While performing fire sprinkler design or fire sprinkler layout it is often necessary to scale an object or group of objects. The following information can be used to help with this process.
SCALING:
To scale an object up –
Divide little number by big number
To scale an object down –
Divide big number by little number
Paper Space Scaling –
Divide bottom number by top number then multiply by 12.
i.e. 1/8th scale
8/1 * 12 = 96
Site Plan Scale – (Assumes 1/8th scale as default)
Scale:
Scale by:
1/10 1.25
1/16 2
1/20 2.5
1/30 3.75
1/40 5
1/50 6.25
1/60 7.5
1/100 12.5
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Friday, March 30, 2012
Thursday, March 29, 2012
Fire Sprinkler Design info for Air Compressors
How To Size An Air Compressor:
To size air compressor multiply system volume x .012.
Example: 550 gal. * .012 = 6.6 CFM.
or
CFM = (SYS VOL x 40) / (30 x 7.48 x 15)
How to determine time to fill system with air:
Convert gallons to cubic feet – 1 gallon = .13368 f3
Divide system cubic feet by compressor CFM
Example: 550 * .13368 = 73.53 f3
73.53 / 6.6 = 11.14 minutes to fill system
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To size air compressor multiply system volume x .012.
Example: 550 gal. * .012 = 6.6 CFM.
or
CFM = (SYS VOL x 40) / (30 x 7.48 x 15)
How to determine time to fill system with air:
Convert gallons to cubic feet – 1 gallon = .13368 f3
Divide system cubic feet by compressor CFM
Example: 550 * .13368 = 73.53 f3
73.53 / 6.6 = 11.14 minutes to fill system
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Wednesday, March 28, 2012
WET-PIPE PROCEDURES Part 4
A. Startup:
1. Close main drain valve. Leave auxiliary drain valves, or other vent connections open.
2. Open the ¼” gauge test valves for the supply and system pressure gauges.
3. Slowly open main control valve until the sound of flowing water just starts, then open the valve one more turn.
4. Observe auxiliary drain valves and close after a solid flow of water (not aerated), has continued for at least 15 seconds.
5. Fully open main control valve.
6. Reset Tamper Alarm.
7. Verify stabilization of supply and system pressure gauges.
8. Verify that the water ceased to flow from alarm drain line.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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1. Close main drain valve. Leave auxiliary drain valves, or other vent connections open.
2. Open the ¼” gauge test valves for the supply and system pressure gauges.
3. Slowly open main control valve until the sound of flowing water just starts, then open the valve one more turn.
4. Observe auxiliary drain valves and close after a solid flow of water (not aerated), has continued for at least 15 seconds.
5. Fully open main control valve.
6. Reset Tamper Alarm.
7. Verify stabilization of supply and system pressure gauges.
8. Verify that the water ceased to flow from alarm drain line.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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Tuesday, March 27, 2012
WET-PIPE PROCEDURES Part 3
III. SYSTEM SHUTDOWN & STARTUP:
A. Shutdown
A. Close main control valve.
B. Silences tamper alarm.
C. Open main and auxiliary drains to drain system piping if repair work or sprinkler replacement is required.
NOTE: Wait until the sound of draining water has stopped and/or the inlet and outlet pressure gauges read zero pressure, before performing and maintenance work.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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A. Shutdown
A. Close main control valve.
B. Silences tamper alarm.
C. Open main and auxiliary drains to drain system piping if repair work or sprinkler replacement is required.
NOTE: Wait until the sound of draining water has stopped and/or the inlet and outlet pressure gauges read zero pressure, before performing and maintenance work.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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Monday, March 26, 2012
WET-PIPE PROCEDURES Part 2
II. TESTING:
A. Annual test-system operation.
1. Fully open inspectors test valve.
2. Check for full, unobstructed flow from test orifice.
3. Verify operations of appropriate alarms.
B. Close inspectors test valve.
C. Verify stabilization of supply and system pressure gauges.
D. Verify cessation of appropriate alarms.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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A. Annual test-system operation.
