Why flange bolt holes straddle centerlines?

Asked by: Miss Shana Kohler Jr.
Score: 4.9/5 (20 votes)

For a horizontal flange face (the flange face is horizontal and the line is vertical above or vertical down) the bolt holes want to be orientated to straddle the Plant North centerlines. ... This centerline rule for flanges, understood and followed by all responsible equipment manufacturers and piping fabricators.

What is a flange hole?

Hole to Wall Hole to Trim Hole to Hole Complex Hole Description A flanged hole has a continuous flange around a circle or oblong. Purpose The purpose of this check is to ensure that the flange hole shape can be manufactured using standard pierce equipment.

What is the purpose of the 2 flange bolts?

Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.

Do flange bolts need washers?

Flanged headed nuts and bolts have been developed to eliminate the deficiencies that have been found with the use of washers. Standard washers are typically softer than the nuts and bolts that they are used with and can often plastically deform under the high compressive stress that they must sustain.

21 related questions found

Is flange a fitting?

Pipe Flanges are widely used as a popular category of pipe fittings. A flange is used to mechanically connect two pipes together. ... Thus, flanges are considered to be projecting or internal components which are used to support mechanical parts.

How do you know if you need smaller flanges?

If your nipple is able to move freely in the tunnel, you may notice a bit of areola pulling into the tunnel with each pumping cycle. If there is no areola movement, your flange might be too small. If there is too much movement, it might be too big.

How thick should a flange be?

Therefore the best solution is to use or design flanges with higher available compressive loads, keep the surface finish in good condition, and use 1.5 mm or even 1.0 mm thick gaskets whenever possible. Less than perfect flanges however still need to be sealed.

What are the different types of flanges?

Most commonly used flanges are weld neck flange, slip on flange, blind flange, socket weld flange, threaded flange and lap joint flange (RTJ Flange). This type of connection in a pipe flange allows for ease of disassembly and separation for repair and regular maintenance.

What does the term 2 hole mean?

: the favored position at the rail behind the lead horse in harness racing.

What is the importance of aligning the holes of flanges to be welded?

Proper alignment is important if a piping system is to be correctly fabricated. Poor alignment may result in welding difficulties and a system that does not function properly. Welding rings may be employed to assure proper alignment as well as the correct welding gap.

Can you weld a slip on flange to a 90 degree elbow?

There is no Code restriction against welding a Slip-On (SO) Flange directly to an elbow, a Reducer, a Tee or any other fitting.

What happens if your flange is too big?

If your breast pump flange is too big you may experience:

Your areola could become pulled into the flange and tunnel. Painful nipple pinching, pulling, and squeezing. Lower breast milk production. Your nipple or areola could become white or discolored.

What is the smallest flange size?

The smallest flange size is sold by Maymom and measures in at 13mm. Maymom makes aftermarket flanges for big pump brands like Spectra and Medela, which can be purchased for less than $30 bucks. The next size up is 15mm, and they make a 17mm- all of which are under the standard 24s that come with most pumps.

What size flange should I use when pumping?

If your nipple measures 16 mm in diameter, your recommended breast shield size is 21 mm. This is because the 21 mm shield fits nipples up to 17 mm in diameter. If your nipple diameter measures 24 mm, your recommended size would be 30 mm.

Is standard for flange?

ANSI B16. 5 -1996 is the official standard for ANSI Class Pipe Flanges and Flanged Fittings, applied specifically to those made from cast or forged materials, as well as blind flanges and some reducing flanges crafted in cast, forged, or plate.

Is 1538 flange dimensions in MM?

Saini Flange – IS 1538-1976 (PART V) Note: All Dimensions are in millimeters. Dimensions are not to scale.

What is the difference between ASME and DIN flanges?

RE: DIN Standard Flanges vs ASME Flange Ratings

DN is not short for DIN, but in metric units is the same as ND for ASME pipe and fittings. Hence DN 150 is directly equivalent to 6" pipe. PN on the other hand is max pressure rating in barg. This goes in the sets 2.5, 6,10,16,25,40,64,100.

What is the difference between lap joint flange and slip on flange?

lap joint flanges are very similar to a slip-on flange, with the main difference being that it has a curved radius at the bore and face to house a lap joint stub-end. Lap joint flanges and stub-end assemblies are typically used in situations where frequent dismantling is required for for inspection.

What do the numbers mean on a flange?

The key sizes for a pipe flange are: the nominal size (i.e. the bore size of the flange, to match the bore size of the connecting pipe) the flange rating (which designates the pressure/temperature performance of the flange, i.e. 150#, 300#, 400#, up to 2500#)