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Coupling 5.5″ 23# 2550-125 VAM TOP HC

These 5.5″ 23# 2550-125 VAM TOP HC couplings are made from Alloy 2550 (UNS N06255), a cold-hardened nickel-based alloy engineered for extreme sour service in environments with high H₂S and chloride content, and rated for use up to 400°F. With elevated levels of nickel and molybdenum, this alloy delivers exceptional resistance to chloride-induced corrosion, dissolved oxygen, and acid gas conditions, making it ideal for HPHT wells, saltwater injection, and AGI applications. The VAM TOP HC connection provides high-compression sealing performance, ensuring reliability in the most demanding downhole operations.

Available Quantity

235

Unit

Condition

Unused

Mill Year

Manufacturer

CRA Finished Tubes

Location

Texas, USA

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What is PipeFacts?

Field Inspection

Completed!

Receiving Inspection

Completed!

Final Inspection

In Progress

Certified Report

Not Started

Receiving Inspection Complete!

During this phase of PipeFacts™, material is received into one of our regional storage and inspection hubs, and we put material through a more detailed inspection. Our teams of inspectors inspects the pipe body for traceability and potential body defects and inspects the threads while a quality team in the office evaluates the as produced specification of the material test reports (MTRs).

What is

Receiving Inspection

?

100%
  • Visual Body Inspection (VBI)
  • Tally
  • Traceability to MTRs
5%
  • Visual Thread Inspection
  • Drift

Size

Nominal OD

5.5

in.

Nominal ID

4.67

in

Nominal Wall Thickness

0.415

in

Drift

4.545

in

Special Drift

—

in

Strength

Minimum Yield Strength

125

KSI

Minimum Ultimate Tensile Strength

135

KSI

Collapse Pressure

16,060

PSI

Internal / Burst Pressure

16,510

PSI

Disclaimer: The burst and collapse figures displayed are based on the API dimension tolerance of 87.5% of nominal wall thickness. Note that martensitic, duplex, super duplex, and nickel alloys often have tighter dimensional tolerances, therefore, increased strength ratings. The properties do not factor connection performance ratings. If your application requires more information ratings, please contact our technical services team, and we happily assist you.

Alloy

2550

Family

Nickel Alloy

Corrosion Resistance Level

Severe

Alloy Description

Alloy 2550 (UNS N06255) is a cold-hardened nickel-based alloy designed for corrosion resistance in highly sour (H2S) environments with high chloride levels, offering high strength up to 400°F.

With its elevated nickel and molybdenum content, 2550 Alloy enhances the sour service performance of nickel alloys while providing superior protection against chlorides and dissolved oxygen. This makes it ideal for use in downhole tubular components, packers, and other subsurface equipment in severely sour wells under high-pressure, high-temperature (HPHT) conditions, as well as in saltwater injection wells and Acid Gas Injection (AGI) wells. However, careful consideration of all environmental factors, such as H2S, CO2, temperature, pH, and chloride concentration, is essential before selecting the final material.

For sour service applications, Alloy 2550 is categorized as a type 4d alloy in MR0175/ISO15156, with no limitations on H2S partial pressure below 300°F, and it can withstand 300 psi H2S at 425°F.

Elemental Composition

C
6
Carbon
0.03%
Si
14
Silicon
1%
P
15
Phosphorus
0.03%
S
16
Sulfur
0.03%
Ti
22
Titanium
0.69%
Cr
24
Chromium
23%‒26%
Mn
25
Manganese
1%
Fe
26
Iron
6.02%‒24%
Ni
28
Nickel
47%‒52%
Cu
29
Copper
1.2%
Mo
42
Molybdenum
6%‒9%
W
74
Tungsten
3%

Name

VAM TOP HC

Licensee

VAM

Category

Premium

Thread Type

Threaded & Coupled

Description

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