65 mm (2½ inch) Pipe Weight per Meter

What 65 NB pipe weight means

65 NB is the 2½-inch row. The steel OD is 76.1 mm on Light, Medium and Heavy under IS 1239 Part 1. That OD is not the ASME 2½-inch OD.

Walls on this bore are Light 3.2 mm, Medium 3.6 mm, and Heavy 4.5 mm. Medium here shares the 3.6 mm wall with 50 NB Medium. Heavy shares the 4.5 mm wall with 50 NB Heavy. OD and kg/m still change.

The listed kg/m is plain-end theoretical mass for 65 NB. It is not a pressure stamp. A schedule number alone does not fix a pressure rating.

The site fire-system table lists 65 mm NB as the landing-valve takeoff and names IS 1239 Heavy class on that typical row. The approved fire-NOC drawing still selects the wall for each riser.

ASME B36.10M 2½ inch on the schedule chart uses 73.0 mm OD and a Sch 40 wall of 5.16 mm. Do not drop a 73.0 mm stick onto a 76.1 mm IS 1239 take-off.

Who should buy 65 NB in the Kanpur belt

Buy 65 NB when the approved landing-valve, intermediate water, or utility drawing names 65 mm NB. A Panki fire installer should quote the drawing line instead of stepping up from 50 NB by habit.

The site fire-system BOQ places 65 mm NB on landing-valve takeoffs. Clause 7.3 of CPWD Part V (2020) names mild-steel Heavy C-class IS 1239 through 150 mm for work inside that book.

Do not place 65 NB on a hydrant lateral by reading only the inch name. The same fire table puts hydrant laterals at 80 mm or 100 mm NB. Hydraulic design owns each fire-service size.

Do not treat 65 NB as IS 4270 casing or as boiler tube. IBR Form III-B covers tubes named on the boiler drawing. Form III-A covers steam pipes. Form III-C covers mountings and fittings.

A Prayagraj or Kanpur Dehat water bidder may take 65 NB only when the approved service schedule names it. JJM last-mile taps on this site sit at smaller bores.

65 NB weights beside dated Kanpur rates

Read kg/m from this 65 NB row and ₹/kg from the 24 May 2026 lists. GI sits above MS on every class.

Rounding down to stay below 1,000 kg gives 28 Light pieces, 25 Medium pieces, or 20 Heavy pieces. Twenty-five Medium sticks equal 25 × 38.6 = 965 kg.

RFQ line for 65 NB landing-valve tube

A 2½-inch line that only says fire pipe and Heavy still omits OD, because ASME 2½ inch and IS 1239 65 NB do not share a diameter. Lock each field.

• Size: 65 NB / 2½ inch, OD 76.1 mm. Reject 73.0 mm ASME stock against this line.
• Class: Light 3.2 mm, Medium 3.6 mm, or Heavy 4.5 mm. A landing-valve takeoff copies the approved fire drawing.
• Write IS 1239 Part 1 steel tube and carry any project grade text onto the PO.
• Surface: black, or IS 4736 zinc held at the 360 g/m² amended average.
• Trade length 6 m, or cut pieces when the riser drop cannot take a 6 m stick.
• Ends: screwed and socketed or plain end, matching the landing-valve joint detail.
• Quantity: lengths plus MT. Thirty-six Heavy sticks are 1.717 MT.
• MTC 3.1, heat, BIS licence. Name the TPI agency only when the fire NOC package lists one.
• Mark class and heat on the bundle tag. Add finish and length. Count sockets when T&C is ordered.
• Ex-warehouse Kanpur, GST 18% extra, Panki or Prayagraj PIN if delivered.

Worked 65 NB Heavy lot of 36 lengths

For a worked Panki landing-valve take-off, suppose the approved riser schedule lists 36 lengths of 65 NB Heavy GI. The black Heavy stick is 47.7 kg, so thirty-six sticks are 36 × 47.7 = 1,717.2 kg, or 1.717 MT black.

Apply the 3-6% zinc note: 1,717.2 × 1.03 = 1,768.72 kg to 1,717.2 × 1.06 = 1,820.23 kg coated. If a separate Medium packing group holds 22 lengths, its theoretical black mass is 22 × 38.6 = 849.2 kg.

Floor(1000 ÷ 47.7) gives 20 Heavy sticks below one theoretical tonne, at 954 kg. Twenty-five Medium sticks sit at 965 kg. Keep those two class groups on separate packing-list lines.

Black Heavy at ₹56-64 per kg (24 May 2026) values 1,717.2 kg at 1,717.2 × 56 = ₹96,163 to 1,717.2 × 64 = ₹1,09,901. Medium black at ₹53-59 on the 849.2 kg group is 849.2 × 53 = ₹45,008 to 849.2 × 59 = ₹50,103.

GI Heavy on that 36-length takeoff at ₹70-78 per kg on the coated band is 1,768.72 × 70 = ₹1,23,810 to 1,820.23 × 78 = ₹1,41,978 before GST. Put the landing-valve class on the RFQ with the drawing attached.

Budget GST 18% extra on that steel value. Freight to a Prayagraj PIN sits outside the dated ₹/kg band. The Prayagraj city page places that drop on the NH-19 corridor from this yard.