1. Fully open inspectors test valve.
2. Check for full, unobstructed flow from test orifice.
3. Verify operations of appropriate alarms.
B. Close inspectors test valve.
C. Verify stabilization of supply and system pressure gauges.
D. Verify cessation of appropriate alarms.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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Saturday, March 24, 2012
WET-PIPE PROCEDURES Part 1
I. PREVENTIVE MAINTENANCE:
1. Monthly inspect the main control valve.
i. It should open and close smoothly. Leave fully open.
NOTE: Tamper alarms will sound when the valve is moved from fully open. They will cease when the valve is again fully open.
2. Monthly inspect the monitor switch.
i. Close the control valve 2 turns and verify operations of the appropriate alarms.
ii. Re-open the control valve 2 turns and verify the cessation of the alarms.
3. Monthly inspect all trim valves.
i. Main drain should be closed.
ii. Gauge valves should be open.
4. Monthly inspect the Fire Department Connection.
i. Remove caps and verify that the waterway is clean and clear, the clapper swings freely, and the threads are in good condition. Replace caps.
ii. Verify that the ball drip is in working order.
iii. Verify that the check valve is not leaking.
5. Quarterly inspect the sprinklers.
i. Sprinklers should be free from corrosion, foreign materials, paint, and other obstructions to discharge.
ii. Sprinklers should not be bent or damaged in any way.
iii. A complete stock of spare sprinklers and a sprinkler wrench should be available.
6. Semi-annually inspect all the pipe and hangers.
i. Piping and hangers should be in good condition and free from mechanical injury.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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1. Monthly inspect the main control valve.
i. It should open and close smoothly. Leave fully open.
NOTE: Tamper alarms will sound when the valve is moved from fully open. They will cease when the valve is again fully open.
2. Monthly inspect the monitor switch.
i. Close the control valve 2 turns and verify operations of the appropriate alarms.
ii. Re-open the control valve 2 turns and verify the cessation of the alarms.
3. Monthly inspect all trim valves.
i. Main drain should be closed.
ii. Gauge valves should be open.
4. Monthly inspect the Fire Department Connection.
i. Remove caps and verify that the waterway is clean and clear, the clapper swings freely, and the threads are in good condition. Replace caps.
ii. Verify that the ball drip is in working order.
iii. Verify that the check valve is not leaking.
5. Quarterly inspect the sprinklers.
i. Sprinklers should be free from corrosion, foreign materials, paint, and other obstructions to discharge.
ii. Sprinklers should not be bent or damaged in any way.
iii. A complete stock of spare sprinklers and a sprinkler wrench should be available.
6. Semi-annually inspect all the pipe and hangers.
i. Piping and hangers should be in good condition and free from mechanical injury.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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Friday, March 23, 2012
DRY-PIPE PROCEDURES Part 3
III. SYSTEM SHUTDOWN & STARTUP:
A. Shutdown
A. Close main control valve.
B. Silences tamper alarm.
C. Open main drain.
D. Shut off air compressor supply.
E. Open all auxiliary drains to expel air and water from system piping.
F. Startup:
1. Remove faceplate.
2. Ensure that valve clapper is closed and properly seated.
3. Replace valve face.
4. Close all auxiliary valves and low point drains-main drain should remain open.
5. Prime system through priming cup. Final water level is adjusted through the priming level valve.
6. Restore air pressure in system.
7. Ensure that compressor supply valves are open to the system.
8. Slightly open main control valve. All movements of the control valves should be made slowly to avoid water hammer. Water will begin to flow into system and out through the open 2” main drain.
9. Very slowly close the 2” main drain to avoid water hammer-until completely closed.
10. Open main control valve to its full open position.
11. Verify stabilization of water and air pressure.
12. Reset tamper switches.
13. Open alarm control valve.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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A. Shutdown
A. Close main control valve.
B. Silences tamper alarm.
C. Open main drain.
D. Shut off air compressor supply.
E. Open all auxiliary drains to expel air and water from system piping.
F. Startup:
1. Remove faceplate.
2. Ensure that valve clapper is closed and properly seated.
3. Replace valve face.
4. Close all auxiliary valves and low point drains-main drain should remain open.
5. Prime system through priming cup. Final water level is adjusted through the priming level valve.
6. Restore air pressure in system.
7. Ensure that compressor supply valves are open to the system.
8. Slightly open main control valve. All movements of the control valves should be made slowly to avoid water hammer. Water will begin to flow into system and out through the open 2” main drain.
