Temperature of Large Drop Sprinklers in High Storage Applications

[Haldorson]

Hello,

When using large drop sprinklers for high storage applications, should the temperature settings for the sprinklers be 155 F or 286 F? I can't seem to find anything specific in NFPA 13 2007 OR 2010. Can you provide a code reference is there is one?

Thanks.

 

[cdafd]

Not a designer

But do you know what is being stored , how high and manner of storage

If so than what are you designing to nfpa 13 or other

If 13 do you have a section with the design you picked?

 

[stookeyfpe]

Unanswerable.

The storage provisions were completely revised between the 2007 and 2010 editions of NFPA 13. Under the 2010 edition, large drop sprinklers are classified as CSMA sprinklers. In the 2007 edition, specific requirements for large-drop sprinklers were called out. Secondly, a new section addressing temperature ratings may impact your design (see Section 12.6 of the 2010 edition).

You need to select a design standard if one is not called out in the specification. No specification - you pick the standard unless the AHJ says otherwise.

 

[Haldorson]

Our code calls for NFPA 2007. I looking to use Table 16.2.2.1(a). Commodity Class III, 11.2-K Large Drop, Max storage Height 20', Max ceiling height 30', Dry, 25 design sprinklers @ 25 psi, no hose stream requirements.

 

[TravisMack]

Why not consider standard spray 11.2k sprinklers?

Class III in single/double row racks, 8' aisle, non encapsulated is 0.37/2600 (dry system). This is 962 gpm + 500gpm outside hose if applicable. If the sprinklers are at 100 sq ft, then you only have 11 psi minimum pressure. If your rack arrangement is different, then this wouldn't work.

Large drops (CMSA) sprinklers are more expensive, have tighter restrictions and you are looking at 1400 gpm + hose allowance.

I don't have the exact section handy, but for 11.2k and larger, you can use the credit for high temp sprinklers even when using ordinary temp sprinklers. We do high temp just out of common practice for these.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[Haldorson]

Hi Travis,

The racking situation here is interesting: the 5' aisles are spaced 40' apart and the racks are 32' deep (8 pallets deep). They do not want in-rack sprinklers. The only solution I can generate is Table 16.2.2.1(a) (2007).

Update: there are 346 LD sprinklers in North America. All of them have been boxed and are being shipped to Luxembourg. The manufacturers won't be able to supply replacement LD sprinklers in time. I am now looking at Tyco ELO-231, 11.2-k sprinklers. I'm not sure there is a solution to this one.

 

[FSEi]

ELO-231 (TY5111) aren't LD or CMSA sprinklers.

NFPA13 2007 allows you to use NFPA13 2010 under section 1.5 equivalency or 1.6 new technology

this would allow you to use any CMSA head including Viking VK540 (11.2k)