PowerPointPrsentation

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Level III Training Enon, Ohio June 7,
2005 NaOCl and Other Metering Applications Todd
Cranford Environmental Market Manager
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The seepex, Inc. NaOCl Pump Group D /
Range MD

• PC metering pump in standard design
• Features/benefits
• Flow range 0.06 100 gph
• hardened, wear resistant pin joints
  positively sealed
• by one EPDM elastomer sleeve
• No pulsation no dampeners required
• Can handle gas pockets however, suction
  piping design is important
• Low cost standard pump/drive packages
  available

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The seepex, Inc. NaOCL Pump Group D /
Range MD

• Materials for NaOCl Service
  B4-T4-T4-GO-GA
• Ryton seal casing
• John Crane Type 1 Seal - SC/SC Faces, EPDM
  Elastomers, Titanium Metal
• Other seals available....

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NaOCl Sodium Hypochlorite

• AKA bleach, hypo, chlorine
• Used as a disinfectant
• Corrosive
• pH 11-13
• Concentration
• Typically 12.5 in wastewater/water treatment
• Some 0.8 for on-site generated systems
• Household bleach is 5
• Manufactured by the reaction of chlorine, sodium
  hydroxide and water
• Always decomposing

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NaOCl Sodium HypochloriteDisinfection Types

• Ultraviolet
• Ozone
• Chlorination (most common)
• Gas Chlorination in decline
• Liquid Chlorination - NaOCl

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NaOCl Sodium HypochloriteDecomposition
Results in Oxygen Formation

• NaOCl is ALWAYS decomposing
• Reasons for decomposition
• Higher concentrations decompose faster
• Metals (copper, nickel, cobalt) increase rate
  decomposition
• UV Light
• If pH drops below 12, the rate of decomposition
  increases
• Decomposition rate increases as temperature
  increases
• This is a CHEMICAL reaction vapor pressure of
  NaOCl is 1.9 psia _at_ 118F

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NaOCl Sodium HypochloriteDecomposition - If
PC pumps pump air pockets, why do we care?

• Salt will crystallize on, piping, valves, seal
  faces, rotors, etc.
• If a large enough bubble forms in the suction,
  pump will run dry for too long
• Unsafe pressures can develop
• Solutions
• Suction piping design keep lines short, use
  slopes, vent any high points
• Insure there is no flow protection somewhere in
  the system
• Place PRVs in the proper places
• NaOCl that sits in a pipe all weekend in Alabama
  in the summer will have MUCH gas!

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NaOCl MD Sealing

• Standard Seal is single, inside - Sil Car Vs Sil
  Car, EPDM, Titanium Metal
• Eventually, salt will form on the outside of the
  faces

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NaOCl MD Sealing

• Offer a quench if crystalllization unacceptable
• Seal casing must be Titanium

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Hypo Pump Competition Piston/Diaphragm Pumps

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Hypo Pump Competition Piston/Diaphragm Pumps

• NaOCl gassing in the chamber GASLOCK
• External gas bypass systems required
• Pulsations require dampeners
• Slip and backflow in valves
• Valves routinely require maintenance salt
  crystallization
• seepex has a unique position in the market for
  NaOCl pumps!

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Hypo Pump Competition Piston/Diaphragm Pumps

• seepex design is essentially an infinite length
  piston pump
• seepex
• NaOCl gassing in the chamber GASLOCK NO!
• External gas bypass systems required NO!
• Pulsations require dampeners NO!
• Slip and backflow in valves NO!
• Valves routinely require maintenance salt
  crystallization NO!

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Metering Application Guidelines

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Metering Application Guidelines

Body-Internals-Stator
Max Liquid Materials Seal RPM
Psi/Stg NaOCl B4-T4-GO Crane T1 400
lt75 (Sodium Hypochlorite) Q1Q1EMM Disinfection
NaOH A6-A7-RO MG-1 400 lt75 (Sodium
Hydroxide) Q1Q1EGG pH Adjustment
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Metering Application Guidelines (Cont.)

Max Liquid Materials Seal
RPM Psi/Stg NaHSO3 A6-A7-F9 MG-1 300
lt30 (Sodium Bisulphite) Q1Q1PGG Dechlorinat
ion MgOH A6-A7-FO MG-1 300
lt50 (Magnesium Hydroxide) Q1Q1PGG pH
Adjustments
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Metering Application Guidelines (Cont.)

Max Liquid Materials Seal
RPM Psi/Stg Al2SO4 A6-A7-F9 MG-1 300
lt75 (Aluminum Sulphate, Alum) Q1Q1PGG Flocc
ulant FeCl3 B4-T4-FO MG-1 300
lt50 (Ferric Chloride) Q1Q1PMM Flocculant
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Metering Application Guidelines (Cont.)

Max Liquid Materials Seal
RPM Psi/Stg H2SO4 B4-C4-HO MG-1 300
lt75 (Sulphuric Acid) Q1Q1VMM pH
Adjustments HCl B4-C4-RO MG-1 300
lt75 (Hydrochloric Acid) Q1Q1EMM pH Adjustments
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Metering Application Guidelines (Cont.)

Max Liquid Materials Seal
RPM Psi/Stg Na2CO3 A6-A7-FO MG-1 300
lt50 (Sodium Carbonate, Soda
Ash) Q1Q1VGG pH Adjustments
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Pump Sizes

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MD / BN Pump Sizes

• MD TSE?
• 0005-24 N
• 0015-24 N
• 003-12 N
• 003-24 N
• 006-12 Y
• 006-24 Y
• 012-12 Y
• 012-24 Y BN Halar Coating?
• 025-6L Y 025-12 Y
• 025-12T N 025-24 N
• 05-6LT N 05-12 Y
• 1-6L Y

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Polymer Pumping

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Group D / Range MDP

• PC Metering Pump with one-piece rotating
  unit
• Features/benefits
• one-piece, jointless and wear-resistant
  plastic rotating unit (patent pending)
• very economical and reliable alternative
  to range MD with 10-piece rotating unit
• wetted casing parts in stainless steel or
  plastic
• threaded connections in acc. to NPT
• shaft sealing by means of mechanical seal
  (standard) or
• cartridge type lip seal (option)

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Group D / Range MDP

• Use only on well lubricating liquids

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End