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I was able to access the unit yesterday and do some measurements and take photos. There is an additional fire sprinkler in the kitchen. Yes, the ceiling is flat and smooth with no pockets, soffits or clouds. It is a high rise building, so I assume it was designed per NFPA 13. The washer/dryer...

Hi, I'm thinking of adding a full height partition wall to separate the bedroom from the living room in my studio unit. The unit is in a high rise building and I was wondering if the change will require modifications to the fire sprinkler system. Attached is a sketch showing the current...

Has anyone installed a portion of a dry sprinkler system underground? How did you provide auxiliary drains for the underground portion of the system?. I am designing the plumbing, fire protection (performance only) and hvac systems for a new building. And my client has asked me to look into...

Thanks for the replies!. I've been trying to find the pressure requirements for the Pfister and for the Symmons shower/mixing valves but I've had no luck. PEDARRIN2, have you had any luck finding that info online?. Do you know of a manufacturer that has that info available online. Again...

Hi I am working on the design of a science lab building (NFPA 45) which includes several instructional laboratories and a dedicated liquid storage room. The labs will be designed for ordinary hazard II per NFPA 45 (Class C or D, Instructional laboratories) and the amount of...

Hi, Are the recommended flowing pressures in Table 604.3 of the 2012 International Plumbing code still valid for low flow plumbing fixtures. Has anyone run into issues when designing using the values in the code?

Mr. Zoro You can use 3Eplus to calculate the heat loss per linear ft for different pipe and insulation configurations. Its free.

I am designing the drainage systems for a large apartment complex which will have a manual wet standpipe system and a large classroom building which will have a combined manual wet standpipe system / automatic fire sprinkler system. The fire suppression systems wont be designed by my firm (They...

Thanks for the response, LittleInch & PEDARRIN2! I am considering using a booster pump set with 3 pumps sized at 50% capacity (each pump provides a 40 psi pressure boost @100gpm, one pump is redundant). The set comes with Variable Frequency Drives on each pump and a small hydro-pneumatic tank...

Thanks for the response, LittleInch.! The building has 130 units (a mix of 1-bedroom, 2-bedroom and studio units), a commercial kitchen, a spa, a beauty salon and several offices. The peak flow was calculated using Hunter's method (IPC 2012 Appendix E with local amendments): Total number of...

Hi, I am specifying my first water booster pump, and would like to hear how you other engineers determine whether a booster pump is needed and the amount of pressure boost that is needed. My calculations are as follows: Water flow test static pressure: 58psi residual pressure...

Hi, Is there a way of sizing the air compressor for a pre-action system without knowing the layout of the system. I work as a plumbing engineer designing residential buildings and usually the design of the fire protection system is delegated to the contractor. However, I would like to know...

Hi Members, I am trying to calculate the hot water recirculation flow for several balancing valves. I am following the procedures outlined in the ASPE Plumbing Engineering Design Handbook Volume 2, Chapter 6. However, once you have more than one recirculation path the process becomes a little...

Thanks for the replies!. Your answers have cleared my doubts about this. I will take into account how the building is going to be built when preparing future drawings, but it looks like Option 2 is going to be appropriate in most situations.

Thanks for the replies, Upon further reading, I discovered that the faucets that meet ANSI A112.18.1M are already designed to prevent backflow: [link http://villageofalsip.org/Cross%20Connection%20Hazards%20brochure.pdf]Cross Connection Hazard Brochure[/url] PEDARRIN2, would you mind...

Hi everyone, I am an entry level plumbing engineer looking for the opinion of a more experienced mechanical / plumbing engineer on the following: Do kitchen faucets that meet ANSI A112.18.1M have an integral backflow preventer device or do they require an additional backflow preventer device...

Hi Everyone, I recently graduated from college (Mechanical Engineering) and started working as a Plumbing engineer at a small company. I am currently the only plumbing engineer at my office and I would like to hear your suggestions about how to present the different plumbing systems in the...

Thanks for your replies, I ended up using two scuppers for each roof area, one for primary drainage and another one for overflow purposes. The primary drain is connected to the storm sewer and the secondary discharges to the floor surface at ground level. Although civil designed the roof to...

Does anyone have experience designing storm drainage systems using scuppers only? I am designing the storm water drain system for the roof of a two story building (I-2) and our client requested replacing the roof drains by scuppers. We are using the 2012 International Plumbing code and I am...