Slip-on flange


The Slip-on flange has a low hub because the pipe slips into the flange prior to welding. It is welded both inside and out to provide suffcient strength and prevent leakage. Slip-on flanges are all bored slightly larger than the O.D. of the pipe. They are preferred over welding neck flanges bu many users due to their lower intial cost, but final intallation cost is probably not much less than that of the welding neck flange because of the additional welding involved.
Install a Slip-on Flange
Install a Slip-on Flange
Advantages of slip on flanges:
Low cost installation
Less time needed to spent on ensuring the accuracy of the cut pipe
They are somewhat easier to align
The slip-on flanges have low hub because the pipe slips into the flange before welding
The flange is welded both inside and outside to provide sufficient strength
They prevent leakage
Standards, Dimensions & Weight
Specifications:
Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ

Material:
  • Cabon steel: A105, A350 LF2
  • Stainless steel: A182 F304/F304L/F316/F316L/F321
  • Alloy steel: F11, F12


Packing: plywood case and plywood pallet
Type: SO Forged Flange
Material: Carbon steel: A105,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8, Stainless Steel: F304 F304L F316 F316L 316Ti, Copper etc.
Standard: ANSI,JIS,DIN,BS4504,SABS1123,EN1092-1, UNI,AS2129,GOST-12820
Size: 1/2-78 inch (DN15-DN2000)

Pressure: ANSI class 150,300,600,1500,2500, DIN PN6,PN10,PN16,PN25,PN40,PN64,PN100,PN160
Packing: No Fumigate or Fumigate Plywood/Wood Pallet or Case
Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.

Usage: Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.

How to Install a Slip-on Flange

Install a Slip-on Flange
Install a Slip-on Flange

Slip-on Flange, SO Flange, Slip-On Pipe Flanges


Flanges are most often used to connect pipes that have diameters of more than 2 inches. The flange's joint consists of two matching disks of metal, separated by a gasket, that are bolted together to achieve a secure seal with the gasket material. The flange is attached to the pipe by screwed fittings. The flange uses force provided by the bolts to pre-load the gasket. When internal pressure is applied, there is enough contact stress between the flanges and gasket to maintain a seal.

Check the flange and pipe to make sure there is no damage that may prevent a proper seal from being formed.

Slide the slip-on flange onto the pipe using your hand. Determine where you will be welding the flange to the pipe. In most cases, you will be welding the flange to the end of the pipe.

Use a welder to weld the inside and outside of the flange to the pipe. This will create a strong seal between the pipe and flange.

Perform a pressure test to ensure the welded seal does not leak. Turn on the water leading to the pipe and observe the pipe for any leaks.

How to Use Slip-On Flanges on a Steam Pipe

A pipe flange is a type of pipe fitting, commonly used in plumbing applications such as installing a toilet or sink. Pipe flanges connect steel pipes to a valve choke or other equipment piece. Fitting the pipe flange to a steel pipe is a relatively simple process to do, with the right equipment.

Select the flange size that is appropriate to the steel pipe. The fit needs to be snug and not loose. The slip-on flange consists of a bored hole with a diameter just slightly larger than the steel pipe.

  1. Slip the flange over the end of the pipe base.
  2. Thread the flange pins to tighten the flange's grasp on the pipe. The pins will keep the pipe securely in place inside the flange. There are usually six to eight pins in place. Use a screwdriver to tighten the pins all the way.
  3. Try to pull the pipe out of the flange to make sure that the pins are efficiently tightened. If they aren't, re-tighten them with the screwdriver. Inspect the pins to make sure they are down all the way and that the pipe cannot move inside the flange.
  4. Use a hammer to slightly tap the flange in place. The flange face should be flush with the end of the steel pipe.
  5. Use a 12-inch wrench with 85 pounds force to tighten the pins. Apply 80 to 85 foot-per-pounds torque on the pins, or until the pin heads break off.
  6. Lubricate the gasket of the pipe and stretch it over the pipe end, with the beveled edge positioned in the field flange.

What are ASTM Grades?

