FAN_Test_Report_-_MCAAP2015_2015-11-19_0916.pdf

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Enclosure Integrity Test Report

In compliance with NFPA 2001 (2012 Edition) Annex C Enclosure Integrity Procedure and using

FSSA peak pressure equations

INSERT COMPANY LOGO

Automatic Protection Systems, Tulsa OK

Tested building: B16

Tested enclosure: Server,Battery,Telco,Office

Building Address: MCAAP

Performed for: None

Performed by: Mark Jimison Certification level 2

Test date: 2015-11-17 Associated Test file: \\apsbadc1\users\mjimison\Retrotec\Tests\MCAAP2015.fxml

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Summary – Server,Battery,Telco,Office

FanTestic Integrity version: 5.7.24 licensed to: Automatic Protection Systems, Tulsa OK

Test date: 2015-11-17 By: Mark Jimison Certification: 2

Location: MCAAP Building: B16

Witness: Wardrip, Wade wade.d.wardrip.civ@mail.mil

Hold Time compliance based on Annex C of NFPA 2001 (2012 Edition) Calculations predict that the enclosure will maintain the minimum concentration of 5.95% at the required protected height of 7.3 ft for 10 minutes. The enclosure PASSES this acceptance procedure because this hold time is greater than the specified minimum of 10 minutes.

Peak Pressure compliance using FSSA equations Calculations predict a maximum positive peak pressure of 131 Pa. This pressure is less than the specified maximum enclosure pressure limit of 500 Pa, therefore the enclosure PASSES this part of the procedure

Calculations predict a maximum negative peak pressure of 293 Pa. This pressure is less than the specified maximum enclosure pressure limit of 500 Pa, therefore the enclosure PASSES this part of the procedure.

Enclosure conditions prior to discharge Extinguishing agent details

Net protected volume, V [cu ft] 15,865.4 Agent FM200 (NFPA) [HFC-227ea]

Max flooded height, Ho [ft] 9.8 Quantity [lb] 649.0

Required protected height, Hp [ft] 7.3 Type Halocarbon

Design temp, T [°F] 70.0 Discharge time, [s] 10

Enclosure pressure limit, [Pa] 500 Mixing during hold time No

Specified Hold Time, [min] 10 Initial concentration, ci 8.4755%

Elevation, [ft] 768 Design concentration, c 7.0%

Minimum design humidity 30% Bias during Hold, Pbh [Pa] 0

Maximum design humidity 60%

Test equipment Hold time results

Fan make/model Retrotec 3000SR

Fan serial # H01077 Leakage exponent, n 0.5879

Fan calibration date 2015 Leakage constant, k1 [CFM/Paⁿ] 300.0

Gauge make/model DM-2 Total Leakage Area, [sq in] 341

Gauge serial # 201504

Gauge calibration date 2015 Predicted Hold Time, t [min] 10

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Assumptions and warnings While FanTestic Integrity software may identify clean agent peak pressure and hold time risks, use of this software does not in any way guarantee the elimination of those risks.

Enclosure Integrity (hold time) The enclosure was tested in compliance with NFPA 2001 (2012 Edition) Annex C Enclosure Integrity Procedure.

These tests only address potential failures in maintaining extinguishing agent concentration due to excessive enclosure leakage. The following assumptions were made:

The initial extinguishing agent concentration as indicated in the test report will be achieved.

Ductwork connected to air-handling systems that are outside this enclosure will be either isolated with dampers or will be shut down during the hold time.

If air handlers are used to provide continuous mixing, they will be dedicated to this enclosure and will not create significant flows across the enclosure boundaries.

An adequate return path for the air flow was provided during the enclosure integrity door fan tests.

All intentional openings will be sealed during the enclosure leakage for hold time tests.

There are NO fans that continue running during the hold time or heat sources that will produce enough air circulation to cause a ‘continuous mixing’ condition within the entire enclosure.

All other non-integrity tests, as outlined in the NFPA standard, will be satisfactorily completed.

