p1

EN 12952-1:2001 (E) 4 Symbols and abbrevations For the purposes of this European Standard, the general symbols and abbreviations given in table 4-1 and table 4-2 shall apply. Table 4-1 — Symbols Symbol Description Unit A area mm 2 A f effective cross-sectional area without allowances mm 2 A fb effective cross-sectional area of branch mm 2 A fp effective cross-sectional area of reinforcing ring mm 2 A fs effective cross-sectional area of body mm 2 A p pressurized area without allowances mm 2 A pb pressurized area referred to branch mm 2 A ps pressurized area referred to body mm 2 C shape factor — C 1 shape factor for unstayed walls, ends or plates — C 2 shape factor for rectangular and elliptical plates — C 3 shape factor for flat plates with openings — c 1 minus tolerance on the ordered nominal wall thickness mm c 2 allowance for metal wastage mm D b mean diameter of flat ends with knuckle or design diameter of flat cover plates mm D L bolt circle diameter mm d diameter of tube hole (if applicable in the condition after metal wastage) mm d i inside diameter mm d ib inside diameter of branch without allowances mm d is inside diameter of main body (cylindrical shell, spherical shell or dished end) without allowances mm d m mean diameter mm d o outside diameter mm d ob outside diameter of branch without allowances mm d os outside diameter of main body without allowances mm d s stay diameter mm E modulus of elasticity at design temperature N/mm 2 e wall thickness mm e b ordered wall thickness of the branch mm e cb required wall thickness of branch or nozzle without allowances mm e ch required wall thickness of flat end without allowances mm e cs required wall thickness of cylindrical or spherical shells or dished end without allowances mm 7 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Aug 23 10:12:55 GMT+00:00 2007, Uncontrolled Copy, (c) BSI www.bzfxw.com

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EN 12952-1:2001 (E)

4 Symbols and abbrevations

For the purposes of this European Standard, the general symbols and abbreviations given in table 4-1 and table 4-2shall apply.

Table 4-1 Symbols

Symbol Description Unit

A area mm2

Af effective cross-sectional area without allowances mm2

Afb effective cross-sectional area of branch mm2

Afp effective cross-sectional area of reinforcing ring mm2

Afs effective cross-sectional area of body mm2

Ap pressurized area without allowances mm2

Apb pressurized area referred to branch mm2

Aps pressurized area referred to body mm2

C shape factor C1 shape factor for unstayed walls, ends or plates C2 shape factor for rectangular and elliptical plates C3 shape factor for flat plates with openings c1 minus tolerance on the ordered nominal wall thickness mmc2 allowance for metal wastage mmDb mean diameter of flat ends with knuckle or design diameter of flat cover plates mmDL bolt circle diameter mmd diameter of tube hole (if applicable in the condition after metal wastage) mmdi inside diameter mmdib inside diameter of branch without allowances mmdis inside diameter of main body (cylindrical shell, spherical shell or dished end) without

allowancesmm

dm mean diameter mmdo outside diameter mmdob outside diameter of branch without allowances mmdos outside diameter of main body without allowances mmds stay diameter mmE modulus of elasticity at design temperature N/mm2

e wall thickness mmeb ordered wall thickness of the branch mmecb required wall thickness of branch or nozzle without allowances mmech required wall thickness of flat end without allowances mmecs required wall thickness of cylindrical or spherical shells or dished end without

allowancesmm

7Lic

ense

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py: I

nstit

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olog

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t, In

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Thu

Aug

23

10:1

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GM

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2007

, Unc

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Copy

, (c) B

SI

www.

bzfxw

.com