Fire protection piping and its fittings are chosen once in a building’s life, then stay hidden in ceilings or underground for decades. A wrong pipe material, joining method or corrosion strategy does not show on handover day. It shows years later as leaks or blocked sprinklers.
This guide covers materials, joining, hanging, corrosion, testing and submittals for Saudi projects.
Key takeaways
- The Saudi Fire Protection Code SBC 801 is the binding framework. NFPA 13 and NFPA 24 are technical references that the designer adopts and the project documents specify.
- Steel sprinkler pipe is usually made to ASTM A795, ASTM A53 or ASTM A135, in Schedule 10 or Schedule 40 wall thickness.
- CPVC pipe is listed for specific uses, such as wet light hazard systems inside buildings. It is not used in dry systems.
- Trapped oxygen and residual water are leading causes of corrosion. Microbiologically influenced corrosion (MIC) is a contributing factor to be assessed, not assumed.
- The SASO technical regulation for water network pipes excludes firefighting pipes and fittings, so check each product’s status on SABER by its customs code.
In this article
- The reference framework for fire networks in Saudi Arabia
- Steel fire protection piping: standards and schedules
- CPVC pipe: where it fits and its limits
- Underground mains: ductile iron and HDPE
- Joining methods and fittings
- Hangers, supports and seismic protection
- Corrosion and MIC
- Flushing and hydrostatic testing
- Submittals and SASO / SABER requirements
- Common mistakes with fire protection piping and fittings
- KDI and Victaulic from AZEIDK
- Frequently asked questions
- Conclusion
The reference framework for fire networks in Saudi Arabia
The binding reference for fire protection design is the Saudi Fire Protection Code SBC 801. The 2024 edition of the Saudi Building Code has been mandatory since 30 June 2025. Civil Defense oversees fire protection requirements, and facilities are licensed through the Salamah platform.
For pipe, fittings, hangers and testing details, designers normally use NFPA 13 (2025 edition) for aboveground sprinkler piping and NFPA 24 (2025 edition) for private underground fire mains. These are technical references; the code, the authority and the contract decide what applies. Our fire-fighting systems solutions cover these networks from design to supply and installation.
Steel fire protection piping: standards and schedules
Manufacturer submittals for steel sprinkler pipe refer to three main standards:
- ASTM A795: steel pipe made for fire protection use, welded or seamless, black or galvanized, usually in light-wall Schedule 10 or in Schedule 40.
- ASTM A53: general-purpose steel pipe. Schedule 40 is the common fire protection wall.
- ASTM A135: electric-resistance-welded (ERW) pipe in light walls such as Schedule 10.
Wall thickness is tied to the joining method. Cutting a thread removes wall, so NFPA 13 limits threaded joints to specific wall thicknesses unless a lighter pipe is listed for threading. That is why Schedule 10 is usually roll grooved or welded, while Schedule 40 is threaded, cut grooved or roll grooved.
| Item | Schedule 10 | Schedule 40 |
|---|---|---|
| Common standards | ASTM A795 or ASTM A135 | ASTM A53 or ASTM A795 |
| Usual joining | Roll groove and welding | Threading, cut or roll groove, welding |
| Weight and cost | Lighter and easier to hang | Heavier and can be threaded |
| What to check | Listed sizes and corrosion resistance ratio (CRR) | Pressure rating and thread type (NPT or BSP) |
The corrosion resistance ratio (CRR) rates a listed pipe against threaded Schedule 40 pipe as the 1.0 benchmark. Black or galvanized pipe is chosen by system type (see corrosion below).
CPVC pipe: where it fits and its limits
CPVC plastic pipe is listed for specific uses. It is not a general substitute for steel. The datasheet of one of the best-known CPVC products states a UL 1821 listing; use in light hazard NFPA 13 systems and in residential NFPA 13R and 13D systems; wet systems inside buildings only; and no listing for outdoor use. It gives a maximum working pressure of 175 psi at 65 °C and warns against use in any system with compressed air or other gases.
In the Saudi climate, roof voids and unconditioned spaces can exceed the listed temperature. Follow the installation manual for the solvent cement, hanger spacing, and the manufacturer’s list of chemically incompatible products.
Underground mains: ductile iron and HDPE
NFPA 24 (2025 edition) covers private fire service mains feeding hydrants and sprinkler systems. It accepts pipe made to the standards it lists, or pipe specifically listed for these mains and installed within its listing. Common underground choices are cement-lined ductile iron and high-density polyethylene (HDPE), which does not rust.
Restrain the pipe against thrust at bends and tees, set the burial depth, and detail the transition to the riser. With HDPE, use the actual internal diameter in the hydraulic calculation, since it differs from the nominal size.
Joining methods and fittings
| Joining method | Typical use | What to check |
|---|---|---|
| Threaded | Small sizes and sprinkler drops | Wall thickness allowed for threading, thread type and thread quality |
| Grooved | Mains, branch lines and risers | Listing of coupling and gasket, matching groove type, suitability for dry systems |
| Welded | Large mains and shop fabrication | Welder and procedure qualification, removal of cut-out discs (coupons) from inside the pipe |
| Flanged | Pump rooms and large valves | Flange standard and class matching the valve and pipe |
Rubber gasketed grooved fittings are tested to UL 213 for fire protection service. The coupling, fitting and gasket must belong to a system listed for the same pressure and pipe type. Grooved couplings come as rigid types that prevent movement and flexible types that allow limited movement at expansion joints or where the design calls for flexibility.
