MSS SP44 Flanges

Understanding your choice of MSS SP44 flanges options

MSS SP44 flanges are typically used in high-pressure piping systems, particularly in the oil and gas industry. They are designed to meet specific standards and can handle a range of pressures and temperatures. There are different options available for MSS SP44 flanges, including the material of construction (such as carbon steel, stainless steel, or alloy), the type of facing (such as raised face or flat face), the size and pressure class, and the connection type (such as butt-weld or threaded). The choice of MSS SP44 flange options will depend on the specific requirements of the piping system, including the fluid being transported, the pressure and temperature conditions, and the compatibility with other components in the system. It is important to consult with industry standards and experienced professionals to ensure that the correct flange options are selected for a particular application.

What are MSS SP44 flanges?

MSS SP44 is a standard developed by the Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry. It covers steel pipeline flanges, including MSS SP44 flanges, which are designed for use in high-pressure and high-temperature applications. These flanges are commonly used in the oil and gas industry and other industries where heavy-duty piping systems are required. They are available in a range of sizes and pressure ratings and are designed to withstand harsh environmental conditions and high stress.

ASME B16.47 VS MSS SP-44?

MSS SP-44 and ASME B16.47 are both standards related to flanges, but they have some key differences:

1. ASME B16.47 Series A flanges (≥NPS 26) are MMS SP-44 flanges. MSS SP-44 also covers NPS 12 to NPS 24 flanges which are equivalent to ASME B16.5. MSS SP-44 is the only source for the NPS 22 flange dimensions above.
2. MSS SP-44 has only one pressure-temperature rating table, whereas ASME B16.47 has two separate tables for Series A and Series B flanges.
3. ASME B16.47 has more rigorous requirements for testing and inspection of flanges, and also includes provisions for flange facings, bolting, gaskets, and other components that may be used with the flanges.

What are the different types of MSS SP44 flanges?

Flanges come in many different types and styles, but some common types of MSS SP44 flanges include:

Types of MSS SP44 flanges

MSS SP44 flanges are used in various applications in different industries, including chemical processing, petrochemicals, power generation, and more. These flanges are designed to provide a secure connection between pipes, valves, or equipment. MSS SP44 is a standard for steel pipeline flanges, and it specifies the types and dimensions of the flanges that are commonly used. 

Welding Neck Flange (WN)

Welding Neck Flanges are the most commonly used type of flange. These flanges are designed to be welded to the pipe or fitting. The neck of the flange is tapered and extends beyond the pipe, which helps to reduce stress concentrations. Welding Neck Flanges are suitable for high-pressure applications and are used in piping systems that require frequent disassembly.

Blind Flange (BL)

Blind Flanges are used to seal the end of a pipe or fitting. These flanges are commonly used in systems where the pipe or equipment needs to be isolated for maintenance or inspection purposes. Blind Flanges are available in various sizes and materials to suit different applications. MSS SP44 flanges are available in various types and sizes to suit different applications. Each type of flange has its own advantages and disadvantages, and it is essential to select the right type of flange for your application. By understanding the different types of MSS SP44 flanges, you can make an informed decision when selecting a flange for your piping system.

Advantages and disadvantages of MSS SP44 flanges

MSS SP44 flanges, also known as steel pipeline flanges, have the following advantages:

Advantages:

• High pressure and temperature rating: MSS SP44 flanges can withstand high pressures and temperatures, making them suitable for use in high-pressure applications.
• Corrosion resistance: They are resistant to corrosion and can withstand harsh environments and exposure to various chemicals.
• Easy to install: They are easy to install and can be used to connect different types of pipelines.
• Versatile: They are available in various sizes, shapes, and materials, making them versatile and suitable for a wide range of applications.

However, they also have the following disadvantages:

Disadvantages:

• High cost: MSS SP44 flanges are relatively expensive compared to other types of flanges.
• Limited availability: They may not be readily available in all regions or countries, which can cause delays in procurement and installation.
• Heavy weight: They are heavy, which can make them difficult to handle and install, especially in large sizes.
• Prone to leakage: If not installed properly, they can be prone to leakage and can cause safety hazards.

Flange Face Finish

Flange face finish is a crucial factor in ensuring proper sealing between flange connections. There are several types of flange face finishes available, each with its unique characteristics and benefits.

Types of Flange Face Finish

One type of flange face finish is the serrated finish. This finish is created by machining a series of grooves into the flange face, providing better grip and improved sealing when compressed. Serrated finishes are commonly used in applications where the flange connection may be subject to vibration or movement. Another type of flange face finish is the stock finish. This is the default finish provided by the manufacturer, and it typically has a smooth surface. While it may not offer the same grip as a serrated finish, a stock finish is suitable for many standard applications.  Spiral serrated finishes feature a spiral pattern of grooves that helps to distribute stress evenly across the flange face. This can help to prevent damage and distortion, which can lead to leaks or other issues.

Concentric serrated finishes are similar to spiral serrated finishes but feature a series of concentric rings around the flange face. This pattern can provide enhanced sealing and grip compared to other types of serrated finishes.

