1) What is the proper way to determine whether a dry-pipe or wet-pipe system should be used? I have looked at design winter dry bulb temperatures, and it seems that most cities in California have a winter dry bulb temperature at or below 32°F and record low temperatures even lower.
Winter...
In areas that don't really freeze (2-3 days out of the year where temperature might drop to 25 deg F), is it possible to use some dry sprinkler heads in a wet-pipe sprinkler system, such as in attic (insulation at ceiling) or under overhangs?
Thanks.
Does anyone know what a typical vapor pressure at the outlet of a 500-1000 gallon propane storage tank is....after it has been regulated down? I assume that the propane tank has a pressure regulator on it. I have a 1000-gallon propane tank on site that will feed 3 buildings. Each building...
Hi,
I'm looking for the type of prime coat and top coat for painting an above ground exterior black steel used for natural gas or propane. I have used alkyd anticorrosive metal primer and alkyd enamel before, but was told that I cannot use alkyd anymore because the product is not low VOC...
Hi,
Anyone familiar with or have used the Hi-Fog fire sprinkler system by Marioff? I'm not sure if the system is UL listed or approved by the State Fire Marshal. Wanted to see the advantages/disadvantages of the system.
Hi,
What is a typical pressure loss through a fire sprinkler system for a single story office building (4000 sf) with about 200 feet of piping? We have been doing a deferred approval so that a sprinkler contractor will design the system and get approvals, so I do not know how much loss through...
Hi,
I'm trying to select a packaged diesel fire pump to provide flow to a hydrant on a site. The facility is connected to the city's fire water line, but does not have enough pressure. If a fire hydrant is required to have 1500 gpm at 20 psig, does one select a pump for 1000 gpm or 1500 gpm...
Not sure if this question is posted in the right place. Does anyone know if trench drains that are installed inside a building (auto repair shops) require p-traps and vents? This is drained to a sand/oil interceptor located outside the building. I figured the sand/oil interceptor acts like a...
Hi - I'm looking to put a 250-gal waste oil tank and a 250-gal waste antifreeze tank for an autoshop. Can someone suggest a manufacturer? This will be aboveground outdoor installation. Should a single wall or double wall tank be used in this case?
I'm thinking of putting a small container...
Hi all,
Has anyone done a combined hydronic space heating and domestic hot water piping? I have a boiler that will provide heating to my VAV boxes while running its hot water through a heat exchanger for domestic hot water. I am having a hard time coming up with a schematic diagram that will...
Hi all,
I'm designing a project that requires fire sprinklers in the building. Since we don't have a specialist in fire sprinkler, I'm just going to do a performance specifications for the fire sprinkler system and have the contractor design/build the fire sprinkler system. The plans and...
Our winter design condition is 20 degrees F. Does anybody make a concealed non-freeze wall hydrant? J.R. Smith has a non-freeze wall hydrant, but the water pipe is not concealed inside the wall. The pipe is sticking into the room and doesn't look too good. I guess it's probably the only way...
Can anyone recommend a good program to model a water distribution system? We are using an old version of Pipe-Flo. This old version is really not easy to input, especially when we have a big site with lots of nodes.
Does anyone know where I can find the requirements/codes regarding putting a couple of high pressure (water/steam) engine washers in an autoshop? What would the autoshop need to have in order to accomodate these engine washers?... special drainage system?
Thanks in advance.
Does anyone know if it's a good idea to run polyethylene or plastic gas pipe from under ground and rise above ground to a plug valve before entering a building?
NFPA 3.1.7 says that plastic pipe shall be installed outside and under ground only.... with 2 exceptions:
1. Plastic pipe shall be...
