When To Use Slip-on Flange

By Author: Jeeten Gupta
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When to Use Slip-On Flange
Slip on Flanges has a Flat or Raised Face. Slip on Flange also known as Hubbed Flanges is easy to recognize due to its slim and compact shape. This Flange Inner Pipe’s Diameter is Bigger than the Outside diameter. The Outside Diameter of a Slip-on Flange is shorter than the bore Size.
Slip on flanges are connected to the pipe via Fillet weld from the top. They're manufactured with an inside diameter that is slightly bigger than the pipe's outside diameter. These attachments are connected to the pipe via fillet weld at the top and bottom of the flange. 
Slip on pipe flanges are typically provided with a raised or flat face. Smooth Finishing, Corrosion Resistant, Wear and Tear Resistant are some of the key Features of Slip-on Flange.
Compared to other Flanges ...
... a slip-on flange has lower weight which saves space during installation which provides a good sealing performance which ensures no leakage onto the head part.
 
Materials used for making a Slip-on Flange:

Stainless Steel
Aluminum
Brass
Alloy Steel
Plastics
Titanium
Carbon Steel
Monel’s etc.

 
 
How to Measure Slip-on Flange
 
To measure any flange whether, slip-on flange or weld neck, one must consider some important factor in mind which are given below

OD: Outside Diameter
BC: Bolt Circle
HD: Hole Diameter
ID: Inside Diameter

 
Dimensions and Specifications of Slip-on Flanges is shown in this article:
 
Features of a Slip-On Flange:

Slip-on Flange has a smooth Finishing
Has High Performance Level
Is Corrosion as well as Wear and Tear Resistant
Slip-on Flange is not preferred for high pressure or high temperatures
One size fits all pipe schedules

 
Advantages of Using a Slip-On Flange:

Installing a Slip-on Flange requires low cost and has Low maintenance cost.
Another benefit of a slip-on flange is that it prevents leakage and provides a leakage proof installation
Easy to align than weld neck flange because of lower thickness
As Slip-on Flange is welded both inside and outside, therefore it provides a stronger strength
Slip-on Flange requires less time to be spent on ensuring the accuracy of the cut pipe

 
When to use Slip-on Flange:
 
Slip-On Flanges are preferred by some contractors, over the Weld-neck, because of the lower initial cost. The strength of the slip-on flange is ample for its rating, but its life under fatigue conditions is considered to be only one-third that of the weld-neck flange.

The slip-on flange may be attached to the end of a piece of pipe or to one or more ends of a pipe fitting. The slip-on flange is positioned so the inserted end of the pipe or fitting is set back or short of the flange face by the thickness of the pipe wall plus 1/8 of an inch. This allows for a fillet weld inside the SO flange equal to the thickness of the pipe wall without doing any damage to the flange face. The back or outside of the flange is also welded with a fillet weld.

A variation of the Slip-On flange also exists. This is the Slip-On Reducing Flange. This is simply a larger (say a 14") Slip-On flange blank that, instead of the Center (pipe) hole being cut out (or drilled out) for 14" pipe it is cut out for a 6" (or some other size) pipe. The SO Reducing flange is basically used for reducing the line size where space limitations will not allow the length of a weld neck flange and reducer combination. The use of the Slip-On Reducing Flange should only be used where the flow direction is from the smaller size into the larger size.
 
Slip-on Flanges Manufacturer in India
 
Slip-On Flange Applications and Uses:

Slip-On Flange uses in Pipeline engineering
Slip-On Flange uses in Oil & gas industry
Slip-On Flange uses in Mechanical engineering
Slip-On Flange uses in Plant engineering
Slip-On Flange uses in the Marine industry
Slip-On Flange uses in the Wastewater management
Slip-On Flange uses in the Chemical industry
Slip-On Flange uses in the Petrochemical industry
Slip-On Flange uses in the Power industry
Slip-On Flange uses in the Aerospace industry
Slip-On Flange uses in the Food processing industry and many more.

 
More Resources:

Dimensions and Specifications of Long Weld Neck Flanges
Applications and Uses of Lap Joint Flanges
Class of Slip-on Flanges
Blind Flanges Uses and Applications