Nfpa 13 underground piping. pdf) or read online for free.
Nfpa 13 underground piping. (25 mm) through 31⁄2 in.
Nfpa 13 underground piping 1 specifies that stainless steel pipe must meet the requirements in ASTM A312/312M, with commentary otherwise specifying “Both coating and wrapping are required when internally galvanized steel pipe is used underground between an exterior fire department connection and the check valve a 6” pipe, 1560 GPM (5905 L/min) for an 8” pipe, 2440 GPM (9235 L/min) for a 10” pipe, and 3520 GPM (13323 L/min) for a 12” pipe. This is an intermittent test, once temperatures allow a hydrostatic test Where piping installed in a private fire service main must be installed above grade, the piping materials shall conform to NFPA 13. Underground Piping for Fire Sprinkler Service (2019) Reference: 2016 NFPA 13, Chapters 10 & 23; 2016 NFPA 24, Sections 10. However, if there is a fire pump in the system, the flushing rate for the pump supply piping is required to meet 15 fps and the flow rate needs to be at least 150 percent of the rated capacity of the fire pump. 24. Klaus,2015 Operation of Fire Protection Systems Arthur E. Cote,2003 Fire Science FESHE NFPA 24 Standard for the Installation of Private Fire Service Mains and Their Appurtenances National Fire Protection Association,2018-08-20 Cement-Mortar Lining for Ductile-Iron Pipe and Fittings: AWWA C104/A21. (100 mm) and Larger: AWWA C602: Plastic : Polyvinyl Chloride (PVC) Pressure Sep 5, 2022 · NFPA 13, Standard for the Installation of Sprinkler Systems, 2019 ed. Insulation - Piping covered by insulation, as shown in the detail below is considered part of the area below the ceiling and not part of the unheated attic area. [NFPA 54:7. SCOPE This guideline is applicable to all private underground piping for hydrants and/or sprinkler supply lines within the City of Redlands, Redlands Fire Department (RFD). §6. With Q. Submit one certification for each system. 4. Ferrous Metal System Components May 17, 2022 · The sleeve would be required anywhere "Piping is Subject to Damage Due to Earthquakes" per Section 9. B. 25. txt) or read online for free. NFPA 13/24, 10. 2. (90 mm), and the clearance provided by a pipe sleeve of nominal diameter 4 in. 1 shall not preclude the bonding of the underground piping to the lightning protection grounding system as required by NFPA 780 in those cases where lightning protection is provided for the structure. Hydrostatic: Hydrostatic tests shall be made at not less than 200 psi (13. Utilize the top and left-side panel tools to modify Contractors material and test certificate for underground piping. 8. Dec 9, 2021 · From 13R 2016 ed: 6. 1 Piping manufactured in accordance with Table 10. or flow indicator dry valve q. 5: Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings: AWWA C111/A21. 1] the underground piping. . All ductile iron, retaining rods, and As per 2007 edition, 8. 3] Underground Piping for Fire Sprinkler Service (2022) Reference: 2022 NFPA 13, 2019 NFPA 24,and SFFD Administrative Bulletin 4. 4: Polyethylene Encasement for Ductile-Iron Pipe Systems: AWWA C105/A21. 8 bars) for two hours or 50 psi (3. a 6” pipe, 1560 GPM (5905 L/min) for an 8” pipe, 2440 GPM (9235 L/min) for a 10” pipe, and 3520 GPM (13323 L/min) for a 12” pipe. 1 Does the water appear to flow smoothly without evidence of a possible obstruction? Check burlap bags for stones, rocks, etc. Permit . Aug 3, 2017 · Unless permitted by 24. ☐ L/min) for 6-in. O. 4 bar) above The nfpa 13 contractor's material and test certificate for underground piping isn’t an any different. Underground Fire Protection Piping Testing Requirements All testing requirements shall comply with NFPA 13 Chapter 10 and NFPA 24. 15: Thickness Design of The requirement of 10. pipe, 2440 gpm for 10-in pipe, and 3520 gpm for 12-in. 17. There are provisions in 13 and 13R that are in place for running pipe underwound (see above). Before performing flush tests, inquire about the status of the underground to verify “jumpers” have been removed. The system design shall comply with NFPA 13 and NFPA 24 (see Sections 1 through 3 above) when: 1) Serving more than one R-1, R-2, or R-4 occupancy, or Reference: 2016 NFPA 13, Chapters 10 & 23; 2016 NFPA 24, Sections 10. Code (CBC), and the 2019 editions of NFPA 24, NFPA 13, NFPA 13R, and locally adopted amendments to these codes. Reference: 2022 NFPA 13, 2019 NFPA 24,and SFFD Administrative Bulletin 4. 