Enclosure Integrity (peak pressure) Enclosure integrity tests and calculations were performed to determine that the enclosure has adequate venting to provide peak pressure relief as required by NFPA 2001 (2012 Edition) section 5.

Calculations for peak pressure were performed using equations from the Fire Suppression Systems Association

(FSSA) “Pressure Relief Vent Guide”.

The following assumptions were made:

All intentional openings will be set to the operating condition expected during the agent discharge for positive peak pressure relief when enclosure leakage is tested for positive vent area.

In addition, for halocarbons only, all intentional openings will be set to the operating condition expected during the agent discharge for negative peak pressure relief when enclosure leakage is tested for negative vent area.

Adequate air flow was provided along a path leading to outdoors for the test fan but the doors surrounding the enclosure were set in the position that provide the lowest air flow required to establish the required test pressures.

Design temperature inside the tested enclosure during discharge is 70.0 °F.

Relative humidity in the enclosure will range between 30% and 60%.

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Background

Hold time prediction, Descending Interface Model

This procedure predicts the hold time for the extinguishing agent/air interface to drop to the specified minimum protected height, based on the variables shown in this report. Due to the conservative assumptions regarding leakage distribution, this prediction model usually predicts a shorter retention time as compared to an actual discharge, but not always.

This prediction only applies to conditions as found at the time of the test. Additional penetrations, weather, open doorways, HVAC modifications, malfunctions and the inherent assumptions in the enclosure integrity procedure could all combine to give very different results in a real discharge.

Leakage area defined for hold time

The Total Enclosure Leakage test measures all unintentional holes in the enclosure, the sub-floor and the above-ceiling space, whether or not extinguishing agent will leak out of these holes. All intentional openings (such as installed pressure relief vents) must be held in their closed position but not sealed. The measurement is performed over a range of pressures so that the exact leakage rate at lower pressures for agent loss will be known. The predicted hold time is worst case since it is assumed that half of the measured leakage is located in the ceiling and the other half is located in the floor.

Leakage area defined for Peak Pressure

Leakage for peak pressure does not depend on leak location, making the Total Enclosure Leakage test accurate for peak pressure prediction. All intentional openings (such as installed pressure relief vents) must held in the positions they are expected to be in during the positive peak pressure spike during discharge. For halocarbons, this test must be repeated where all intentional openings (such as installed pressure relief vents) must held in the positions they are expected to be in during the negative peak pressure spike during discharge. The measurement is performed over a range of induced test pressures so that the exact leakage rate at the higher reference pressure of 125 Pa for venting will be known. The predicted peak pressure will then be based on an enclosure leakage that accurately represents the free vent area faced by the agent discharge.

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Discussion of Results – Server,Battery,Telco,Office

Hold Time

Compliance with Annex C of NFPA 2001 (2012 Edition)

It is predicted that a Total Enclosure Leakage measurement of 341 sq in maintains the minimum concentration of 5.95% at the minimum protected height of 7.3 ft for 10 minutes. This hold time is greater than the specified minimum of 10 minutes, therefore the enclosure PASSES this acceptance procedure. It was assumed that there was no ‘continuous mixing’ condition during the hold time. Predicted hold time was therefore calculated based on a descending interface model.

Peak Pressure

Compliance with section 5 of NFPA 2001 (2012 Edition)

5.3.7: The protected enclosure shall have the structural strength and integrity necessary to contain the agent discharge. If the developed pressures present a threat to the structural strength of the enclosure, venting shall be provided to prevent excessive pressures.

And that the following shall be submitted for approval to the authority having jurisdiction:

5.1.2.2 (10): maximum positive and the maximum negative pressure... expected to be developed upon the discharge of agent

5.1.2.2 (28): pressure relief vent area… to prevent development of a pressure difference across the enclosure boundary that exceeds a specified enclosure pressure limit.