Failure modes on 2½-inch class pipe

A specification mismatch happens when a 2½-inch Sch 40 seamless length is issued against an IS 1239 Heavy PO. Gauge OD first: 73.0 mm versus 76.1 mm. Then gauge wall: 5.16 mm versus 4.5 mm.

Light 65 NB and Light 80 NB both use a 3.2 mm wall. Weigh the stick: 34.5 kg versus 40.6 kg. A 3-inch crate does not close a 65 NB landing-valve line.

A Medium stick can vary from 34.74 kg after the 10% deduction to 42.46 kg after the 10% addition. The Light theoretical stick is 34.5 kg, which falls just below that Medium band. Isolate it and read the class mark.

Forklift contact on a threaded landing-valve end can crush the first thread. Fit protectors before a Panki or Lucknow run.

If a theoretical challan for the 36-length example shows 1.390 MT, recheck its class. Medium 65 NB is 38.6 kg per stick, while this Heavy example totals 1.717 MT.

Standards that sit behind 65 NB mass

Clause 9.1(b) of IS 1239 Part 1:2004 is the mass clause used on the 34.74-42.46 kg Medium band. Welded Medium and Heavy wall under Clause 9.1(a) may run + not limited and −10%.

From a 4.5 mm Heavy wall the −10% floor is 4.05 mm. A 3.6 mm Medium reading is below that Heavy floor and should put the length on hold even when OD matches.

A 1.717 MT landing-valve lot is below the 10-tonne weighment floor, so single-tube ±10% remains the mass rule. The product manual still accepts each tube by a 5 MPa hydrostatic test or the eddy-current alternative.

IS 3589 starts at 168.3 mm OD. Do not stretch this 76.1 mm row into a trunk-main standard. Part 2 fittings for 2½ inch are a different PO line.

The DPIIT IBR forms index gives III-A to steam pipes, III-B to boiler tubes, and III-C to mountings and fittings. Those labels do not make a 65 NB landing-valve tube an IBR item.

Buying 65 NB pipe in Kanpur

Panki is about 12 km from Bartan Bazar. A factory fire-system buyer there should send the 65 NB landing-valve drawing and class with the enquiry. State finish and the site’s unloading limit on the same note.

Yard-stock IS 1239 follows the glossary lead-time window of 3-7 days. Standard mill-direct grades sit at 14-21 days. Name the need-by date on the RFQ.

Landing-valve crews should open fire hydrant pipe and fire-system pipe before they pick the metal. Zinc 65 NB belongs on GI pipes in Kanpur.

A Prayagraj drop runs down the NH-19 corridor described on the Prayagraj steel pipes page. Give the vehicle planner the 1.717 MT theoretical black mass from this example, the finish, and the exact PIN.

Neighbour rows live on 50 NB pipe weight and 80 NB pipe weight. Keep 76.1 mm written beside 2½ inch on every 65 NB line.

Key points

• The 65 NB Medium line is 76.1 mm OD with a 3.6 mm wall and 38.6 kg per 6 m.
• Thirty-six Heavy lengths start at 1,717.2 kg black before the 3-6% GI allowance.
• The 24 May 2026 MS Heavy planning band is ₹56-64 per kg ex-warehouse Kanpur.
• ASME 2½ inch uses 73.0 mm OD; IS 1239 65 NB uses 76.1 mm OD.
• The site fire-system table lists 65 mm NB as a typical landing-valve takeoff; class still follows the approved drawing.

Sources

• IS 1239 (Part 1):2004 Clause 9.1. Mass and thickness tolerances applied to the 38.6 kg Medium and 47.7 kg Heavy 65 NB sticks (Bureau of Indian Standards)
• IS 1239 : Part 1 : 2004 (reaffirmed 2019). Part 1 class tables that fix 65 NB at 76.1 mm OD, not at the ASME 73.0 mm OD (Bureau of Indian Standards e-sale (BSB Edge))
• PM/1239 (Part 1)/4 Feb 2022. 5 MPa hydrostatic test, or eddy-current alternative, recorded for licensed 65 NB tubes (Bureau of Indian Standards)
• CPWD General Specifications for Electrical Works, Part V, 2020, Clause 7.3. Heavy C-class IS 1239 through 150 mm inside the CPWD electrical-works fire-pipe scope (Central Public Works Department, Government of India)
• NBC 2016, Part 4. Fire and Life Safety provisions that sit with the approved landing-valve drawing (Bureau of Indian Standards)
• IS 4736 amended zinc-mass requirement. 360 g/m² amended zinc-mass floor on 3.2-4.5 mm 65 NB walls (Bureau of Indian Standards)
• ASME B36.10M schedule table on this site. 2-1/2 inch NPS: OD 73.0 mm, Sch 40 wall 5.16 mm, not interchangeable with IS 1239 65 NB (RP Sales pipe schedule chart)
• Indian Boiler Regulations, 1950. Forms index: III-A steam pipes, III-B tubes, III-C boiler mountings and fittings (Central Boilers Board, Government of India)

Related resources

• Full pipe weight chart
• 50 NB pipe weight
• 80 NB pipe weight
• Fire hydrant pipe guide
• Steel pipes in Prayagraj