LARGE DIAMETER STEEL FLANGES NPS 26 THROUGH NPS 60 METRIC/INCH STANDARD

1 SCOPE

1.1 General

This Standard covers tension–temperature ratings,

components, dimensions, tolerances, marking, and checking out

for pipe flanges in sizes NPS 26 due to NPS 60.

Included right here are flanges with rating type designations

75, a hundred and fifty, 300, 400, 600, and 900 with requisites given

in both SI (metric) and U.S. Customary units, with diameter of bolts and flange Go here bolt holes expressed in inch units.

This Standard is limited to

(a) flanges fabricated from solid or forged elements

(b) blind flanges made up of solid, solid, or plate

resources (see Tables 1 and a couple of)

Also, included in this Standard are standards and

suggestions related to flange bolting, flange gaskets, and flange joints.

1.2 Flange Series

This Standard gives two series of flange dimensions. Series A specifies flange dimensions for widely wide-spread

use flanges. Series B specifies flange dimensions for compact flanges that, in most instances, have smaller bolt circle

diameters than Series A flanges. These two collection of

flanges are, in average, now not interchangeable. The consumer

will have to recognise that some flanged valves, tools

bolted between flanges, and flanged appliance will be

well matched with only one series of those flanges.

1.three References

Codes, standards, and requisites, containing provisions to the volume referenced herein, represent

requirements of this Standard. These reference records are listed in Mandatory Appendix III.

1.4 Time of Purchase, Manufacture, or Installation

The pressure–temperature ratings in this Standard are

suited upon its guide to all flanges inside its

scope that another way meet its requirement. For unused

flanges maintained in stock, the company of the

flange also can certify conformance to this Edition, equipped

that it'll be established that every one standards of this

Edition have been met. Where such resources were

set up according with the force–temperature scores of an earlier adaptation of this Standard, the ones rankings are perfect, except for as might possibly be ruled by using the

perfect code or rules.

1.5 User Accountability

This Standard cites tasks which can be to be

assumed by using the flange person inside the parts of, as an example

(a) application

(b) set up

(c) approach pressure trying out

(d) operation

(e) subject material choice

1.6 Quality Systems

Requirements with regards to the product brand’s

Quality System Program are defined in Mandatory

Appendix II.

1.7 Relevant Units

This Standard states values in equally SI (metric) and

U.S. Customary items. As an exception, diameter of bolts

and flange bolt holes are expressed in inch items only.

These approaches of contraptions are to be viewed one at a time as

generic. Within the text, the U.S. Customary items are

shown in parentheses or in separate tables. The values

acknowledged in every device usually are not specific equivalents; thus,

this is required that each machine of items be used independently of the other. Except for diameter of bolts and

flange bolt holes, combining values from the 2 strategies constitutes nonconformance with the Standard.

1.8 Service Conditions

Criteria for determination of constituents fantastic for explicit fluid carrier don't seem to be within the scope of this Standard.

1.9 Convention

For the motive of choosing conformance with

this Standard, the conference for solving magnificent digits

wherein limits, optimum and minimal values are specified, will probably be rounded as outlined in ASTM Practice E 29.

This calls for that an determined or calculated price shall

be rounded off to the nearest unit inside the last top hand

digit used for expressing the minimize. Decimal values and

tolerances do not suggest a selected technique of dimension.1.10 Denotation

1.10.1 Pressure Rating Designation. Class, adopted

by a dimensionless number, is the designation for

stress–temperature ratings (i.e., classification 75, elegance a hundred and fifty,

classification three hundred, class 400, category 600, type 900).

1.10.2 Size. NPS, observed through a dimensionless

variety, is the designation for nominal flange measurement. NPS

is associated with the reference nominal diameter, DN, used

in worldwide and different specifications. For the sizes covered in this Standard, the relationship is: DN p 25 NPS.