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".
For example, a carbon steel pipe can be identified with Grade A or B, a stainless-steel pipe with Grade TP304 or Grade TP321, a carbon steel fitting with Grade WPB etc..
Below you will find as an example 3 tables with chemical requirements for:
  1. Flanges according to ASTM A182 Grade F304, F304L F316L
  2. Pipes according to ASTM A312 Grade TP304, TP304L, TP3016L
  3. Fittings according to ASTM A403 Grade WP304, WP304L, WP316L
Furthermore, a table with frequently used ASTM Grades, arranged on Pipes, Fittings, Flanges, Valves, Bolts & Nuts, which belong together as a group.
As you may be have noted, in the table below, ASTM A105 has no Grade. Sometimes ASTM A105N is described;
N stands not for Grade, but for normalized. Normalizing is a type of heat treatment, applicable to ferrous metals only. The purpose of normalizing is to remove the internal stresses induced by heat treating, casting, forming etc..
Chemical requirements composition, %
Flanges according to ASTM A182
GradeCMnPSSiNiCrMo
F3040.082.00.0450.0301.08.0-11.018.0-20.0 
F304L0.0302.00.0450.0301.08.0-13.018.0-20.0 
F316L0.0302.00.0450.0301.010.0-15.016.0-18.02.0-3.0
Note:
Grades F304, F304L, and F316L shall have a maximum Nitrogen content of 0.10%.

Pipes according to ASTM A312
GradeCMnPSSiCrNiMo
TP3040.082.00.0450.0301.018.0-20.08.0-11.0 
TP304L0.0352.00.0450.0301.018.0-20.08.0-13.0 
TP316L0.0352.00.0450.0301.016.0-18.010.0-14.02.0-3.0
Note:
For small diameter or thin walls or both, where many drawing passes are required, a Carbon maximum of 0.040% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.50 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.20 mm] in average wall thickness (0.044 in. [1.10 mm] in minimum wall thickness).

Fittings according to ASTM A403
GradeC (1)Mn (1)P (1)S (1)Si (1)NiCrMo
WP3040.082.00.0450.0301.08.0-11.018.0-20.0 
WP304L0.030 (2)2.00.0450.0301.08.0-12.018.0-20.0 
WP316L0.030 (2)2.00.0450.0301.010.0-14.0 (3)16.0-18.02.0-3.0
Notes:
(1) Maximum, unless otherwise indicated.
(2) For small diameter or thin walls or both, where many drawing passes are required, a Carbon maximum of 0.040% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.50 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.20 mm] in average wall thickness (0.044 in. [1.10 mm] in minimum wall thickness).
(3) On pierced tubing, the Nickel may be 11.0-16.0%.
Frequently used ASTM Grades
MaterialPipesFittingsFlangesValvesBolts & Nuts
 
Carbon SteelA106 Gr AA234 Gr WPAA105A216 Gr WCBA193 Gr B7
A194 Gr 2H
A106 Gr BA234 Gr WPBA105A216 Gr WCB
A106 Gr CA234 Gr WPCA105A216 Gr WCB
 
Carbon Steel
Alloy
High-Temp
A335 Gr P1A234 Gr WP1A182 Gr F1A217 Gr WC1A193 Gr B7
A194 Gr 2H
A335 Gr P11A234 Gr WP11A182 Gr F11A217 Gr WC6
A335 Gr P12A234 Gr WP12A182 Gr F12A217 Gr WC6
A335 Gr P22A234 Gr WP22A182 Gr F22A217 Gr WC9
A335 Gr P5A234 Gr WP5A182 Gr F5A217 Gr C5
A335 Gr P9A234 Gr WP9A182 Gr F9A217 Gr C12
 
Carbon Steel
Alloy
Low-Temp
A333 Gr 6A420 Gr WPL6A350 Gr LF2A352 Gr LCBA320 Gr L7
A194 Gr 7
A333 Gr 3A420 Gr WPL3A350 Gr LF3A352 Gr LC3
 
Austenitic
Stainless
Steel
A312 Gr TP304A403 Gr WP304A182 Gr F304A182 Gr F304A193 Gr B8
A194 Gr 8
A312 Gr TP316A403 Gr WP316A182 Gr F316A182 Gr F316
A312 Gr TP321A403 Gr WP321A182 Gr F321A182 Gr F321
A312 Gr TP347A403 Gr WP347A182 Gr F347A182 Gr F347
 

