Pipe flanges are protruding rims, edges, ribs, or collars used to make a connection between two pipes or between a pipe and any type of fitting or equipment component. Pipe flanges are used for dismantling piping systems, temporary or mobile installations, transitions between dissimilar materials, and connections in environments not conducive to solvent cementing.   Flanges are relatively simple mechanical connectors that have been used successfully for high-pressure piping...
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Q & A on Pipe Flanges

We asked our users for their input on Pipe Flanges. Here are the results of 37 users familiar with Pipe Flanges.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing pipe flange design?
3 answers
Answers:
Not sure, I am an old-school flange designer. I would have to assume that finite element analysis has thoroughly changed flange design in the last 15 years.
~Keith C, General Management, Houston, TX
Updated national standards
~Lee S, General Management, Owings Mills, MD
Dairy and food industry
~Engineering, Consulting, Caracas, Venezuela

Q:
From your perspective, which companies are creating the most innovative pipe flanges?
3 answers
Answers:
I am getting my pipe flanges from a distributing company.
~Ed P, Project/Engineering/Maintenance Manager, Towanda, PA
Many, difficult to name.
~Kanaiyalal B, Sales, Leeway, U.S.A
European producers
~Hbaieb Med, Purchaser, Tunisia, Tunisia

Applications and UseTop

Q:
Please share with us any “non-standard” applications that pipe flanges have been used for.
2 answers
Answers:
I have designed many flanges in which the sealing means was non-standard, such as ring gaskets in flanges not originally intended for them. I have a design on my board now in which flanges are engineered with larger gaskets than normal, e.g., an API 9-inch 5ksi flange with ring gaskets of 11-inch size. Also, specialty lightweight flanges for offshore or subsea use.
~Keith C, General Management, Houston, TX
Mating flanges from DIN to USA standards. Mating flanges from JIS to USA standards.
~Lee S, General Management, Owings Mills, MD

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of pipe flanges?
2 answers
Answers:
None that was first-hand enough to list here as truth. However, anecdotally, have heard 2nd- and 3rd-hand about several over the years.
~Keith C, General Management, Houston, TX
Not disastrous, avoidable maybe.
~Ed P, Project/Engineering/Maintenance Manager, Towanda, PA

Q:
What pipe flanges have you used?
16 answers
Answers:
2" to 8" Pipe sizes, Class 125 and Class 150, Threaded, slip-on and Butt-welded, steel, brass and pvc.
~Ed P, Project/Engineering/Maintenance Manager, Towanda, PA
125# Companion Flanges 150#, 300#, 600# Weld Neck and Slip On flanges
~Engineering, Consulting, Vancouver, Canada
I did not use but manufactured and sold ASA, AWWA, API pipe flanges.
~Marketing/Sales, Bunkie, LA
All types, blinds, weld necks, slip on. Socket weld, hub flanges.
~Purchasing, Sarnia, Canada
All pipe and flanges following project technical specifications.
~Hbaieb Med, Purchaser, Tunisia, Tunisia
Welding neck, blind, ferrule, lap-joint.
~Engineering, Consulting, Caracas, Venezuela
API, ANSI, AWWA, and custom-built
~Keith C, General Management, Houston, TX
6 inches steel 9 inches steel
~Research & Development, Cali, Colombia
DIN, DIN EN, JIS, BS, UNI, AS
~Lee S, General Management, Owings Mills, MD
Forged & Plate Flanges
~Purchasing, Aurangabad, India
150, 300, 600, 900 lbs
~Engineering, Design, Bogotá, Colombia
ANSI, DIN, JIS
~Engineering, Consulting, Winchcombe, Great Britain
Forged, plate
~Engineering, Design, DELHI, India
All kinds
~Manufacturing, Gimhae city,, Korea (South)
All types
~Kanaiyalal B, Sales, Leeway, U.S.A
API 5L
~Project Management, Broxburn, Great Britain

FeaturesTop

Q:
What would your design or feature "wish list" be for these products?
4 answers
Answers:
A universal design, capable of being threaded and welded, in one piece will be nice.
~Ed P, Project/Engineering/Maintenance Manager, Towanda, PA
Direct mating between classes 150 & 300, classes 300 & 600
~Engineering, Consulting, Caracas, Venezuela
Competitive price
~Kanaiyalal B, Sales, Leeway, U.S.A
Petrol
~Hbaieb Med, Purchaser, Tunisia, Tunisia

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using pipe flanges?
4 answers
Answers:
The cost-effective use of lightweight designs for offshore use can gain indirect benefits due to weight savings. Hard to assess dollar benefits for this but it is a real advantage given the high payload cost on rigs, platforms, etc.
~Keith C, General Management, Houston, TX
See: http://mdmetric.com/tech/dinflangedata.htm
~Lee S, General Management, Owings Mills, MD
To buy new pipe & not stocked in open area.
~Hbaieb Med, Purchaser, Tunisia, Tunisia
Know your application and supplier.
~Ed P, Project/Engineering/Maintenance Manager, Towanda, PA

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of pipe flanges?
3 answers
Answers:
I recommend a familiarity with manual design procedures before trusting FEA as gospel. Find a copy of the legendary EPG/Taylor Forge "Modern Flange Design" book from the '70s and get familiar with the ASME rules for manual flange design. Design a few by hand, then compare to your FEA results. Read the work of Timoshenko, a structural engineering pioneer, who was one of the earliest people to define the design principles of flanges.
~Keith C, General Management, Houston, TX
Verify for the welded pipe the reputation of constructor and take the welding certificate.
~Hbaieb Med, Purchaser, Tunisia, Tunisia
Know your application.
~Ed P, Project/Engineering/Maintenance Manager, Towanda, PA


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