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Cryogenic LNG 254SMO Nickel Alloy Concentric Reducer 6x4

  • Cryogenic LNG 254SMO Nickel Alloy Concentric Reducer 6x4
  • Cryogenic LNG 254SMO Nickel Alloy Concentric Reducer 6x4
  • Cryogenic LNG 254SMO Nickel Alloy Concentric Reducer 6x4
Place of Origin Cangzhou, Hebei, China
Brand Name HENGYU
Certification ISO 9001:2015, PED 2014/68/EU, EN 10204 3.1
Model Number NAR-RD-254SMO-6X4
Minimum Order Quantity 1 Piece
Price USD 320-560 / Piece
Packaging Details Plywood case with waterproof paper, steel strip and sea worthy export packing
Delivery Time 7-10 days for stock sizes, 20-25 days for production
Payment Terms T/T,L/C at sight,D/P at sight
Supply Ability 800 Tons per Month
Product Details
Product Name Cryogenic LNG Nickel Alloy Concentric Reducer Application LNG Receiving Terminal And Cryogenic Pipeline
Material Grade 254SMO, UNS S31254, Inconel 625 Optional Size 6 Inch X 4 Inch
Schedule SCH40S Wall Thickness 7.11 Mm SCH40S
Service Temperature Minus 196 C Impact Test Charpy V Notch At -196 C
Standard ASME B16.9, ASTM A403 End Connection Beveled End
Highlight

Cryogenic LNG Reducer

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254SMO Nickel Alloy Reducer

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6x4 Concentric Pipe Reducer
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Product Description
Cryogenic LNG Concentric Reducer — 254SMO, 6 x 4 Inch

LNG piping runs at minus 162 °C, and the fittings must remain tough at that temperature rather than turning brittle. This concentric reducer is produced in 254SMO (UNS S31254), a high-molybdenum austenitic stainless steel with a PREN above 43, and it is impact tested at minus 196 °C to cover the full cryogenic range, including loading line boil-off conditions.

Cryogenic service also punishes anything with a sharp geometry change, so the size head is formed with a generous transition radius and the bore is ground smooth after pickling to remove the laps that would act as stress raisers. Where the specification calls for a nickel-base alloy instead, the same concentric reducer is produced in Inconel 625 in 6 x 4 inch for the highest chloride and fatigue duty.

Technical Specification
Material 254SMO, UNS S31254, 6% Mo austenitic
Alternative Inconel 625, UNS N06625 on request
PREN 43 or above
Size 6 Inch x 4 Inch, DN150 x DN100
Schedule SCH40S, SCH10S available
Service Temperature minus 196 °C to 400 °C
Impact Test Charpy V-notch at −196 °C, 40 J minimum
Standard ASME B16.9, ASTM A403
Ends Beveled end, bore ground and pickled
Design, Inspection and Application Highlights
  • Cryogenic toughness: the austenitic structure of 254SMO keeps impact energy high at minus 196 °C, so the concentric reducer does not embrittle at LNG temperature.
  • Chloride resistance: a PREN above 43 suits coastal terminals and splash-zone areas where 316L would pit within a few years.
  • Smooth transition: the internal radius and ground bore reduce stress concentration at the size change, which is the point where cryogenic fatigue cracks normally start.
  • Welding package: a low heat input procedure and matching filler recommendation are supplied with the order so the LNG concentric reducer can be welded without field trials.
  • Application fit: LNG receiving terminals, loading arms, tanker manifolds, cold boxes, air separation plants and liquid nitrogen distribution.
Frequently Asked Questions
Why is 254SMO used rather than 304L for LNG piping?

304L becomes marginal where LNG is combined with coastal chlorides and thermal cycling. 254SMO with 6 percent molybdenum keeps both cryogenic toughness and pitting resistance, so the concentric reducer covers the whole duty.

Is Inconel 625 available in the same size?

Yes. The 6 x 4 inch concentric reducer can be produced in Inconel 625 when the project specifies a nickel-base alloy, with longer lead time and higher cost.

What impact energy is guaranteed at minus 196 °C?

A minimum average of 40 J on three specimens, with no single value below 28 J, tested from the same heat as the delivered fitting.

How is the bore prepared for cryogenic service?

After forming and pickling, the inside surface of the concentric reducer is ground to remove laps and heat tint, then re-passivated so the roughness and the passive film are both controlled.

Can the reducer be supplied with a third-party witness test?

Yes. Witnessing of the impact test and the dimensional inspection by a nominated inspection body can be arranged when the LNG concentric reducer order is placed.

Send the design temperature, medium and chloride level, and we will confirm whether 254SMO, Inconel 625 or a super duplex grade is the right choice for your cryogenic concentric reducer.

Tags:

Concentric Pipe Reducer

Pipe Reducer Fittings

Butt Weld Reducer