Calculations for peak pressure, based on leakage area of Enclosure Only at a standard reference condition of

125 Pa and using no pressure relief vent (PRV), determined:

The enclosure would represent a free vent area during discharge of 426 sq in with the enclosure set up in the condition expected to occur during the positive pressure pulse caused by the agent discharge which is predicted to be 131 Pa. This pressure is less than the specified maximum of 500 Pa, therefore the enclosure PASSES this part of the procedure

The enclosure would represent a free vent area during discharge of 426 sq in with the enclosure set up in the condition expected to occur during the negative pressure pulse caused by the agent discharge which is predicted to be 293 Pa . This pressure is less than the specified maximum of 500 Pa, therefore the enclosure PASSES this part of the procedure.

Vents should be installed high in the enclosure so that mostly air is exhausted, instead of the heavier extinguishing agent. Additionally, the vents should be rated to fully open between 80-130 Pa. Once a vent is installed or it is decided to use leakage of the enclosure only to relieve pressures during discharge, the chosen venting situation is used to calculate expected peak pressure, and the available free vent area must be enough to relieve this peak pressure in order to pass. All leakage areas are extrapolated to a standard reference condition of 125 Pa which is representative of conditions where most of the peak pressure will be relieved

Peak pressure calculation detail

Using the leakage area of Enclosure Only and equations from the Fire Suppression Systems Association (FSSA)

“Pressure Relief Vent Guide”:

At the highest humidity of 60%, a peak positive pressure of approximately 131 Pa would form.

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At the lowest humidity of 30%, a peak negative pressure of approximately –293 Pa would form.

Free vent area required calculation detail

Assuming an Enclosure Pressure limit of ±500 Pa, this enclosure requires a total vent free area of 83 sq in in the positive direction and 286 sq in in the negative direction to maintain the enclosure’s structural integrity.

Free vent area available calculation detail

The leakage area during discharge will be:

426 sq in for the Enclosure Only with the enclosure set up in its Positive Discharge Period Condition, where any dampers or installed PRV were fixed in the position they would assume under +125 Pa.

426 sq in for the Enclosure Only with the enclosure set up in its Negative Discharge Period Condition, where any dampers or installed PRV were fixed in the position they would assume under -125 Pa.

Additional PRV area required detail

The Enclosure Only provides 426 sq in of positive venting area. Since this is more than the required total of 83 sq in, this enclosure does not require any additional PRV area to maintain structural integrity and pass the peak pressure procedure in the positive direction.

The Enclosure Only provides 426 sq in of negative venting area. Since this is more than the required total of 286 sq in, this enclosure does not require any additional PRV area to maintain structural integrity and pass the peak pressure procedure in the negative direction.

Test Data Appendix– Server,Battery,Telco,Office (add notes here)

Enclosure Construction Data The maximum flooded height used in the calculations is 9.8 ft. The equipment was installed in the room, and the top of the rack was measured to be 7.3 ft, so 7.3 ft was taken as the minimum height for protection. Net protected volume used is 15,865.4 cu ft. Building elevation used is 768 ft, and the elevation correction factor used in the calculations is 0.972.

Total Enclosure Leakage test data Based on measured values, the enclosure alone has an equivalent leakage area of 341 sq in at a reference pressure of 10 Pa.

AHU room North of the server room has vents that are open to this room. a unit recirculates air thru there. The room passed however the volume was not included. Recommend putting dampers in the openings and closing them on agent release. The other option would be to add agent to the AHU room.

The following table represents the results from the enclosure integrity procedure carried out on the whole enclosure, with all intentional openings sealed.

Test conditions

Test date 2015-11-17 Inside temperature, Te [°F] 68 °F

Test time 13:04 Outside temperature, To [°F] 68 °F

Operator location Inside Bias pressure, Pbt [Pa] -3.00

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Pressurize Data Depressurize Data

Induced pressure [Pa] 12.2 43.0

-15.3 -44.0

Fa n

R an ge A

Fan Pressure [Pa] 83.3 285

Fa n

R an ge

C

58.5 440

Flow [CFM] 2468 4578 332 932

Total Flow rate [CFM] 2467.7032 4577.7771 331.559 931.5814

Leakage exponent, n 0.55802 0.85806

Leakage characteristic, k1 [CFM/Paⁿ]

540.50 38.491

Leakage area at 10 Pa [sq in]

574.37 81.62

Correlation, r 1.000 1.000

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Venting data for Enclosure Only There was no PRV installed for pressure relief so the Total Enclosure Leakage measured was extrapolated to the reference pressure of 125 Pa and used in further calculations as the only available leakage for peak pressure relief.

