W ed ed g e W i r e Sc S c r e e n P r o d u ct ct s
A w e d g e w i r e sc sc r ee e e n f a b r i ca cat i n g p o w e r h o u s e i n L a t i n A m e r i c a With fabrication plants in Argentina (1958), Chile (1994), and Brazil (2007), Nahuelco is the lea ding w edg e w ir iree screen screen fa bri bricato cato r in in La La tin Americ Americaa a nd is rapidly becoming a recog rec og ni nized zed w orl orldw dw ide suppl uppliier of eng ineered w edg e w ire sc screen products. products.
Buenos Aires - Argentina
Sant iag o - Chi Chile le
São Paulo - Brazil
Sta tete-ofof-thethe-art art producti production on eq ui uipment, pment, a soli olid d eng ineeri neering ng tradition a nd a strong qua lity commitment combi combine ne w ith regional fa bri briccat ion cos costs ts to make Nahuelco Nahuelco an at tracti tractive ve sourc ourcee of w edg e w ire sc screen products products for a g row ing number of custome custome rs around the globe. From sta nd ard sta inl inless ess stee l nozzles to comp lex pet rochemic rochemicaa l rea rea ctor interna ls fa bric bricat at ed in exotic alloys, alloys, Nah Nah uelc uelco o is a relia relia ble ad dition to the interna tiona l we dg e w ir iree screen screen prod ucts vend vend ors lis list. t.
N a h u e l co d esi g n s a n d b u i l d s scr e en s t o a p p l i cat i o n r eq u i r e m en t s Nahuelco Wedge Wire Screens are made of metallic wedge shaped profile wires that are welded onto support b ars at every contact point, creating consistently precise slot openings that enlarge in the intended fluid o r particle flow direction. Prof ile w ires, suppo rt ba rs an d construction ma terials fo r a specific screen a re selected a ccording to the ir physical an d chemical pro perties as w ell as their w elda bility. Flexibility in design and production enables fabrication of produ cts tha t m eet our custo mers' specific needs.
Precise slot openings accurately limit the size of particles admitted through the screen surface while the wedge wire de sig n a llow s sma ller pa rticles only tw o po ints of conta ct, g reat ly reducing the possibilities of plugg ing a nd blinding . A large o pen area for any g iven slot o pening is an a dde d fea ture de riving f rom the a mple selection of sha ped w ires produ ced at Na huelco's ow n w ire shaping mills.
Widely used in f iltra tion a pplica tion s such a s solid/fluid sepa rat ion a nd a s media support/retent ion de vice, Na huelco Wedg e Wire Screens are know n fo r their streng th, leng th o f service life a nd a pplicat ion versat ility.
N a h u el o w e d g e w i r e s cr e en f e at u r e s Precise slot o pen ings from micron s to millimet ers Large open area s allow high flow s and reduced pressure drops Robust, self-supporting structures Can b e d esig ned to resist corrosion, tem perat ure, pressure, and loads Non-blinding Long life cycle, minimum ma inte na nce
D ef i n i n g e l em en t s o f a N a h u el co W e d g e W i r e Scr e en
D ef i n i n g e l em en t s o f a N a h u el co W e d g e W i r e Scr e en A N Y SCREEN M aterial of constru ct ion, if kn ow n.
Screen constructi on, if know n; if
If u nkno w n, chemi cal and physical
unknow n, relevant in t ervening fo rces
operat ing condit ion s of screen
w hich the screen w ill be subj ect ed to . If t here are no relevant f orces(* ),
Most commo n ma terials of construction: 304 a nd 316 Sta inless Ste els Othe r freq uent ma terials: 321 and 347 Sta inless Stee ls
screen constructi on m ay be def ined j o i n t l y b y sl o t o p en i n g , o p en ar ea ,
Othe r ma terials: Titan ium, Super Duplex, o the r
and availabl e screen f abricat ing
alloys.
tooling.
