Leading Manufacturer & Exporter of
ANSI B16.5 Flanges to Indonesia
Werner Flanges is a certified manufacturer and exporter of ANSI B16.5 flanges to Indonesia, supplying some of the country's most demanding industrial projects across the oil and gas, petrochemical, power generation, and manufacturing sectors. With over two decades of manufacturing expertise and a dedicated export division, we deliver precision-engineered, fully certified flanges to every major industrial centre in Indonesia — from Jakarta and Surabaya to Cilegon, Balikpapan, Medan, and Batam.
Our ANSI B16.5 flanges conform to all major international standards — ASME B16.5, ASTM A105, A182, A350 — and are manufactured in carbon steel, stainless steel, alloy steel, duplex, and super duplex grades. Available in all seven flange types, pressure classes from 150# through 2500#, and sizes from ½” to 24″ (with extended sizes to 60″ on request), we provide a complete solution for Indonesian procurement teams.
Indonesia’s rapidly expanding energy sector — led by PT Pertamina and supported by operators such as Chevron Pacific Indonesia, ExxonMobil, and CNOOC — demands flanges that meet international quality benchmarks without supply-chain delays. Werner Flanges maintains ready stock on the most common grades and configurations, enabling sea freight delivery to Tanjung Priok (Jakarta) or Tanjung Perak (Surabaya) within 18–25 days, with expedited air freight available when project timelines require it.
ANSI B16.5 is the American National Standards Institute / American Society of Mechanical Engineers standard that governs the dimensions, pressure-temperature ratings, materials, tolerances, marking, and testing of pipe flanges and flanged fittings in the size range ½" through 24" NPS (Nominal Pipe Size). It is the most widely adopted flange standard globally, and it is the default specification for procurement across Indonesia's oil, gas, chemical, and power industries.
ANSI B16.5 Flanges Standard | ½"–24" NPS | Oil & Gas, Chemical, and Power Industry Compliance
Specifications
| Specification | Details |
|---|---|
| Pressure Rating | Class 150 to Class 2500 |
| Flange Type | Plate Flange |
| Facing Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Size Range | ½” to 24” (DN 15 to DN 600) |
| Temperature Range | -29°C to +593°C (Depending on Material & Pressure Class) |
| Applications | Oil & Gas, Petrochemical, Power Generation, Water Treatment, Marine & Industrial Sectors |
| Manufacturing Process | Forged / Machined |
| Certification | EN 10204 3.1 / 3.2, IBR, NACE MR0175 / ISO 15156 (as applicable) |
Matel and Grade
| Type of Materials | Common Specifications / Customization Available on Request |
|---|---|
| Duplex Steel | ASTM/ASME A182 F51, F60, F61, UNS S31803, UNS S32205 |
| Super Duplex Steel | ASTM/ASME A182 F53, F55, UNS S32750, UNS S32760, F44 (6Mo) |
| Stainless Steel | ASTM/ASME A182 F304, F304L, F316, F316L, F310, F317L, F321, F347 |
| Carbon Steel | ASTM A105, A350 LF1, LF2, LF3, A266 Class 1/2, A694 F42 to F70, A765 Gr. II |
| Alloy Steel | ASTM/ASME A182 F1, F5, F9, F11, F12, F22 |
| Non-Ferrous Alloys | Titanium, Brass, Admiralty Brass, Copper Nickel, Nickel Alloys, Hastelloy |
| Titanium | ASTM/ASME B381 Gr.1, Gr.2, Gr.5, Gr.7, Gr.12, Gr.16 |
| Copper Nickel | ASTM B151 UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30) |
| Brass, Al-Brass | ASTM B152 UNS C26000, C27200, C28000; ASTM B111 for Al-Brass |
| Nickel Alloys | ASTM B160, B161, B564 – UNS N02200, N02201, N04400, N08800, N08825, N06600, N06601, N06625, Monel K500 |
| Alloy 20 | ASTM B462 UNS N08020 |
| Hastelloy | ASTM B564 UNS N10276 (Hastelloy C276), N06022 (Hastelloy C22) |
| Cladded Materials | ASTM B898, B265, B424 or custom explosion/clad bonding using dissimilar metals |
| Titanium-Steel, Nickel-Steel, Titanium-Copper, Stainless Steel-Carbon Steel, Bimetallic/Trimetallic Combinations |
Types of Flanges
| Slip On Flanges | Weld Neck Flanges | Blind Flanges | Socket Weld Flanges | Threaded Flanges |
| Lap Joint Flanges | Reducing Flanges | Orifice Flanges | Long Weld Neck Flanges | Spectacle Blind Flanges |
Industries and Applications We Supply
| Industry | Applications |
|---|---|
Oil & Gas Industry |
Indonesia’s hydrocarbon sector, dominated by PT Pertamina and international operators including Chevron Pacific Indonesia, ExxonMobil Cepu, CNOOC, and INPEX, represents the single largest demand driver for ANSI B16.5 flanges.
