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

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

• ASME/ANSI B16.5 Class 150 SO
• ASME/ANSI B16.5 Class 300 SO
• ASME/ANSI B16.5 Class 600 SO
• ASME/ANSI B16.5 Class 900 SO
• BS 3293 Class 150 SO
• BS 3293 Class 300 SO
• BS 3293 Class 600 SO
• DIN 86029 PN 10

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

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
Grade	C	Mn	P	S	Si	Ni	Cr	Mo
F304	0.08	2.0	0.045	0.030	1.0	8.0-11.0	18.0-20.0
F304L	0.030	2.0	0.045	0.030	1.0	8.0-13.0	18.0-20.0
F316L	0.030	2.0	0.045	0.030	1.0	10.0-15.0	16.0-18.0	2.0-3.0
Note: Grades F304, F304L, and F316L shall have a maximum Nitrogen content of 0.10%.
Pipes according to ASTM A312
Grade	C	Mn	P	S	Si	Cr	Ni	Mo
TP304	0.08	2.0	0.045	0.030	1.0	18.0-20.0	8.0-11.0
TP304L	0.035	2.0	0.045	0.030	1.0	18.0-20.0	8.0-13.0
TP316L	0.035	2.0	0.045	0.030	1.0	16.0-18.0	10.0-14.0	2.0-3.0
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
Grade	C (1)	Mn (1)	P (1)	S (1)	Si (1)	Ni	Cr	Mo
WP304	0.08	2.0	0.045	0.030	1.0	8.0-11.0	18.0-20.0
WP304L	0.030 (2)	2.0	0.045	0.030	1.0	8.0-12.0	18.0-20.0
WP316L	0.030 (2)	2.0	0.045	0.030	1.0	10.0-14.0 (3)	16.0-18.0	2.0-3.0
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
Material	Pipes	Fittings	Flanges	Valves	Bolts & Nuts
Carbon Steel	A106 Gr A	A234 Gr WPA	A105	A216 Gr WCB	A193 Gr B7 A194 Gr 2H
	A106 Gr B	A234 Gr WPB	A105	A216 Gr WCB
	A106 Gr C	A234 Gr WPC	A105	A216 Gr WCB
Carbon Steel Alloy High-Temp	A335 Gr P1	A234 Gr WP1	A182 Gr F1	A217 Gr WC1	A193 Gr B7 A194 Gr 2H
	A335 Gr P11	A234 Gr WP11	A182 Gr F11	A217 Gr WC6
	A335 Gr P12	A234 Gr WP12	A182 Gr F12	A217 Gr WC6
	A335 Gr P22	A234 Gr WP22	A182 Gr F22	A217 Gr WC9
	A335 Gr P5	A234 Gr WP5	A182 Gr F5	A217 Gr C5
	A335 Gr P9	A234 Gr WP9	A182 Gr F9	A217 Gr C12
Carbon Steel Alloy Low-Temp	A333 Gr 6	A420 Gr WPL6	A350 Gr LF2	A352 Gr LCB	A320 Gr L7 A194 Gr 7
	A333 Gr 3	A420 Gr WPL3	A350 Gr LF3	A352 Gr LC3
Austenitic Stainless Steel	A312 Gr TP304	A403 Gr WP304	A182 Gr F304	A182 Gr F304	A193 Gr B8 A194 Gr 8
	A312 Gr TP316	A403 Gr WP316	A182 Gr F316	A182 Gr F316
	A312 Gr TP321	A403 Gr WP321	A182 Gr F321	A182 Gr F321
	A312 Gr TP347	A403 Gr WP347	A182 Gr F347	A182 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

The packing way of iron & steel cage

Tensile-membrane

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.