Sl o t o p en i n g , i f k n o w n ; i f u n k n o w n ,
Screen Constr uctio n is defi ned by:
size of larg est adm issib le part icle
Selection from a vaila ble list of pro file wires (see
through screen
p a g e 1 8)
Selection from a vaila ble list of support ba rs (see p a g e 1 8)
Very fine: Un der 100 microns – Only ava ilab le w ith
Weldability betw een selected profile w ire a nd
the smaller range of profile wires. Open area
support bar
become s key factor (see graph pa ge 19)
Desirab le support ba r pitch (choices limited by
Fine: 100 microns an d la rge r – Choice of p rof ile w ires
available tooling)
extends to full range for slot openings 500 microns
Additional structural elements defined by
and larger
application requirements (ma y be informed w ith custome r's draw ing or d efined by Nahuelco's
Open Area as % of screen surf ace (OA% ),
Eng ineering sta ff)
i f k n o w n ; i f u n k n o w n , r eq u i r ed f l o w t hroug h a unit of screen surf ace and maximum/minimum pressure drop
Also available f or signif icant orders: Custom design of profile w ire, support b ar, and ba r pitch
FLAT SCREEN
Slot Opening
Dimensions, sta nda rd leng ths Sta nda rd Construction Inverted Construction Profile w ire leng th: Ma ximum 2000 mm (79” ) Support ba r leng th: Ma ximum 3000 mm (118” ) Wire Width
I n ve r t ed c on st r u ct i o n
St a n d ar d co n st r u ct i o n Wire Length
OA%=
Slot Opening x 100 Slot Op ening + Wire Width
(*) Relevant intervening forces are such as tractive, torsion, and axial loads; bending , collapse, burst, impact, et c., w hich when present may per manently damage a screen not designe d to w ithstand them.
Support Bar Length
CYL IN DRI CA L SCREEN
REROLLED
Direction of f low (ot her tha n ba ckwa sh) a n d Co n f i g u r a t i o n Standard dimensions cylindrical screens – external radial w ire Sma llest O.D. 22 mm (7/8” ) Larg est O.D. 655 mm (25 ¾ ” ) Leng ths up to 6000 mm (20 ft )
Flow out to in (FOTI)
Flow out to in (FOTI)
External radial w ire
External axial w ire
Flow in t o out (FITO)
Flow i n to out (FITO)
Flow in t o ou t (FITO)
Flow in t o out (FITO)
Upturned external radial wire
Upturned external axial wire
Internal axial wire
Internal axial wire
SCREENS OT HER TH A N CYLIN DRICA L A ND FLA T Th e s e s cr e e n s a r e
designed
to
meet
customer application requirements using Defining Elements as listed under ANY SCREEN and direction o f flow . Flow in t o out (FITO) Internal radial wire
Nozzles Nahuelco designs and fabricates st andard and custom m ade nozzles. Stand a rd NH 75 type ma de o f sta inless steel or ot her met al a lloys. Extensively used in w at er treat ment systems.
Nozzle Denom in at io n | NH 75 Fit t ing Size + typ e
3/4” NPT
Screen Diam eter (2” ) OD
50.8 m m
Screen Lengt h (1 9/16” )
40 mm
Tot al Lengt h (3 1/8” )
80 mm
Custo m ma de sta inless steel nozzles design ed according t o a pplication req uirements. Includes special designs fo r doub le f low and distribution, as w ell as ot her custo m de sig ns for special process requirements.
Nozzle NH 75
Co l l ect o r s & Co l l ect o r s - D i st r i b u t o r s Collecto rs a nd Collecto rs-Distribut ors are o f similar desig n, either w ith a fishbo ne o r spider arrang ement to fit the reactor vessel. Collectors-Distributors have perforated pipes inside t he w ed ge w ire screen cylindrical lat erals to allow an even distribution of the fluid t hroug h the med ia in the vessel. Collecto rs ha ve lat erals w ithout internal pipe. Lat erals are fitted w ith t hreads or flange s for at ta chment to central pipe (fishbon e) or hub
Spider Arrangem ent
(spider). Na hue lco de sig ns Collecto rs &CollectorsDistributors ba sed on ap plication requirements an d also fa bricat es according t o custo mer's dra w ing s.
Fishbon e A rrangem ent
Lateral w /int ernal pipe
Resi n Tr ap Resin t rap s typically consist of a cylindrica l FOTI w ed g e w ire screen inside a h ou sing designed to stop resin and other undesirable particles.