Finally, a smooth finish is another option for flange face finish. Smooth finishes are often used in applications where the flange connection is not subject to significant movement or vibration. While it may not offer the same grip as a serrated finish, a smooth finish can still provide a reliable seal in many standard applications.

For example:

Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 – 6.3 micrometer (= 125 – 250 microinches AARH)

• AARH stands for Arithmetic Average Roughness Height. It is used to measure the roughness (rather smoothness) of surfaces. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface.
• 63 AARH is specified for Ring Type Joints.
• 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets.
• 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. If we use smooth finish for soft gaskets enough “biting effect” will not occur and hence the joint may develop leak.
• Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same.

Selecting the appropriate flange face finish is essential to ensuring a proper seal between flange connections. Whether you choose a serrated finish, stock finish, spiral serrated, concentric serrated, or smooth finish, it is important to consider the specific application and potential stresses that the flange connection may face. By selecting the right finish for the job, you can help to prevent leaks and other issues that can lead to costly downtime and repairs.

Standard Specication For MSS SP44 Flanges

• Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
• Size : 1/2″ (15 NB) to 48″ (1200NB)
• Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
• DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629,
• DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673
• BS : BS4504 , BS4504, BS1560, BS10
• Flange Face Type : Flate Face (FF), Raised Face(RF), Ring Type Joint (RTJ)

Material of MSS SP44 Flanges

MSS SP44 Flanges are typically made from a variety of materials, depending on the specific application and desired property. some common materials for MSS SP44 Flanges include steel, stainless steel, cast iron, brass, and aluminum. Material selection is typically based on factors such as temperature, pressure, corrosiveness of the fluid or gas being conveyed, and any regulatory requirements or industry standards that may apply. Some common materials used for MSS SP44 flanges include:  

Stainless Steel MSS SP44 Flange	ASTM/ASME A/SA182:- F304, F304L, F316, F316L, ASTM/ASME A/SA351:- CF3, CF3M, CF8, CF8M, DIN 1.4306, DIN 1.4301, DIN 1.4404, DIN 1.4401, DIN 1.4408, DIN 1.4308, DIN 1.4306, DIN 1.4409
Duplex MSS SP44 Flange	S31803 / S32205 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex MSS SP44 Flange	S32750 / S32760 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Copper Nickel MSS SP44 Flange	ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Titanium MSS SP44 Flange	ASTM B381 / ASME SB381:- Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7, ASTM R50250/GR.1|R50400/GR.2|R50550/GR.3|R50700/GR.4|GR.6|R52400/GR.7| R53400/GR.12|R56320/GR.9| R56400/GR.5
Copper MSS SP44 Flange	TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000, C12200, C12300, T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910, C10920, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Incoloy MSS SP44 Flange	ASTM B564 / ASME SB564:- Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
Inconel MSS SP44 Flange	ASTM B564 / ASME SB564:- Inconel 600, 601, 625, 718, 783, 690, x750
Nickel MSS SP44 Flange	ASTM B564 / ASME SB564:- Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Hastelloy MSS SP44 Flange	ASTM B564 / ASME SB564:- Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel MSS SP44 Flange	ASTM B564 / ASME SB564:- Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Carbon Steel MSS SP44 Flange	ASTM/ASME A/SA105 A/SA105N and A/SA216-WCB, DIN 1.0460, DIN 1.0402, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, CS High Yield ASTM A694 / A694 (F52, F56, F60, F65, F70, F80)
Alloy Steel MSS SP44 Flange	ASTM A182 / ASME SA182:- F5, F9, F11, F12, F22, F91
Alloy 20 MSS SP44 Flange	ASTM B462 / ASME SB462:- Carpenter 20 Alloy, Alloy 20Cb-3
254 SMO MSS SP44 Flange	ASTM A182 / ASME SA182:- SMO 254/6Mo, UNS S31254, DIN 1.4547
Aluminium MSS SP44 Flange	5052 /6061/ 6063 / 2017 / 7075 / etc.
Brass MSS SP44 Flange	3602 / 2604 / H59 / H62 / etc.
Other MSS SP44 Flange material	Tin bronze, Alumunum bronze, Lead bronze, Nimonic 75, Nimonic 80A, Nimonic 90, AISI 4140, AISI 4130, Mild Steel, Al6XN

Size of MSS SP44 Flanges

MSS SP44 flanges are typically available in sizes ranging from 22″ to 48″ in diameter. However, the exact size availability may vary depending on the manufacturer and the specific requirements of the application.

Dimensions of MSS SP44 Flanges

MSS SP44 flanges are available in various dimensions and pressure ratings. The flange dimensions are typically specified by the nominal pipe size (NPS), flange facing type, and pressure class. Common NPS sizes for MSS SP44 flanges range from 22″ to 60″, and pressure classes range from 150 to 900. The facing types can be flat face, raised face, or RTJ (ring type joint). The dimensions and tolerances for MSS SP44 flanges are specified in the standard.

