Slip-on flanges, also known as slip-in flanges, are widely used in piping systems for their ease of installation and cost-effectiveness. These flanges are designed to slip over the end of a pipe or fitting, making them a popular choice in various industries. As a leading slip-on flange manufacturer, we understand the importance of providing high-quality flanges that offer strength, durability, and easy integration into piping systems.
In this blog, we will delve into the different types, specifications, dimensions, weights, and industrial uses of slip-on flanges, showcasing why Kalpataru Piping Solutions stands out as the top slip-on flanges manufacturer in India for these essential components.
What is slip on flanges?
Slip-on flanges or slip-in flanges, are a popular choice due to their cost-effectiveness and ease of installation. They offer ample strength, performing well even under fatigue conditions like weld neck flanges. These slip on weld neck flanges attach easily to the end of a pipe or fitting, simplifying installation without damaging the flange face. They can also serve as lap-joint flanges for Type B or Type C ends.
Stainless Steel 304 slip-on flanges are available in various diameters and low-pressure models. They require double welding but lack a neck to rest on the pipe. These flanges feature a low-profile hub and are typically connected to a pipe with one or two fillet welds, although a single weld can suffice. However, their usage is limited due to lower weld integrity as there is no full penetration weld between the pipe and the flange.
How do Slip-on Flanges Work?
Slip-on flanges work by sliding onto the end of a pipe or fitting and then being welded in place. The slip-on flange welding process involves creating a filet weld around the outer circumference of the flange and between the flange and the pipe. This weld ensures a secure connection and prevents leakage.
When using slip-on flanges, the pipe’s end is typically set back by the thickness of the pipe wall plus 1/8 of an inch to allow for easy fitting of the flange. This setup facilitates easy installation without exerting excessive effort or causing damage to the flange face.In contrast, slip-on weld neck flanges have a neck portion that extends from the flange, which provides additional support and strength to the connection. The slip-on flange welding process involves welding both the neck and the back of the flange to the pipe, ensuring a robust and reliable joint.
Slip-on Flanges Dimensions
|
ge Size (Nominal Pipe Size) |
Outside Diameter (OD) |
Thickness (T) |
Raised Face Diameter (R) |
Number of Bolt Holes |
Bolt Hole Diameter (BD) |
|
1/2″ (15mm) |
3.50″ (89mm) |
0.44″ (11mm) |
1.38″ (35mm) |
4 |
0.62″ (16mm) |
|
3/4″ (20mm) |
3.88″ (98mm) |
0.50″ (13mm) |
1.69″ (43mm) |
4 |
0.62″ (16mm) |
|
1″ (25mm) |
4.25″ (108mm) |
0.56″ (14mm) |
2.00″ (51mm) |
4 |
0.62″ (16mm) |
|
1-1/4″ (32mm) |
4.63″ (117mm) |
0.62″ (16mm) |
2.38″ (60mm) |
4 |
0.62″ (16mm) |
|
1-1/2″ (40mm) |
5.00″ (127mm) |
0.69″ (17mm) |
2.75″ (70mm) |
4 |
0.75″ (19mm) |
|
2″ (50mm) |
6.00″ (152mm) |
0.75″ (19mm) |
3.50″ (89mm) |
4 |
0.75″ (19mm) |
|
2-1/2″ (65mm) |
7.00″ (178mm) |
0.88″ (22mm) |
4.00″ (102mm) |
4 |
0.75″ (19mm) |
|
3″ (80mm) |
7.50″ (191mm) |
0.94″ (24mm) |
4.50″ (114mm) |
4 |
0.75″ (19mm) |
|
4″ (100mm) |
9.00″ (229mm) |
1.00″ (25mm) |
5.50″ (140mm) |
8 |
0.75″ (19mm) |
|
5″ (125mm) |
10.00″ (254mm) |
1.06″ (27mm) |
6.50″ (165mm) |
8 |
0.88″ (22mm) |
|
6″ (150mm) |
11.00″ (279mm) |
1.12″ (29mm) |
7.50″ (191mm) |
8 |
0.88″ (22mm) |
|
8″ (200mm) |
13.50″ (343mm) |
1.25″ (32mm) |
9.50″ (241mm) |
8 |
0.88″ (22mm) |
|
10″ (250mm) |
16.00″ (406mm) |
1.38″ (35mm) |
11.75″ (298mm) |
12 |
1.00″ (25mm) |
|
12″ (300mm) |
19.00″ (483mm) |
1.50″ (38mm) |
14.25″ (362mm) |
12 |
1.00″ (25mm) |
Slip On Flange Specification
|
Specification |
Description |
|
Material |
Carbon steel, stainless steel, alloy steel, etc. |
|
Size Range |
1/2 inch to 48 inches |
|
Pressure Rating |
Class 150, Class 300, Class 600, etc. |
|
Facing |
Raised face (RF), flat face (FF), ring type joint (RTJ) |
|
Standards |
ASME B16.5, ASME B16.47, API 6A, etc. |
|
End Connection |
Slip-on (SO), weld neck (WN), threaded (THD), etc. |
|
Applications |
Petrochemical, oil and gas, water treatment, etc. |
|
Features |
Easy installation, cost-effective, low-pressure use |
Slip on Flanges Types
Lets learn more about the Slip on Flanges Types , each designed for specific applications.
