7/28/2019 Orifice Straight Lenghth Standard

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Table 3 - Requi red straight lengths between orifice plates and fittings without flow conditionersValues exp ressed as mul tiples of internal diameter, D

e~

~I~c5'

iJ

I

Downstream

Upstream (I nlet) sid e of orifice plate (outlet) sideoftha

orifice plate

DlamTwo 90

Single 45"at er 'Two 9 0' Two 90 bendra tlb

Singla 90" be nds Inbend s In bends ' In

Two 9 0 Single 90 Concent ric Concent ric The r- Fitt ingsben d thess rne ban ds In tee with or Tw o 45

0 F ull bo re momater/l the sam e pe rpen- reducer axpander fcolumna2plane : . withou t a n bends In ball valve Abrupt p()ckatTw O 9 0 plane: dreular

parpan -tMaame

2Dto D O,5Dto Dsymm etrical

to 11) andbends In S-conflgur. dlcurar eJ rten s lon

or gate .orwellc thaden$l-S-conflgu r plan es plaM; over a over. valve f ully reduc tionany plane atl on planes lenglhof length of of dIamet e r tornetaratlon Mitre 90 s .conflgur- open(30D ~S ;;l:(5D > .Si

B b bend

1,5Dto

3D Dto2D'" O,Q3 Dd

pocket(S > 3OD) EI (30D;. S> (10 D;. $) B 5D)a atlon10D) a

(.5'' ''2D)8

1 2 3 4 5 6 7 8 9 10 11 12 13 '14

- AB 8' AB. a ' AB Sf Ae Sf Ae Sf Ae af Ae 8 f Ae Sf .AO a.' Ae S ' AB 8' A9 Sf Ae af

~O,20 6 3 10 9 10 9 19 18 34 17 3 9 7 9 s 9 6 g 12 6 30 15 5 3 4 20, 4 0 16 3 10 9 10 9 44 18 50 26 9 3 30 9 5 9 12 8 12 6 30 15 5 3 6 3

0 ,5 0 22 9 18 10 22 10 44 18 75 34 19 9 30 18 8 5 20 9 12 6 30 15 5 :3 6 3

0,60 42 13 30 18 4 2 18 44 18 65" 25 29 18 30 18 9 5 26 11 14 7 30 15 5 3 7 3,5

0,67 4 4 2 0 44 18 44 20 44 20 60 18 36 18 44 18 12 6 28 14 18 9 30 15 5 3 7 3,.5

0,75 44 20 44 18 44 2 2 44 20 75 1 8 44 18 44 18 13 8 36 18 24 12 30 15 5 3 8 4

NOTE 1 The mnimum Irtmght length s requir ed _ the len9 1hS be tween v~oua f ittings lo ca ted upstream or down $1rea m of th e Orific e pla te and th e o rifice plate il$elf . Stra ight length s 9hall be measur ed f rom thedownst ream en d 01th e curv ed portion oflhe n ea reet(or only) bendor o r the tee or the downstre am end ofthecurved orconic al port ion Ilf the redO Olilror the expander.

NOTE2 Mo&t Of the bend s on which th e lengths In this table a re based had a radius 01cu rvature equal 10 1 . 5 LJ .

a S is th e se para tion b e tween the t wo ben ds m easured from the downstream endof thecU rYedportion Of tne upstream b end tothe ups tream end ofthe tUMId portion o f the down8tr ~ '4mbend.b This is l10t a good upstre am I ns!aflal lon; a f low 'co ndltto ner sho uld be use d whe re pe ssl ble .c Too Ins tallatlon or ther mometer pod