9. Very slowly close the 2” main drain to avoid water hammer-until completely closed.
10. Open main control valve to its full open position.
11. Verify stabilization of water and air pressure.
12. Reset tamper switches.
13. Open alarm control valve.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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Thursday, March 22, 2012
DRY-PIPE PROCEDURES Part 2
II. TESTING:
A. Quarterly test-system operation.
1. Open main drain valve.
2. Main should be discharging full flow.
3. Alarms should sound.
B. Close main drain.
C. Slowly drop air pressure in system through system priming valve until air compressor cycles automatically. If compressor does not cycle above 22 psi check electrical pressure switch on compressor for proper functioning.
D. Compressor should return system pressure to pre-determined pressure setting.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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A. Quarterly test-system operation.
1. Open main drain valve.
2. Main should be discharging full flow.
3. Alarms should sound.
B. Close main drain.
C. Slowly drop air pressure in system through system priming valve until air compressor cycles automatically. If compressor does not cycle above 22 psi check electrical pressure switch on compressor for proper functioning.
D. Compressor should return system pressure to pre-determined pressure setting.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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Wednesday, March 21, 2012
DRY-PIPE PROCEDURES Part 1
I. PREVENTIVE MAINTENANCE:
1. Monthly inspect the main control valve.
i. It should open and close smoothly. Leave fully open.
ii. The monitor switch plunger should be left seated in the valve stem indent.
NOTE: Tamper alarms will sound when the valve is moved from fully open. They will cease when the valve is again fully open.
2. Monthly inspect the monitor switch.
i. Close the control valve 2 turns and verify operations of the appropriate alarms.
ii. Re-open the control valve 2 turns and such that the switch plunger is seated in the indent and verify operation of the cessation of alarms.
3. Monthly inspect all trim valves.
i. Main drain should be closed.
ii. Gauge valves should be open.
iii. Alarm control valve should be open.
iv. Priming water is sufficient in dry pipe valve to seal clapper (approximately 3” above clapper.)
v. Air pump is lubricated and tank drained of condensation if applicable.
vi. Low point drains should be cleared of all condensations.
4. Monthly inspect the Fire Department Connection.
i. Remove caps and verify that the waterway is clean and clear, the clapper swings freely, and the threads are in good condition. Replace caps.
ii. Verify that the ball drip is in working order.
iii. Verify that the check valve is not leaking.
5. Quarterly inspect the sprinklers.
i. Sprinklers should be free from corrosion, foreign materials, paint, and other obstructions to discharge.
ii. Sprinklers should not be bent or damaged in any way.
iii. A complete stock of spare sprinklers and a sprinkler wrench should be available.
6. Semi-annually inspect all the pipe and hangers.
i. Piping and hangers should be in good condition and free from mechanical injury.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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1. Monthly inspect the main control valve.
i. It should open and close smoothly. Leave fully open.
ii. The monitor switch plunger should be left seated in the valve stem indent.
NOTE: Tamper alarms will sound when the valve is moved from fully open. They will cease when the valve is again fully open.
2. Monthly inspect the monitor switch.
i. Close the control valve 2 turns and verify operations of the appropriate alarms.
ii. Re-open the control valve 2 turns and such that the switch plunger is seated in the indent and verify operation of the cessation of alarms.
3. Monthly inspect all trim valves.
i. Main drain should be closed.
ii. Gauge valves should be open.
iii. Alarm control valve should be open.
iv. Priming water is sufficient in dry pipe valve to seal clapper (approximately 3” above clapper.)
v. Air pump is lubricated and tank drained of condensation if applicable.
vi. Low point drains should be cleared of all condensations.
4. Monthly inspect the Fire Department Connection.
i. Remove caps and verify that the waterway is clean and clear, the clapper swings freely, and the threads are in good condition. Replace caps.
ii. Verify that the ball drip is in working order.
iii. Verify that the check valve is not leaking.
5. Quarterly inspect the sprinklers.
i. Sprinklers should be free from corrosion, foreign materials, paint, and other obstructions to discharge.
ii. Sprinklers should not be bent or damaged in any way.
iii. A complete stock of spare sprinklers and a sprinkler wrench should be available.