Lateral
P et r o ch em i cal React o r In t er n a l s (Ra d i a l Fl o w Rea ct o r s) Radial f low petro chemi cal react ors are generally f it t ed w it h Center Pipes and ei t her Out er Basket s or Scallo ps.
Scallops
Center Pipe
Outer Basket
P et r o ch em i ca l React o r In t er n a l s (Ver t i ca l Fl o w Rea ct o r s) Verti cal f low petro chem ical react ors m a y b e f i t t e d w i t h a v ar i e t y o f w e d g e w ir e screen in t ern als, such as Scale Trap Basket s, Col lect or s/Dist ri bu t or s, Sup po rt Gri ds, Flo at in g Grids, Overl ay Grids, Outlet Collectors, and Nozzles.
Su p p o r t g r i d
Suppo rt Grid
Out let Collect or
Scal e Tr ap
Scale tr aps and Out let collecto r
B ask et s Cy l i n d r i ca l & Co n i ca l Nahuelco w edge w ire screen basket s are used in st at ic app li cat io ns such as Paper fiber purification Mineral processing Screw presses Maceration cones Filtering ba skets
And d ynam ic (cent rif uges)
M acerati on cone
appl icati ons such as Mineral processing Coa l prepara tion Cane suga r processing
Screen Cylinde r Feed
Accepts
Rejects Rotor
Paper f iber puri f icati on
Filt ering basket
M ineral p rocessing & Coal Preparat io n
Cane sugar processing
M ineral processing Cyli ndr ical Centrifuge Basket
Ro t a r y Scr een D r u m s Nahuelco r ot ary screen dru m s are w idely used in Liqu id-Soli d separatio n equip m ent. There are basically t w o t ypes of constr uction s. One pi ece all w e l d e d co n st r u ct i o n , a n d s eg m e n t e d constr uctio n in sect ion s f or ease of part s replacement in abr asive applications. Nahuelco has developed proprietary designs for
One piece construt ion w it h soli ds discharg e blad es
different a pplications such as suga r and etha nol processes, mining, w aste w at er treat ment, et c. These designs include ro ta ry drums tha t f ea ture slot op en ing s fro m 50 microns (0.002” ) to 10 mm (0.4” ), segm ented drums for standa rd sector replacements, diverse solid rem ova l system s and reinforcement s for he avy duty applications. Drum diameters and lengt hs ca n be as large a s 3 met ers (10 ft ) a nd 7 met ers (23 ft ) respectively. In a ddition to our proprieta ry and w ell-tested designs, Nahuelco fabricates rotary drums according to customer’s specific designs
On e p i e ce co n st r u t i o n w i t h o u t discharg e blades
Typi cal applicat ion s f or ro t ary dru m s include: Municipal and Industrial Waste w at er treat ment Industrial processes (gelatins, lemon juice, gluten, etc.) Fish mea l plan t sea w at er discharge Suga r cane juice/ba ga sse sepa rat ion (fine slot openings) Clarified cane juice/ba ga sse separa tion (very fine slot openings) Solids classifica tion /Mining.
Segm ented in sect ions const ruction
Fl a t Scr een P a n e l s Nahuelco flat screen panels w it h f rame o r u n d e r f r a m e a r e u se d i n m a n y appli cati ons such as malt ing house g e r m i n a t i o n a n d d r y i n g fl o o r s, v i b r a t o r screens, mi nin g, edible o il extr act ion , fl o u r d r y i n g m a ch i n e s, v e n ti l a t i o n f lo ors, f oo d pro cessin g, etc. Nahuelco also fu rn ishes f lat screen panels w i t h o u t f r a m e t o scr ee n i n g eq u i p m e n t fa b r i c ato r s ar o u n d t h e g l o b e . Flat screen panels w it hout f ram e
Germ inati on f loor screen p a n e ls w i t h u n d e r f r a m e
Fram ed f lat screen panels
Si eve Ben d Scr een s a n d Ve r y Fi n e Sl o t Scr ee n s Nahuelco sieve b end screens are used f o r L i q u i d -So l i d se p ar a t i o n i n g r a v i t y f e d st a t i c eq u i p m e n t a p p l i ca t i o n s w hereas very f ine slot screens are used f or t he same pur pose on pressure f ed equip m ent . Typ ical appli cati ons are: Siev e bend screens Text ile ind ustry Green w at ers in slaug hterhouses Plastic pellets tra nsport Pulp thickening in paper plants Woo d chips recovery
Very f in e slo t screens Corn w et m illing Starch process Fine fiber recovery in paper mills Gluten process
Typ ical Head Bar
Ci r cu l a r Scr ee n Fl o o r s Nahuelco designs circular screen fl o o r s i n se ct i o n s f o r m a n y appli cati ons, includin g Laut er tun t ype fl oors f or brew eries, yeast processing f loo rs, Kam balda t ype screens f or go ld ore p rocessin g, et c.
