Class 150 Slip On Flange Order

In late January 2025, we received an order for Class 150 Slip on flange from a long-time customer in Shanghai. This customer has placed many orders with our company because our sales staff’s professional capabilities and efficiency have established a good long-term cooperative relationship with the customer.

Information of Order：

•Product：Slip On Flanges

•Material Standard: ASTM A182 F904L Stainless steel

•Size : DN25

•Pressure:Class 150

•Production Standard: ASME B16.5

What Is a Slip On Flange?

A slip on flange is a common type of pipe connection component that is fixed to the end of a pipe by welding. It is typically used in low-pressure or non-critical piping systems. It has a circular disc shape with a hole in the center that matches the inner diameter of the pipe, and bolt holes around the edge for sealing when mated with another flange. Installation involves simply inserting the pipe into the flange hole and performing a fillet weld, making the process relatively simple and cost-effective. It is commonly used in water treatment, HVAC, or general industrial piping systems.

Dimension of Class 150 Slip On Flange：

Nominal Pipe Size		A	B	C	D	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.3	88.9	22.4	11.2	15.7	30.2	35.1	4	15.7	60.45	0.39
3/4	26.7	98.6	27.7	12.7	15.7	38. 10	42.9	4	15.7	69.85	0.56
1	33.4	108	34.5	14.2	17.5	49.3	50.8	4	15.7	79.25	0.78
11/4	42.2	117.3	43.2	15.7	20.6	58.7	63.5	4	15.7	88.9	1.03
11/2	48.3	127	49.5	17.5	22.4	65	73.15	4	15.7	98.6	1.32
2	60.3	152.4	62	19.1	25.4	77.7	91.9	4	19.1	120.7	2.06
21/2	73	177.8	74.7	22.4	28.4	90.4	104.6	4	19.1	139.7	3.28
3	88.9	190.5	90.7	23.9	30.2	108	127	4	19.1	152.4	3.85
31/2	101.6	215.9	103.4	23.9	31.75	122.2	139.7	8	19.1	177.8	4.81
4	114.3	228.6	116.1	23.9	33.3	134.9	157.2	8	19.1	190.5	5.30
5	141.3	254	143.8	23.9	36.6	163.6	185.7	8	22.4	215.9	6.07
6	168.3	279.4	170.7	25.4	39.6	192	215.9	8	22.4	241.3	7.45
8	219.1	342.9	221.5	28.4	44.5	246.1	269.7	8	22.4	298.5	12.1
10	273	406.4	276.3	30.2	49.3	304.8	323.9	12	25.4	362	16.5
12	323.8	482.6	327.1	31.75	55.6	365.3	381	12	25.4	431.8	26.2
14	355.6	533.4	359.1	35.1	57.15	400.1	412.8	12	28.4	476.3	34.6
16	406.4	596.9	410.5	36.6	63.5	457.2	469.9	16	28.4	539.8	44.8
18	457.2	635	461.8	39.6	68.3	505	533.4	16	31.75	577.9	48.9
20	508	698.5	513.1	42.9	73.15	558.8	584.2	20	31.75	635	61.9
24	609.6	812.8	616	47.8	82.6	663.4	692.2	20	35.1	749.3	86.9

ASME B16.5 Slip On flanges are available in a range of pressure classes, including 150, 300, 400, 600, 900, and 1500 pounds. For a complete list of specifications and other product parameters, please follow the link below.

• ASME B16.5 Class 300 Slip On Flange Dimension
• ASME B16.5 Class 400 Slip On Flange Dimension
• ASME B16.5 Class 600 Slip On Flange Dimension
• ASME B16.5 Class 900 Slip On Flange Dimension
• ASME B16.5 Class 1500 Slip On Flange Dimension

ASTM A182 F304L Material：

ASTM A182 F304L is a widely used austenitic stainless steel, known as the low-carbon version of 304. It offers dependable corrosion resistance and outstanding weldability, making it suitable for pressure vessels, piping systems, and flange connections operating under high temperatures.

Chemical Composition：

ASTM A182 F304L is built on an iron-chromium-nickel base, featuring 18-20% chromium for corrosion resistance and 8-13% nickel for structural stability. Its key characteristic is the ultra-low carbon content (0.03% max), which prevents chromium depletion during welding. Small amounts of manganese and silicon aid in processing, while impurities like phosphorus and sulfur are kept to minimal levels.

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F304L	MIN						8.00	18.00
	MAX	0.03	2.00	0.045	0.030	1.00	13.00	20.00		0.10

Mechanical Properties：

This material has moderate strength, with a minimum yield strength of 170 MPa and a minimum tensile strength of 485 MPa. Its outstanding features are its excellent ductility (more than 30% elongation) and its exceptional toughness, which is maintained even in low-temperature environments.

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %
ASTM A182 F304L	485 min	170 min	30 min	50 min

Class 150 Slip On Flange Inspection：

✅Inspect the sealing face for scratches or dents that might affect sealing performance.

✅Verify all bolt holes are evenly spaced and properly aligned.

✅Check the welding area for cracks or incomplete fusion.

✅Measure the flange thickness to ensure it meets specified standards.

✅Confirm the outer diameter matches the required dimensions.

✅Look for any visible corrosion or coating damage on the surface.

Common Applications:

• Water treatment systems
• Heating, ventilation, and air conditioning (HVAC)
• General industrial piping
• Low-pressure petrochemical piping
• Fire sprinkler systems
• Irrigation systems