Samvay Fluid Tekniks Inc forges and machines instrumentation fittings in Ahmedabad, India, and ships them to contractors and EPC teams working across Oman. This page is about what those projects actually specify — not a catalogue of everything we make, but the grades, sizes and paperwork that Omani plants ask for.
Three things drive the specification here more than anywhere else we export: hydrogen sulphide in the produced fluids, chloride-laden air along the coast, and a temperature swing between a Duqm night and a Nizwa afternoon that no gasket enjoys. Get those three right and a tube fitting lasts the life of the loop. Get them wrong and you are back on site with a wrench.
Why Omani projects specify differently
Sour service tube fittings in Oman are the first thing most enquiries ask about, and it is a fair question. A large share of the country’s production carries H2S, and once it does, the material choice stops being a preference and becomes a code requirement. Sulphide stress cracking does not announce itself: a fitting holds pressure for months and then fails at the ferrule seat.
The second question is the air. Sohar, Duqm, Sur and Salalah sit on the water, and salt-bearing humidity attacks 316 externally even when the process inside is benign. Pitting starts under the nut, where nobody inspects. Plants a few hundred kilometres inland have the opposite problem — dry heat, sand and a wide daily cycle that works the joint loose over time.
The third is schedule. Refinery and LNG work in Oman runs to fixed shutdown windows. A fitting that arrives without the right certificate is not late paperwork, it is a loop that cannot be signed off.
Materials that hold up in Omani duty
For clean instrument air, utility water and general hook-up work, 316L tube fittings in Oman remain the sensible default, and we stock them in the common imperial and metric sizes.
Where H2S is present, the specification moves to materials qualified to ISO 15156. We supply NACE MR0175 tube fittings Oman projects specify in 316L, to the hardness limits the standard sets, and in duplex grades where strength matters as much as cracking resistance.
For coastal plants and seawater-adjacent service, duplex tube fittings for Oman in UNS S31803 and S32205, and super duplex in S32750, give the chloride pitting resistance that 316 cannot. The cost difference is real, but so is the difference in how long the joint survives outdoors near the Gulf of Oman.
For the hottest and most aggressive loops — sour gas dehydration, amine service, high-chloride injection — nickel alloy tube fittings Oman sites need in Monel, Inconel, Hastelloy and titanium are available. These are made to order rather than stocked, and lead time depends on bar availability.
Everything is machined from forged bar to ASTM A182 or ASTM A276 depending on the grade, not from castings.
Sizes, ends and what fits your existing tubing
We supply double ferrule tube fittings in Oman from 3 mm to 50 mm outside diameter, and the imperial equivalents from 1/8 inch to 2 inch. Omani sites run both systems, often in the same plant — older process units in imperial, newer packaged skids in metric — so tell us the tubing OD and wall thickness you actually have, not the nominal line size.
The twin-ferrule design is what makes the joint work: the front ferrule seals against the fitting body while the back ferrule grips the tube and takes the vibration. That matters on compressor skids and near reciprocating pumps, where a single-ferrule joint slowly walks itself loose.
End connections cover NPT, BSP parallel and taper, ISO 6149 metric, and SAE straight thread. If the instrument came with a metric port and the tubing run is imperial, say so on the enquiry and we will supply the adapter rather than leaving it to site.
Compression tube fittings for hook-up and impulse lines
Most of what leaves our floor for Oman goes into instrument hook-up: impulse lines to transmitters, gauge lines, close-coupled manifolds, air supply to positioners. Compression tube fittings Oman projects use are rarely exotic — the volume is in 6 mm, 12 mm, 1/4 inch and 1/2 inch — but they are the joints that get disturbed most often during commissioning and maintenance.
Remakeability therefore matters more than the datasheet suggests. A properly pulled-up twin-ferrule joint can be broken and remade several times without losing its seal, provided the ferrules are not mixed between manufacturers. We supply complete fittings rather than loose ferrules for exactly that reason.