- Standard Slip-On Flange (SO): This is the most common type, featuring a plain bore and a hub that extends from the flange’s flat face. It is used for low-pressure applications and is easy to install.
- Raised Face Slip-On Flange (RF): Similar to the standard SO flange, the RF slip-on flange has a raised face on the mating surface. This raised face provides a better seal when connecting to a matching raised face flange.
- Flat Face Slip-On Flange (FF): The FF slip-on flange has a flat face on the mating surface, making it suitable for connecting to flat face flanges. It provides a smooth and even surface for the flange joint.
- Ring Type Joint Slip-On Flange (RTJ): RTJ slip-on flanges feature a groove on the mating surface with a metal ring gasket. This design allows for high-pressure and high-temperature applications where a reliable seal is essential.
- Specialty Slip-On Flanges: There are specialized slip-on flanges designed for specific purposes, such as reducing slip-on flanges (used to transition between different pipe sizes), spectacle blind slip-on flanges (incorporating a blind flange element), and others tailored to unique requirements in piping systems.
Slip on Flange Weight
|
Nominal Pipe Size (NPS) |
Flange Size (inches) |
Flange Thickness (inches) |
Flange Weight (lbs) |
|
1/2 |
1.88 |
0.38 |
0.5 |
|
3/4 |
2.12 |
0.44 |
0.75 |
|
1 |
2.5 |
0.5 |
1.25 |
|
1 1/4 |
2.88 |
0.56 |
1.75 |
|
1 1/2 |
3.12 |
0.62 |
2.25 |
|
2 |
3.5 |
0.75 |
3.25 |
|
2 1/2 |
4 |
0.88 |
5 |
|
3 |
4.62 |
1 |
6.5 |
|
3 1/2 |
5 |
1.12 |
8 |
|
4 |
5.25 |
1.25 |
10 |
|
5 |
6 |
1.38 |
13 |
|
6 |
6.75 |
1.5 |
16 |
|
8 |
8 |
1.75 |
24 |
|
10 |
10.25 |
2 |
37 |
|
12 |
12.25 |
2.25 |
53 |
|
14 |
13.75 |
2.5 |
75 |
|
16 |
15 |
2.75 |
96 |
|
18 |
16.5 |
3 |
120 |
|
20 |
18 |
3.25 |
155 |
|
24 |
21.25 |
3.75 |
235 |
Advantages of Slip On Flanges
Slip-on flanges offer several advantages:
- Cost-Effective: They are economical due to simpler manufacturing processes.
- Ease of Installation: They slide easily onto pipes, reducing installation time and effort.
- Versatility: Suitable for low-pressure applications across various industries.
- Simple Welding: Requires only fillet welding, making it straightforward to join to pipes.
- Space-Saving: The slip-on design has a low profile, ideal for space-constrained environments.
- Interchangeability: Compatible with different flange faces, such as RF, FF, and RTJ, enhancing flexibility in piping systems.
Slip On Flanges Uses
Slip-on flanges are ideal for low-pressure systems, offering minimal leakage risk. They are commonly used in cooling water lines, firefighting systems, and low-pressure compressed air lines. These flanges are also suitable for process lines handling steam, oil, gas, and condensates, especially in low-pressure and high-temperature environments. However, they are best suited for applications with minimal pressure requirements and working conditions.
