How to Select Pipe Flanges                                      Image Credit: George Fisher Piping Systems, Sandvik Materials Technology, British Metrics   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...
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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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