Instrumentation Tube Fittings Specifications, Standards, Sizes & Grades
| Types | Tube to Female, Instrument Pipe Fittings, Tube to Union, Accessories, Tube to Male |
|---|---|
| Equivalent To | DK-LOK, PARKER, SWAGELOK, HOKE |
| Standard | ASME SA-479, Type 304-SS, BS 970 304S11, DIN 4401, ASTM A276 Type 304 |
| Sizes | 1/8’’ to 2’’ and 3mm to 50mm |
| Ends | Threaded, Welding, JIC |
| Pressure Rating | 1000 Psi, 3000 Psi, 6000 Psi, 10000 Psi |
| Threads | NPT , BSPT, BSPP |
| Specification | Items Made from Hex – ASTM A276; Items made from Round Bar- ASTM A182 |
| HS CODE | 73072900 |
Chemical Composition
| Grade | Ti | C | Fe | H | N | O | Al | V |
| Titanium Gr.5 | 90 min | – | 0.25 max | – | – | 0.2 max | 6 min | 4 min |
Mechanical Properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Titanium Gr.5 | 4.43 g/cm3 | 1632 °C (2970 °F) | Psi – 138000 , MPa – 950 | Psi – 128000 , MPa – 880 | 14 % |
Supply into Oman: ports, documents and lead time
Shipments clear through Sohar, Salalah or Muscat depending on the site, and the destination usually decides the routing more than the price does. Material for Duqm often moves through Duqm port directly; tube fittings for Sohar refinery and the surrounding industrial area clear locally.
Every consignment ships with EN 10204 3.1 mill test certificates traceable to the heat number, material test reports, and a certificate of origin. For sour service orders we include the hardness results the NACE specification requires. If your client’s ITP asks for third-party inspection, tell us before production rather than after — witnessing a heat that has already shipped is not possible.
As a tube fittings stockist in Oman market terms, we hold 316L and duplex in common sizes for quick despatch; nickel alloys and non-standard ends are made to order.
Sectors we supply in Oman
Upstream oil and gas, where sour wells drive the material choice. Refining and petrochemicals at Sohar and Duqm. LNG at Sur. Desalination and power along the coast, where chloride resistance decides the grade. Mining and minerals inland around Sohar’s smelter belt.
Instrumentation fittings for Duqm projects in particular tend to arrive with tighter documentation requirements than older sites, because much of the build there is recent and the ITPs were written to current standards.
What to send with your enquiry
A line list or a tag list is ideal. Failing that, four things get you a firm quotation the same week: tube OD and wall thickness, the process fluid and whether H2S is present, design pressure and temperature, and the end connection on the instrument.
If the enquiry is a replacement for fittings already installed, send a photograph of the existing joint and the marking on the nut. Mixing ferrule designs between makes is the single most common cause of a leak that appears three months after commissioning.
Frequently asked questions
Do you supply fittings qualified for sour service in Oman?
Yes. We supply 316L and duplex grades produced to the hardness limits ISO 15156 sets for sulphide stress cracking resistance, and shipped with the hardness test results included in the documentation package. Confirm the H2S partial pressure in your enquiry so the grade is selected against your actual service conditions rather than a general assumption.
Which grade should I use for a coastal plant at Sohar or Duqm?
For outdoor installations near the coast, duplex grades such as UNS S32205 are usually the right balance of cost and chloride pitting resistance, with super duplex S32750 where the exposure is severe or the process is also aggressive. Plain 316L is adequate indoors or in conditioned enclosures, but it pits externally under the nut in salt-bearing air.
Can you match metric fittings to imperial tubing?
Yes, and it is a common request on Omani sites where older imperial process units sit alongside newer metric skids. Send the measured tube outside diameter and wall thickness together with the instrument port thread, and we supply the correct fitting or adapter rather than leaving the mismatch to be solved during commissioning.
What documentation ships with an order?
Every consignment includes EN 10204 3.1 mill test certificates traceable to the heat number, material test reports and a certificate of origin. Sour service orders also carry the hardness results the standard requires. Third-party inspection can be arranged, but it must be agreed before production starts.
Client Projects For Instrumentation Tube Fittings
| Product supplied | Cities & States |
| Instrumentation Tube Fittings Supplier To Oil & Gas Industry | Muscat |
| All types of Instrumentation Tube Fittings Supplier | Salalah |
| Duplex Tube Fittings | Nizwa |
| Nickel Alloy Tube Fittings | Sohar |