La u t e r t u n t y p e f l o o r
Kamb alda ty pe screen f loor
Cylindrical Screens, Fi n e a n d Ver y Fi n e Sl o t Nahuelco fabricates cylindrical screens w it h f ine slot s used t ypically f o r m e d i a r et e n t i o n f i l t e r applications, including fi lt er elem ents w i t h a l ar g e v ar i e t y o f f i t t i n g s u se d i n vessels cont aini ng i on exchange resin s, act ivat ed charcoal m edia, ant hracit e and/or sand, cat alysts, et c. Cyli ndri cal screens w it h very f ine slo t s are used as coat ed f il t er element s know n as “ candles” in beer, w ine, and o t her beverage clarifi cation pro cesses, ink s and p aint m anuf act uri ng, m ineral processes, dye filt ration , and generally f or “ p o l i sh i n g ” a n y cl e ar l i q u i d .
Candle
Nahuelco fabricates cylindrical
Ra p i d Sa n d Fi l t er N o z z l es
screens w it h f ine slot s used t ypically f o r m e d i a r et e n t i o n f i l t e r
St andard 36/24 ty pe and 120/12 ty pe
applications, includin g fi lt er elem ents
no zzles have a poly pro pyl ene nucleus
w i t h a l ar g e v ar i e t y o f f i t t i n g s u se d i n
and st em and a st ainless st eel f ilt ering
vessels con t aini ng i on exchange
surf ace. Ext ensivel y u sed i n f alse
resin s, act iv at ed charcoal m edia,
b o t t o m r a p i d sa n d f i l t e r s w i t h a i r /w a t e r
ant hr acit e and/or sand, catal ysts, et c.
backw ash as original equipm ent or replacing easily breakable all plast ic
Cyli ndri cal screens w it h very f ine
nozzles
slo t s are used as coat ed f il t er element s know n as “ candles” in beer, w ine, and ot her beverage clarifi cation pro cesses, in ks and p aint manufacturing, mineral processes, dye filt ration, and generally for “ p o l i sh i n g ” a n y cl e ar l i q u i d .
P a ssi v e W at er I n t ak es Nahuelco designs and f abri cates passiv e
I n t a k e scr e en s m a y b e f i t t e d w i t h a n a i r
w ater int ake systems for l ake, riv er, and
backw ash system and m ay be w all,
sea app li cati ons. Wat er in t akes are
floor, or buoy m ounted in either a fixed
cy l i n d r i c al scr e en s w i t h e i t h e r “ T” o r
o r r e m o v a b l e co n d i t i o n . A m o n g
st r a i g h t c o n f i g u r a t i o n t h a t a l l o w w a t e r
o p t i o n a l f e a t u r e s, a n t i - f o u l i n g d e v i ce s
t o f l o w i n w h i l e k ee p i n g m o st m a r i n e
are available. M ost com m on m aterials
l i f e an d u n d e si r e d d e b r i s f r o m e n t e r i n g
of con st ru ct io n are 316L st ainl ess st eel
t he system.
f o r f r e sh w a t e r a p p l i ca t i o n s a n d n i ck e l a l l o y s f o r s al t w a t e r a p p l i ca t i o n s . KEY INDUSTRIES. Municipal w at er treatment . Pulp and Pa per Suga r Mills Pow er Plant s – cooling systems. Othe r larg e-volume w at er users
Dr ai n 2 Sy st em f o r Rap i d W a t er San d Fi l t er Fl o w Up g r ad e Nahuelco d esign s and f abricates the DRAIN2 system f or up gradi ng rapi d sa n d f i l t e r s t o o b t a i n a v e r y h i g h f l o w p e r u n i t o f f i l t e r su r f a ce . The syst em consists of a filter f a lse b ot to m covered by w edg e w ire screen filtering element s in ha lf-pipe sha pe w ith a b uilt-in con tro lled a ir/w a te r ba ckw a sh device fo r even distribution throug h the filter media be d. The DRAIN2 syste m is id ea l fo r con version an d upg rad e of existing f ilters w here spa ce is critica l a nd h ighe r flow s a re required.
