Thanks. This is in regards to a previous post I made. Either a relief valve or reducing valve is the only thing I can think of. Evidently there are some high pressure surges in the city system.
http://www.eng-tips.com/viewthread.cfm?qid=361483
Is there any reason that you cannot put a pressure reducing valve before a reduced pressure backflow on an incoming fire service? I can't seem to find anything that says you can't.
I have a project that has been completed recently and I'm told there has been water in the mechanical room. Specifics were not given but I'm 99% sure it's from the relief vent on the reduced pressure backflow. The contractor was on site, did some investigating and determined that they need to...
Evidently I suck at using google. [banghead]
@cdafd : My original post wasn't very clear. I meant there are certain municipals in my area that require FM200 to be exhausted.
I can't seem to find the answer to this. Does the use of Novec 1230 require exhaust? My understanding is that inergen does not, FM200 does but all I can seem to find on Novec 1240 is that is has no impact on environment.
Thanks everyone. Our response was basically show us the code or give us written directive from the AHJ to make a change. Plans have already been reviewed/permitted by the AHJ. So now we wait and see. I looked high and low to find a code section but was not able to.
Is there a code that states you cannot run water piping (Domestic or Fire) below a new building slab? I have a unique project where at the last minute, the city decided to change where the service could connect to the city main and it basically forced a design to run below the slab for about 50...
I have a project where a flow test was done. The test hydrant was located on a "Street A" nearest the to the incoming service to the building and the flow hydrant was on "Street B" which runs perpendicular to "Street A".
At the end of the project, the incoming service needed to flip. It went...
I have a project with an Internal Stair (non-egress). It goes from the 1st to 2nd floor. The risers/treads are the only solid surface, it will be open to a water feature below the stair so there is a non-walkable space below the stair. What are the requirements for this? Are sprinklers required...
NFPA 13 states you cannot run Fire Service mains below a building unless precautions are taken. I'm a bit confused at this.
I have a situation where the only water supply is on the opposite side of the building and the only way to get the service into the water service entrance room is from...
This is for an existing high rise building with a fire pump which has pressures in excess of 175 on the lower floors.
The fixed loss would be the loss of which happens from the point of the prv, to the point after the PRV. For example, if you have 200 psi at the prv, the prv is set to 100. You...
This is more of a hydra-calc question but I would also like to hear general answers.
We frequently do high-rise tenant fitup projects and one question came up which I've heard multiple answers to.
There are two standpipes. The floor is looped with a PRV at each outlet from the S.P. The PRV is...
Didn't mean to post yet...
As for the column being against the wall. I guess it's a judgement call. The column is deeper than 24" so no matter what, if I'm less than 24" from the face of the column there will be a dry shadow. I usually put a head on each side in a case like this but It seems...
It does appear that it's 24" max from the column but then in a later paragraph it states sprinklers can be on either side of the obstruction (column) as long as you are within the 7'-6" to centerline of column.
With that, you could be more than 24".
So, the way I understand it is if I don't...
I have a silly questions that has been bugging me.
In situations where there is a 24" wide column located against a wall. Do you still need to follow the 3 times rule. I'm a little confused about the comment that states "The maximum clear distance required shall be 24"
I'm not sure if no...
Yeah I went with under the duct for the similar reason of no place for the heat to collect. I P.E. here mentioned the water sheilds are really intended for rack type systems which makes sense.
Is it possible to put an pendent under and off to the side of a large duct? I would be putting an upright at a higher elevation, dropping the deflector of the pendent just below the bottom of the duct and providing a water shield.
I've done similar things in the past without issues but I'm not...
I am referring to our local building code requirement. It requires a dual feed and in my opinion does not mean two control valves. I've heard it considered that way before which is where my confusion comes from.
From the sounds of it though, you are all in agreement and as long as that one...
If two combination standpipes were interconnected, but there was one floor control valve, that would still mean the floor was supplied by two or more combination risers. Correct?
I'm a little confused at a code that states a high rise shall be served from two or more combination...