ASTM Materials

Pipes
  • A106 = This specification covers carbon steel pipe for high-temperature service.
  • A335 = This specification covers seamless ferritic alloy-steel pipe for high-temperature service.
  • A333 = This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures.
  • A312 = Standard specification for seamless, straight-seam welded, and cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.
Fittings
  • A234 = This specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction.
  • A420 = Standard specification for piping fittings of wrought carbon steel and alloy steel for low-temperature service.
  • A403 = Standard specification for wrought austenitic stainless steel piping fittings.
Flanges
  • A105 = This specification covers standards for forged carbon steel piping components, that is, flanges, fittings, Valves, and similar parts, for use in pressure systems at ambient and higher-temperature service conditions.
  • A182 = This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and Valves and parts for high-temperature service.
  • A350 = This specification covers several grades of carbon and low alloy steel forged or ring-rolled flanges, forged fittings and Valves for low-temperature service.
Valves
  • A216 = This specification covers carbon steel castings for Valves, flanges, fittings, or other pressure-containing parts for high-temperature service and of quality suitable for assembly with other castings or wrought-steel parts by fusion welding.
  • A217 = This specification covers steel castings, martensitic stainless steel and alloys steel castings for Valves, flanges, fittings, and other pressure-containing parts intended primarily for high-temperature and corrosive service.
  • A352 = This specification covers steel castings for Valves, flanges, fittings, and other pressure-containing parts intended primarily for low-temperature service.
  • A182 = This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and Valves and parts for high-temperature service.
Bolds & Nuts
  • A193 = This specification covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
  • A320 = Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low-Temperature Service.
  • A194 = Standard specification for nuts in many different material types.

Packing the pipe flange

Steel flanges must be packed with seaworthy packing method then delivery to customers, usually the packing way include wooden box, wooden pallet, iron & steel cage, iron & steel pallet etc.
big scale forging product
big scale forging product


Steel cage
The packing way of iron & steel cage


Tensile membrane
Tensile-membrane


The packing way of plywood box
The packing way of plywood box


The Rust Prevention for Steel Flanges
The normal rust prevention treatment for steel flanges include yellow (Golden) paint Coating, black paint coating or black phosphating treatment, varnish paint coating, varnish antirust oil coating, electro galvanizing coating (Cold), hot dip galvanizing coating etc.

The Packing Works for Steel Flanges
Steel flanges must be packed with seaworthy packing method then delivery to customers, usually the packing way include wooden box, wooden pallet, iron & steel cage, iron & steel pallet etc. Because of the normal wooden boxes or wooden pallets have to do fumigation treatment, we usually use plywood pallet or plywood case or box to pack steel flanges without fumigation treatment. Whatever plywood or iron & steel packing way, they must be seaworthy, strong, waterproof and easy for loading and unloading.

Shipping mark stick to outside of package.
Dispatch:
The final process of dispatch is the most tedious of all , and heavy duty cranes are used for it. With the help of our extensive delivery chain we can ensure time critical deliveries at the behest of our esteemed clients. We are indeed privileged to be able to serve and live upto their expectations and occupy unparalleled postion of Flange makers in China.

The types of pipe flange

A pipe flange is disc, collar or ring that attaches to pipe with the purpose of providing increased support for strength, blocking off a pipeline or implementing the attachment of more items. Pipe flanges are usually welded or screwed to the pipe end and are connected with bolts. A gasket is inserted between the two mating flanges to provide a tighter seal. Pipe flanges are either custom with dimensions provided by the customer or they are manufactured according to published specifications. Several organizations and associations have published specifications that provide dimensional information as well as pressure specifications at different temperatures.

Sunny Steel manufactures custom flanges and stocks 6 basic types of pipe flanges. Although, these are the 6 most common types of pipe flanges, Sunny Steel is a custom flange manufacturer as well and is able to create just about any type of flange necessary for your requirements.

SLIP-ON PIPE FLANGES >>

Slip-on pipe flanges actually slip over the pipe. These pipe flanges are typically machined with an inside diameter of the pipe flange slightly larger than the outside diameter of the pipe. This allows the flange to slide over the pipe but to still have a somewhat snug fit. Slip-on pipe flanges are secured to the pipe with a fillet weld at the top and the bottom of the slip-on pipe flanges. These pipe flanges are also further categorized as a ring or a hub. Ring pipe flanges and hub pipe flanges are both considered slip on pipe flanges because they both slip over the pipe. Slip on Pipe flanges with a hub have published specifications that range from 1/2″ thru 96″. Slip on pipe flanges that consist of a flat ring have published specifications that range from 1/2″ to 144″. Sunny Steel provides Slip-On pipe flanges in all material grades, specifications and sizes.

WELD NECK PIPE FLANGES >>

Weld neck pipe flanges attach to the pipe by welding the pipe to the neck of the pipe flange. This allows for the transfer of stress from the weld neck pipe flanges to the pipe itself. This also reduces high stress concentration at the base of the hub of the weld neck pipe flanges. Weld neck pipe flanges are often used for high pressure applications. The inside diameter of a weld neck pipe flange is machined to match the inside diameter of the pipe. Weld Neck Pipe flanges with a hub have published specifications that range from 1/2″ to 96″. Sunny Steel provides Weld Neck pipe flanges in all material grades, specifications and sizes.

