Looking for GI pipe specifications in Qatar or the UAE for your industrial project? This guide covers all standard galvanized iron pipe sizes, dimensions, and weight per meter, explains the difference between Schedule 40 and Schedule 80, and helps you choose the right size, schedule, and supplier for your specific application.
As an established GI pipe supplier and installation contractor operating in both Qatar (Doha, Ras Laffan, Mesaieed) and UAE (Dubai DIP, Abu Dhabi, Sharjah), we stock all standard sizes and can deliver to your site within 24-48 hours.
GI pipe sizes for industrial use in Qatar and UAE range from ½" to 6" nominal bore, available in Schedule 40 (standard) and Schedule 80 (heavy). As of Q1 2026, indicative prices in Doha are: ½" Sch 40 ≈ QAR 8–12/m, 1" ≈ QAR 15–22/m, 2" ≈ QAR 38–55/m, 4" ≈ QAR 90–130/m. Prices vary with zinc coating quality, brand and order volume. Aamtron Group supplies from stock in Doha and Dubai with same-week delivery.
GI Pipe Size Chart — Schedule 40 (Class B)
Standard dimensions for Class B/Schedule 40 hot-dipped galvanized pipe conforming to ASTM A53 / BS 1387:
| Nominal Size | OD (mm) | Wall (mm) | Weight (kg/m) | Weight/6m (kg) |
|---|---|---|---|---|
| ½" | 21.3 | 2.65 | 1.22 | 7.3 |
| ¾" | 26.7 | 2.65 | 1.58 | 9.5 |
| 1" | 33.4 | 3.25 | 2.41 | 14.5 |
| 1¼" | 42.2 | 3.25 | 3.14 | 18.8 |
| 1½" | 48.3 | 3.25 | 3.61 | 21.7 |
| 2" | 60.3 | 3.65 | 5.10 | 30.6 |
| 2½" | 73.0 | 3.65 | 6.25 | 37.5 |
| 3" | 88.9 | 4.05 | 8.47 | 50.8 |
| 4" | 114.3 | 4.50 | 12.20 | 73.2 |
| 5" | 141.3 | 4.85 | 16.30 | 97.8 |
| 6" | 168.3 | 4.85 | 19.50 | 117.0 |
Note: All dimensions conform to ASTM A53 / BS 1387 standards. Weights are approximate for hot-dipped galvanized pipe. Contact us for current availability and quotations.
Schedule 40 vs Schedule 80 — When to Use Which
The "Schedule" number refers to the wall thickness of the pipe. Higher schedule = thicker wall = higher pressure rating.
Pressure Rating: Up to 150 PSI (10 Bar) for most sizes
Best For: General compressed air (7-10 Bar), water supply, drainage, general
industrial use
Standard: Most commonly used for general applications
Availability: Most commonly stocked — available immediately from most Qatar
suppliers
Pressure Rating: Up to 300 PSI (20+ Bar) for most sizes
Best For: High-pressure compressed air (20-40 Bar), steam lines, hydraulic
piping, PET blowing
Wall Thickness: Approximately 30-40% thicker than Schedule 40
Availability: Less commonly stocked — may require 1-2 week lead time for large
sizes in Qatar
GI Pipe Fittings — Common Types
Every GI piping installation requires matching fittings. Here are the common types used in industrial piping systems:
| Fitting Type | Function | Available Sizes | Material |
|---|---|---|---|
| 90° Elbow | Changes pipe direction by 90° | ½" — 6" | Malleable Iron / GI |
| Tee | Creates branch connection | ½" — 6" | Malleable Iron / GI |
| Union | Connects pipes for easy disassembly | ½" — 4" | Malleable Iron / GI |
| Nipple | Short connector between fittings | ½" — 4" | GI threaded |
| Reducer | Connects different pipe sizes | ¾"×½" — 6"×4" | Malleable Iron / GI |
| Socket | Joins two pipes inline | ½" — 6" | Malleable Iron / GI |
| Cap | Seals pipe end | ½" — 6" | Malleable Iron / GI |
| Gate Valve | Full-bore isolation valve | ½" — 6" | Brass / Cast Iron |
| Ball Valve | Quarter-turn shut-off valve | ½" — 4" | Brass / Stainless Steel |
All fittings available in galvanized finish. Contact us for complete supply packages including pipes, fittings, and valves.
How to Choose the Right GI Pipe Size
- Compressed Air (Main Header): 2" to 4" depending on compressor capacity and number of drops
- Compressed Air (Drop Lines): ½" to ¾" for individual machine connections
- Water Supply: ½" to 2" depending on building size and flow requirements
- Fire Fighting: 2" to 6" depending on system design and NFPA requirements
- HVAC Condensate: ¾" to 1½"
For compressed air applications, always size based on air flow rate (CFM) and acceptable pressure drop — not just pipe diameter. Our engineers perform free sizing calculations for all projects.
Tips for Buying GI Pipes in Qatar & UAE
- Always verify the galvanizing quality. Hot-dipped galvanized (HDG) is superior to electro-galvanized. Check for uniform zinc coating — minimum 610 g/m² for Class B.
- Buy pipes and fittings from the same supplier. Thread compatibility issues arise when mixing brands. This is especially critical in Qatar where multiple origins (India, China, Turkey) are common.
- Check for mill certificates. Every batch should come with a mill test certificate (MTC) confirming chemical composition and mechanical properties.
- Consider supply + installation. Contractors like Aamtron Group who both supply and install offer significant savings vs buying separately because we buy in bulk directly from manufacturers.
- Plan for 10% wastage. Threading and cutting always produces waste. Order 10% more than your calculated requirement.
We Supply & Install — Request a Quote
Aamtron Group maintains permanent GI pipe stock in both Doha and Dubai. We supply all sizes (½" to 6"), both Schedule 40 and Schedule 80, with matching fittings and valves. Contact us for a complete supply + installation quotation tailored to your project.
Frequently Asked Questions
What sizes of GI pipe are available in Qatar?
GI pipes in Qatar are available from ½" (21.3mm OD) up to 6" (168.3mm OD) in both Schedule 40 and Schedule 80. All sizes conform to ASTM A53 / BS 1387 standards and are stocked by major suppliers in Doha's New Industrial Area.
What is the difference between Schedule 40 and Schedule 80 GI pipe?
Schedule 80 has a thicker wall than Schedule 40, making it stronger and rated for higher pressures (20+ Bar vs 10-15 Bar). Schedule 40 is standard for most compressed air applications. Schedule 80 is required for high-pressure systems like PET blowing machines.
Where can I buy GI pipes in Doha, Qatar?
GI pipes are available from industrial supply stores in Doha's New Industrial Area, Salwa Road, and Street 44. Aamtron Group supplies and installs all sizes from our Doha warehouse — contact us for availability and quotation.
Which GI pipe brand is best in Qatar?
Top brands available in Qatar include APL Apollo, Tata Steel, Jindal, MSL, and Tata Structura. All are ASTM A53 / BS 1387 compliant. We recommend APL Apollo or Tata for heavy industrial applications and provide mill test certificates with every order.