not being within a wall cavity? We have a historic building where the client is requesting we do not install any piping in the walls. They also do not want the upright pendants in the middle of the ceiling, so they are requesting sidewall heads on...
IBC and NYC Building code require the outside air intake and exhaust air intakes to be at least 10 feet above the ground. Why is this? I see all the time louvers/intakes that are right above the door jam, i.e 8 feet. I have a mechanical room that is in the first floor of the building, and I...
So I have a building, built in 1940 with 8 inch concrete walls and no insulation that is being converted to an office building. I have run the load calc using trace 700 and the cfm has come out with 11,000cfm for 7,000 sf of space, summer design is 93F. The walls are 75% windows double pane...
I am sizing hot water circulating pumps for a 3 story building for a vav w/ reheat system. My question is do I take into account the static head required to pump to the highest hw coil in a VAV box on the 3rd story (pumps in the basement), or do I just take into account the pipe friction losses...
I'm hoping someone can direct me to the right answer. I've checked the users manual and there are no other ME's in the office to ask. I am using Trane Trace 700 and the outputs for airflow cfm's per room are always some odd number 93, 243, 432, etc. Is there a way for the program to round to...
I have an auditorium with 20 foot ceilings and exterior walls. I can run the ductwork in the walls and have the supply and return diffusers located in the walls. Should I model the room as only having 10 foot walls, approximate occupied area, or should I model the full 20 foot walls and place...
I have a room that calls for a 100% OA heating only system. The room is 20 x 20 and i'll be sending in 10 AC. My question is do I take the building envelope heat losses into the calculation or do I just calculate the BTU needed to bring the OA temperature up to say 90 degrees and that will be...