BLIND PIPE FLANGES >>

Blind pipe flanges are pipe flanges used to seal the end of a piping system or pressure vessel openings to prevent flow. Blind pipe flanges are commonly used for pressure testing the flow of liquid or gas through a pipe or vessel. Blind pipe flanges also allow easy access to the pipe in the event that work must be done inside the line. Blind pipe flanges are often used for high pressure applications. Slip on Pipe flanges with a hub have published specifications that range from 1/2″ to 96″. Sunny Steel provides Blind pipe flanges in all material grades, specifications and sizes.

LAP JOINT PIPE FLANGES >>

Lap Joint Pipe Flanges slide over the pipe and are most commonly used with Stub End Fittings. A pipe is typically welded to the Stub End and the Lap Joint pipe flange is free to rotate around the stub end. The benefit of this is that there will not be any issues with bolt hole alignment. Lap Joint pipe flanges are often used for applications that require frequent dismantling. Slip on Pipe flanges with a hub have published specifications that range from 1/2″ to 24″. Sizes above 24″ are produced as lap joints to slip on dimensions. Sunny Steel provides Lap Joint pipe flanges in all material grades, specifications and sizes.

THREADED PIPE FLANGES >>

Threaded pipe flanges are similar to slip-on pipe flanges except the bore of threaded pipe flange has tapered threads. Threaded pipe flanges are used with pipes that have external threads. The benefit of these pipe flanges is that it can be attached without welding. Threaded pipe flanges are often used for small diameter, high pressure requirements. Slip on Pipe flanges with a hub have published specifications that range from 1/2″ to 24″. Sunny Steel provides Threaded pipe flanges in all material grades, specifications and sizes.


SOCKET-WELD PIPE FLANGES >>

Socket-weld pipe flanges are typically used on smaller sizes of high pressure pipes. These pipe flanges are attached by inserting the pipe into the socket end and applying fillet weld around the top. This allows for a smooth bore and better flow of the fluid or gas inside of the pipe. Slip on Pipe flanges with a hub have published specifications that range from 1/2″ to 24″. Sunny Steel provides Socket Weld pipe flanges in all material grades, specifications and sizes.

Dimensions of spectacle blinds according to ASME B16.48

Dimensions of spectacle blinds according to  B16.48 for installation between B16.5 flanges.
Material SymbolCMnPSSiNiCrMoCuNVCo
ASTM A1050.350.60-1.050.0350.040.10-0.350.40.30.120.4_0.08_
ASTM A350 LF20.30.60-1.350.0350.040.15-0.300.40.30.120.4_0.080.02
ASTM A182 F3040.0820.0450.0318.0-11.018.0-20.0_____
ASTM A182 F304L0.0320.0450.0318.0-13.018.0-20.0_____
ASTM A182 F3160.0820.0450.03110.0-14.016.0-18.02.00-3.00____
ASTM A182 F316L0.0320.0450.03110.0-15.016.0-18.02.00-3.00____
ASTM A182 F3210.0820.0450.0319.0-12.017.0-19.0_____
EN 10025 S235JR0.21.40.0450.045_____0.01__
20Mn0.17-0.230.70-1.000.0350.0350.17-0.370.30.250.25
200.17-0.230.60-1.000.030.020.17-0.370.250.250.25
16Mn0.13-0.191.20-1.600.030.020.20-0.600.30.30.25
Material SymbolTensile Strength, min, MPaYield point, min, MpaElongation, min, %Reduction of area, min, %Hardness, max, HBMin. ImpactTest Temperature, °C
ASTM A1054852502230187
ASTM A350 LF2485-655250223020-46
ASTM A182 F3045152053050
ASTM A182 F304L4851703050
ASTM A182 F3165152053050
ASTM A182 F316L4851703050
ASTM A182 F3215152053050
20Mn4502752450197
204102452555156

Raised Face Joint Blanks

Raised Face Joint Blanks
Raised Face Joint Blanks
  • ASME B16.48 says: The gasket seating surface finish and dimensions for raised face line blanks shall be in accordance with ASME B16.5. A raised face may be specified at the option of the purchaser.
  • A Raised Face would add machining time and complexity so the price would be higher. Call this the Bugatti or Rolls Royce of the line blind world.
  • Personally, I have seen that version once or twice somewhere. The version without Raised Face is the default and is used everywhere.

Get in touch

Welcome to Sunny Steel Enterprise Ltd.

