High-Strength Pipeline Flange Solutions
Mss sp-44 refers to the steel pipeline flanges specifications covers pressure-temperature ratings, materials, dimensions, tolerances and testings.
High-Strength Pipeline Flange Solutions
Mss sp-44 refers to the steel pipeline flanges specifications covers pressure-temperature ratings, materials, dimensions, tolerances and testings.
MSS SP-44 Flanges are high-strength steel pipeline flanges designed for demanding industrial applications, including oil, gas, and petrochemical systems. Compliant with MSS SP-44 standards, they ensure durability as of August 22, 2025, 08:05 PM PDT.
These Pipeline Flanges range from NPS 12 to 60, with pressure ratings from Class 150 to 900 and temperature tolerance up to 538°C. They are forged for superior strength.
MSS SP-44 Flanges undergo tensile, hardness, and hydrostatic testing for quality assurance. Coatings like 3LPE or FBE enhance corrosion resistance, ideal for harsh environments as of August 2025.
Compared to ASME B16.5, MSS SP-44 Flanges cover larger sizes (NPS 26–60) and offer tailored high-strength options, with a service life of 20–40 years with maintenance.
MSS SP-44 Flanges address challenges like pipeline wear and high-pressure leaks, providing reliable industrial piping solutions as of August 22, 2025.
| Element | Percentage (%) | Function |
|---|---|---|
| Carbon (max) | 0.30 | Enhances strength and hardness |
| Manganese (max) | 1.35 | Improves toughness and ductility |
| Phosphorus (max) | 0.035 | Reduces brittleness |
| Sulfur (max) | 0.040 | Enhances machinability |
| Silicon (max) | 0.15–0.50 | Increases strength and elasticity |
MSS SP-44 Flanges use this composition, with "killed" steel ensuring high-quality performance in pipelines.
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength (min) | 415 MPa | ASTM A370 |
| Yield Strength (min) | 414 MPa | ASTM A370 |
| Elongation (min) | 20% | ASTM E8 |
| Hardness (Brinell) | 120–150 HB | ASTM E10 |
| Impact Toughness (min) | 27 J at -45°C | ASTM E23 |
| Temperature Range | -45°C to 538°C | N/A |
These properties, varying by grade (F36–F80), make MSS SP-44 Flanges suitable for high-pressure and temperature applications.
| Standard | Material | Size Range | Pressure Rating | Key Advantage |
|---|---|---|---|---|
| MSS SP-44 | Forged Steel | NPS 12–60 | Class 150–900 | High-Strength for Large Pipes |
| ASME B16.5 | Forged Steel | 1/2”–24” | Class 150–2500 | Wide Pressure Range |
| ASME B16.47 | Forged Steel | 26”–60” | Class 150–900 | Large Diameter Options |
| API 6A | Alloy Steel | 1-13/16”–30” | 2000–20,000 PSI | Extreme Pressure Resistance |
MSS SP-44 Flanges excel in large, high-strength pipelines, while ASME B16.5 offers versatility, ASME B16.47 covers large diameters, and API 6A suits extreme pressures as of August 22, 2025.
| Unit System | NPS 12 | NPS 14 | NPS 16 | NPS 18 | NPS 20 | NPS 22 | NPS 24 | NPS 26 | NPS 28 | NPS 30 | NPS 32 | NPS 34 | NPS 36 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DN (mm) | 300 | 350 | 400 | 450 | 500 | 550 | 600 | 650 | 700 | 750 | 800 | 850 | 900 |
| Unit System | NPS 38 | NPS 40 | NPS 42 | NPS 44 | NPS 46 | NPS 48 | NPS 50 | NPS 52 | NPS 54 | NPS 56 | NPS 58 | NPS 60 | — |
| DN (mm) | 950 | 1000 | 1050 | 1100 | 1150 | 1200 | 1250 | 1300 | 1350 | 1400 | 1450 | 1500 | — |
NPS (Nominal Pipe Size): Imperial unit (inches, e.g., NPS 12 = 12 inches), used in American/Canadian piping systems (compliant with ASME B36.10/B36.19); - DN (Nominal Diameter): Metric unit (millimeters, e.g., DN 300 = 300 mm), adopted in global standards (ISO, EN, GB) for unified size reference. There are six most commonly used flanges, also knows as ANSI Flange, ASME B16.5 Flange. However, these designs can be modified to meet the specific functions and requirements of the applications. Therefore, it’s essential to understand the pressure at the flagged joint, the required strength, and the size of pipes involved. With the correct information comes six types of flanges that an individual can choose from. These include:
The most common type, featuring a raised sealing surface that concentrates the bolting force on a smaller area.
