MS Pipe Fittings Weight Chart — Elbows, Tees, and Flanges
Pipe fitting weights vary significantly by their Schedule (wall thickness). This chart covers standard Schedule 40 (STD) Mild Steel butt-weld fittings and ANSI B16.5 Class 150 flanges.
- A 4" (100 NB) Schedule 40 90-degree elbow weighs approximately 3.50 kg
- Schedule 80 (Extra Heavy) fittings weigh significantly more and must be calculated separately
- Flange weights include the mass of the entire solid steel ring
In industrial piping, you aren't just calculating the weight of straight pipe runs. In India, MS pipe fittings for general engineering use are manufactured to IS 1239 (Part 2):1992 (Mild Steel Tubes, Tubulars and Other Wrought Steel Fittings), which specifies dimensional and mass requirements for standard fittings up to 150 NB. A complex pipe spool contains dozens of butt-weld fittings—elbows to navigate corners, tees to split flow, reducers to change diameter, and heavy slip-on flanges for bolting. Knowing the exact MS pipe fittings weight allows piping contractors to accurately estimate shipping loads and safely plan crane rigging operations.
MS Pipe Fittings Weight Chart — Schedule 40 (Standard Wall)
Below is the reference mass table for the most common seamless Mild Steel (MS) butt-weld fittings and standard slip-on flanges used in typical industrial fluid transfer systems.
| Nominal Bore (NB) | 90° Elbow (kg) | Equal Tee (kg) | Concentric Reducer* (kg) | Slip-On Flange (kg) |
|---|---|---|---|---|
| 25 NB (1") | 0.17 | 0.31 | 0.15 | 0.70 |
| 50 NB (2") | 0.65 | 0.95 | 0.42 | 1.90 |
| 80 NB (3") | 1.85 | 2.50 | 1.10 | 3.50 |
| 100 NB (4") | 3.50 | 4.50 | 1.80 | 5.20 |
| 150 NB (6") | 10.30 | 13.60 | 4.50 | 8.50 |
| 200 NB (8") | 21.00 | 25.50 | 8.60 | 12.80 |
Note: All weights are approximate for Schedule 40 (Standard Wall) butt-weld fittings. Flange weights are based on ANSI B16.5 Class 150 specifications. *Reducer weights represent the average for common single-step diameter reductions.
Worked Example: Calculating Spool Shipping Weight
An industrial piping contractor in Gujarat is fabricating a cooling water spool piece. The spool assembly consists of:
- 6 metres of straight 100 NB (4") Schedule 40 pipe.
- Two 90° Elbows (100 NB).
- Two Slip-On Flanges (100 NB).
To plan for truck transport, the engineer must calculate the total dead load.
Straight Pipe: Referring to the pipe weight chart, 100 NB SCH 40 pipe weighs 16.07 kg/m. (6m × 16.07 = 96.42 kg)
Elbows: From the fitting chart above, a 4" elbow weighs 3.50 kg. (2 × 3.50 = 7.00 kg)
Flanges: A 4" slip-on flange weighs 5.20 kg. (2 × 5.20 = 10.40 kg)
Total Spool Weight: 96.42 + 7.00 + 10.40 = 113.82 kg.
By accounting for the fittings (which add nearly 15% to the total mass), the contractor ensures the truck load limits and crane capacities are never exceeded during erection.
Frequently Asked Questions
How to calculate MS elbow weight?
The theoretical weight of an MS elbow depends heavily on its manufacturing method (seamless vs welded), its radius (Short Radius vs Long Radius), and its Schedule (wall thickness). For example, a 4" Long Radius Schedule 40 elbow weighs roughly 3.5 kg. Engineers rely on standardized manufacturer charts rather than manual formulas due to the complex geometry of the bend.
What is the weight of a 4 inch MS flange?
A standard 4 inch (100 NB) Mild Steel Slip-On Flange built to ANSI B16.5 Class 150 specifications weighs approximately 5.20 kg. If the pressure rating increases to Class 300 or Class 600, the flange becomes significantly thicker and heavier.
MS pipe fitting ka weight kaise nikale?
MS pipe fitting ka weight nikalne ke liye fitting ka Nominal Bore (jaise 2 inch, 4 inch) aur uska Schedule (jaise SCH 40 ya SCH 80) pata hona chahiye. Har fitting ki shape alag hoti hai, isliye isko formula se nikalne ke bajaye, standard ANSI/ASME ya IS weight charts ka upyog kiya jata hai, jaise upar table mein diya gaya hai.
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