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.
You can get in touch by telephone, post, online or E-mail.
Please check the help section first to see if your question may be answered there.

Flanges General

Flanges General
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system.

Pipe fitting

Pipe fitting
Pipe fitting is work that involves the installation or repair of pipes or tubes. Pipes and tubes are necessary for a wide range of reasons.

Hot products

86030 alloy steel forgings ANSI B 16.5 Class 150 lb ANSI B 16.5 Class 2500 lb ANSI B 16.5 Class 400 lb ANSI B 16.5 Class 900 lb ANSI B16.5 Class 150 LJ ANSI B16.5 Class 300 LJ API 605 Class 900 WN ASME B16.47 Series A/MSS SP-44 Class 150 WN ASME B16.47 Series A/MSS SP-44 Class 300 WN ASME B16.47 Series A/MSS SP-44 Class 600 WN ASME B16.47 Series A/MSS SP-44 Class 900 WN ASME B16.47 Series B ASME B16.47 Series B / API 605 Class 300 WN ASME B16.47 Series B / API 605 Class 600 WN ASME B16.47 Series B/API 605 Class 150 WN ASME B16.47 Series B/API 605 Class 75 WN ASME B16.48 Class 150 ASME B16.48 Class 1500 ASME B16.48 Class 2500 ASME B16.48 Class 300 ASME B16.48 Class 600 ASME B16.48 Class 900 ASME/ANSI B16.5 & B16.47 ASME/ANSI B16.5 & B16.47-2 ASME/ANSI B16.5 & B16.47-3 ASME/ANSI B16.5 Class 150 BL ASME/ANSI B16.5 Class 150 SO ASME/ANSI B16.5 Class 150 SW ASME/ANSI B16.5 Class 150 TH ASME/ANSI B16.5 Class 150 WN ASME/ANSI B16.5 Class 1500 LJ ASME/ANSI B16.5 Class 1500 SW ASME/ANSI B16.5 Class 1500 WN ASME/ANSI B16.5 Class 2500 LJ ASME/ANSI B16.5 Class 2500 WN ASME/ANSI B16.5 Class 300 LJ ASME/ANSI B16.5 Class 300 SO ASME/ANSI B16.5 Class 300 SW ASME/ANSI B16.5 Class 300 TH ASME/ANSI B16.5 Class 300 WN ASME/ANSI B16.5 Class 600 LJ ASME/ANSI B16.5 Class 600 SO ASME/ANSI B16.5 Class 600 SW ASME/ANSI B16.5 Class 600 TH ASME/ANSI B16.5 Class 600 WN ASME/ANSI B16.5 Class 900 LJ ASME/ANSI B16.5 Class 900 SO ASME/ANSI B16.5 Class 900 TH ASME/ANSI B16.5 Class 900 WN ASTM A350 ASTM A350 LF2 Blind Flange Blind Flanges Blind pipe flanges BS 3293 Class 150 SO BS 3293 Class 150 WN BS 3293 Class 300 SO BS 3293 Class 300 WN BS 3293 Class 600 SO BS 3293 Class 600 WN DIN 26 32 PN10 DIN 2631 PN6 DIN 2633 PN16 DIN 2634 PN25 DIN 2635 PN40 DIN 86029 DIN 86030 DIN2565 PN6 DIN2565 PN6 Threaded Flange DIN2566 PN10 DIN2566 PN10/ DIN2566 PN16 Figure-8 Blanks Flange Flange Material Flange Spreader Flanged Connections Forged Flange Forged steel flanges lap joint flange Lap Joint Flanges Lap Joint Flanges Manufacturers Lap Joint Pipe Flanges Long Weld Neck Flanges NW Long Weld Neck Flanges Orifice Flange Orifice Flanges Pipe flange Pipe flanges PN16 Threaded Flange Reducing flange Reducing Flanges Ring Joint Facings Ring Type Joint Flange RTJ Flanges Slip-on flange Slip-On Flanges Slip-on pipe flange Slip-On Pipe Flanges SO Flange Socket Weld Flange socket welding flange Socket Welding Flanges Socket-weld pipe flanges Spectacle Blind Flange Spectacle Blind Flanges Spectacle Blind Flanges manufactory Spectacle Flanges Stub End Lap Joint Flanges Stub End Lap Joint Flanges Suppliers SW Flange TH Flanges Threaded (Screwed) flange Threaded Flange Threaded Flanges Threaded pipe flanges Weld Neck Flange Weld neck pipe flanges Welding neck flanges WN flange