11.4.2* Fuel Supply Tank and Capacity.
11.4.2.1* Fuel supply tank(s) shall have a capacity at least
equal to 1 gal per hp (5.07 L per kW), plus 5 percent volume
for expansion and 5 percent volume for sump.
A.11.4.2 The quantity 1 gal per hp (5.07 L per kW) is equivalent
to 1 pint per hp (0.634 L per kW) per hour for 8 hours.
Where prompt replenishment of fuel supply is unlikely, a reserve
supply should be provided along with facilities for transfer
to the main tanks.
- Quarterly Refilling of the Fuel Tank (approx 12-weeks)
- A weekly test run for 30 Minutes
- A minimum run time of 2-hour (or 4-hours during a fire depending upon your needs)
Multiply this out and you get basically 8-hours of continuous run time depending upon your run time during a fire. Take the NFPA 20 appendix guidance of 1 pint/hr/HP (0.125 gallons/hr/HP) x 8 hours and you get 1 Gallon per horse-power.
Lets compare this to the actual published data for a specific diesel engine. Take the smallest diesel engine Cummins makes a CFP5E-F10 which produces 95HP at 1760 RPM. The published fuel rate is 4.9 Gal/hr (18.5 L/hr). 4.9 Gallons/hr x 8 hours x 1.10 (sump/expansion) = 43 gallons minimum. If we use NFPA 20 guidance we would get 95 HP x 1 Gal/HP x 1.10 = 104.5 gallons minimum. As you can see the for this specific example NFPA 20 is much more conservative.
The other item you need to verify is that the fuel tank complies with UL 142 as required by NFPA 20 (2010 edition) paragraph 11.4.1.2.1. Fuel tank sizes are limited to 1320 gallons and the standard sizes available are as follows:
Nominal Tank Sizes (Gallons) | Usable Volume (Gallons) |
119 | 105 |
187 | 165 |
300 | 270 |
359 | 320 |
572 | 515 |
849 | 766 |
1100 | 993 |
OK, but what if you need more than 160 gallons of diesel? Do you need a tank vault to comply with NFPA 101 and NPFA 30?
ReplyDeleteIn regards to NFPA 30, please note my new blog post on fuel tank accessories http://blog.anvil-fire.com/2012/04/diesel-fuel-tank-accessories-for-fire.html explaining that the applicable standard is NFPA 37 and not NFPA 30 per NFPA 20 appendix section A.11.4.3.
DeleteFor NFPA 101, I am guessing that you are referencing the "Special Hazard Protection" requirements of NFPA 101 section 8.7.1. In my opinion the quantity of fuel does present a hazard greater than that normal to most occupancies. However since the fire pump is already required to be installed in at least a 1-hour fire-rated enclosure per NFPA 20 section 4.12.1.1.2 the issue is already addressed.
Depending upon your jurisdiction, the final item to consider is the International Fire Code (IFC). IFC (2009 edition) Table 2703.1.1(1) permits up to 240 gallons (assuming a fully sprinklered building - key note 'd') prior to being classifying the room as a hazardous occupancy. It is my opinion that compliance with NFPA 37 is the most specific code and therefore over-rides all others. But this is up to your AHJ.
I am really enjoying reading your well written articles. It looks like you spend allot of effort and time on you blog.I have bookmarked it and I am looking forward to reading new articles. Keep up the good work!
ReplyDeleteNice tropic and wonderful shared to Fire Pumps, Cheers author for your great site
ReplyDeleteI am not sure about the HP you mention. If I have an engine that rated is 1500 HP BUT the pump I drive only ask for 1000HP, I will use the pump HP for sizing the fuel tank as per NFPA20 formula. Moreover, if the engine provide less power theoretically it consumes less fuel.
ReplyDeletePer NFPA 20, you need to use the HP rating of the diesel engine, and not the minimum required to drive the pump. My example was only provided to show that the NFPA 20 requirements are more than adequate to meet the 8-hour recommendation.
DeleteI am really enjoying reading your well written articles. It looks like you spend allot of effort and time on you blog. Thanks for Sharing.
ReplyDeleteDiesel Tank
Wow that's a wonderfull blog having all details & helpful. Ul Power Cord
ReplyDeleteWow that's a wonderfull blog having all details & helpful. UL power cord
ReplyDeleteWow that's a wonderfull blog having all details & helpful. Ul Power Cord
ReplyDeletethanks for the tips and information..i really appreciate it.. Engine coupler
ReplyDeleteYou’ve got some interesting points in this article. I would have never considered any of these if I didn’t come across this. Thanks!. Polyureas
ReplyDeleteI have compiled the complete list of top 7 best sump pump
ReplyDeleteIts a very good information that you have share with us and really helpful for future also. If you want to get further detail on fuel tank level gauge then contact us.
ReplyDeleteWheely | The largest platform to play wheely online games in 2019. We have a number of fun games for kids both boys and girls. visit my blog https://freeonlinegames2019.wordpress.com/
ReplyDeleteThe ground source pumps utilize both ground heat and outside air. Warmtepomp
ReplyDeleteThis is a great inspiring article.I am pretty much pleased with your good work.You put really very helpful information. Keep it up. Keep blogging. Looking to reading your next post. Warmtepompen
ReplyDeleteHe has developed an expansion where he introduced an inch of splash froth protection within the outside dividers before he introduce thick pack cellulose. Warmtepomp
ReplyDelete