Stainless and carbon steel flanges for US data center cooling
Weld neck, slip-on, blind and lap joint flanges to ASME B16.5 and B16.47 in ASTM A182 316L and 304L, A105 and A350 LF2, plus AWWA C207 and C228 for large water mains. Forged, machined and tested at our works in Gujarat, India, and shipped to US projects with a mill test report for every heat.
- ISO 9001:2015, TÜV NORD
- Mill test reports to EN 10204 3.1
- 100% PMI on stainless
- Pickled and passivated to ASTM A380 and A967
Where our flanges sit in a liquid-cooled data center
Supply, cooler water to the racksReturn, warmer water to the plant
- Heat rejectionCooling towers, dry coolers, condenser water pumpsA105, A350 LF2
AWWA C207, B16.5 Class 150
Flat face to cast iron pumps - Chiller plantChillers, primary and secondary pumps, headersA105, 304L, 316L
B16.5, B16.47, AWWA C207
Weld neck, slip-on, blind - Facility waterMains from the plant to the white space and CDUsA105 or 304L/316L
B16.5 Class 150, B16.47
4 to 48 in mains - Coolant distribution unitHeat exchanger between facility water and the IT coolant316L, 304L
B16.5 Class 150
Pickled and passivated - Technology coolingRow manifolds to racks and cold plates316L stainless
Class 150 WN, SO, lap joint
Clean, PMI checked
Flanges by material, standard and type
Every flange is supplied to your line list in ASME and ASTM designations, from small-bore vents and drains to large-diameter mains. Mixed orders of a few pieces per size are welcome, so one package can cover the plant, the CDU skids and the white space.
Stainless steel flanges
304L and 316L for CDUs, TCS loops and stainless mains. Pickled and passivated on request.
ASTM A182 F304L, F316L
Carbon steel flanges
A105 and A350 LF2 for chilled water, condenser water and facility water mains.
ASTM A105, A350 LF2, A516-70ASME B16.5
NPS 1/2 to 24, Class 150 and 300. The default for data center mechanical piping.
Class 150, RF, FFASME B16.47
Series A and B weld neck and blind flanges for headers above 24 inches.
Series A, Series BAWWA C207
Steel ring, hub and blind flanges for large chilled and condenser water mains.
Ring, hub and blind, flat faceAWWA C228
Stainless ring slip-on and blind flanges for large stainless water mains.
Ring slip-on and blind, flat faceWeld neck flanges
Butt welded with a smooth bore. First choice on TCS headers and equipment nozzles.
WN, RF, FFLap joint and stub ends
Only the 316L stub end is wetted; the loose flange rotates for easy alignment.
B16.9, MSS SP-43US data center markets we supply
Climate, water rules and logistics differ from Northern Virginia to Reno, and so does the flange schedule. Each market page covers all three.
- Northern Virginia4.5 GW of capacity, freezing winters and reclaimed water. Gateways: Norfolk or Baltimore.
- Dallas-Fort Worth1.4 GW of capacity, 100 °F summers and the 2021 freeze. Gateway: Port Houston.
- Phoenix1.1 GW of capacity, 111 days a year above 100 °F, little water. Gateway: Los Angeles and Long Beach.
- Chicago911 MW of capacity and -9 °F winter nights. Arrives by rail from either coast.
- AtlantaNearly 2.9 GW under construction, hot and humid. Gateway: Savannah.
- Silicon Valley509 MW of capacity, mild climate, liquid cooling refits. Gateway: Oakland.
- Columbus, Ohio114 data centers around Columbus and -22 °F record cold. Arrives by rail from the East Coast.
- Hillsboro, Oregon491 MW of capacity and almost none free. Mild, but 114 °F in 2021. Gateway: Seattle and Tacoma.
- New York and New Jersey190 MW of capacity in tall buildings and New Jersey campuses. Gateway: Port of NY and NJ.
- RenoHigh desert at 4,400 feet: dry air, cold nights. Gateway: Oakland, then I-80.
Stainless flanges that arrive ready for a clean loop
Cold plates on direct-to-chip servers have flow channels of about 100 microns, so the technology cooling loop has to start clean and stay clean. ASHRAE TC 9.9's May 2026 bulletin on coolant integrity warns that a single stainless component that is not passivated can put the whole loop at risk. Here is how our stainless flanges arrive.
- Pickled and passivated to ASTM A380 and A967 when you specify it, to remove free iron and restore the passive chromium oxide layer.
- 100% positive material identification on our Bruker PMI analyzer, recorded with the mill test report.
- Intergranular corrosion testing to ASTM A262 Practice E on request, at an accredited laboratory.
- Heat number stamped before machining, so every flange traces back to its melt.
Flanges for the technology cooling systemPickling and passivation explained
We forge, machine and test under one roof
Bar is cut, heated and forged on our 1.25-metric-ton hammer, heat treated, machined on CNC and conventional lathes, then tested in our own lab before it is marked and packed for export.
- Site area
- 45,000 sq ft
- CNC lathes
- 5
- Vertical machining centers
- 2
- Conventional lathes
- 10
- People
- 100+
How a US order works
- Send a line list or BOM. We quote every line as specified and flag anything we would supply differently.
- Inspect before it ships. Your inspector or agency is welcome at the works; EN 10204 3.2 certificates on request.
- Documents with every shipment: mill test reports, PMI records, packing list and commercial invoice, with the origin die stamped on the flanges.
- Your terms, your port: FOB India, CIF a US port or another Incoterm you name.
Flanges by cooling system
Each loop has its own fluid, pressure and cleanliness rules, so each has its own flange specification.
Chilled water systems
Plant rooms, headers and facility water mains. A105 and stainless, Class 150 and PN16.
CHW, FWS
Condenser water and cooling towers
Large, low pressure mains to towers and dry coolers. A105, LF2 and AWWA C207.
CW, heat rejectionCoolant distribution units
Stainless flanges and stub ends for CDU builders and skid fabricators.
CDU, FWS to TCSTechnology cooling system (TCS)
The clean secondary loop to the racks. 316L, pickled and passivated, crevice-free joints.
TCS, SFN, DLCEngineering guides for data center piping
Short, practical notes for engineers and buyers writing the piping spec.
- Direct-to-chip coolingCold plates, manifolds and CDUs, and which joints in a direct-to-chip system are flanged.
- FWS vs TCSThe two water loops of a liquid-cooled data center and what each means for materials and flanges.
- Pressure class selectionClass 150 or 300, PN16 or PN25: static head, pump head, surge and test pressure, with a worked example.
- ASME B31.9The building services piping code: scope, limits, testing and what it means for flanges.
- Pickling and passivationASTM A380 and A967 explained, and why the TCS loop needs treated stainless surfaces.
- AWWA vs ASME flangesSizes, classes, faces and drilling, and when each standard makes sense on large water mains.
Independently certified
Certificates for your vendor file, plus a sample mill test report.
ISO 9001:2015
TÜV NORD CERT GmbH
No. 44 100 20392915
Valid 31 Jul 2026 to 13 Jul 2029
PED 2014/68/EU
TÜV Rheinland Polska Sp. z o.o.
No. 01 2627 IN/M1-260026.00
Valid 11 May 2026 to 10 May 2029
NORSOK M-650
Gulf Lloyds Industrial Services (GLIS)
No. GLIS/RIC/2024/09/MMC-1414
Valid 14 Sep 2024 to 14 Sep 2027