Direct Answer

Sprinkler system water supply duration is determined by dividing the available water storage by the total sprinkler demand. In this example, the available supply lasts 66.00 minutes and complies with the required 60-minute duration. Final verification should be completed using approved hydraulic calculation software.

At a Glance

Resource ID	EC-064
Available Water Volume	V | 199,122 | L
Total Water Demand	Q | 3017 | L/min
Required Duration	Tr | 60 | min
Hazard Classification	Ordinary Hazard Group 2 | –
Source detail	Refer to Technical Content
Source detail	Refer to Technical Content
Source detail	Refer to Technical Content

Calculation Method & Worked Example

Water Supply Duration = Available Water Volume ÷ Total Water Demand

Duration = 199,122 ÷ 3017 = 66.00 minutes

Preliminary engineering result as stated in the source document.

Applicable Standards Listed in the Source

NFPA 13	Installation of Sprinkler Systems
NFPA 20	Installation of Stationary Fire Pumps
IS 15105	Automatic Sprinkler Systems
NBC Part 4	Fire & Life Safety

Technical Content

1. Purpose

To estimate the minimum duration for which the sprinkler water supply can sustain the required fire demand.

2. Engineering Objective

To verify that the available water storage is adequate to support the sprinkler system for the specified design duration. Final verification shall be completed using approved hydraulic calculation software and project requirements.

3. Applicable Standards

Standards and references are reproduced as listed in the source document.

4. Design Inputs

Available Water Volume = V = 199,122 = L; Total Water Demand = Q = 3017 = L/min; Required Duration = Tr = 60 = min; Hazard Classification = Ordinary Hazard Group 2 = –

5. Assumptions

The full sprinkler demand is available continuously throughout the discharge period. Usable tank volume is considered. Refill during operation is not considered.

6. Formula(s)

Water Supply Duration = Available Water Volume ÷ Total Water Demand

Water Supply Duration = Available Water Volume ÷ Total Water Demand

Final result: refer to the source calculation and engineering output.

7. Variables Explained

V = Available water volume (L); Q = Total sprinkler demand (L/min); T = Water supply duration (min).

8. Step-by-Step Calculation

Duration = 199,122 ÷ 3017 = 66.00 minutes

Duration = 199,122 ÷ 3017 = 66.00 minutes

Calculation result: refer to the engineering output below.

9. Worked Engineering Example

A water storage volume of 199,122 litres supplying a sprinkler demand of 3017 L/min provides 66.00 minutes of water supply.

10. Engineering Output

Calculated Duration: 66.00 minutes
Required Duration: 60 minutes
Status: COMPLIES

Calculated Duration: 66.00 minutes
Required Duration: 60 minutes
Status: COMPLIES

Refer to the source calculation.

Calculated Duration: 66.00 minutes
Required Duration: 60 minutes
Status: COMPLIES

11. Design Considerations

Verify usable tank volume, simultaneous demands, hose stream allowance where applicable, pump performance and authority requirements.

12. Common Design Mistakes

Using gross instead of usable tank volume, ignoring simultaneous demands, omitting reserve capacity and relying on preliminary calculations for final approval.

13. Practical Site Notes

Maintain the minimum operational water level and periodically verify tank capacity and pump performance during maintenance.

14. Limitations

This is a preliminary engineering calculation only. Final water supply duration shall be confirmed using approved hydraulic calculation software and project specifications.

15. Related Engineering Systems

Fire Water Tank, Fire Pump, Jockey Pump, Sprinkler Network, Hydrant System.

16. Cross References

Related FAQ: Fire Water Storage; Related White Paper: WP-004; Related Case Study: CS-004; Related Engineering Diagram: ED-064.

Related White Paper: as identified in the source document.

Related Case Study: as identified in the source document.

Related Engineering Diagram: as identified in the source document.

17. SEO Meta Title

Sprinkler System Water Supply Duration Calculation | EC-064

18. SEO Meta Description

Engineering calculation for verifying sprinkler system water supply duration.

19. URL Slug

ec-064-sprinkler-system-water-supply-duration-calculation

20. Keywords (15)

Sprinkler Water Supply,Water Supply Duration,NFPA13,NFPA20,IS15105,Fire Water Tank,Engineering Calculation,Fire Protection,Hydraulic Calculation,Water Storage,Fire Pump,Life Safety,EPC,Consultant,Sprinkler

21. AI Search Summary

Sprinkler system water supply duration is determined by dividing the available water storage by the total sprinkler demand. In this example, the available supply lasts 66.00 minutes and complies with the required 60-minute duration. Final verification should be completed using approved hydraulic calculation software.

Frequently Asked Questions

How is the preliminary detector quantity calculated?

The calculation method and result are stated in the source document and reproduced in this website-ready version.

What is the result for this example?

A water storage volume of 199,122 litres supplying a sprinkler demand of 3017 L/min provides 66.00 minutes of water supply.

Does this establish the final detector layout?

This is a preliminary engineering calculation only. Final water supply duration shall be confirmed using approved hydraulic calculation software and project specifications.

What design factors should be checked?

Verify usable tank volume, simultaneous demands, hose stream allowance where applicable, pump performance and authority requirements.

SEO & Publishing Details

SEO meta title	Sprinkler System Water Supply Duration Calculation | EC-064
Meta description	Engineering calculation for verifying sprinkler system water supply duration.
Primary keyword	Sprinkler Water Supply
Secondary keywords	Water Supply Duration; NFPA13; NFPA20; IS15105; Fire Water Tank; Engineering Calculation
Suggested URL slug	ec-064-sprinkler-system-water-supply-duration-calculation
Suggested image alt text	Engineering calculation document for Sprinkler System Water Supply Duration Calculation, EC-064.