6. Semi-annually inspect all the pipe and hangers.
i. Piping and hangers should be in good condition and free from mechanical injury.
The above information is provided as a courtesy and is not intended to replace the outlined procedures as given in NFPA 24. It is the owner’s responsibility to follow the outlined procedures in NFPA 24.
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Tuesday, March 20, 2012
DRY AUXILLARY DRUM-DRIP DRAINAGE PROCEDURES
The following procedure is to be followed:
ANNUALLY PRIOR TO FREEZING WEATHER, AND AS NEEDED DURING THE FREEZING SEASON
1) Close Number 1 Valve.
2) If present, remove plug from Number 2 Valve.
3) Ready a container large enough to handle the waste water (preferably a 5 gallon bucket).
4) Place container directly under valve outlet on Number 2 Valve.
5) Fully open Number 2 Valve and allow for complete draining.
6) Repeat steps 3 through 5 until no waste water is present.
7) After all waste water has been removed form drum-drip, close Number 2 Valve.
8) Replace plug.
9) Open Number 1 Valve.
10) The drainage procedure is now complete.
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ANNUALLY PRIOR TO FREEZING WEATHER, AND AS NEEDED DURING THE FREEZING SEASON
1) Close Number 1 Valve.
2) If present, remove plug from Number 2 Valve.
3) Ready a container large enough to handle the waste water (preferably a 5 gallon bucket).
4) Place container directly under valve outlet on Number 2 Valve.
5) Fully open Number 2 Valve and allow for complete draining.
6) Repeat steps 3 through 5 until no waste water is present.
7) After all waste water has been removed form drum-drip, close Number 2 Valve.
8) Replace plug.
9) Open Number 1 Valve.
10) The drainage procedure is now complete.
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Monday, March 19, 2012
Figuring Pressure / K Factor / GPM
P = (Q/K)2
K = Q/sqrtP
Q = K*sqrtP
Where:
P = Pressure
Q = GPM
K = K Factor
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K = Q/sqrtP
Q = K*sqrtP
Where:
P = Pressure
Q = GPM
K = K Factor
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Friday, March 16, 2012
Specific Gravity
The Specific Gravity - SG - is a dimensionless unit defined as the ratio of density of the material to the density of water at a specified temperature. Specific Gravity can be expressed as
SG = ρ / ρH2O (3)
where
SG = specific gravity
ρ = density of fluid or substance (kg/m3)
ρH2O = density of water (kg/m3)
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SG = ρ / ρH2O (3)
where
SG = specific gravity
ρ = density of fluid or substance (kg/m3)
ρH2O = density of water (kg/m3)
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Thursday, March 15, 2012
Safety Pressure Remaining
To figure how much pressure is remaining in your hydraulic calculations use the following formula:
RP/AP = SP
1-SP = % Remaining
RP = Required Pressure
AP = Available Pressure
SP = Safety Pressure
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RP/AP = SP
1-SP = % Remaining
RP = Required Pressure
AP = Available Pressure
SP = Safety Pressure
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Tuesday, March 13, 2012
Volume of Water Per Foot of Pipe
To figure the Volume of Water Per Foot of Pipe use the following formula:
p (.5R)2 * 1 (one foot of pipe) * 7.47 (volume of H2O per gallon)
Where:
p = 3.142
R = Inside diameter of pipe (convert to decimal inches)
i.e.I.D. of 1” Sch. 40 = 1.049
1.049 / 12 = .08742
Example:
Volume of 1’ of Sch. 40 pipe =
p (.5 * .08742)2 * 1 * 7.47 = .0448
.045 Rounded to nearest hundred
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p (.5R)2 * 1 (one foot of pipe) * 7.47 (volume of H2O per gallon)
Where:
p = 3.142
R = Inside diameter of pipe (convert to decimal inches)
i.e.I.D. of 1” Sch. 40 = 1.049
1.049 / 12 = .08742
Example:
Volume of 1’ of Sch. 40 pipe =
p (.5 * .08742)2 * 1 * 7.47 = .0448
.045 Rounded to nearest hundred
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Monday, March 12, 2012
Dedicated Electrical Space
When it comes to fire sprinkler design in regard to electrical spaces there always seems to be some confussion. Here is some information that may help:
NEC Article 110.26(F)(1)(a).
