The columnist addresses inquiries ranging from the adoption of energy codes by building codes, to valve supervision requirements, to specifics about NFPA 13.
Q:
All building codes have adopted some form of energy code. The UBC, for
instance, adopted the Model Energy Code, which goes with ASHRAE/IS 90.1 for
commercial buildings. A key point is that the UBC requires that a major
renovation of a building include full code upgrades. This would include energy
conservation by means of proper roof insulation. The ceiling alone could be
insulated and air proofed, which would put the designer back into the dry-pipe
option. I think that if the roof is insulated, wet pipe would suffice. This can
compensate the cost (compared to dry-pipe), comply with the energy code and
give energy savings over the life of the building. Compliance with energy codes
should be a consideration in the project. In fact, the authority should
probably demand such upgrades. If so, the fire protection could be kept as wet.
Wouldn’t you agree?
A: What we see most often in the northern states, in terms of insulation, is
that the suspended ceiling will get the lion’s share, in order to minimize
heating bills. As usual, the engineering decisions are economically driven. In
this case, I don’t think the AHJ in question gave any consideration to energy
code compliance whatsoever.
Q:
My question concerns supervision of a 1" valve. In general, we look to the
building codes to determine valve supervision requirements because NFPA 13
won’t keep you out of legal trouble. Just to take a couple of examples, the
BOCA National Building Code requires electronic supervision for certain
occupancies, while the UBC bases valve supervision on number of sprinklers.
Other building codes require compliance to NFPA 72, which doesn’t even address
locking. In addition, we’ve really been scrutinized for supervision of valves
on alarm lines as required by NFPA 72. Is this the proper
approach?
A: A while back, I received some flak from a manufacturer of tamper switches
for my remarks regarding the tamper switch on the dry valve trim. Frankly, I
was unaware of the NFPA 72 requirements. Here in Chicagoland, this is something
that just doesn’t happen (on the dry valve trim). At any rate, the manufacturer
forwarded a load of documentation (including various code requirements) for my
information and future reference.
Q: I have a concern about a current project-an existing school
building that has been added onto several times in the past 70 years.
Currently, we are adding three new additions (north, south, west) onto the
building. We are providing sprinklers in the areas that are being added or
remodeled. The original part of the building is not having sprinklers
installed. A two-hour fire separation is provided between the new additions and
the original building. Because of the size and configuration of the building,
two separate fire services were brought into the additions on the north and the
south. To serve the 2,000-sq.-ft. locker room addition on the west, we propose
to route the sprinkler piping through the corridor and gym of the existing
building between the addition on the north and the addition on the
west.
A question has been raised as to the acceptability of this pipe routing with
regards to NFPA 13 (1999). The only reference that I can find in NFPA 13 is in
Appendix A, Paragraph A-5.1. However, I do not feel that this applies for two
reasons: first, the original building is not of combustible construction; and
second, the locker room addition on the west is small enough that it could be
served off a limited area sprinkler system, as permitted by BOCA. In that case,
there would be no alarm devices. Also, there is additional assurance of
obtaining adequate water flow from a dedicated sprinkler
system.
I anticipate that the school board will have to do something in the very near
future to the remainder of the building that was not remodeled because the
additions/remodels were air-conditioned. The original part of the building is
not air-conditioned. When that occurs, I would expect to put sprinklers in the
remainder of the building as part of that project. I would greatly appreciate
any input that you could offer on this
matter.
A: Schools as well as hospitals are notorious for these kinds of
“one-at-a-time” add-ons to original buildings. And the reason for this can be
found by investigating how funds for their construction projects are budgeted.
What you are proposing is sound. It makes perfect sense to route the piping for
the locker rooms from the new sprinkler system piping. Some insurance companies
ask for all sprinkler piping to be routed through sprinklered areas; in that
case, you would be asking for sprinklers in each room that the new (naked) feed
pipe is to pass through-specifically, the gym and the corridor. This is not an
extraordinary addition in terms of cost, and may be a good idea in lieu of the
fact that gymnasiums also are large assembly areas at times throughout the
year.
What you wind up with is a partially sprinklered building that (hopefully) will
be completely sprinklered at some future date, as available school funds
dictate.
What I would also do, if feasible, is to interconnect the FDC supply piping in
such a fashion that a single fire deptartment connection, located on the street
side of the school, could service both systems. The sprinkler riser rooms
should have exterior access, and some thought should be given to perhaps
sprinklering some of the existing areas, such as the stage, library stack room,
shop and/or paint storage areas.
Q: A 3,000-gpm fire pump was installed to provide protection to
an industrial facility with controlled access (the facility is located in a
military depot). The section on fire pumps in the construction specifications
calls for the fire pump installation to comply with NFPA 20. However, in
another section of the specifications, pipes, valves and fittings are specified
to meet AWWA standards. As a result, the contractor installed a UL-listed fire
pump and controller, but installed piping, valves and fittings per AWWA
standards. Pipes and fittings are carbon steel per ASTM A53, which meets NFPA
20. The valves (non-rising stem), however, are provided per AWWA Standards. The
installation is about three years old.
Realizing that NFPA 20 requires valves to be the O, S and Y type and listed for
fire protection service, is it a must to replace the AWWA-rated valves that
have been installed with UL-listed, O, S and Y type in order to meet NFPA 20?
That the valves are not O, S and Y does not appear to be an issue since the
valves are locked open, and the pump house itself is normally locked and can be
accessed by authorized personnel only. I guess the issue here really is whether
the AWWA-rated valves are functionally equivalent to valves that are UL listed
for fire protection service. Your comments would be highly
appreciated.
A: It’s a standard requirement of both NFPA 13 and 20 that all system control
valves be of the indicating type. Many authorities accept indicating butterfly
valves in the fire pump and bypass assembly. Ordinarily, an insurance company
or municipal fire prevention bureau would call for the replacement of the
AWWA-approved, non-rising stem valves in this instance. However, since the
valves are locked in the open position, it does seem hard to distinguish what
the fuss is about. Requiring the outside stem and yoke valves is just seen as
standard, good safety practice for fire protection systems. In your case, it
all depends on the attitude of the AHJ.
Q: We’ve been asked by one of our clients about providing
sprinkler protection in an accessible trench for their press operations. The
press equipment is punching out large sheets for use in the manufacture of
residential laundry equipment. Is there design criteria covering this type of
installation? We have not been able to find anything in NFPA yet-although that
doesn’t mean it’s not there! There is a horizontal conveyor in the trench for
material handling. The trench is approximately 50' long. Any assistance will be
greatly appreciated.
A: I don’t know of anything in the NFPA codes that specifically covers this
application. However, this particular risk represents a definite life-safety
hazard-not only because the frequency of fires is higher in such a case, but
also that these fires grow very quickly in proportion to the amount of grease
and oil in this location. I would recommend a deluge system for this press, one
that covers both the equipment and the accessible trench. The system should be
tripped by some type of detection system, and also one or two manual trips. A
high density is required (.30 gpm/sq.-ft. or higher), which may or may not
necessitate a booster pump. Another good idea is to provide a hand-hose station
close to this vicinity.