ANSI/ASME B16.47 Flange Series A / MSS SP44 Flange Dimensions (class150lb-900lb)

PDF: ANSI/ASME B16.47 Flange Series A / MSS SP44 Flange Dimensions (class150lb-900lb)

ANSI/ASME B16.47 Flange Series A / MSS SP44 Flange Dimensions Class 150Lbs

Class 150lbs

Pipe		Flange Data			Hub Data		Raised Face	Drilling Data			Radius
Nominal Pipe Size
	Overall Diameter	WNF FlangeThickness min	Blind FlangeThickness min	Overall LengthWNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	in	in	in	in	in	in	in		in	in	in
	mm	mm	mm	mm	mm	mm	mm		mm	mm	mm
22	29.50 749.30	1.81 45.97	1.81 45.97	5.88 149.35	22.00 558.80	24.00 609.60	25.25 641.35	20	1.38 35.05	27.25 692.15	0.38 9.65
26	34.25 869.95	2.69 68.33	2.69 68.33	4.75 120.65	26.00 660.40	26.62 676.15	29.50 749.30	24	1.38 35.05	31.75 806.45	0.38 9.65
28	36.50 927.10	2.81 71.37	2.81 71.37	4.94 125.48	28.00 711.20	28.62 726.95	31.50 800.10	28	1.38 35.05	34.00 863.60	0.44 11.18
30	38.75 984.25	2.94 74.68	2.94 74.68	5.38 136.65	30.00 762.00	30.75 781.05	33.75 857.25	28	1.38 35.05	36.00 914.40	0.44 11.18
32	41.75 1060.5	3.19 81.03	3.19 81.03	5.69 144.53	32.00 812.80	32.75 831.85	36.00 914.40	28	1.62 41.15	38.50 977.90	0.44 11.18
34	43.75 1111.3	3.25 82.55	3.25 82.55	5.88 149.35	34.00 863.60	34.75 882.65	38.00 965.20	32	1.62 41.15	40.50 1028.7	0.50 12.70
36	46.00 1168.4	3.56 90.42	3.56 90.42	6.19 157.23	36.00 914.40	36.75 933.45	40.25 1022.4	32	1.62 41.15	42.75 1085.9	0.50 12.70
38	48.75 1238.3	3.44 87.38	3.44 87.38	6.19 157.23	38.00 965.20	39.00 990.60	42.25 1073.2	32	1.62 41.15	45.25 1149.4	0.50 12.70
40	50.75 1289.1	3.56 90.42	3.56 90.42	6.44 163.58	40.00 1016.0	41.00 1041.4	44.25 1124.0	36	1.62 41.15	47.25 1200.2	0.50 12.70
42	53.00 1346.2	3.81 96.77	3.81 96.77	6.75 171.45	42.00 1066.8	43.00 1092.2	47.00 1193.8	36	1.62 41.15	49.50 1257.3	0.50 12.70
44	55.25 1403.4	4.00 101.60	4.00 101.60	7.00 177.80	44.00 1117.6	45.00 1143.0	49.00 1244.6	40	1.62 41.15	51.75 1314.5	0.50 12.70
46	57.25 1454.2	4.06 103.12	4.06 103.12	7.31 185.67	46.00 1168.4	47.12 1196.9	51.00 1295.4	40	1.62 41.15	53.75 1365.3	0.50 12.70
48	59.50 1511.3	4.25 107.95	4.25 107.95	7.56 192.02	48.00 1219.2	49.12 1247.7	53.50 1358.9	44	1.62 41.15	56.00 1422.4	0.50 12.70

Notes:

• ASME B16.47 Series A flanges (≥ NPS 26) are MMS SP-44 flanges. MSS SP-44 also covers NPS 12 to NPS 24 flanges which are equivalent to ASME B16.5. MSS SP-44 is the only source for the NPS 22 flange dimensions above. -Dimension B is to be specified by the purchaser. It corresponds to the pipe inside diameter.

• Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard). -WNF = Weld Neck Flange. The large end of the hub may be straight or tapered.