Drain2 Filt ering Elem ent
N a h u el co P r o f i l e/ Su p p o r t B a r Sp eci f i ca t i o n s N ah u e l co “ V” p r o f i l e sh a p es Prof ile Wire 20 30 43 47 50 59 63 68 69 75 80 90 93 A 10 0 100 AU 100 B 100 FR 10 9 11 4 11 8 126 WH 12 8 13 3 134 WH 14 5 15 0 15 5 15 7 17 5 19 6 20 0
Width
Height
mm
inch
mm
inch
0.5 0.76 1.10 1.20 1.27 1.50 1.55 1.75 1.80 1.90 2.00 2.25 2.28 2.54 2.54 2.54 1.20 2.85 2.90 2.95 3.20 3.05 3.40 3.00 3.70 3.80 4.00 4.00 4.40 5.00 2.00
0.020 0.030 0.043 0.047 0.050 0.059 0.061 0.069 0.071 0.075 0.079 0.089 0.090 0.100 0.100 0.100 0.047 0.112 0.114 0.116 0.126 0.120 0.134 0.118 0.146 0.150 0.157 0.157 0.173 0.197 0.079
1 1.53 2.20 2.00 2.40 4.00 2.55 4.40 4.50 2.90 4.15 3.60 3.50 4.05 5.90 5.60 2.25 4.60 5.20 4.70 6.80 5.60 6.20 8.00 7.35 6.40 6.60 8.25 6.80 8.00 3.05
0.039 0.060 0.087 0.079 0.094 0.157 0.100 0.173 0.177 0.114 0.163 0.142 0.138 0.159 0.232 0.220 0.089 0.181 0.205 0.185 0.268 0.220 0.244 0.315 0.289 0.252 0.260 0.325 0.268 0.315 0.120
Angle 11º 13º 13º 13º 13º 6º 13º 5º 7º 13º 8º 13º 4º 13º 8º 4º 10º 13º 13º 13º 4° /12° 13º 13º 4° /12° 11º 13º 13º 10º 13º 13º 13º
Area mm
2
0.31 0.68 1.46 1.61 1.86 4.44 2.63 6.02 5.90 3.90 6.07 5.49 6.87 6.93 10.28 11.78 1.88 8.66 9.33 9.42 16.30 10.75 12.84 18.59 17.49 15.62 17.12 22.10 20.15 25.98 4.15
Weight
sq inch
gr/m
lb/ft
0.00078 0.00180 0.00375 0.00372 0.00472 0.00930 0.00613 0.01194 0.01256 0.00854 0.01287 0.01256 0.01237 0.01594 0.02323 0.02205 0.00419 0.02032 0.02337 0.02149 0.03373 0.02647 0.03267 0.03720 0.04215 0.03770 0.04092 0.05115 0.04638 0.06200 0.00946
2.5 5.4 11.6 12.9 14.9 35.5 21.0 48.2 47.2 31.2 48.6 43.9 55.0 55.4 82.2 94.2 15.0 69.3 74.6 75.4 130.4 86.0 102.7 148.7 139.9 125.0 137.0 176.8 161.2 207.8 33.2
0.0017 0.0036 0.0078 0.0086 0.0100 0.0239 0.0141 0.0324 0.0317 0.0210 0.0326 0.0295 0.0369 0.0373 0.0553 0.0633 0.0101 0.0466 0.0502 0.0507 0.0877 0.0578 0.0691 0.1000 0.0941 0.0840 0.0921 0.1188 0.1084 0.1397 0.0223
Nahuelco Sup po rt Bar Shapes Support Bar M NR 63 N 20 90 M JR PNR XJR N 30 BNR SNR XNR
Width
Height
Area 2
mm
inch
mm
inch
mm
1.30 1.55 2.00 2.25 2.00 2.00 2.25 3.00 2.70 3.00 3.30
0.051 0.061 0.079 0.089 0.079 0.079 0.089 0.118 0.106 0.118 0.130
3.10 2.55 3.00 3.60 4.20 9.50 4.80 5.00 5.70 6.00 10.00
0.122 0.100 0.118 0.142 0.165 0.374 0.189 0.197 0.224 0.236 0.394
3.39 2.63 4.50 5.49 6.88 17.48 8.65 11.63 12.45 14.97 29.47
Weight
sq inch
gr/m
lb/ft
0.00525 0.00408 0.00698 0.00851 0.01066 0.02709 0.01341 0.01802 0.01930 0.02321 0.04568
27.1 21.0 36.0 43.9 55.0 139.8 69.2 93.0 99.6 119.8 235.8
0.0182 0.0141 0.0242 0.0295 0.0370 0.0940 0.0465 0.0625 0.0670 0.0805 0.1585
NOTES: 1) All dimensions are nominal. 2) The mo st commo n shapes a re show n. Other shape s ava ilab le upon req uest. 3) Variat ions on t he choice of profiles and support bars depend on the w eldability of the chosen combination. When in do ubt, please consult NAHUELCO.
