“MODELADO DEL PROYECTO ERP UTILIZANDO EL ADL SELECCIONADO”

The manifold riser and complicated geometry of the facility requires evaluation of multiple hydraulically remote areas. Essentially, each riser from the manifold would need a hydraulic evaluation because each area is slightly different. Extended coverage sprinkler heads were used in the office spaces to limit piping and lower costs. Furthermore, the hydraulic calculations,

sprinkler layout drawings for the third floor, and equipment submittals could not be retrieved for this building.

Each riser has a 6 in pipe of unknown schedule that rises through the floor and ties into a reduced pressure backflow preventer (RPBP), FEBCO Model 860. Six-inch line continues from the RPBP up to the fire alarm check valve. From the check valve the line enters a manifold where four riser on the north or five risers on the south branch out. With one exception, all lines leaving the manifold are 4 in. The exception is the south high bay, which has is fed from a 6 in. line.

For the purpose of this project, the hydraulic analysis will evaluated the water demand for the south high bay. The south high bay has been chosen since it is extra hazard group 1, and has an elevation that extends to the second floor RMSEL, approximately 34 ft on the east side of the bay.

The ceiling is slanted and the branch line on the west end is approximately 29 ft. Four branch lines approximately 120 ft long and are spaced 10.5 ft apart. Sprinkler spacing along the branch lines is 8 ft. The end lines are approximately 2 ft and 7 in away from the wall. A layout of remote area is given in.

The protection area for each sprinkler is then

A_S=

(

) ( )

The protection area and sprinkler spacing of 15 ft meets the requirements of Table 8.6.2.2.1(c) of NFPA 13-2013. The number of sprinklers on the branch line is then

BranchLineSprinklers=1.2 2500

8 =8sprinklers (3-2)

Chapter 3 – Fire Suppression 3-6

Figure 3-4. South high bay most remote area

The make and model of the sprinkler are unknown. However, the shop drawing indicate the sprinklers are 1/2 in. pendants and have an activation temperature of 160°F. For this analysis it is assumed the K-factor for the sprinklers are 5.6 and all pipe is schedule 40 new with a C-Factor of 120. The most hydraulically remote 2,500 ft² has 30 sprinklers, which means the west branch, which is closest to the riser will only have 6 sprinklers flowing. See the following screenshots for the analysis.

Chapter 3 – Fire Suppression 3-7

Figure 3-5. Hydraulic analysis of south high bay

Chapter 3 – Fire Suppression 3-8

Figure 3-6. West branch line analysis - needed for different K-factor

The hydraulic analysis demonstrates the south high bay requires 798 gpm/ft² at a pressure of 45.7 psi. An addition 500 gpm is needed for the hose stream allowance. Water supply to the southwest hydrant is 2,163 gpm at 68 psi, which accounts for a 15% safety factor Sandia

incorporates into its sprinkler specification. The water supply is capable of meeting the sprinkler system demand.

Chapter 3– Fire Suppression 3-9

Figure 3-7. Water supply and sprinkler demand

Chapter 3– Fire Suppression 3-10 3.4 Inspection, Testing and Maintenance

Sandia’s Inspection, Testing, and Maintenance (ITM) program uses NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems (Ref. 9) as the basis for its frequencies and required actions. In 2007 Sandia was granted an equivalency for changes inspection frequency associated with gauges (wet, dry, preaction, and deluge systems), valves (all types, including AFFF), and backflow prevention assemblies (reduced pressure) from monthly to quarterly to align with the quarterly test interval. As part of the 2007 equivalency, Sandia was allowed to change the inspection frequencies associated with hanger/seismic bracing, pipe and fittings, sprinklers, hose cabinets, and exposed water supply piping from annual to a 3 or 5 year interval depending on the fire protection assessment schedule for the building. A complete table listing the ITM for RMSEL wet-pipe suppression system is provided below.

Table 3-3. Sprinkler devices and associated ITM schedule Sprinkler

Component Inspection Testing Maintenance

Backflow Preventer

Quarterly Annually – Exercised by conducting a forward flow

test

As needed

Control Valves Quarterly – ensure normally open valves are open.

Annually – operated through full range and returned to its

normal position

Annually – lubricate OSY valves; close and

reopen to lubricate entire screw.

Check Valves Interior every 5 years NA Internal components shall be cleaned,

 Retarding chamber or alarm drains are not

Quarterly – Verify that they are free of physical

Valve supervisory Quarterly – Verify that they are free of physical

damage

Semi-annually As needed

Chapter 3– Fire Suppression 3-11 Sprinkler

Component Inspection Testing Maintenance

Gauges (wet pipe)

Quarterly – Ensure gauges are in good condition and that normal water supply is

being maintained

5 years – Replaced or tested with calibrated gauge

As needed

Hydraulic nameplate

Quarterly – verify it is provided, attached building) – Verify free from

damage

NA NA

Pipe and fittings 3 or 5 year (depending on building) – Verify in good

condition and re of

 Verify in good condition and re of mechanical

20 years – fast response sprinklers 50 years – sprinklers in service for 50 years shall be

replaced or representative sample from on or more sample area shall be tested.

Spare sprinklers 3 or 5 year– Correct number and type of sprinklers as required; a sprinkler wrench for each

type of sprinkler

See sprinklers above NA

Chapter 3– Fire Suppression 3-12 Sprinkler

Component Inspection Testing Maintenance

Fire department connections

Quaterly –

 Verify FDC is visible and accessible

 Couplings or seivels are not damaged and rotate smoothly

 Gaskets are in place and in good condition

 Signs are in place

 Auto drain valve in place and operating smoothly

 FDC clappers are in place

 Interior is free from obstructions

NA NA

Obstruction, internal inspection of

piping

Minimum 5 years – Inspect for the presence of

foreign organic and inorganic material

NA NA

Main Drain NA Annually – Determine if there has been a change to the

water supply

NA

Chapter 4 – Fire Detection and Alarm 4-1