ANSI/ASME B16.47 Flange Series A / MSS SP44 Flange Dimensions Class 300Lbs

Class 300 lbs

Pipe		Flange Data			Hub Data		Raised Face	Drilling Data			Radius
Nominal Pipe Size
	Overall Diameter	WNF FlangeThickness min	Blind FlangeThickness min	Overall LengthWNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	in	in	in	in	in	in	in		in	in	in
	mm	mm	mm	mm	mm	mm	mm		mm	mm	mm
22	33.00 838.20	2.62 66.55	2.62 66.55	6.50 165.10	22.00 558.80	25.25 641.35	25.25 641.35	24	1.62 41.15	29.25 742.95	0.38 9.65
26	38.25 971.55	3.12 79.25	3.31 84.07	7.25 184.15	26.00 660.40	28.38 720.85	29.50 749.30	28	1.75 44.45	34.50 876.30	0.38 9.65
28	40.75 1035.1	3.38 85.85	3.56 90.42	7.75 196.85	28.00 711.20	30.50 774.70	31.50 800.10	28	1.75 44.45	37.00 939.80	0.44 11.18
30	43.00 1092.2	3.62 91.95	3.75 95.25	8.25 209.55	30.00 762.00	32.56 827.02	33.75 857.25	28	1.88 47.75	39.25 996.95	0.44 11.18
32	45.25 1149.4	3.88 98.55	3.94 100.08	8.75 222.25	32.00 812.80	34.69 881.13	36.00 914.40	28	2.00 50.80	41.50 1054.1	0.44 11.18
34	47.50 120.50	4.00 101.60	4.12 104.65	9.12 231.65	34.00 863.60	36.88 936.75	38.00 965.20	28	2.00 50.80	43.50 1104.9	0.50 12.70
36	50.00 1270.0	4.12 104.65	4.38 111.25	9.50 241.30	36.00 914.40	39.00 990.60	40.25 1022.4	32	2.12 53.85	46.00 1168.4	0.50 12.70
38	46.00 1168.4	4.25 107.95	4.25 107.95	7.12 180.85	38.00 965.20	39.12 993.65	40.50 1028.7	32	1.62 41.15	43.00 1092.2	0.50 12.70
40	48.75 1238.3	4.50 114.30	4.50 114.30	7.62 193.55	40.00 1016.0	41.25 1047.8	42.75 1085.9	32	1.75 44.45	45.50 1155.7	0.50 12.70
42	50.75 1289.1	4.69 119.13	4.69 119.13	7.88 200.15	42.00 1066.8	43.25 1098.6	44.75 1136.7	32	1.75 44.45	47.50 1206.6	0.50 12.70
44	53.25 1352.6	4.88 123.95	4.88 123.95	8.12 206.25	44.00 1117.6	45.25 1149.4	47.00 1193.8	32	1.88 47.75	49.75 1263.7	0.50 12.70
46	55.75 1416.1	5.06 128.52	5.06 128.52	8.50 215.90	46.00 1168.4	47.38 1203.5	49.00 1244.0	28	2.00 50.80	52.00 1320.8	0.50 12.70
48	57.75 1466.9	5.25 133.35	5.25 133.35	8.81 223.77	48.00 1219.2	49.38 1254.3	51.25 1301.8	32	2.00 50.80	54.00 1371.6	0.50 12.70

Notes:

• ASME B16.47 Series A flanges (≥ NPS 26) are MMS SP-44 flanges. MSS SP-44 also covers NPS 12 to NPS 24 flanges which are equivalent to ASME B16.5. MSS SP-44 is the only source for the NPS 22 flange dimensions above. -Dimension B is to be specified by the purchaser. It corresponds to the pipe inside diameter.
• Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard). -WNF = Weld Neck Flange. -The large end of the hub may be straight or tapered.

ANSI/ASME B16.47 Flange Series A / MSS SP44 Flange Dimensions Class 400Lbs

 

Class 400 lbs

Pipe		Flange Data			Hub Data		Raised Face	Drilling Data			Radius
Nominal Pipe Size
	Overall Diameter	WNF FlangeThickness min	Blind FlangeThickness min	Overall LengthWNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	in	in	in	in	in	in	in		in	in	in
	mm	mm	mm	mm	mm	mm	mm		mm	mm	mm
22	33.00 838.20	2.88 73.15	2.88 73.15	6.75 171.45	22.00 558.80	25.25 641.35	25.25 641.35	24	1.75 44.45	29.25 742.95	0.44 11.18
26	38.25 971.55	3.50 88.90	3.88 98.55	7.62 193.55	26.00 660.40	28.62 726.95	29.50 749.30	28	1.88 47.75	34.50 876.30	0.44 11.18
28	40.75 1035.1	3.75 95.25	4.12 104.65	8.12 206.25	28.00 711.20	30.81 782.57	31.50 800.10	28	2.00 50.80	37.00 939.80	0.50 12.70
30	43.00 1092.2	4.00 101.60	4.38 111.25	8.62 218.95	30.00 762.00	32.94 836.68	33.75 857.25	28	2.12 53.85	39.25 996.95	0.50 12.70
32	45.25 1149.4	4.25 107.95	4.56 115.82	9.12 231.65	32.00 812.80	35.00 889.00	36.00 914.40	28	2.12 53.85	41.50 1054.1	0.50 12.70
34	47.50 1206.5	4.38 111.25	4.81 122.17	9.50 241.30	34.00 863.60	37.19 944.63	38.00 965.20	28	2.12 53.85	43.50 1104.9	0.56 14.22
36	50.00 1270.0	4.50 114.30	5.06 128.52	9.88 250.95	36.00 914.40	39.38 1000.3	40.25 1022.4	32	2.12 53.85	46.00 1168.4	0.56 14.22
38	47.50 1206.5	4.88 123.95	4.88 123.95	8.12 206.25	48.00 1219.2	39.50 1003.3	40.75 1035.1	32	1.88 47.75	44.00 1117.6	0.56 14.22
40	50.00 1270.0	5.12 130.05	5.12 130.05	8.50 215.90	40.00 1016.0	41.50 1054.1	43.00 1092.2	32	2.00 50.80	46.25 1174.8	0.56 14.22
42	52.00 1320.8	5.25 133.35	5.25 133.35	8.81 223.77	42.00 1066.8	43.62 1107.9	45.00 1143.0	32	2.00 50.80	48.25 1225.6	0.56 14.22
44	54.50 1384.3	5.50 139.70	5.50 139.70	9.18 233.17	44.00 1117.6	45.62 1158.7	47.25 1200.2	32	2.12 53.85	50.50 1282.7	0.56 14.22
46	56.75 1441.5	5.75 146.05	5.75 146.05	9.62 244.35	46.00 1168.4	47.75 1212.9	49.50 1257.3	36	2.12 53.85	52.75 1339.9	0.56 14.22
48	59.50 1511.3	6.00 152.40	6.00 152.40	10.12 257.05	48.00 1219.2	49.88 1267.0	51.50 1308.1	28	2.38 60.45	55.25 1403.4	0.56 14.22