Pipe and fitting ratings must not be lower than the maximum working pressure at their location, including fire pump churn pressure. For valves and network components, see our guide to fire protection valves and network components.
Hangers, supports and seismic protection
NFPA 13 sets hanger types and spacing by pipe material and size, and requires hanger components to be listed or to meet its criteria. CPVC needs closer hanger spacing than steel, with support near sprinkler drops as the manufacturer’s manual requires.
Seismic protection is a different concept from ordinary hanging. It covers lateral and longitudinal sway bracing, flexible couplings across building joints, and clearance around pipes passing through walls. It applies where the structural design or specification calls for it.
Corrosion and MIC
An FM Global research report on corrosion in fire protection systems found that dissolved oxygen is the main driver of steel pipe corrosion. In wet systems, trapped air pockets feed corrosion beneath them and cause local pitting; the report recommends approved air venting devices. In dry and preaction systems, water left in low points after testing is the leading cause of leaks in galvanized pipe, and the report recommends nitrogen as the supervisory gas instead of air.
The report treats MIC as a contributing factor in most cases and stresses that all factors must be evaluated before blaming it. Chlorides, sulfates and low alkalinity also matter. So check the water source and fire tank, vent air on first fill, and slope dry systems so they drain completely.
Flushing and hydrostatic testing
NFPA 24 requires underground mains to be flushed at a flow high enough to carry out stones and debris before they are connected to the aboveground system, so debris does not reach pumps and sprinklers. The standard sets the flow by pipe size.
After installation, NFPA 13 (2025 edition) requires a hydrostatic test of new piping at the pressure and duration it specifies, with a higher test pressure where working pressure exceeds a set limit, and no pressure loss or visible leakage. Underground mains are tested to NFPA 24. Results go on the Contractor’s Material and Test Certificate.
Submittals and SASO / SABER requirements
A pipe and fittings submittal usually includes the datasheet for each product, proof of listing or approval for the model and size, mill test certificates for each batch showing ASTM grade and pressure test results, and the installation manual. For a step-by-step check of UL and FM certificates, see our UL, FM and LPCB verification guide.
On Saudi conformity, the SASO technical regulation for pipes used in water, electricity and gas networks explicitly excludes pipes and fittings used in firefighting systems. The technical regulation for fire control materials and equipment covers extinguishing equipment, fire pumps, extinguishing agents and their parts and accessories. Its annex customs list does not name pipes and refers to SABER as the updated list. So confirm each product’s status on SABER by its customs code with a conformity assessment body before import.
Common mistakes with fire protection piping and fittings
- Threading Schedule 10 pipe that is not listed for threading.
- Mixing a coupling from one manufacturer with a fitting or gasket from another, outside the listing.
- Running CPVC through a space hotter than its listing allows, or in contact with incompatible materials.
- Leaving cut-out discs inside the pipe after welded outlets, which later block sprinklers.
- Dry systems with no drainage slope, so water stays and pitting starts within a few years.
- Accepting a UL or FM logo in a catalogue without matching size and wall to the listing record.
KDI and Victaulic from AZEIDK
AZEIDK supplies KDI ERW steel pipe made in the Jebel Ali Free Zone: Schedule 10 to ASTM A795 and Schedule 40 to ASTM A53, black or hot-dip galvanized, up to 6 inches. UL listing and FM approval cover specific sizes for each schedule, so check the datasheet before approval. Our Victaulic article covers the sprinklers we supply from this brand, which is well known for grooved couplings and piping products. Our technical supply service includes full pipe documentation.
Frequently asked questions
Is Schedule 10 lower quality than Schedule 40?
Not necessarily. Both are acceptable when listed for the use and joined the right way. The differences are wall thickness, permitted joining methods and corrosion resistance ratio.
Is galvanized pipe always better?
No. Galvanizing helps in dry and preaction systems, but trapped water consumes the zinc and then the steel. Good drainage and nitrogen matter more than the finish alone.
Can CPVC be used in warehouses?
CPVC listings cover specific uses such as light hazard and wet residential systems, and normally not warehouse storage. Check the listing of the product itself.
Do fire pipes need a conformity certificate on SABER?
The water network pipe regulation excludes firefighting pipes, and the fire equipment regulation does not name pipes in its list. Confirm the product’s status by customs code on SABER before import.
When is the underground main flushed?
Before it is connected to the aboveground system, at the flow NFPA 24 sets. It is then hydrostatically tested, and both are recorded in the acceptance documents.
Conclusion
Good fire protection piping starts with matching material and wall thickness to the joining method. Then verify the listing of the whole assembly, not the pipe alone. Then get hanging, drainage and corrosion control right, and finish with documented flushing and testing. Checking this at submittal stage costs far less than a leak in a working warehouse.
Preparing the pipe and fittings BOQ for your project? Send us sizes, system type and joining methods, and we will propose suitable products with datasheets and the listing status of each size. Talk to the AZEIDK team
