When Would Dry Trip Time Alternatives Apply?

9/10/2024

I'm trying to understand how (if) Section 7.2.3.8 of NFPA 13, 2016 Edition could be applied.

Dry pipe systems with water delivery times other than 7.2.3.2, 7.2.3.5, and 7.2.3.7 shall be acceptable where listed by a nationally recognized testing laboratory.

When would this come into play?

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6 Comments

Glenn Berger

9/10/2024 08:10:08 am

This clause is special system catch-all. I have not seen a condition when required yet.

Dan Wilder

9/10/2024 09:02:44 am

I went down a rabbit hole looking for when and why this language was introduced (2002-2007 if you look at the ROP/ROC info on NFPA) and don't want to completely waste that time so 7.2.3.8 has an allowance specifically (and without favoring a specific manufacturer) alternate fire protection schemes for systems required to be calculated for delivery times...like a Quell system or Negative Pressure systems which incorporate their own calculation software (or a version of it specific to that technology).

So 7.2.3.2 says that the size of the system doesn't matter if you can get water to the test connection within 60 seconds (an actual test) with the exception of systems with capacities below 500 (without a quick open device) & 750 (with a quick open device) gallons.

If you can't comply with that (system size limitation), 7.2.3.5 says you can calculate the water delivery based on the Table 7.2.3.6 showing the Hazard and corresponding Maximum time (Nationally Recognized Program-currently only 1 available).

7.2.3.7 is specific to Manifold test connections as allowed by the previous Table in 7.2.3.6.1 (an actual test).

Link has some great information on the enhanced content in the later editions that explain a lot of this....

Pete H

9/10/2024 09:12:04 am

Solid research!

Quell systems being the exception that causes the rule for this one makes a lot of sense in my head.

Anon

9/10/2024 09:14:55 am

Like mentioned above, it would apply when a system is over the max gallons allowed. You would need to run a delivery calculation to prove that it works in the times set by the table mentioned. There are two major companies that supply this service, besides learning the program and doing the calculations yourself.
Fun fact, most FM jobs will require this for a pre-action system regardless of size.

Jesse

9/10/2024 12:58:24 pm

The only example I can think of here is Tyco's Quell system

Jack G

9/11/2024 10:13:30 am

I ve always used the tyco program when the situation arose.
Really good program. Russian PHD s wrote it they said, when it first came out. Our company was one of the beta testers.
.

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When Would Dry Trip Time Alternatives Apply?

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