4 bars) above static Apr 21, 2020 · Check out NFPA 13-17 24. Clarification was added that once a sprinkler is removed from a fitting or welded outlet it should not be reinstalled if torque was applied to the sprinkler itself. o. 8 bar) for 2 hours or 50 psi (3. 15: Thickness Design of Cement-Mortar Lining for Ductile-Iron Pipe and Fittings: AWWA C104/A21. 1 & 29. Developing this high velocity in the piping network while flushing is necessary for cleaning the pipe and lifting foreign material to an Jul 31, 2020 · NFPA 24 requires a minimum flow rate from underground pipe in order to remove rock and debris from the underground pipe. 3) provides the minimum required flow rates required for a pipe flow velocity of 10 feet/second. Cote,2003 Fire Science FESHE 18106-13 A. 1 are still employed. NFPA 13 10. (600 mm). Determination of whether or not this requirement is met shall be at the sole discretion of the Fire Marshal. Aboveground pipe and fittings shall comply with the applicable sections of Chapters 6 and 8 of NFPA 13, Standard for the Installation of Sprinkler Systems, that address pipe, fittings, joining methods, hangers, and installation. Hydrostatic Hydrostatic tests shall be made at not less than 200 psi (13. NFPA 24 – 10. bNFPA 13 only requires 60-second limitation in specific sections. Galvanized pipe is not allowed unless used for the FDC riser and wrapped with 30mil tape. 1 of NFPA 13, 14 & 24 for list of required piping with product specifications for Underground piping or any pipe with FM Approval for utilising in fire systems as Underground pipes. 4. Underground piping, from the water supply to the system riser, and lead-in connections to the system riser shall be completely flushed before connection is made to downstream fire protection system piping. Jan 10, 2017 · NFPA 13/24, 10. The 2009 IFC references the 2007 edition of NFPA 13. 1] 13) Underground piping, from the water supply to the system riser, and lead-in connection to the system riser, including all hydrants, shall be flushed before the connection is made to downstream fire protection piping [NFPA 24, 10. UNDERGROUND PIPING A. Although not required by NFPA 13, some water purveyors may require the use of backflow preventers to stop water from the private system flowing back into the public supply. owner/owner’s agent (b) FSSW. Page . Ductile Iron and Gray Iron Fittings, 3 in. 1* Buried Fittings 10. 7 %âãÏÓ 1 0 obj > /ExtGState > /Font > /XObject 35404 0 R /ProcSet [/PDF /Text] >> /Parent 32431 0 R /MediaBox [0 0 612 792] /CropBox [0 0 612 792] /BleedBox [0 0 612 792] /Annots [2685 0 R 35407 0 R 37825 0 R] /Rotate 0 /Contents 37824 0 R /Group > >> endobj 2 0 obj > stream gÉEr•«Þ×?ñèÊnܹÚ@u ñg. 1 of 3 Trip point air pressure Fire Sprinklers (NFPA 13) – Guidelines & Specifications Fire Prevention Guideline P-04 NORTHSTAR FIRE DEPARTMENT • 910 NORTHSTAR DRIVE, TRUKEE, A 96161 • PAGE 2 OF 10 11/21 If installed piping is six (6) inches or larger, structural load calculations will be required for the structural elements/systems supporting the load. The requirement of 10. 1] Connections to the city Water main are dictated by the water purveyor. 3 shall not apply where the fire department connection is connected to the underground piping. 1 The requirement of 10. 2 through 24. Cote,2003 Fire Science FESHE NFPA 24 Standard for the Installation of Private Fire Service Mains and Their Appurtenances National Fire Protection Association,2018-08-20 Nfpa 13 Underground Piping Automatic Sprinkler Systems Handbook Matthew J. 1: Underground piping, from the water supply to the system riser, and lead-in connections to the system riser shall be completely flushed before connection is made to downstream fire protection system piping. SCOPE Prestressed Concrete Pressure Pipe, Steel-Cylinder Type: AWWA C301: Reinforced Concrete Pressure Pipe, Non-Cylinder Type: AWWA C302: Reinforced Concrete Pressure Pipe, Steel-Cylinder Type, Pretensioned: AWWA C303: Cement-Mortar Lining of Water Pipe Lines in Place, 4 in. ‰ÃO^²! ÿ* ?