Notes:

• ASME B16.47 Series A flanges (≥ NPS 26) are MMS SP-44 flanges. MSS SP-44 also covers NPS 12 to NPS 24 flanges which are equivalent to ASME B16.5. MSS SP-44 is the only source for the NPS 22 flange dimensions above.

• Class 400 Series A dimensions at NPS 38 and larger also apply to Class 400 Series B flanges.

• Dimension B is to be specified by the purchaser. It corresponds to the pipe inside diameter.

• Flat face flanges may be provided at full thickness, C + raised face, or with raised face removed (the latter is nonstandard).

• WNF = Weld Neck Flange.

• The large end of the hub may be straight or tapered.

ANSI/ASME B16.47 Flange Series A / MSS SP44 Flange Dimensions Class 600Lbs

Class 600 lbs

Pipe		Flange Data			Hub Data		Raised Face	Drilling Data			Radius
Nominal Pipe Size
	Overall Diameter	WNF FlangeThickness min	Blind FlangeThickness min	Overall LengthWNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	in	in	in	in	in	in	in		in	in	in
	mm	mm	mm	mm	mm	mm	mm		mm	mm	mm
22	34.25 869.95	3.75 95.25	3.75 95.25	7.75 196.85	22.00 558.80	26.25 666.75	25.25 641.35	24	1.88 47.75	30.62 777.75	0.44 11.18
26	40.00 1016.0	4.25 107.95	4.94 125.48	8.75 222.25	26.00 660.40	29.44 747.78	29.50 749.30	28	2.00 50.80	36.00 914.40	0.50 12.70
28	42.25 1073.2	4.38 111.25	5.19 131.83	9.25 234.95	28.00 711.20	31.62 803.15	31.50 800.10	28	2.12 53.85	38.00 965.20	0.50 12.70
30	44.50 1130.3	4.50 114.30	5.50 139.70	9.75 247.65	30.00 762.00	33.94 862.08	33.75 857.25	28	2.12 53.85	40.25 1022.4	0.50 12.70
32	47.00 1193.8	4.62 117.35	5.81 147.57	10.25 260.35	32.00 812.80	36.12 917.45	36.00 914.40	28	2.38 60.45	42.50 1079.5	0.50 12.70
34	49.00 1244.6	4.75 120.65	6.06 153.92	10.62 269.75	34.00 863.60	38.31 973.07	38.00 965.20	28	2.38 60.45	44.50 1130.3	0.56 14.22
36	51.75 1314.5	4.88 123.95	6.38 162.05	11.12 282.45	36.00 914.40	40.62 1031.75	40.25 1022.35	28	2.62 66.55	47.00 1193.0	0.56 14.22
38	50.00 1270.0	6.00 152.40	6.12 155.45	10.00 254.00	38.00 965.20	40.25 1022.35	41.50 1054.10	28	2.38 60.45	45.75 1162.1	0.56 14.22
40	52.00 1320.8	6.25 158.75	6.38 162.05	10.38 263.65	40.00 1016.0	42.25 1073.2	43.75 1111.3	32	2.38 60.45	47.75 1212.9	0.56 14.22
42	55.25 1403.4	6.62 168.15	6.75 171.45	11.00 279.40	42.00 1066.8	44.38 1127.3	46.00 1168.4	28	2.62 66.55	50.50 1282.7	0.56 14.22
44	57.25 1454.2	6.81 172.97	7.00 177.80	11.38 289.05	44.00 1117.6	46.50 1181.1	48.25 1225.6	32	2.62 66.55	52.50 1333.5	0.56 14.22
46	59.50 1511.3	7.06 179.32	7.31 185.67	11.81 299.97	46.00 1168.4	48.62 1235.0	50.25 1276.4	32	2.62 66.55	54.75 1390.7	0.56 14.22
48	62.75 1593.9	7.44 188.98	7.69 195.33	12.44 315.98	48.00 1219.2	50.75 1289.1	52.50 1333.5	32	2.88 73.15	57.50 1460.5	0.56 14.22

Notes:

• ASME B16.47 Series A flanges (≥ NPS 26) are MMS SP-44 flanges. MSS SP-44 also covers NPS 12 to NPS 24 flanges which are equivalent to ASME B16.5. MSS SP-44 is the only source for the NPS 22 flange dimensions above.

• Class 600 Series A dimensions at NPS 38 and larger also apply to Class 600 Series B flanges.

• Dimension B is to be specified by the purchaser. It corresponds to the pipe inside diameter.

• Flat face flanges may be provided at full thickness, C + raised face, or with raised face removed (the latter is nonstandard).

• WNF = Weld Neck Flange.

• The large end of the hub may be straight or tapered.

ANSI/ASME B16.47 Flange Series A / MSS SP44 Flange Dimensions Class 900Lbs

Class 900 lbs

Pipe		Flange Data			Hub Data		Raised Face	Drilling Data			Radius
Nominal Pipe Size
	Overall Diameter	WNF FlangeThickness min	Blind FlangeThickness min	Overall LengthWNF	Diameter at Weld Bevel	Hub Diameter	Face Diameter	Number of Holes	Bolt Hole Diameter	Diameter of Circle of Holes	Fillet
	in	in	in	in	in	in	in		in	in	in
	mm	mm	mm	mm	mm	mm	mm		mm	mm	mm
26	42.75 1085.9	5.50 139.70	6.31 160.27	11.25 285.75	26.00 660.40	30.50 774.70	29.50 749.30	20	2.88 73.15	37.50 952.50	0.44 11.18
28	46.00 1168.4	5.62 142.75	6.75 171.45	11.75 298.45	28.00 711.20	32.75 831.85	31.50 800.10	20	3.12 79.25	40.25 1022.4	0.50 12.70
30	48.50 1231.9	5.88 149.35	7.18 182.37	12.25 311.15	30.00 762.00	35.00 889.00	33.75 857.25	20	3.12 79.25	42.75 1085.9	0.50 12.70
32	51.75 1314.5	6.25 158.75	7.62 193.55	13.00 330.20	32.00 812.80	37.25 946.15	36.00 914.40	20	3.38 85.85	45.50 1155.7	0.50 12.70
34	55.00 1397.0	6.50 165.10	8.06 204.72	13.75 349.25	34.00 863.60	39.62 1006.4	38.00 965.20	20	3.62 91.95	48.25 1225.6	0.56 14.22
36	57.50 1460.5	6.75 171.45	8.44 214.38	14.25 361.95	36.00 914.40	41.88 1063.8	40.25 1022.4	20	3.62 91.95	50.75 1289.1	0.56 14.22
38	57.50 1460.5	7.50 190.50	8.50 215.90	13.88 352.55	38.00 965.20	42.25 1073.2	43.25 1098.6	20	3.62 91.95	50.75 1289.1	0.75 19.05
40	59.50 1511.3	7.75 196.85	8.81 223.77	14.31 363.47	40.00 1016.0	44.38 1127.3	45.75 1162.1	24	3.62 91.95	52.75 1339.9	0.81 20.57
42	61.50 1562.1	8.12 206.25	9.12 231.65	14.62 371.35	42.00 1066.8	46.31 1176.3	47.75 1212.9	24	3.62 91.95	54.75 1390.7	0.81 20.57
44	64.88 1648.0	8.44 214.38	9.56 242.82	15.38 390.65	44.00 1117.6	48.62 1235.0	50.00 1270.0	24	3.88 98.55	57.62 1463.6	0.88 22.35
46	68.25 1733.6	8.88 225.55	10.06 255.52	16.18 410.97	46.00 1168.4	50.88 1292.4	52.50 1333.5	24	4.12 104.65	60.50 1536.7	0.88 22.35
48	70.25 1784.4	9.19 233.43	10.38 263.65	16.50 419.10	48.00 1219.2	52.88 1343.2	54.50 1384.3	24	4.12 104.65	62.50 1587.5	0.94 23.88

Notes:

• ASME B16.47 Series A flanges (≥ NPS 26) are MMS SP-44 flanges. MSS SP-44 also covers NPS 12 to NPS 24 flanges which are equivalent to ASME B16.5. MSS SP-44 is the only source for the NPS 22 flange dimensions above.

• Class 900 Series A dimensions at NPS 38 and larger also apply to Class 900 Series B flanges.

• Dimension B is to be specified by the purchaser. It corresponds to the pipe inside diameter.

• Flat face flanges may be provided at full thickness, C + raised face, or with raised face removed (the latter is nonstandard).

• WNF = Weld Neck Flange.

• The large end of the hub may be straight or tapered.

Manufacturing process of MSS SP44 flange

  MSS SP44 flanges can be produced by forging, casting, cutting or rolling. We mainly produce flanges by forging, cutting and rolling processes.  

Manufacturing process of MSS SP44 forged flange

  The welding neck type flanges shall be forged steel, and the blind flanges may be made from either forged steel or from steel plate.  

