Special Offers for Hard-to-Find Materials & Custom Sizes
DLSS supports urgent, non-standard, and corrosion-resistant piping projects with special materials, custom sizes, and flexible inspection requirements.
When Standard Sizes Are Not Enough
Many heat exchanger, shipbuilding, petrochemical, and maintenance projects require materials or sizes that are not easy to find from standard stock. DLSS helps customers handle special material grades, non-standard dimensions, urgent replacement orders, and project inspection requirements.
Urgent replacement and fast sourcing support
Nickel alloy, duplex, titanium, copper nickel available
Custom OD, WT, length, radius, and machining
TPI, PMI, UT, ET, HT, MTC 3.1/3.2 support
Special Materials We Support
Not sure which material is suitable? Send us your working temperature, medium, pressure, and drawing. Our team can help check the possible material options.
Stainless Steel
304 / 304L
316 / 316L
321 / 321H
347 / 347H
310S
904L
Duplex & Super Duplex
S31803 / 2205
S32205
S32750 / 2507
S32760
S31254 / 254SMO
Nickel Alloys
Inconel 600 / 625
Incoloy 800H / 825
Hastelloy C276 / C22
Monel 400
Alloy 20
Nickel 200 / 201
Titanium & Copper Alloys
Titanium Grade 2
C70600
C71500
C68700
C44300
C12200
Custom Sizes & Non-standard Requirements
Based on drawings or technical specifications
| Requirement | DLSS Support |
|---|---|
| Outside Diameter | Custom OD according to project requirements |
| Wall Thickness | Thin-wall and thick-wall options |
| Length | Fixed length, random length, extra-long tubes |
| U Tube Radius | Custom bending radius based on drawing |
| Finned Tube Design | Low fin, spiral fin, corrugated tube options |
| Flange Size | Non-standard thickness, bore, length, facing |
| Tube Sheet | Drilling, machining, drawing-based production |
| Packing | Wooden case, bundle, export seaworthy packing |
Special Supply for Heat Exchanger Projects
Heat Exchanger Tubes
Straight tubes for condensers, boilers, evaporators, and pressure equipment.
U Tubes
Custom bending radius, fixed leg length, stress relief heat treatment, and wooden case protection.
Low Finned Tubes
For heat transfer efficiency improvement in condensers, coolers, and boiler-related equipment.
Tube Sheets
Customized drilling, machining, material matching, and drawing-based production.
Flanges & Fittings
Matching flanges, elbows, reducers, tees, forged fittings, and project piping components.
For replacement projects, DLSS can help match the original material, size, inspection standard, and packing method to reduce project risk.
Inspection & Project Documents Available
| Inspection / Document | Available Support |
|---|---|
| MTC | EN 10204 3.1 / 3.2 |
| PMI | Positive Material Identification |
| UT | Ultrasonic Testing |
| ET | Eddy Current Testing |
| HT | Hydrostatic Test |
| Flattening / Flaring | For tube quality verification |
| Visual Inspection | Surface and dimension checking |
| TPI | BV, SGS, TUV, LR, ABS, DNV etc. |
| Packing Documents | Packing list, photos, marking, shipping documents |
How DLSS Supports Special Projects
How to Ensure NACE
Introduction Sour gas environments—containing hydrogen sulfide (H₂S)—pose one of the greatest challenges for stainless steel tubes in the oil and gas industry. The presence of H₂S increases the risk of sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC), which can lead to catastrophic failures if materials are not selected and tested properly. To mitigate these […]
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ASME SA213 TP316H Seamless
Product Overview: ASME SA213 TP316H Seamless Tube ASME SA213 TP316H is a high-performance austenitic stainless steel seamless tube specifically designed for applications in high-temperature and highly corrosive environments. Widely used in critical industrial systems such as heat exchangers, boilers, condensers, and high-pressure fluid systems, this material meets the stringent standards set by ASTM A213 / […]
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Electropolished Stainless Steel Tubes
DLSS supplies 304L and 316L electropolished stainless steel tubes for clean and high-purity piping systems. Our EP tubes are used in pharmaceutical, biotechnology, semiconductor, food, and laboratory projects. Inner surface roughness of Ra ≤ 0.20 μm is available for selected sizes. We can also provide Ra test reports, borescope inspection, material records, and clean packing. […]
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Hygienic Stainless Steel Tubes
Hygienic stainless steel tubes are used in clean process systems. They are common in food, beverage, dairy, cosmetics, biotechnology, and pharmaceutical plants. These systems need clean inner surfaces, good corrosion resistance, and safe material traceability. For buyers, tube selection is not only about size and price. The key question is: Can this tube stay clean […]
Read MoreTypical Special Requests from Our Customers
| Customer Request | DLSS Response |
|---|---|
| “We need nickel alloy tubes urgently.” | Check stock, mill schedule, and air shipment option |
| “The size is not standard.” | Review drawing and confirm production feasibility |
| “We need U tubes with fixed radius.” | Confirm radius, leg length, heat treatment, and packing |
| “The end user requires TPI.” | Coordinate BV, SGS, TUV, LR, ABS, or DNV inspection |
| “We only need a small quantity.” | Check sample, trial order, or small-batch support |
| “We need replacement tubes for an old exchanger.” | Match material, size, standard, and inspection requirements |
FAQ
Yes. DLSS can support customized OD, wall thickness, length, bending radius, flange dimensions, and drawing-based production.
For special materials or replacement projects, DLSS can check stock, sample availability, or small-batch production based on the requirement.
Yes. DLSS can coordinate third-party inspection such as BV, SGS, TUV, LR, ABS, and DNV according to project requirements.
Please provide material grade, size, quantity, drawing, standard, inspection requirement, delivery time, and destination port.
For urgent replacement or maintenance projects, DLSS can help check stock, production feasibility, packing schedule, and air shipment options.
DLSS can help review the project condition and discuss possible material options, but final material selection should be confirmed by the project engineer or end user.
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