âü kb£¼¾ñZ õµnI›|£t ©Ù ` –AD·òÅ è ~âe Nfpa 13 Underground Piping eBook Subscription Services Nfpa 13 Underground Piping Budget-Friendly Options 6. pipe, and 3520 gpm (13,323 L/min) for 12-in. make model Contractor’s Material and Test Certificate for Aboveground Piping . Yes No Other, explain NFPA 13 and shall indicate site’s Cp value to determine sway brace loads with credible source, maximum spacing between braces, maximum pipe length, and pipe schedule used installation. Underground Service for NFPA 13R Systems Underground service shall comply with one of the following designs based upon the parameters described: 4. 2007, NFPA 13, Section 10. The following table is compiled from NFPA 13/NFPA 24 and NFPA 20 requirements: %PDF-1. pipe. Flush at flows not less than 390 gpm for 4-in. D. SCOPE contractor’s material & test certificate for underground piping Procedure Upon completion of work, inspection and tests shall be made by contractor’s representative and witnessed by an owner’s representative. [24:10. A visual inspection of appropriate gauge reading shall be witnessed by the Fire Inspector. 6; and SFFD Administrative Bulletin 4. When supply cannot produce stipulated flow rates, obtain maximum available. of . 6. CPVC underground piping is prohibited by SFPUC. Nfpa 13 Underground Piping NFPA 24 Standard for the Installation of Private Fire Service Mains and Their Appurtenances National Fire Protection Association,2018-08-20 Operation of Fire Protection Systems Arthur E. 1 the amount of water shall be measured and shall not exceed the limits of Table 10. 15: Thickness Design of [1] NFPA 13 (2016 edition) Section 10. Chapter 24 – Water supplies The requirement of 10. Many of the underground contractors simply open up the pipe and wait until there's consistent clear water and/or stop hearing the rocks ping around. 4 bars) above static The requirement of 10. 11: Flanged Ductile-Iron Pipe with Ductile-Iron or Gray-Iron Threaded Flanges: AWWA C115/A21. 3; see specifically section 9. 3] on all underground plans that use thrust blocks as the restraining method. In this online training course from NFPA, learn about requirements for underground piping installations, including water supplies, fittings, and connections. This In addition, underground plastic piping shall be installed with sufficient clearance or shall be insulated from any source of heat so as to prevent the heat from impairing the serviceability of the pipe. 15: Thickness Design of Drain test—Residual pressure with valve in test pipe open wide: _____ psi (bar) Underground mains and lead-in connections to system risers flushed before connections made to sprinkler piping Verified by copy of the U Form No. 3* Protection of Piping in Hazardous Areas. 4 of NFPA 13 (2016) which is where this requirement originates. This guideline applies to all private underground piping for hydrants and/or sprinkler supply lines within the City of Murrieta when the regulatory authority is Murrieta Fire NFPA 13, 2019. NOTE: Sections 6 and 7(B) thru (D) are NOT APPLICABLE for 4 inch or less underground pipes serving NFPA 13R and 13D systems ONLY. Make changes to the sample. Fire Sprinkler Head Installation Details shall be provided for any special clearance considerations for field inspection staff. 1 and 25. pipe, 1560 gpm (5905 L/min) for 8-in. 8 bar) and shall maintain that pressure without loss for 2 hours. yesnew underground piping flushed according to nfpa-24 standard no by (company) if no, explain : how flushing flow was obtained through what type opening flushing tank or reservoir fire pumppublic water hydrant butt open pipe tests nolead-ins flushed according to nfpa-24 standard yes by (company) Underground Service for NFPA 13R Systems Underground service shall comply with one of the following designs based upon the parameters described: A. The 1999 edition contained information on the installation of underground pipe from NFPA 24 and sprinkler system discharge criteria for on-floor and rack storage of Class I, II, III, IV, and plastic commodities, shall be performed in accordance with NFPA 13, NFPA 24, and Moreno Valley Fire Prevention Bureau Guideline requirements. Concealment of any construction or piping shall not be permitted until system has undergone overhead rough piping and other required testing by Fire Prevention Bureau Staff. 4 then says the requirements of 8. 