MTZ 540AF Specially designed for the pulp & paper industry applications: Black liquor Red Liquor Paper Stock
MTZ 540AF Stuffing Box Pressure: up to 2 BAR. (37 psi) P.H: 0-14 Temperature: up to 120˚c (248 ˚F) Max speed: 9 m/s (30 f/s) Max run out: ~0.05 mm at stuffing box face (0.002) Dimensions: comes in imperial and metric sizes Depending on size and operating conditions Stuffing Box Pressure: up to 2 BAR. (37 psi) P.H: 0-14 Temperature: up to 120˚c (248 ˚F) Max speed: 9 m/s (30 f/s) Max run out: ~0.05 mm at stuffing box face (0.002) Dimensions: comes in imperial and metric sizes Depending on size and operating conditions Metal Parts: 304 SST – standard Hastelloy, Monel, Alloy 20 and specials by demand Secondary Seals: NBR Viton ® or equal Kalrez ® or equal Sealing Rings: Graphite based PTFE based Kevlar based Sealant: Graphite based PTFE based Metal Parts: 304 SST – standard Hastelloy, Monel, Alloy 20 and specials by demand Secondary Seals: NBR Viton ® or equal Kalrez ® or equal Sealing Rings: Graphite based PTFE based Kevlar based Sealant: Graphite based PTFE based
MTZ 540AF Main advantages: Does not require water flush – low energy cost A typical mill has 2000+ pumps. So 2000 x 5 = 10,000 GPM of water just to flush and cool stuffing boxes on pumps. Tamar MTZ is at 2000 x 0.2 = 400 GPM. Quite a difference! Uninfluenced by closed suction / discharge No fragile faces – no sudden shut-down Visual indication for preventive maintenance with optional seal call On line maintenance (quarterly-semi annually) low cost refurbish
MTZ 540AF Seal appearance Booster Connection 1/2" NPT Cooling water input/output Not distinguished The cooling water connections are 1/4" NPT. Air flush connection The air flush connections are 1/4" NPT.
Main components 1 1 2 2 3 3 4 4 5 5 8 8 10 11 1.Shaft Sleeve - Protection of the shaft 2.Collar - Insures rotation of the sleeve 3.PTFE temporary spacer 4.Collar O-ring- static sealing between collar and sleeve 5.Cooling jacket O-ring for closed circuit circulation –gland 6.Cooling Jacket - Complete separation between cooling water and process 7.Pressure Diverter - Divides one injection point to two balanced points 8.Gland - Main connection to the pump 9.Gland O-ring between the stuffing box and the gland 10.Air flush ring 11.Sleeve O-ring seals between the sleeve and the shaft 12.PTFE temporary spacer 13.Shaft Sleeve bushing – allows ANSI pumps shaft travel 14.Feeding tube & O-ring - Allows sealant injection threw the cooling water 15.Sealing rings 6 6 7 7 9 9 12 14 15
MTZ 540 AF Structure advantages 1. Crenellated sleeve2. Balanced axial injection 3. Sliding bearing structure 4. Sealing components rotation stopper 5. Closed circuit cooling 7. Threw cooling sealant injection 8. Active collar 6. Complete Separation by air flush
Operation Principle Air flushed into the seal provides a complete phase separation between the process and the sealant The sealant along with the MTZ known booster acts to minimize flushed air discharge to the atmosphere Cooling water is circulated in a closed jacket and does not mix with the process The amount of flushed air is typically 10 l/min Cooling water flow rate is typically 10 l/min Booster pressure in typically 2.5 Bar
Air Flush Ring Air flush Path to atmospheric side Air flush inlet Positive air pressure bubble chamber Air flush Path to process side
The MTZ 540 seal comes complete with a control panel that has all the necessary instrumentation to operate the seal as shown below MTZ Control Panel Index 1Air regulator 2Water tap connection 3Air flow meter 4Pressure gage 1-4 5Pressure gage 1-10 1 53 2 Tube 3/8 to Booster Water Line for cooling system 4 Tube 3/8 to Air Flush
Applications: Centrifugal pump With expellers ANSI pumps Successfully installed in USA pulp and paper plants: Evergreen, PCA, Finch Paper and more.
What will be my operating parameters? Max working capabilities S.Box PressureVelocityTempRun-outPH 40 PSI25 ft/sec248 F0.002 in0-14 Specific parameters S. Box PressureAir consumption Low viscosity process (graphite sealant) High viscosity process (PTFE based sealant) Shaft Dia 1.5"-2.5" Shaft Dia 2.5"-4" Shaft up to 2.5"2.5" & upShaft up to 2.5"2.5" & up Max 5 Liter/Min Max 10 Liter/Min Max 15 Liter/Min 60Per application 60 PSI - Zero emitionPer application
The normal attritions should be very small, about 6cc in a year. There are two main reason for fast attrition: 1. Over compression – The extra material will find its way out of the seal, mainly to the atmosphere 2. Run-out more than expected – Sealant can slip to the process and some leakage can be detected. If the run out was short, the seal can recover itself by the reservoir sealant Whats the Attrition Rate of Sealing Material?
The normal clearance is equal to mechanical seal – about 0.05mm, but for short time the seal can hold run outs of about 0.1mm What is the maximum clearances the seal can take?
No, the seal is designed for ANSI pumps and can plug and play to most pumps. Do we need to change the pump for this seal?
We can supply a small compressor. We Dont Have Air Available Where the Pump is Located. What Do We Do Now?
We can supply a small water cooling system. We Dont Have cooling tower, What Do We Do Now?
The amount of the sealant is about 50gr, MTZ designed to direct the extra sealant to the atmosphere side, so it is not likely that sealant will get into your process. In the HL (High Speed) we are using in most of the cases a graphite sealant and in food approval application we are using a food approved sealant (PTFE + other food approval materials). What If This Stuff Gets into My Process Liquid and into My System?
The pressure depends on many factors: shaft size, speed, shaft deflection, run outs, heat, process viscosity, etc. In water process and usual condition the S.B pressure can reach up to 2 bars in small pumps and 1 bar in medium pumps How High a Pressure Can I Seal?
The installation is very simple, it is cartridge plug and play system, please review the installation sheet. It Looks Like Installation Can Be Prone to Human Error
When using Graphite the seal can work in 194 degree F using cooling water. We do not have experience yet but theoretically it can work around 482 F when using cooling oil or steam What Temperature Can This Seal Handle?
The seal creates about 0.5KW The cooling system can deal with about 1.5KW How much heat the seal creates
The seal can work hours without the air pressure, in time, a leakage will happen. Connecting the air pressure will reactivate the seal and the leakage will stop. What Happens If I Lose Air Pressure?
There are several cases that the seal will fail: 1. Working without air pressure - opening the air and the seal will reactivate 2. Working without cooling water– the temperature will rise, it can damage the seal. 3. Run out more than expected – when the run out will return to normal the seal will return to normal operation 4. Wear out of the sleeve When This Thing Fails, How Does It Happen?
It depends on many factors but in general it should hold about 2 years till the user will need to replace it. In that time regular maintenance should be done. What Mean Time Between Repair (MTBR) Can I Expect?
The cost is about like other mechanical seals Most likely about 800 – 1000 $/inch shaft size What Does This Thing Cost?
We agree! Our product is definitely not Injectable packing! Its a cooled, constant pressure controlling system. It is scientifically based and its well proven solution. The seal is a cartridge, plug & play unit. Weve Used Injectable Packing Before – It Stinks!