What is a pilot bore?
Is this a MUST to provide when customer orders a blank plate?
What will be the effect of customer boring themselves if not provided with a pilot bore during purchased?
In addition to the above, i am curious to know about trims. i cannot find anything from GOOGLE on trims.
What is this "trim" in orifice fitting? What is standard NACE trim, AASG trim or Standard "A" trim. How does a trim look like. The orifice fitting brochure has no picture or diagram of a trim....
In reply to Anonymous:
The better to use "oriface plate" to search it out from Google ...
Question No. 1
A pilot hole is drilled in all 10” and larger DVS Bonded Orifice Plates. The purpose of the pilot hole is to insure the following:
a) Concentricity
b) Eliminate the mold from floating during bonding
c) Facility orifice plate centering during set up prior to the boring process
Smaller Non-Bonded BLANK orifice plates do not require pilot holes however the following applies:
a) The Daniel Name & Logo will be XXX out.
b) Daniel does not warrant the plate
c) Daniel will not guarantee the orifice plate to be in compliance with AGA 3 / API 14.3 standard
Attached please find the trim selections used for 2”- 14” ANSI 150# – 600# Senior Orifice Fittings The attachment is a un-controlled document subject to engineering changes or modifications. The document is not to be incorporated into any published literature without prior approval.
You might also find this emerson white paper useful: Fundamentals of Orifice Meter Measurement
www2.emersonprocess.com/.../Fundamentals-of-Orifice-Measurement-techWpaper.pdf
In reply to Ldickenson:
If you find yourself curious about differential pressure flow measurement. Control Global did a couple educational, Back to Basics video series. Here's the video on DP..
http://youtu.be/R9MJEjgrUqo
What standard does a DANIEL ORIFICE PLATE 316SS material conforms to with reference to ASME
There are several standards regarding orifice plate specification and tolerances.
AGA 3
API Chapter 14.3
ISO 5167-2
ASME Fluid Meters
ISA
Each standard may be somewhat different relative to compliance with orifice plate edge sharpness, & thickness etc.. Most orifice plates are manufactured from either 304 or 316 Stainless Steel. In addition to stainless steel Daniel has also manufactured orifice plates from Monel – Hastalloy and Inconel. The ISO and ASME standard are very similar as is AGA & API.