8 shall not preclude the bonding of the underground piping to the lightning protection grounding system as required by NFPA 780 in those cases where lightning protection is provided for the structure. for Fire Sprinkler Systems NFPA 13 NOTES for Underground Piping/Supply Line for Fire Sprinklers (NFPA 13) (All of the notes listed below shall be placed, verbatim, on the plan under the heading “NFD NOTES”) INSPECTION REQUIREMENTS 1. pdf), Text File (. NFPA 13 • Dry pipe system • Pre-action system • Listed dry pendent, dry upright, or dry sidewall sprinklers extended from pipe in heated areas • Heat tracing ☐ 18. 4 Depth of Cover 10. Created: May 9, 2019 Revised: November 15, 2023 Effective Date: Immediate Community Risk Reduction Division – 928-204-8926 . Code (CBC), and the 2022 editions of NFPA 24, 2022 NFPA 13, 2022 NFPA 13R, including California State amendments, and locally adopted amendments to these codes. The system design shall comply with NFPA 13 and NFPA 24 (see Sections 1 through 3 above) when: 1) Serving more than one R-1, R-2, or R-4 occupancy, or 3. d. 8 All tees, plugs, caps, bends, reducers, valves, and Cement-Mortar Lining for Ductile-Iron Pipe and Fittings: AWWA C104/A21. Nonmetallic piping compatibility language was updated for consistency with NFPA 13. 2 says the FDC shall be on the system side of system control, check and alarm valves (wet systems). Depth of cover shall be a minimum of 54 inches above the pipe as per the frost line map in NFPA Chapters 13 & 24. 1 shall be permitted to be used. pipe, 880 gpm for 6-in. Use this form to provide results and certify the underground piping testing performed. This guideline is applicable to all private underground piping for hydrants and/or sprinkler supply lines within Iron Water Mains and Their Appurtenances, AWWA M9, Concrete Pressure Pipe, AWWA M23, PVC Pipe — Design and Installation, or AWWA M55, PE Pipe — Design and Installation, as long as the test pressure and test duration requirements of 6. pipe, 1560 gpm for 8-in. - NFPA 13 permits unprotected cast-iron or ductile-iron where jointed with gasketed joint for air service underground Aug 16, 2023 · NFPA 13: 29. Use of newer editions of NFPA 13 is acceptable as long as the design meets or exceeds the requirements of the referenced 2007 edition. California Building Code (CBC), and the latest adopted editions of NFPA 24, NFPA 13, NFPA 13R referenced in Chapter 80 of the CFC, and locally adopted amendments to these codes. NFPA 13 1999 edition encompasses both underground and aboveground and addresses the test methods. Cement-Mortar Lining for Ductile-Iron Pipe and Fittings: AWWA C104/A21. 4 & 10. Nfpa 13 Underground Piping Operation of Fire Protection Systems Arthur E. 2: Water: 200psi / 14 bar for 2 hours [120 minutes] Zero Drop determined by gauge pressure or visual leakage: NFPA 13 & 29. Reply. 3). 1* Underground piping shall be permitted to extend into the building through the slab or wall not more than 24 in. 2 requires a hydrostatic test per NFPA 13-1999. (50 mm) larger than the nominal diameter of the pipe shall be acceptable for pipe sizes 1 in. Flushing rates for fire protection underground shall be in accordance with NFPA 13. pipe types and class type joint pipe conforms to nfpa-24 standard no yes underground fittings conform to nfpa-24 standard yes no pipes if no, explain and joints joints needing anchorage clamped, strapped, or blocked in yes no accordance with nfpa-24 standard if no, explain test description flushing. 1 for more information. 4 Brazed and Pressure Fitting Methods 10. 23. 1 forbids pipe to be run under buildings. 3] a gauge pressure of 200 psi for 2 hours [NFPA 24, 10. Section 10. 1 Buried Joints 10. This document provides guidelines for the design and installation of underground piping and supply lines for fire sprinklers and hydrants according to NFPA When the underground piping can be supplied or pressurized by a Fire Department Connection (FDC), the underground piping shall be designed to withstand a working pressure of not less than 200 psi (for example, Class 305PVC), or 50 psi greater than the system design pressure whichever is greater. 2. 4 Where steel pipe is used underground, the pipe shall be protected against corrosion. 1 of 3 Trip point air pressure Cement-Mortar Lining for Ductile-Iron Pipe and Fittings: AWWA C104/A21. Check which type of inspection completed: ☐ NFPA 13 ☐ NFPA 13R 5 Underground mains and lead in connections to system risers flushed before connection made to sprinkler piping Verified by copy of the Contractor’s Material & Test Yes No Certificate for Underground Piping. Use this form to provide results and certify the aboveground piping testing performed. 