ASME B16.36
Orifice flanges
Covers orifice flanges — weld neck, slip-on and threaded flanges with pressure tapings for flow measurement across an orifice plate.
- Dimensional standards
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASME B16.36?
ASME B16.36 is the standard for orifice flanges — flanges with radial pressure tappings drilled through the rim for flow measurement across an orifice plate. It covers weld neck orifice flanges in Classes 300 to 2500, and slip-on and threaded orifice flanges in Class 300; orifice flanges are supplied in pairs with jackscrews to separate them. Material comes from a specification such as ASTM A182 or ASTM A105.
ASME B16.36 at a glance
| Product | Orifice flanges (with pressure tappings) |
|---|---|
| Types | Weld neck, slip-on, threaded |
| Classes | Weld neck 300 – 2500 · slip-on and threaded Class 300 only |
| Supplied as | Matched pairs with jackscrews |
| Material | Named separately |
How to write ASME B16.36 on a purchase order
Name the product, size, material specification and grade, the dimensional standard and the certificate. An example line:
Illustrative only — sizes, tests, inspection level and any project values come from your purchase specification.
ASME B16.36 edition and verification status
Which edition we have confirmed, and what is still being checked before any numerical requirement is published here.
| Current edition | Not yet confirmed against the publisher listing |
|---|---|
| Full-text verification | In progress — numerical requirements are not published on this page |
| Edition on your order | The edition named in your purchase order or design code governs — confirm it with your enquiry |
What to know before ordering to ASME B16.36
The points that decide whether material to ASME B16.36 is accepted at inspection.
- Orifice flanges are supplied in pairs with jack screws.
- Tapping size and position are set by the standard.
- Material follows the flange material specification.
How ASME B16.36 fits into an order
A purchase order line is only complete when it names the material standard, the dimensional standard and the inspection document. Miss one and the mill, the inspector and the buyer can each read the order differently.
Standards used with ASME B16.36
Same family
ASME B16.36 — questions buyers ask
What is ASME B16.36?
ASME B16.36 is the standard for orifice flanges — flanges with radial pressure tappings drilled through the rim for flow measurement across an orifice plate. It covers weld neck orifice flanges in Classes 300 to 2500, and slip-on and threaded orifice flanges in Class 300; orifice flanges are supplied in pairs with jackscrews to separate them. Material comes from a specification such as ASTM A182 or ASTM A105.
Why are orifice flanges thicker than normal flanges?
To make room for the radial pressure tappings drilled through the flange rim.
Is there a Class 150 B16.36 orifice flange?
B16.36 starts at Class 300; low-pressure orifice runs commonly use Class 300 orifice flanges.
Does ASME B16.36 specify the material?
No. ASME B16.36 sets dimensions; the material comes from a separate specification such as ASTM A182, A105 or B564 for flanges, or A403 and B366 for fittings. A complete order names both.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026