Upstream: Wellhead Christmas trees, choke manifolds, and flowline connections at onshore fields in Rokan Block (Riau), Mahakam Delta (East Kalimantan), and the Natuna offshore production platforms. Midstream: Crude oil trunk lines, gas gathering networks, metering skids, and pig launcher/receiver assemblies connecting fields to refineries. The Trans-Java gas pipeline and the Sumatran gas grid rely heavily on API and ANSI B16.5 rated flanges. Downstream: Pertamina operates six refineries — Balongan (West Java), Balikpapan (East Kalimantan), Dumai (Riau), Cilacap (Central Java), Kasim (West Papua), and Plaju (South Sumatra) — all requiring carbon steel and alloy steel flanges for process piping, heat exchangers, and reactor connections. LNG: The Tangguh LNG plant in Papua (BP), one of the world’s largest LNG export facilities, and the planned Masela Abadi LNG project (INPEX, Pertamina) both require large quantities of low-temperature ASTM A350 LF2 and stainless F316L flanges for cryogenic service. |
Power Generation
|
|
Chemical & Petrochemical Processing |
Cilegon in Banten Province — nicknamed Indonesia’s ‘Steel City’ — is also home to the country’s densest concentration of petrochemical and chemical plants, including Chandra Asri Petrochemical (CAP), Asahimas Chemical, Polypropylene Indonesia, and PT Trans Pacific Petrochemical Indotama (TPPI) in East Java.
These facilities require flanges in stainless steel, alloy steel, and duplex grades for corrosive chemical handling, reactor vessel nozzles, distillation column connections, and storage tank manifolds. High-purity applications in pharmaceutical intermediates and specialty chemicals demand flanges with certified surface finishes and documentation. . |
|
With a population exceeding 275 million spread across 17,000 islands, Indonesia’s water infrastructure investment is significant. Municipal water treatment plants, industrial effluent treatment systems, and pumping stations across Java, Sumatra, and Kalimantan all require carbon steel and stainless steel flanges rated to 150# and 300# for pipelines, filter housings, and pump connections. |
Frequently Asked Questions (FAQs)
-
q1: are werner flanges compliant with indonesian sni standards for pipe flanges?
- indonesian national standard sni 07-0040-1987 covers steel pipe flanges and is largely harmonised with ansi/asme b16.5 dimensional requirements. our ansi b16.5 flanges are dimensionally compatible with sni requirements. for projects formally requiring sni certification, we can provide the relevant technical documentation and arrange third-party verification.
-
q2: what is the typical delivery time to jakarta from india?
- standard sea freight from our factory to tanjung priok, jakarta takes 18–22 days (transit only; add 3–5 days for customs clearance). for urgent project requirements, air freight to soekarno-hatta international airport takes 3–5 days from dispatch.
-
q3: can you supply flanges certified for nace / sour gas service for pertamina projects?
- yes. we supply nace mr0175 / iso 15156 compliant flanges with hardness-controlled carbon steel (≤200 hbw) and alloy steel grades. hic (hydrogen induced cracking) and sscc (sulphide stress corrosion cracking) test reports are available from accredited laboratories. these are commonly required for pertamina upstream procurement.
-
q4: do you support third-party inspection (tpi) by dnv, bv, or sgs in indonesia?
- yes. our facility is approved for inspection by all major tpi agencies. we coordinate directly with your nominated inspector to schedule inspection visits and ensure all test reports and documentation are available in advance. tpi is included in our project management workflow at no surcharge.
-
q5: what payment terms are available for indonesian buyers?
- standard payment terms are 30–50% advance with the balance against copy documents / before shipment. for established customers with a trading history, we offer open terms or letter of credit (lc at sight) as alternatives. all major currencies accepted — usd, eur, and inr.
-
q6: can you manufacture non-standard sizes or custom bore dimensions?
- yes. non-standard bore dimensions, extra-long hubs, special facings, and non-standard sizes outside asme b16.5 (up to 60″ nps per asme b16.47) are available with lead times of 4–8 weeks depending on complexity and material availability. please supply your drawing or dimensional specification.
-
q7: what incoterms do you typically quote for indonesia shipments?
- we most commonly quote fob (free on board, indian port of loading), cfr (cost and freight to destination port), or cif (cost, insurance, and freight). ddp (delivered duty paid) to indonesian destinations is available for select logistics partners. we recommend agreeing incoterms upfront to clarify responsibility for customs, duties, and last-mile delivery.
-
q8: are you able to supply flanges for the tangguh lng upstream compression (ucc) project?
- yes. we have supplied to lng and deep-water gas projects with equivalent specifications. we can provide a350 lf2 carbon steel and a182 f316l stainless steel flanges conforming to bp global standards, shell deps, and applicable asme b16.5 classes, accompanied by the full documentation package required for major project procurement.