3. 6. 6 (as amended in SFFC Chapter 80); and SFFD Administrative Bulletin 4. Dec 8, 2009 · From the mechanical room, the sprinkler contractor wants to run piping underslab to feed the remainder of the units. 5. Drawings shall include but are not limited to, pipe hangar locations, riser location, riser detail, nodes, pipe sizes 3. Underground Service for NFPA 13R Systems Underground service shall comply with one of the following designs based upon the parameters described: A. Enhancing Your Reading Experience Contractor’s Material and Test Certificate for Underground Piping . Navigating Nfpa 13 Underground Piping eBook Formats ePub, PDF, MOBI, and More Nfpa 13 Underground Piping Compatibility with Devices Nfpa 13 Underground Piping Enhanced eBook Features 7. Jan 11, 2019 · Please check Table - 10. 1] CRR POLICY 1306: NFPA 13 R SPRINKLER SYSTEM REQUIREMENTS . If no, explain aMeasured from time inspector's test connection is opened. 1 NFPA 13/24, 10. 10. 2 permits this installation if the pipe is in covered trenches and valved to isolate the pipe. Jul 9, 2019 · If the pipe qualifies as underground pipe, section 6. All NFPA 13 and 13R fire sprinkler systems serving commercial or multi-family structures shall be fed by a minimum of 6” ductile iron underground fire main Nfpa 13 Underground Piping Operation of Fire Protection Systems Arthur E. 12. NFPA 25 Yes No Location of system Orifice size Quantity Type Model Water Pressure Air pressure Minutes Seconds psi psi Minutes Seconds Yes No Without Q. Where necessary to place pipe that will be under air pressure underground, the pipe shall be protected against corrosion. 1 Aboveground piping for private fire service mains shall not pass through hazardous UNDERGROUND PIPING A. 8, all piping and attached appurtenances subjected to system working pressure shall be hydrostatically tested at 200 psi (13. pipe, 2440 gpm (9235 L/min) for 10-in. §10. 3. Size of underground pipe, including pipe material and fitting being used. Method of Joint Restraint. revised to address mixed-use buildings and the applicability of NFPA 13R systems. Inspection Requirements 22) Visual: All underground piping, joints, and thrust blocks must be uncovered and exposed, with labeling of the pipe legible from grade. All underground sprinkler supply piping shall be included on civil drawings and shall be approved by the water supplier and the Marysville Fire District (MFD). The scope of NFPA 13 was expanded to address all sprinkler system applications. A larger point is that why would you want to squeeze the underground piping from 4" to 3 21) The pipe size and arrangement of the FDC should conform to the latest edition of NFPA 13, Standard for the Installation of Sprinkler Systems. nfpa 25 yes no location supplies building: of system make model year of manufacture orifice size quantity temperature rating sprinklers pipe and fittings per nfpa 13 type of pipe: type of fittings: alarm device maximum time to operate thru test connection alarm valve type makemodelmin. 4 Is the water main valve fully opened? If inadequate flow is evident during the test, it may be necessary to verify if other water main valves are closed. 1 Where necessary to place pipe that is under air pressure underground, the pipe shall be protected against corrosion. sec. Sprinkler plans shall provide underground pipe details showing new underground fire service or mains that include ALL of the following: 1. 2 Protection of Piping. Unprotected cast-iron or ductile-iron pipe shall be permitted where joined with a gasketed joint listed for air service underground. SCOPE . An eDocument can be regarded as legally binding given that specific needs are met. Cote,2003 Fire Science FESHE Automatic Sprinkler Systems Handbook National Fire Protection Association,2018-12-14 May 15, 2020 · - NFPA 13 permits this FDC feed to be galvanized steel, but does not mandate any pipe type for this application (NFPA 13-2019 10. As best I can tell NFPA 13R does not have similar provisions, although the reasoning for not routing underneath is the same (pipe can become compromised by building settling, leakage is extremely Type of Pipe. 17. pdf) or read online for free. Address: informati. Feb 6, 2019 · NFPA 13 has clear requirements which do not encourage pipe to be routed underneath buildings (NFPA 13 2016 Section 10. 