In the case where the leakage area of the PRV only was to be used for pressure relief, but leakage area for enclosure and vent was entered as the venting area dataset, to determine leakage area for pressure relief by

PRV alone, the leakage of the enclosure would have been subtracted from the leakage of the venting dataset.

In the case where the leakage area of the enclosure and PRV was to be used for pressure relief, but leakage area for vent only was entered as the venting area dataset, to determine leakage area for pressure relief by the enclosure and PRV, the leakage of the enclosure would have been added to the leakage of the venting dataset.

Positive direction data

The positive free vent area provided by the Enclosure Only is 426 sq in, for the enclosure set up in its Positive

Discharge Period Condition, with all dampers or installed PRV fixed in the position they would assume under

+125 Pa.

The leakage of the Enclosure Only in the positive direction was obtained by measuring, and this leakage was manipulated as necessary to determine the leakage area of the Enclosure Only required for positive pressure relief.

Negative direction data

The negative free vent area provided by the Enclosure Only is 426 sq in, for the enclosure set up in its Negative

Discharge Period Condition, with all dampers or installed PRV fixed in the position they would assume under -

125 Pa.

The leakage of the Enclosure Only in the negative direction was obtained by measuring, and this leakage was manipulated as necessary to determine the leakage area of the Enclosure Only required for negative pressure relief.

Peak Pressure data Peak pressure was calculated using the leakage of the Enclosure Only and equations from the Fire Suppression

Systems Association (FSSA) “Pressure Relief Vent Guide”. FSSA equations depend on experimentally derived curves for peak pressure based on a Leak to Volume ratio for the enclosure.

Design details

Enclosure pressure limit, [Pa]: 500 Discharge time, [s]: 10 Pressure relief vent type: no pressure relief vent (PRV) Peak Pressure relief using: Enclosure Only

Peak Positive Pressure Venting summary – Positive Direction

Peak positive pressure, [Pa] 131 Minimum required leakage, [sq in] 83

Leak to volume ratio, LVRpos [sq in/cu ft]

26.9 Venting area used, [sq in], (describes

Enclosure Only)

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Additional PRV area needed, [sq in] 0

Peak Negative Pressure Venting summary – Negative Direction

Peak negative pressure, [Pa] 293 Minimum required leakage, [sq in] 286

Leak to volume ratio, LVRneg [sq in/cu ft]

26.9 Venting area used, [sq in], (describes

Enclosure Only)

Additional PRV area needed, [sq in] 0

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Test Equipment The following test equipment was used in the performance of the enclosure integrity tests.

Fan Fan serial Fan calibration Gauge Gauge serial

Gauge Calibration

#1 Retrotec 3000SR H01077 2015 DM-2 201504 2015

Fan Calibration Certificate Retrotec 3000SR:

Retrotec 3000SR H01077

Range n K K1 K2 K3 K4

Open(22) 0.5214 519.6183 -0.07 0.8 -0.115 1

A 0.503 264.9959 -0.075 1 0 1

B 0.5 174.8824 0 0.3 0 1

C8 0.5 78.5 -0.02 0.5 0.016 1

C6 0.505 61.3 0.054 0.5 0.004 1

C4 0.5077 42 0.009 0.5 0.0009 1

C2 0.52 22 0.11 0.5 -0.001 1

C1 0.541 11.9239 0.13 0.4 -0.0014 1

L4 0.48 4.0995 0.003 1 0.0004 1

L2 0.502 2.0678 0 0.5 0.0001 1

L1 0.4925 1.1614 0.1 0.5 0.0001 1

Flow in CFM using the above calibration factors is calculated as follows: