Slip-on flanges are installed on pipes by slipping on the flange bore over the outside diameter of pipe and securing it to the pipe by fillet welds. There is no full penetration weld between the pipe and slip-on flanges, hence the joint cannot be subject to radiography. A slip-on flange can have a single filled weld or double fillet weld. As per para 328.5.2 of ASME B31.3, if slip-on flanges are single welded the weld is required to be made at the hub. Where two welds are required, one fillet weld is made at the hub of the slip-on flange and the second fillet weld is made at the inside diameter of the flange close to the flange face. The position of pipe inside the slip-on flange should be such that the fillet weld can be carried out without damaging the flange face.The size of fillet weld on the inside of flange is equal to the lesser of pipe wall thickness or 6mm.
ASME B31.3 provides three options of weld details for double-welded slip-on flanges. A slip-on flange shall be double-welded as shown in Fig. 328.5.2B of ASME B31.3 when the service is

• subject to severe erosion, crevice corrosion, or cyclic loading
• flammable, toxic, or damaging to human tissue
• under severe cyclic conditions
• at temperatures below −101°C (−150°F)

• lower procurement cost
• less skill required for installing due to use of fillet welds instead of full penetration butt weld
• weld end preparation not required on pipe ends
• reduced accuracy in the cut length of pipe

• flange installation requires the use of two fillet welds
• non-destructive examination is required on two welds which makes the installation cost approximately the same as weld neck flange
• slip-on flanges are unsuitable for cyclic loading as mentioned above
• slip-on flanges are not available in sizes 2½ inches and over in class 1500 rating and not available in any size for class 2500 rating
• the strength of a slip-on flange is less than that of a weld neck flange due its design (less reinforcement in the hub) and installation method (fillet weld instead of butt-weld)

Steel Flanges
Flange Type:Weld Neck Flange,  Socket Weld Flange,  Slip On Flange,  Blind Flange,  Thread Flange, 
Lap Joint Flange,  Plate Flange,  Orifice Flange,  Spectacle Flange,  Figure 8 Flange, 
Paddle Blank,  Paddle Spacer,  Anchor Flange,  Single Blind,  Ring Spacer,
Reducing Socket Weld flange, Reducing Weld Neck flange, Long Weld Neck Flange,
SAE Flanges, Hydraulic Flanges,
Customized Flanges with drawing. 

Material Carbon steelA105, A105N, ST37.2, 20#, 35#, C40, Q235,
A350 LF2 CL1/CL2, A350 LF3 CL1/CL2, 
A694 F42, F46, F50, F60, F65, F70, 
A516 Gr.60, Gr.65, Gr.70
 Alloy steelA182 F11, A182 F22
 Austenitic stainless steelA182 F304/304L, F316L, A182 F316H,
F310,  F321, F321H, F347, F347H
 Duplex stainless steelA182 F51
 Super Duplex stainless steelA182 F53, A182 F55, A182 F60
 Nickel alloyNickel 200, Nickel 201
 Titanium alloyTitan Gr.1, Titan Gr.2
 HastelloyHastelloy C-276, Hastelloy C-22, Hastelloy C-4
 InconelInconel 600, Inconel 625, Inconel 800, Inconel 800H
 MonelMonel 400, Monel K500
 
SizeDN15 -   DN3000
 PressureClass 150#  - 2500#,  PN 2.5- PN40, JIS 5K - 20K, 3000PSI, 6000PSI
 Connection WayFlat Face (FF),  Raised Face (RF), Ring Joint (RTJ), MFM, TG
 StandardASME, ANSI, DIN, EN, BS, JIS, GB, AWWA, API, SAE, GOST, MSS
 Technical Forged
 PackagePlywood Case/ Wooden Case/ Customized Package
 BrandST
 CertificatesAPI, ISO, PED, EC, EU

PIPE FITTINGS Flange
Production Name	Carbon Steel Flange ASTM ANSI JIS DIN SCH RF WN SO 150 LB
Size Range	From ½" up to 48 "
Schedule	SCH STD, XS, XXS, SCH 10 ~ SCH 160
CARBON STEEL	ASTM A234 WPB, WPC; ASTM A420 WPL9, WPL3, WPL6, WPHY-42
STANDARDS	ANSI, ISO, JIS, DIN, BS,GB, SH, HG,QOST,ETC.
CE and certification:	ISO9001:2000 , API , BV , SGS, LOIYD
Applications range:	Petroleum, chemical, power, gas, metallurgy, shipbuilding.construction,water and nuclear power etc.
Packaging:	seaworthy package,Plywood Cases or pallet or as per customers requirement
The third party inspection:	BV,SGS,LOIYD,TUV,and other party alloyed by clients.
Delivery Time:	At the earliest ,within the period required by customer.
Remark:	Also can supply IBR fittings and Specialized NACE & HIC Fittings.

Established in 1989, Hebei Shengtian Pipe-Fitting Group Co., Ltd. located in Mengcun County Hebei Province China, covering a land area of 100,000 square meters, with a workshop of 25,000 square meters and registered capital of 110 million RMB. Our company has a strong staff team. There are over 360 employees, including over 30 professionals and technicians.

We are capable of manufacturing various pipe fittings. Our main products scope: steel elbow, tees, bends, reducers, caps, forged flanges and sockets. We have been in this line for over 20 years. Our products are exported to many countries and regions, such as Southeast Asia, the Middle East, Europe and America etc. Our pipes and pipe fittings enjoy a good reputation in domestic and foreign markets. Every year, hundreds of foreign visitors and innumerable domestic visitors come to our company for business cooperation.

We have first-class inspection devices, perfect detecting means and well-trained specialists. And we stick to ISO9000:2000 quality system and efficiently control procedure in production. We have confidence that we can supply the best quality products. We would like to take responsibility for any quality uncertainty. Even so, our price is competitive. Besides, we can provide the best service to you.

In order to avoid the policy of the anti-dumping duties imposed on pipe & fittings from the Europe, United States and other countries, We can re-export through other countries like Malaysia, etc, to circumvent the anti-dumping duties, which could make you to win more competitive price.

Our products are in compliance with many international standards

Pipe Standard: ASTM A53,A106,API 5L,ASME B36.10M---1996.

Pipe-Fittings Standard: ANSI B16.9/16.28,DIN 2605 / 2616,JIS P2311 / 2312,GOST.

Flange Standard: ANSI B16.5,DIN Series,JIS Series,GOST Series.

KEYWORD: butt welded pipe fittings,ANSI B16.9 pipe fittings,seamless pipe fitting.