Lap Joint Flange Asme B16 5
High-temperature steam pipeline: Main steam system of a thermal power plant (P≤2500psi · T≤538 ° C)
Frequent maintenance systems: Petrochemical reactor inlet and outlet · Refinery pump and valve assembly · Pharmaceutical CIP cleaning pipeline
Precious metals pipeline: Nickel-based alloy/titanium alloy delivery pipeline + carbon steel flange body combination, cost optimization by 40%
- Product Introduction
ASME B16.5 standard Lap Joint Flange
Free rotation · Thermal stress compensation · Economical and efficient - a smart solution for flexible connections in industrial piping
Compliant with the latest ASME B16.5-2020 standard · Supports full-class customization from Class 150 to 2500 · Universal interchangeable for global piping systems
As an ASME-certified flange manufacturer, we have a deep understanding of the complex requirements for flexibility, maintainability and cost control in piping systems under complex working conditions. The ASME B16.5 lap flange (LJF), with its loose two-component design at its core, perfectly addresses the challenges of frequent disassembly and assembly, thermal displacement compensation, and precise alignment of bolt holes, making it an ideal choice for high-pressure and high-temperature systems such as petrochemical, energy, and shipping.
Product structure and Working principle
Unique two-component design
|
Components |
Materials and Functions |
Manufacturing standards |
|
Flange body (Hub) |
Carbon steel (ASTM A105) or stainless steel (ASTM A182) · Inner diameter > Pipe outer diameter · Free to rotate 360° |
ASME B16.5 Table 1A |
|
Stub End |
The same material as the pipe (304/316L stainless steel, etc.) · Butt the pipe at one end · precisely machined flanged sealing surface at the other end |
ASME B16.9 / MSS SP-43 |
Workflow: ① Lap short section butt weld fixed to the pipe → ② The flange body is inserted into the pipe and slides to the flanged short section → ③ Bolts fasten the flange body to the matching flange → Seal between the flanged and the body to form 15.
Core Advantages and Technological Highlights
Quick disassembly and assembly in 10 minutes
The flange body can rotate freely without disassembling pipe welds, bolt hole alignment efficiency increased by 50%, especially suitable for pumps, valves, heat exchangers and other equipment interfaces that require frequent maintenance 5.
Zero thermal stress damage
The non-rigid connection allows the pipe to slide axially, eliminating stress caused by thermal expansion and contraction and protecting the weld from fatigue cracking (applicable temperature range: -196°C to +538°C) 410.
Cost reduction by 40%
The flange body can be made of low-cost carbon steel, with only the lap short section matching the pipe material (such as Hastelloy/titanium alloy), significantly reducing the cost of precious metal systems by 5.
Prefabricated modular Pioneers
Factory pre-welded short sections + on-site bolt connection, engineering installation cycle shortened by 30%, welding quality 100% controllable 10.
Detailed technical Specifications (ASME B16.5 standard)
1. Dimensions and pressure grades
|
Parameters |
Specification range |
|
Nominal diameter (NPS) |
NPS 1/2" - 24" (DN 15-600) · * Extra-large size (NPS 26-60) in accordance with ASME B16.47 standard *45 |
|
Pressure Class |
150 · 300 · 400 · 600 · 900 · 1500 · 2500 |
|
Sealing surface type |
Raised face (RF) | concave-convex face (MFM) | Tenon groove face (TG) | Ring joint face (RTJ) |
|
Short joint type |
Type A (Long Type) | Type B (Short type) | Type C (mortise and tenon Locking type) |
2 Key size table (Class 300 RF example)
|
NPS |
Flange outer diameter (A) |
Center circle of bolt hole (P) |
Number of bolt holes (NBH) |
Flange thickness (C) |
Flanging Angle |
|
2. "" |
6.00" |
4.75" |
8 |
0.62" |
30 ° + / - 0.5 ° |
|
8" |
13.50" |
11.75" |
12 |
1.13" |
30 ° + / - 0.5 ° |
3. Pressure-temperature rating (example: ASTM A105 carbon steel body + 316L short section)
|
Temperature (°C) |
Class 150 (psi) |
Class 300 (psi) |
Class 600 (psi) |
|
-29 |
285 |
740 |
1480 |
|
100 |
260 |
675 |
1350 |
|
200 |
230 |
655 |
1310 |
|
300 |
200 |
635 |
1270 |
4. Material standards
|
Components |
Applicable material standards |
|
Flange body |
Carbon steel: ASTM A105 · Q235B · 20# · Epoxy-coated/galvanized |
|
Lap short joints |
Stainless steel: ASTM A182 F304/316L/321 |
|
Bolts/washers |
ASTM A193 B7 bolts · Flexible graphite gaskets · RTJ metal ring gaskets |
Typical Application Scenarios
High-temperature steam pipeline
Main steam system of a thermal power plant (P≤2500psi · T≤538 ° C)
01
Frequent maintenance systems
Petrochemical reactor inlet and outlet · Refinery pump and valve assembly · Pharmaceutical CIP cleaning pipeline
02
Precious metals pipeline
Nickel-based alloy/titanium alloy delivery pipeline + carbon steel flange body combination, cost optimization by 40%
03
Modular engineering
LNG receiving terminal prefabricated pipe gallery · Ship engine pipeline · Semiconductor high-purity gas system
04
Corrosive medium
316L short section with PTFE lining for hydrochloric acid/sulfuric acid transportation
05
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