IPP Weld on Duo Flange System

IMPROVED PIPING PRODUCTS

A Strong Customer Connection

ABOUT IMPROVED PIPING PRODUCTS

Improved Piping Products has been supplying flanges for municipal and industrial plants since 1979. All phases of flange product development, sales and order processing are centralized in our headquarters in Orinda, California. Full warehousing facilities are located in San Leandro, CA, Houston, TX, St. Louis, MO and Towaco, NJ.

Our products conform to all applicable ASTM and ASME codes

Our advanced flange designs and stringent quality control assure you that IPP products will exceed your most demanding requirements. At IPP, product performance and customer satisfaction are corporate commitments.

slip on flange

DUOFLANGEŽ ...
THE MOST COST-EFFECTIVE
FLANGE CONNECTION
SYSTEM EVER OFFERED...

AND IPP MAKES IT!

Two high performance choices.

DUOFORGEŽ... the forged flange and stub-end combination

DUOCASTŽ... the ductile iron flange and forged stub-end combination.

IPP MAKES IT TO LAST

The DUOFORGE flange and slip-on stub-ends are manufactured in sizes 1" - 24" from ASTM A105 forged steel... the standard of the industry. The DUOCAST flange is made of tough, corrosion resistant ductile iron conforming to ASTM A 395. Both systems are rated at Class 150 for operating pressures up to 275 psi.

IPP has supplied special flange systems up to 34" Class 400.

IPP MAKES IT EASY TO INSTALL

DUOFLANGE eliminates the labor cost of two-hole alignment of the flanges. This can save up to 30% of the labor associated with installing the flanges.

Because the IPP DUOFLANGE is free to rotate on the welded stub end, it is easy to fit-up to mating welded flanges. No need for permanent leveling, squaring and mating the bolt holes. Simply turn the DUOFLANGE until the bolt holes are aligned and install the bolts, nuts and washers. One man can do the job efficiently.

pipe flanges

FEATURES/BENEFITS


	Meets ANSI B16.5 dimensional criteria for complete interchange ability with Class 150 slip-on flanges
	Two-piece system -- easy to install- eliminates two-hole alignment process
	Forged flange conforms to ASTM A 105 Class 150
	Cast ductile iron flange conforms to ASTM A 395
	No special equipment required for field installation
	DUOFLANGE system actually reduces pipe wall stresses
	DUOFLANGES are reusable - the flange itself is not welded
	Heavy coat of primer standard (other finishes optional)
	Raised face for efficient ring-gasket seals
	Meets Section VIII, Division 1 ASME Pressure \/essel code

DUOFLANGE DIMENSIONS AND WEIGHTS (CLASS 150)

Flange						Stub End						Weights (lbs)
Pipe Size	A	F	G	B	nxd	C	D	E	H	T	R	Flange Weight	Stub End Weight	Total Weight
1"	4.25	1.79	.56	3.12	4X.63	2.00	1.36	1.73	.69	.18	.06	1.64	.22	1.86
1.5"	5.00	2.43	.69	3.88	4X.63	2.88	1.95	2.35	.88	.20	.09	2.69	.46	3.15
2"	6.00	2.95	.75	4.75	4X.75	3.63	2.44	2.88	1.00	.23	.13	4.16	.78	4.94
2.5"	7.00	3.61	.88	5.50	4X.75	4.13	2.94	3.52	1.13	.29	.13	6.58	1.24	7.82
3"	7.50	4.24	.94	6.00	4X.75	5.00	3.57	4.17	1.19	.30	.13	7.50	1.75	9.25
4"	9.00	5.39	.94	7.50	8X.75	6.19	4.57	5.30	1.31	.34	.13	9.89	2.87	12.76
5"	10.00	6.53	.94	8.50	8X.88	7.31	5.66	6.40	1.44	.37	.13	10.66	3.87	14.53
6"	11.00	7.61	1.00	9.50	8X.88	8.50	6.72	7.52	1.56	.43	.13	12.42	5.42	17.84
8"	13.50	9.69	1.12	11.75	8X.88	10.63	8.72	9.62	1.75	.44	.20	19.75	8.54	28.29
10"	16.00	11.92	1.19	14.25	12X1.00	12.75	10.88	11.79	1.94	.45	.25	25.91	11.45	37.36
12"	19.00	13.92	1.25	17.00	12X1.00	15.00	12.88	13.79	2.19	.45	.25	41.70	15.33	57.03
14"	21.00	15.29	1.38	18.75	12X1.13	16.25	14.14	15.16	2.25	.53	.25	60.36	19.19	79.55
16"	23.50	17.29	1.44	21.25	16X1.13	18.50	16.16	17.16	2.50	.53	.25	74.26	24.37	98.63
18"	25.00	19.37	1.56	22.75	16X1.25	21.00	18.18	19.24	2.69	.53	.25	77.60	32.31	109.90
20"	27.50	21.39	1.69	25.00	20X1.25	23.00	20.20	21.26	2.88	.73	.25	100.10	41.02	141.10
24"	32.00	25.44	1.88	29.50	20X1.38	27.25	24.25	25.31	3.25	.73	.50	140.70	55.78	196.50

Please contact IPP for the distributor closest to you.
Discounts Available on Request

DUOFLANGE ASSEMBLY

DUOFLANGE MATERIAL SPECIFICATIONS

duo pipe flanges

DUOFORGE FLANGE AND SLIP ON STUB-END	Forged Steel ASTM A 105
	Tensile Strength	70,000 psi min
	Yield Strength	36,000 psi min
	Elongation	22% 2" min
	Hardness (max)	187 HB

DUOCAST FLANGE	Cast Ductile Iron ASTM A 395 Heat Treated
	Tensile Strength	60,000 psi min
	Yield Strength	40,000 psi min
	Elongation	18% 2" min
	Hardness	143-187 HB

Flange stub-end assembly meets ANSI B16.5 dimensional criteria Class 150.
Same temperature/pressure curve applies.

COMPARATIVE ANALYSIS OF VON MISE STRESS LEVELS IN STANDARD PIPE SECTIONS, SIZE 24"

Finite element analysis actually proves DUOFLANGE reduces pipe wall stress by transferring loads from the pipe wall to the more massive stub-end.

FIG 1

FIG 2

FIG 3

AWWA C207 Slip-on Flange Class E (275 psi)
Table 4

AWWA C207 Steel Hub Flange Class E
(275 psi) or ANSI 816.5 Slip-on, Class 150
Table 3

IPP DUOFLANGE with Slip-on Stub-end
(275 psi)

The highest stress level in pipe section is near fillet weld. DUOFLANGE reduces stress levels by 37% (see figure 3)

Stress level in pipe section near fillet weld significantly reduced with hub or slip-on flange but exceeds DUOFLANGE stress level by 27%

DUOFLANGE produces the lowest pipe stress level by transferring loads into the forged stub-end.

IPP Systems Weld-on Duo Flange System
Slip-on Stub-end, Flange Engineered for Maximum Strength and Simple Installation