I've been installing RPZ devices on antifreeze loops for years and I understand the principles of cross connection prevention. We service a "problem child" system that has an antifreeze system above the ceiling in a lobby of high traffic business. The RPZ is just inches above the grid and there...
Situation- An existing (circa 1983) 29,400 sq ft open warehouse (235' E-W x 125' N-S) with a 6" dry system. The riser is in the NE corner of the bldg. The new owner wants to add 2,800 sq ft of offices in the SW corner. No problems so far...
The problem is that the dry system is gridded and...
I'm looking at an old frat house that needs sprinklers. It's part of an overall "refreshing" of the building. They call for a 13R system. The basement and two floors up avg 2,800 sq ft and then a top floor is one big room where all the boys sleep, about 1235 sq ft. This is a typical frat design...
I have a site with nine Pacific States Cast Iron Pipe Company (PSCIPCO) M2 hydrants of 1971-1975 vintage. This is a Corey, or toggle type hydrant and it's clear to me that it is an obsolete model but I can't even find a decent diagram of one.
The problem is that one of them is broken, or I...
Sorry for the tongue twister.
This is more of a field observation and I'm curious whether anyone else has encountered a similar problem.
Focus- systems built from the late '80's into the '90's and equipped with Central/Gem with Belleville (brass cup) seats.
Back story-
I'm sure most on here...
Is there a specified schedule for antifreeze replacement? A respected colleague swears that antifreeze is to be replaced every 10 years, but can't cite the code. I can't find anything in NFPA 25 stating anything about antifreeze longevity. I have a good number of antifreeze systems to service...
I am doing an addition to a dry pipe sprinkler system built circa 1986. It's a tall steel warehouse and a mezzanine with offices is going in one end. We'll be running all new lines off of a new mechanical tee on the riser.
My question is- since the old system is all black pipe, can I use black...
Back when I first started doing calculations I was told that when calculating sprinklers that I need to strive for a minimum of 14 psi regardless of required flow. We often do jobs in smaller towns with not so robust water flow figures. When possible I will reduce the K factor to bring my...
Some time back I made some alterations to a standpipe system. This forum proved invaluable for hydraulic calculations, and now I return with a question regarding flow testing of it.
Flow verification testing will consist of flowing three (2 1/2") ports simultaneously. Each port needs to flow...
I am doing a 13R sprinkler system in an 8 unit motel. The water supply is 1 1/2" for both domestic and fire.
The only available spring loaded automatic domestic shutoff valve is a 1" size. I need more supply than that.
It was suggested to me that a solenoid control valve could serve the same...
Trying to be brief, I'm involved in a hospital remodel that has two dry 6" standpipes (circa 1972) about 200 ft. apart. The remodel means that the FDC of one of them is going away. It was decided to interconnect the standpipes across the 4th floor roof to fix the problem.
The original hospital...