Has a flat sealing surface, commonly used with cast iron flanges and for low-pressure applications.
Features a groove for metal ring gaskets (oval or octagonal), providing metal-to-metal sealing.
Features matching tongue and groove surfaces, providing self-alignment and confined gasket area.
Flange faces have to be smooth enough to ensure a tight, leak-free seal for bolted flanges.
| Flange Face Type | Flange Face Type | Flange Face Type |
|---|---|---|
| Type A: flat face | Type D: groove face | Type G: O Ring recess |
| Type B: raised face | Type E: spigot | Type H: O Ring groove |
| Type C: tongue face | Type F: recess |
| ASME B16.5 | Pipe Flanges NPS 1/2 - 24 |
| ASTM A105 | Forged Carbon Steel |
| ASTM A350 LF2 | Low-Temperature Service |
| ASTM A182 | High-Temperature Service |
| ASTM A694 | High-Pressure Transmission |
| DIN EN 1092-1 | European Standard PN 2.5-400 |
Most commonly used, forged with machined surfaces
Corrosion resistant, grades 304, 316, etc.
High-temperature and high-pressure applications
Cast iron, aluminum, brass, bronze, plastic
| Material Category | Fittings (ASTM Grade) | Flanges (ASTM Grade) | Valves (ASTM Grade) | Bolts & Nuts (ASTM Grade) |
|---|---|---|---|---|
| Carbon Steel | A234 Gr WPA | A105 | A216 Gr WCB | A193 Gr B7 A194 Gr 2H |
| A234 Gr WPB | A105 | A216 Gr WCB | ||
| A234 Gr WPC | A105 | A216 Gr WCB | ||
| Carbon Steel
Alloy (High-Temperature) |
A234 Gr WP1 | A182 Gr F1 | A217 Gr WC1 | A193 Gr B7 A194 Gr 2H |
| A234 Gr WP11 | A182 Gr F11 | A217 Gr WC6 | ||
| A234 Gr WP12 | A182 Gr F12 | A217 Gr WC6 | ||
| A234 Gr WP22 | A182 Gr F22 | A217 Gr WC9 | ||
| A234 Gr WP5 | A182 Gr F5 | A217 Gr C5 | ||
| A234 Gr WP9 | A182 Gr F9 | A217 Gr C12 | ||
| Carbon Steel
Alloy (Low-Temperature) |
A420 Gr WPL6 | A350 Gr LF2 | A352 Gr LCB | A320 Gr L7 A194 Gr 7 |
| A420 Gr WPL3 | A350 Gr LF3 | A352 Gr LC3 | ||
| Austenitic Stainless Steel | A403 Gr WP304 | A182 Gr F304 | A182 Gr F304 | A193 Gr B8 A194 Gr 8 |
| A403 Gr WP316 | A182 Gr F316 | A182 Gr F316 | ||
| A403 Gr WP321 | A182 Gr F321 | A182 Gr F321 | ||
| A403 Gr WP347 | A182 Gr F347 | A182 Gr F347 |
ASTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".
The usual materials of flanges include stainless steel, carbon steel, aluminum and plastic. The choice of the material largely depends on the purpose of the flange. For example, stainless steel is more durable and is necessary for heavy use. On the other hand, plastic is more feasible for use in the home because of its reasonable price and easy installation. The materials used for flanges are under the designation of the American Society of Mechanical Engineers.
The most common materials for pipe flanges (forged grades) are: ASTM A105 (carbon steel high temperature to match A53/A106/API 5L pipes), A350 Grades LF1/2/3 (carbon steel low temperature to match A333 pipes), A694 Grades F42 to F80 (high yield carbon steel to match API 5L pipe grades), ASTM A182 Grades F5 to F91 (alloy steel flanges to match A335 pipes), A182 Grade F304/316 (stainless steel flanges to match A312 SS pipes), A182 Gr. F44/F51/F53/F55 (duplex and super duplex to match A790/A928 pipes) and various nickel alloy grades (Inconel, Incoloy, Hastelloy, Monel).
The material qualities for these flanges are defined in the ASTM standards.
Metal flanges are classified from 150 to 2500 # rating for different pressure applications.
Incoloy 825 Flange
Industries Using
The basic application of the MSS SP-44 flange to connect pumps, pipes, valves, and other equipment, often using butt welds, to make a pipework system.
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