Dedicated Electrical Space.
The space equal to the width and depth of the equipment and extending from the floor to a height of 1.8 m (6 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. No piping, ducts, leak protection apparatus, or other equipment foreign to the electrical installation shall be located in this zone.
Exception:
(a) Suspended ceilings with removable panels shall be permitted within the 1.8-m (6-ft) zone.
(b) Foreign Systems. The area above the dedicated space required by
110.26(F)(1)(a) shall be permitted to contain foreign systems, provided protection is installed to avoid damage to the electrical equipment from condensation, leaks, or breaks in such foreign systems.
(c) Sprinkler Protection. Sprinkler protection shall be permitted for the dedicated space where the piping complies with this section.
(d) Suspended Ceilings. A dropped, suspended, or similar ceiling that does not add strength to the building structure shall not be considered a structural ceiling.
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NEC Article 110.26(F)(1)(a).
Dedicated Electrical Space.
The space equal to the width and depth of the equipment and extending from the floor to a height of 1.8 m (6 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. No piping, ducts, leak protection apparatus, or other equipment foreign to the electrical installation shall be located in this zone.
Exception:
(a) Suspended ceilings with removable panels shall be permitted within the 1.8-m (6-ft) zone.
(b) Foreign Systems. The area above the dedicated space required by
110.26(F)(1)(a) shall be permitted to contain foreign systems, provided protection is installed to avoid damage to the electrical equipment from condensation, leaks, or breaks in such foreign systems.
(c) Sprinkler Protection. Sprinkler protection shall be permitted for the dedicated space where the piping complies with this section.
(d) Suspended Ceilings. A dropped, suspended, or similar ceiling that does not add strength to the building structure shall not be considered a structural ceiling.
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Saturday, March 10, 2012
Engineering vs Design Part 3
In the State of Idaho, the layout of automatic sprinkler systems has been left in the charge of the fire sprinkler contractor for many years. In all these years, I am not aware of even one catastrophic failure, or for that matter even a small failure, of a fire sprinkler system due to the layout being performed improperly. This is not to say that contractors are perfect, we are just like engineers we all make mistakes. Over the years, through the proper training and education of the Fire Sprinkler Contractor, the industry has provided a very reasonable level of protection to both life and property. I encourage the continued practice of qualified licensed Fire Sprinkler Contractors and their personnel to perform the layout of the fire sprinkler systems. I also support a similar Advisory passage such as the one that the State of Texas Board of Engineers has passed.
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Friday, March 9, 2012
Engineering vs Design Part 2
The layout of fire sprinkler systems is not engineering and it is to be performed by qualified individuals who have demonstrated a level of proficiency as deemed acceptable to the board. In the case of Texas this is an individual that is certified to a minimum Level III, in the subfield of "Automatic Sprinkler Systems Layout", through the National Institute for Certification in Engineering Technologies (NICET);. It is very important to note, as well, that when Texas mentions the role and responsibility of the engineer that they use the phrase, “Competent in Fire Protection Engineering”. We all know that a doctor is not always a doctor. A horse doctor can not perform brain surgery any more than an unqualified engineer can perform fire sprinkler layout in a competent manner. I’m not trying to bash engineers, but instead simply making the point that just because an individual has a PE after their name, it does not make them qualified to practice outside of their field of expertise. This has been a very real issue over the past several years as more and more unqualified mechanical PE’s have been dabbling in the fire protection field.
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Thursday, March 8, 2012
Engineering vs Design
NFPA 13 provides me with the purpose of my profession, Fire Sprinkler Design. As stated in chapter one, “The purpose of this standard is to provide a reasonable degree of protection for life and property from fire through standardization of design, installation, and testing requirements for sprinkler systems… based on sound engineering principles, test data, and field experience…” By the purpose given in NFPA 13, it is clear that the engineering has been taken out of the layout process because it has been soundly built into the standard. The standard in several places even admonishes the layout technician to consult a professional engineer when it is necessary to deviate from the guidelines set forth in the standard. As a Fire Sprinkler Design layout technician I do not practice engineering. I very simply provide the layout for the sprinkler system based on the engineering principles that are built into the standard; which has been given as a standardized guideline so that the final outcome of all sprinkler systems is one that allows for a similar and reasonable degree of protection every time.