P er cen t ag e o f Op en A r ea f o r N a h u e l co Scr een s 70
Wire 20 Wire 30 Wire 43 Wire 47 Wire 100FR
60
Wire 50 Wire 59 Wire 63 Wire 68
A E R A N E P O F O E G A T N E C R E P
Wire 69
50
Wire 75 Wire 80 Wire 200 Wire 90 Wire 93A
40
Wire 100 Wire 100AU Wire 100B Wire109 Wire 114
30
Wire 118 Wire 126WH
%OA I N SLOTS SM ALLER THAN 0.30 m m (0.012” )
Wire 128 Wire 133
SLOT OPENING mm
20
REF
0.05
0.10
0.15
0.20
Wire 134WH
0.25
Wire 145
0.30
Wire 150
inches 20 30 43 47 50 59 63
10
0.001960
0 .0 03 94
0 .0 05 9
0 .0 07 8
0 .0 09 8
0 .0 12
Wire 155
9.09 6.17 4.35 4.00 3.78 ---
16.67 11.63 8.33 7.69 7.30 6.25 6.06
23.08 16.48 12.00 11.11 10.56 9.09 8.82
28.57 20.83 15.38 14.28 13.61 11.76 11.43
33.33 24.75 18.52 17.24 16.45 14.29 13.89
37.50 28.30 21.43 20.00 19.11 16.66 16.22
Wire 157 Wire 175 Wire 196
0 0
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
SLOT OPENING
Slot opening
Nahuelco Rou nd an d Flat Sup po rt Bars Sta nda rd round ba rs are a vailab le in diamet ers from 2 mm (0.078” ) to 6.7 mm (0.264” ).
Profile Height
Angle
Sta nda rd flat ba rs are a vailab le in w idths from 2 mm (0.078” ) to 6 mm (0.236” ), an d h eight s from 9.5 mm (0.375” ) to 38mm (1.5” ). Support Bar Height
Profile Width
NAHUELCO p ro d u ct s are ex p o r t ed t o t h e f i v e co n t i n en t s Over 100 expo rt sales per year
w w w . n a h u e l c o . co m
ARGENTINA
BRAZIL
CHILE
NA HUELCO S.A .
WW FILTROS LTDA
NA HUELCO S.A .
Perdriel 3810 (B1646GMB) - Sa n Ferna nd o Buenos Aires, Argentina Tel + 54-11 4714-6699 Fa x + 54-11 4714-2175 Ema il info @nahu elco.com
Rua Oneda 439, Planalto São Berna rdo do Campo São Pa ulo, Brasil CEP 09895-280 Tel + 55 11 4341-5777 Fax + 55 11 4393-0414 Ema il info@w w filtros.com.b r
Caña vera l 051-A Quilicura Sa ntia go , Chile Tel + 56 2 4435144 Fa x + 56 2 4435109 Ema il info @nahu elco.com
AGENT / DISTRIBUTOR:
Revised 08/2007 and subject to future revisions
