Soap Layer Detection System II - Technical Paper

S L D S I I - SOAP L A Y E R D E T E C T I O N S Y S T E MThis graph from an actual installation shows the inaccurate traditional hydrostatic level transmitter versus the actualinterface and soap surface levels measured by the SLDS IISLDS II installation showing leveltransmitters and tank nozzleA . H . L u n d b e r g S y st em s L t d .5 4 8 0 P a r k w o o d W a yR i c h m o n d , B . C .V 6 V 2 M 4 C a n a d aP h : ( 6 0 4 ) -2 7 3 -5204 Fx : (604 )-273-723 1E-m ai l : s a l e s @ a h l u n d b e r g .c o mW e b : w w w . a h l u n d b e r g. c o mE u r o p e a n S a l e s Representa t iveS c i T e c h S e r v i c e O y L t d .Tikk alant ie 2 , P . O . B o x 1 4 2 R a u m a , F i n l a n d , F I N - 2 6 1 0 1P h : + 3 5 8 - 2 - 5 4 9 2 1 0 0 F x : + 3 5 8 - 2 -5 4 9 2 1 2 1E-m ai l : ka r i . kova s i n @ s c i t e c h s e rv i c e . c o mW e b : w w w . s c i t e c h se r v i c e .c o mA . H . L u n d b e r g A s s o c i a t e s , I n c .1 3 2 0 1 B e l - R e d R o a dB e l l e v u e , W a s h i n g t o n9 8 0 0 5 - 2 3 2 6 U S AP h : ( 4 2 5 ) -2 8 3 - 5 0 7 0 F x : ( 4 2 5 )- 2 8 3 - 5 0 8 1E-m ai l : s a l e s @ l u n d b e r g a s s oc i a t e s .c o mW e b : w w w . l u n d b e r g a ss o c i a t e s .c o mA.H . Lundberg Syste m’s SLDS II was deve loped for use in the Kraf t pu lp ing recovery process wheresoap and l iquor separate . Knowing where the in ter face between soap and l iquor as well as the soaplayer th ickness has alwa ys been a prob lem. The SLDS II Leve l System acc urate ly prov idescont inuous mea surem ents o f the soap layer th ickness. The system is modular in des ign, availa blein a se lect ion o f e lec t ron ics hous ing s ty les and sensor hose measurement lengths. SYSTEM BENEFITS• Reduce operator a t tent ion o f tank leve ls .• Can prevent s lugs o f soap f rom enter ing downst ream equipm ent.• Increased Evaporator e f f ic iency in pu lp ing appl ications.• Reduce env i ronmenta l spill hazards.• Improved Tall O i l quali ty con trol.• Low ins ta lled cap i ta l costs .• Low maintenance costs .EQUIPMENT BENEFITS• Does not require re-ca l ibra t ion over t ime.• Only needs one opening on the top o f the tank .• Longest measurement range f loat in ter face detector on the mar ket.• Easy commiss ion ing via PC based sof tware.• Measurement in processes that have low dielec tric proper t ies .• Operates in very harsh process condi t ions.S L D S I I - SOAP L A Y E R D E T E C T I O N S Y S T E MInterface Flush ArrangementInterface FloatPRINCIPLE OF OPERATIONInterface Transmit ter - L iquor/Soap Interface Level Measurement The in ter face leve l t ransmi t ter senses the pos i t ion o f an externa l f loat located a t the inter face bymeasur ing the changing res is tor a t tenuat ion s igna l ins ide o f the sensor hose which passes throughthe f loat assemb ly. T he e lec t ron ics mounted on top conve rts the changing res is tor a t tenuat ions igna l to a 4 to 20 m A leve l sign al. The sensor e lement and e lec t ron ics hous ing may be removedf rom the sensor hose wi thout d is turb ing the process. The in ter face t ransmi t ter is f lange mountedon the top o f the tank and the sensor hose ins ide is kept taut us ing a suspended anchor a t tachedto the bot tom end of the sensor hose. The f loat ass em bly is 16"(400mm) in d iameter and has beendes igned to f lo at only a t the l iquor/soap in ter face. Depending on the ins ta lla t ion, the in ter facet ransmi t ter can be ins ta lled while the process is runn ing. Built into the in ter face t ransmi t ter f langeis a l iquor f lush connect ion which a l lows the flexib le hose sur face to be c leaned perio dica lly. Set-up, ca l ib rat ion and d iagnost ics are availa ble f rom any po in t on the 4-20 m A loop us ing standardHART proto col.Microwave Radar Transmit ter - Soap Layer Surface Level MeasurementThe Microwave radar t ransmi t ter is a downward po in t ing measur ing system, based on the t ime-of-f l ight method. I t measures the d is tance between the f lange connect ion and the top o f the soap layer.Radar impulses are emi t ted by the horn antenna, re f lec ted of f the soap layer sur face and rece ivedaga in by the radar system. The re f lec ted radar impulses are rece ived by the horn antenna andt ransmi t ted into the e lec t ron ics . A microprocessor eva luates the s igna l and ident if ies the echo leve lcaused by the re f lec tion o f the radar impulse a t the soap layer sur face. From th is , a 4 to 2 0m A leve ls igna l is generated. Set -up, ca l ib rat ion and d iagnost ics are availa ble f rom any po in t on the 4-20 m Aloop us ing standard HART proto col.S L D S I I - SOAP L A Y E R D E T E C T I O N S Y S T E MSPECIFICATIONSI n t e r f a c e T r a n s m i t t e rMeasured Variable: Liquor/Soap Interface LevelElectronics Ambient Operating Temperature: -40/F to 185/F (-40/C to 85/C)Sensor Operating Temperature: -40/F to 300/F (-40/C to 150/C)Measurement Accuracy: +/-1.5 inch / (+/- 38mm)Interface Transmitter Mounting: 3" or DN80 Flange 304SSFlange Rating: 150# or PN10Sensor Hose: 304SS braided corrugated hoseInterface Float: 16"(400mm) diameter, Stainless steel, SG adjustableLiquor Flush Connection: ½" MNPT or specif ied.R a d a r T r a n s m i t t e rMeasured Variable: Soap Surface LevelElectronics Ambient Operating Temperature: -40/F to 176/F (-40/C to 80/C)Sensor Operating Temperature: -40/F to 302/F (-40/C to 150/C)Measurement Accuracy: +/- 0.2 inch (+/- 5mm)Radar Transmitter Mounting: 6" or DN150 Flange 316SSAntenna/Horn: Tef lon/6"(150mm) SS HornFlange Rating: 150# or PN10G e n e r a lLevel Measuring Range: 0 to 90 feet(27 meters)Output Signals: 4 to 20mA DC, 2-wire loop poweredSupply Voltage: 12 to 30 VDC, (I .S.)Housing: NEMA 4X, aluminum housing(radar) & 316SS(Interface)Anchor: 4"(100mm) x 5"(125mm)Set-up Communication: HART communication hardware & softwareApprovals: Intrinsically Safe - Class I, I I , I I I , Div. 1 Groups A-D - CSA I I 2GD EEx bi I IC - CENELEC/ATEX Class I, I I , I I I , Div. 1 Groups A-G - FMR TYPICAL INSTALLATION