• Raw material inspection – The key raw material used to produce flanges is billet or hot rolled bar stock. All raw materials purchased are supplied with test reports in accordance with British Standards with full traceability. This is the first mandatory step in the flange production process to ensure good quality. The raw materials are retested in-house to ensure chemical composition, mechanical properties and metallographic analysis.
• Cutting of raw materials – Correct and strict control of cutting sizes and proportions ensures full cost control.
• Heating – This is a very important step for the quality of the flanges. It is necessary to keep detailed records of heating temperatures to avoid overheating. Overheating can damage the structure of the metal and the mechanical properties of the raw material.
• Forging – The forging process is divided into free forging and die forging. The forging time and strength of flanges vary for different pressure classes.
• Heat treatment-The purpose of heat treatment is to eliminate the stress inside the flange and make the density more uniform. Careful recording of heat treatment temperature and cooling time is the key.
• Inspection of forging blanks – After the heat treatment process, select batch samples are tested again for chemical composition and mechanical properties to ensure that all items pass.
• Machining of forging blanks – During machining, inspection is performed along with machining to ensure that each part of the flange is qualified. Machining is performed on CNC and/or lathes.
• Finished Product Inspection – The finished product will be inspected 100% prior to delivery to ensure that the goods meet MSS SP44, ASME, EN or customer standards.
• Documented Documentation – The entire production process and quality checks at different levels are documented according to MSS SP44 compliant standard operating procedures. This is the guarantee of good quality.
• Test certificates: As we are an MSS SP44 and PED certified manufacturer, we can issue test certificates for all goods upon delivery and inspection in accordance with British Standards.
• Packaging: All forgings and flanges are packed in wooden boxes or crates or pallets to ensure safe movement of the goods.

Manufacturing process of MSS SP44 plate cutting flange

The process here is relatively simple, and the key raw material is hot rolled plate. The process is mainly used to produce lower thickness sliding plate flanges and blind flanges. All plates purchased are accompanied by a test certificate to MSS SP44 Standards. The circles are cut from the plates. No heat treatment is involved in the flange manufacturing process. Drilling and machining is carried out on the circles to obtain the required dimensions. The goods are visually inspected and marked in accordance with the relevant standards.

Marking of MSS SP44 Flanges

MSS SP44 flanges are typically marked with certain information to identify the specific type of flange and its characteristics. This information may include the manufacturer’s name or logo, the flange size and rating, the material grade, and any relevant certifications or standards that the flange meets. For example, an MSS SP44 flange may be marked with a size such as “6 inch” to indicate the diameter of the flange, and a rating such as “150#” to indicate the pressure rating of the flange. It may also be marked with a material grade such as “A105” to indicate the type of material the flange is made from, and a certification such as “ASME” to indicate that it meets the standards set by the American Society of Mechanical Engineers. The male flange is usually identified with an “M” or “Male” marking, while the female flange is marked with an “F” or “Female” marking. Additionally, the flange size, pressure rating, and material may also be marked on the flange for further identification and proper installation. In addition to these markings, MSS SP44 flanges may also have other markings such as heat numbers or serial numbers for traceability purposes. These markings may be stamped, laser etched, or otherwise inscribed on the flange to ensure that the flange can be traced back to its manufacturing source if necessary.

Packing of MSS SP44 Flanges

How to package MSS SP-44 flanges? To pack the MSS SP-44 flange, follow these steps:

1. Clean and inspect the MSS SP-44 flanges for any damage or defects.
2. Wrap each flange individually in a protective material such as bubble wrap or foam.
3. Place the wrapped flanges in a sturdy box or crate, ensuring they are secure and cannot move around during shipping.
4. Fill any remaining space in the package with additional padding or filler material to prevent shifting during transport.
5. Seal the box or crate securely with tape or strapping.
6. Label the package with the recipient’s address, return address, and any necessary shipping labels or warnings.

Inspection and measurement of MSS SP44 Flanges

There are several factors that need to be considered when inspecting and measuring MSS SP44 flanges, including:

• Material: MSS SP44 flanges are typically made of metal, and it is important to select the correct material for the intended application. Common materials used for MSS SP44 flanges include carbon steel, stainless steel, and aluminum.
• Dimension: The dimensions of the flange, including the diameter, thickness, and bolt hole size, should be checked to ensure that they meet the required specifications.
• Surface finish: The surface finish of the flange should be smooth and free from defects such as scratches, dents, or cracks.
• Bolt hole alignment: The bolt holes in the flange should be properly aligned to ensure that the bolts can be easily inserted and tightened.
• Bolt hole size: The bolt holes should be the correct size for the bolts being used, and should not be oversized or undersized.
• Bolt hole thread: The threads on the bolt holes should be in good condition and should not be damaged or stripped.
• Gasket surface: The gasket surface on the flange should be smooth and free from defects, as this will ensure a good seal when the flange is tightened.

To inspect and measure MSS SP44 flanges, you will need a set of calipers or a micrometer to accurately measure the dimensions of the flange. It is also a good idea to have a torque wrench on hand to ensure that the bolts are tightened to the correct torque specification.