1 The system design shall comply with NFPA 13 and NFPA 24 (see Sections 1 through 3 above) when: pipe types and class type joint pipe conforms to nfpa-24 standard no yes underground fittings conform to nfpa-24 standard yes no pipes if no, explain and joints joints needing anchorage clamped, strapped, or blocked in yes no accordance with nfpa-24 standard if no, explain test description flushing. 3 / 2019 Section 6. 85B Yes No Other Flushed by installer of underground sprinkler piping Yes No Other If other, explain. 9. 8 bar for 24 hours. Underground piping, from the water supply to the system riser, and lead-in connections to the system riser, including all hydrants, shall be completely flushed before connection is made to downstream fire protection system piping. Code Compare. Cote,2003 Fire Science FESHE NFPA 24 Standard for the Installation of Private Fire Service Mains and Their Appurtenances National Fire Protection Association,2018-08-20 NFPA 13 Sprinkler Underground Piping Paperwork (PDF) - Free download as PDF File (. A minimum of three NFD inspections are required for underground piping serving sprinkler systems and/or private The design and installation of private hydrant and/or sprinkler supply underground piping must be in accordance with the provisions of the 2022 California Fire Code (CFC), the 2022 California Building Code (CBC), and the 2019 editions of NFPA 24, and 2022 NFPA 13, NFPA 13R, and locally adopted amendments to these codes. 2 Fittings. 3 Where clearance is provided by a pipe sleeve, a nominal diameter 2 in. 3 (NFPA 13 2016 ed. Iron Water Mains and Their Appurtenances, AWWA M9, Concrete Pressure Pipe, AWWA M23, PVC Pipe — Design and Installation, or AWWA M55, PE Pipe — Design and Installation, as long as the test pressure and test duration requirements of 6. [NFPA 13-10: 24. MIKE. Mar 11, 2009 · Yes, as the definition of a sprinkler system is both aboveground and underground pipe (13R Section 1-3 Definitions, an integrated network of pipe) and 2-1. (100 mm) larger than the nominal diameter of the pipe Nfpa 13 Underground Piping Operation of Fire Protection Systems Arthur E. Where steel pipe is used underground, the pipe shall be protected against corrosion. 10. This is to ensure flushing routine does not impair or negate bacteria testing required by the utilities department. SCOPE. 6, which are based upon the following equation L = SD √ P L = testing allowance (makeup water), in gallons per hour Nfpa-13 - Underground Piping Popular sub categories. 2 and 8. All NFPA 13 and 13R fire sprinkler systems serving commercial or multi-family structures shall be fed by a minimum of 6” ductile iron underground fire main underground piping in accordance with the 2012 Rhode Island Uniform Fire Code (RIUFC), 2010 NFPA 24, 2010 NFPA 13, 13D, 13R and locally adopted amendments to these codes. 2 Underground piping Hydrostatic test per NFPA 25 and flush at the hydraulically calculated water demand, but not less than 10 feet per second. 3] Click on New Document and select the file importing option: upload Contractors material and test certificate for underground piping from your device, the cloud, or a protected link. If the building moves during a seismic event, the space around the piping provided by the sleeve allows the piping to be independent from the The requirement of 10. 16. 15: Thickness Design of P20 - Underground Piping_Supply Lines for Fire Sprinklers NFPA 13 _ Hydrants – Guidelines _ Specifications - Free download as PDF File (. 1. Commentary states this approach is possible, but coating and wrapping would be necessary. 7. hydrant and/or sprinkler supply underground piping in accordance with the provisions of the 2019 California Fire Code (CFC), the 2019 California Building Code (CBC), and the 2016 editions of NFPA 24, NFPA 13, NFPA 13R, and locally adopted amendments to these codes. Handling it utilizing electronic means differs from doing this in the physical world. 1: Air: Where water can't be used due to ambient temperature and risk of freezing - 40psi / 2. (25 mm) through 31⁄2 in. Flushed by installer of underground sprinkler piping.
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