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Wednesday, March 7, 2012
DETERMINE WHAT BRACE ANGLE AND FIGURE WILL BE USED
Determine angle of attachment based on FIGURE 9.3.5.9.1
9.3.5.10.1 - Assembly attachment fittings shall be load rated
9.3.5.10.3 – Rated load shall be adjusted based on angle
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9.3.5.10.1 - Assembly attachment fittings shall be load rated
9.3.5.10.3 – Rated load shall be adjusted based on angle
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Tuesday, March 6, 2012
MAXIMUM HORIZONTAL LOADS
l / r = 200
Brace schedule / size = Sch 40 / 1”
Brace length = 7’0”
Brace Angle = 45°– 59°
Max load = 1735 lbs
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Brace schedule / size = Sch 40 / 1”
Brace length = 7’0”
Brace Angle = 45°– 59°
Max load = 1735 lbs
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Monday, March 5, 2012
Longitudinal Sway Bracing
Not subject to Table 9.3.5.3.2 (a & b)
9.3.5.4.1 - Space to max of 80’
9.3.5.4.3 - The last brace shall be no more than 40’ from the end of the pipe
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9.3.5.4.1 - Space to max of 80’
9.3.5.4.3 - The last brace shall be no more than 40’ from the end of the pipe
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Sunday, March 4, 2012
LATERAL SWAY BRACING PART 2
Table 9.3.5.3.2 (a & b)
Pipe (in.) =
Pipe size being braced
Spacing =
Max interval & max weight per brace
Interpolation between lengths is allowed w/ a detailed engineering analysis
In no case may the brace exceed 40’
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Pipe (in.) =
Pipe size being braced
Spacing =
Max interval & max weight per brace
Interpolation between lengths is allowed w/ a detailed engineering analysis
In no case may the brace exceed 40’
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Saturday, March 3, 2012
LATERAL SWAY BRACING
9.3.5.3.1 - All feed and cross mains regardless of size and branch lines 2-1/2” and greater
9.3.5.3.2 – See Table 9.3.5.3.2 (a & b)
9.3.5.3.3 – Lateral Sway Brace not required on 2-1/2” starter pieces 12’ or less in length
9.3.5.3.4 – The last brace shall be no more than 6’ from the end of the last piece of pipe
9.3.5.3.5 – The last length of pipe shall have a lateral brace
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9.3.5.3.2 – See Table 9.3.5.3.2 (a & b)
9.3.5.3.3 – Lateral Sway Brace not required on 2-1/2” starter pieces 12’ or less in length
9.3.5.3.4 – The last brace shall be no more than 6’ from the end of the last piece of pipe
9.3.5.3.5 – The last length of pipe shall have a lateral brace
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Friday, March 2, 2012
Structural Components & Sway Bracing
NFPA 13
9.3.5.1.2
The Structural Components to which bracing is attached shall be determined to be capable of resisting the added seismic loads.
This is not normally in the scope of Fire Sprinkler Contractors Work, but it does need to be verified that the Structural Engineer has taken this additional load into account.
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9.3.5.1.2
The Structural Components to which bracing is attached shall be determined to be capable of resisting the added seismic loads.
This is not normally in the scope of Fire Sprinkler Contractors Work, but it does need to be verified that the Structural Engineer has taken this additional load into account.
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Thursday, March 1, 2012
NFPA 13 UG STUB-IN
NFPA 13, 2013 edition
6.3.1.1.1* Underground pipe shall be permitted to extend into the building through the slab or wall not more than 24 inches.
A.6.3.1.1.1 Extending the underground into a building provides working room to transition to the appropriate above ground piping. Environmental conditions should be considered as outlined in 23.1.6.1.2
posted by www.firebyknight.com
6.3.1.1.1* Underground pipe shall be permitted to extend into the building through the slab or wall not more than 24 inches.
A.6.3.1.1.1 Extending the underground into a building provides working room to transition to the appropriate above ground piping. Environmental conditions should be considered as outlined in 23.1.6.1.2
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