Application of MSS SP44 Flanges

MSS SP44 Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. These MSS SP44 Flange is use in various industries like:

• Stainless Steel MSS SP44 Flange uses in Oil and Gas Pipeline;
• MSS SP44 Flange uses in Chemical Industry;
• Alloy Steel MSS SP44 Flange uses in Plumbing;
• MSS SP44 Flange uses in Heating;
• MSS SP44 Flange uses in Water Supply Systems;
• MSS SP44 Flange uses in Power Plant;
• MSS SP44 Flange uses in Paper & Pulp Industry;
• MSS SP44 Flange uses in General Purpose Applications;
• MSS SP44 Flange uses in Fabrication Industry;
• MSS SP44 Flange uses in Food Processing Industry;
• MSS SP44 Flanges uses in Structural Pipe.

How to purchase the correct MSS SP44 flanges?

To purchase the correct MSS SP44 flanges, you will need to consider the following factors:

• Size and type of MSS SP44 flange: The size of the MSS SP44 flanges must match. It is important to select the right size and type of flange for your specific application to ensure it is installed properly and provides a secure connection.
• Material of MSS SP44 flange: The material of MSS SP44 flanges can vary depending on the specific application and requirements. Common materials for flanges include carbon steel, stainless steel, and various alloys such as Inconel or Monel. The material chosen should have appropriate strength, corrosion resistance, and other properties needed for the specific operating conditions. For example, if the flange will be used in a corrosive environment, a stainless steel flange may be better than a carbon steel flange.
• Pressure Rating of MSS SP44 flange: The pressure rating of MSS SP44 flanges is typically the same, as it is determined by the pressure rating of the flange itself and not by the gender of the flange. However, it’s important to ensure that the pressure rating of the mating flanges (i.e., the MSS SP44 flanges that are bolted together) are the same to avoid any potential leaks or failures.
• Connection Type of MSS SP44 flange: The connection type of the MSS SP44 flanges should be compatible with the piping or equipment being used.
• Standard of MSS SP44 flange: The MSS SP44 flanges should conform to relevant standards, such as ANSI, ASME, or API.
• Certification: The MSS SP44 flanges should have appropriate certifications, such as ISO, CE, or API, to ensure their quality and suitability for the intended use.

Selecting the right MSS SP44 flanges involves considering size, material, pressure ratings, and necessary features for the application. It is recommended to buy from a reliable manufacturer or supplier to ensure product quality.  
 

How to select MSS SP44 flanges manufacturer?

There are several factors you may want to consider when selecting an MSS SP44 flange manufacturer:

• Determine your needs: Assess the specifications and requirements of your flange project such as size, pressure rating, material, and application.
• Quality: Look for a manufacturer with a reputation for producing high-quality flanges that meet industry standards and have undergone rigorous testing.
• Experience: Choose a manufacturer with experience in producing MSS SP44 flanges for a wide range of industries and applications.
• Customization: Consider whether the manufacturer can offer customized flanges that meet your unique needs.
• Cost: Compare the prices of different manufacturers, but be aware that the cheapest option may not always provide the best value for money.
• Location: Choose a manufacturer that is conveniently located and able to deliver your flanges on time.
• Research manufacturers: Look for reviews and recommendations from other customers, and check the manufacturer’s website for information on their products and services.
• Request quotes: Contact several manufacturers to request quotes for your flange project.
• Review the quotes: Compare the quotes you receive, taking into account the price, quality, and delivery times.
• Consider other factors: Look for additional services offered by the manufacturer, such as technical support or after-sales service.
• Make your selection: Choose the manufacturer that offers the best combination of quality, experience, customization, and cost, and that can meet your specific needs and requirements.

Factors to consider when selecting a MSS SP44 flange manufacturer include evaluating the specifications and requirements of the project, selecting a manufacturer known for producing high quality flanges, finding a manufacturer with experience producing flanges for a wide range of industries and applications, considering the manufacturer’s ability to provide custom flanges, comparing prices while keeping in mind that the cheapest option may not always provide the best value, selecting a manufacturer that is conveniently located and can deliver on time, research manufacturer reviews and recommendations, request quotes and compare, look for additional services offered by the manufacturer, and select the manufacturer that best meets your needs and requirements.

Export Country For MSS SP44 Flanges  

MIDDLE EAST	AFRICA	NORTH AMERICA	EUROPE	ASIA	SOUTH AMERICA
Saudi Arabia	Nigeria	Usa	Russia	India	Argentina
Iran	Algeria	Canada	Norway	Singapore	Bolivia
Iraq	Angola	Mexico	Germany	Malaysia	Brazil
Uae	South Africa	Panama	France	Indonesia	Chile
Qatar	Libya	Costa Rica	Italy	Thailand	Venezuela
Bahrain	Egypt	Puerto Rica	Uk	Vietnam	Colombia
Oman	Sudan	Trinidad And Tobago	Spain	South Korea	Ecuador
Kuwait	Equatorial Guinea	Jamaica	Ukraine	Japan	Guyana
Turkey	The Republic Of Congo	Bahamas	Netherland	Sri Lanka	Paraguay
Yemen	Gabon	Denmark	Belgium	Maldives	Uruguay
Syria			Greece	Bangladesh
Jordan			Czech Republic	Mayanmar
Cyprus			Portugal	Taiwan
			Hungary	Cambodia
			Albania
			Austria
			Switzerland
			Slovakia
			Finland
			Ireland
			Croatia
			Slovenia
			Malta