ShockGuard
Shock Guard
 Fluid Flow Control Animations by Liquid Dynamics
ShockGuard offers shock alleviators and surge alleviators. | Please phone 44(0) 161-480-9625
We have people not voicemail. | Call toll free UK 08080-567-7423

Surge Alleviators
Surge suppressor helps prevent hazardous spills.
Pipeline surge preventor

Where to install pipe line shock and surge preventor.
Pipeline Shock, Surge, and Water Hammer Device Installation

SURGE PREVENTORS

SURGE PREVENTORS for suppressing surges in pipes with surging liquids,
are needed to suppress a surge.

Surge preventors for smoothing the surge when a pump starts;
these surge preventors are installed down stream of the discharge check valve.

Surge preventors dampen the system overpressure from a fast start-up; required
when there is no flow back bypass to suction.

Surge preventors stop the shock from quick valve closure and isolator slam;
and work best, when mounted as close to the isolating valve as possible.

Surge preventors attenuate bang from reverse flow when pumping system stops,
by being placed immediately after the delivery outlet.

Surge preventors arrest the flow gently preventing water hammer;
it is the increase in time for deceleration that counts.

Surge preventors suppress the surges from centrifugal fast motor spin-up.
when a loop back to source, with metered restriction was not provided.

Surge preventors also used for volume compensation with temperature change, by
functioning as an accumulator.

SURGE PREVENTOR

Surge preventor for leveling the surge when pumps are started;
this surge preventor is piped in, just after of the discharge check valve.

Surge preventor suppresses a surge in a pipe having liquids that are surging,
by stabilizing the mass oscillation with their cushioning.

Surge preventor stopping shocks from quick valve closure, isolator slam,
is most efficient, when positioned adjacent the isolation valve.

Surge preventor dampening system overpressure with instant start-up,
is by substituting for a flow back bypass going to source of supply.

Surge preventor attenuates hammer from reverse flow when stopping pumps;
catching the weight of the returning fluid, with progressive resistance.

Surge preventor suppresses the surge on fast motor spin-up of centrifugals,
when a metered resistance, looping back to inlet, has not been provided.

Surge preventor arresting the flow gradually, so preventing water hammer,
by prolonging the period of slow down.

Surge preventor are used for compensating volume on temperature variations,
giving excess volume somewhere to go without a large pressure increase.


Shock, Surge and Water Hammer Device Dimensional Drawings PVC or PP Polypropylene Cold Forged Elastomer Carbon Steel Process Liquid Air or N2 Nitrogen Dimensional Drawings for other devices that address shock, surge, and water hammer 316 L Stainless Steel Liquid in elastomeric bladder Air in huge sack Flow-Thru Flex-Tube Diaphragm Nitrogen in Gas Bag Flow through rolling bladder membrane PTFE Flexflon diaphragm and 316 stainless steel shell no moving parts metal membrane no diaphragm, no bladder, all metal parts ShockGuard Surge Alleviators Surge Alleviater Surge Preventer Surge Arrester Surge Absorber Surge Suppresser Surge Attenuater Surge Suppressor Surge Attenuator Surge Alleviator Surge Preventor
Accumulators, Pulsation Analysis, Surge Alleviators, and Pulsation Dampeners



ShockGuard / Pipeline Surge Prevention | Contact Information
Graphics, ocillograph plots, full data requirements, courtesy pulsation analysis and pipeline surge/shock prediction service Liquid Dynamics Int. Inc and Ltd. To stop the hammer from rapid valve closings provide a soft volume for the flow to go into, so that time is increased in which decelaration can occur Air or N2 "Pad", Bar -OR- PSI Mass Flow Kg/Sec -OR- Volume Flow plus SG Head (2+), Supply Length (3), Diameter (4) Delta P of restriction Lift (2-) Valve Opening Time after pump turn off, -OR- Pump spin down time after valve closure. Rise Centrifugal RPM Impeller Diameter Compressibility in parts of a liter per bar, pressure change. Example: Water 50e-6, 19.6e-5, 11.39e-4 Average Diameter Pipe Length Elasticity of pipe wall Steel 2e+11, Concrete 4.2e+10, PVC 2.89e + 9 Valve Closure Time Pressure resistance at end This is not pressure pulsation, the "repeat" of the pressure wave is just the time that it takes to go to the end of the pipe and reflect back. Rapid Valve Closure Hammer Valve Slams in 0.1 Secs / 100ms Graphics, ocillograph plots, full data requirements, courtesy pulsation analysis and pipeline surge/shock prediction service Liquid Dynamics Int. Inc and Ltd Lower surge pressure, from fast pump start reduce the force required to accelerate the mass in the pipe system, by providing an accumulator to enable a "soft start" Air or N2 "Pad", Bar -OR- PSI Mass Flow Kg/Sec -OR- Volume Flow and SG Head (2+), Supply Length (3), Diameter (4) Lift (2-) Delta P of restriction Viscosity cP Centrifugal Pump RPM Impeller Diameter Valve opening time after pump turn off, -OR- Pump spin down time after valve closure Rise Average Diameter Pipe Length Elasticity of pipe wall Fall Pressure resistance at end Compressibility in parts of a liter per bar, pressure change. Example: Water 50e-6, 19.6e-5, 11.39e-4 Example: Steel 2e+11, Concrete 4.2e+10, PVC 2.89+9 Again, this is not pressure pulsation. If this was pressure pulsation, then the height of each pressure peak, would be near identical. The 5Hz frequency is the signature from the length of the pipe with this compressibility of the liquid. Pump Start-Up Surge Into a pipe that is full. Graphics, ocillograph plots, full data requirements, courtesy pulsation analysis and pipeline surge/shock prediction service Liquid Dynamics Int. Inc and Ltd. Enabling Sudden Pump Shut-Down without end of Back Flow SHOCK When pump is stopped, momentum continues the flow, making a void after the pump, which causes back-flow; provide a catchment for this to prevent instant arresting form damaging the pump, valves, and pipe. Air or N2 "Pad" Bar -OR- PSI Mass Flow Kg/Sec -OR- Volume Flow from pump and SG Head (2+), Supply Length (3), Diameter (4) Centrifugal Delta P of restriction (10) Viscosity cP Lift (2-) RPM Impeller Diameter Valve Opening Time after pump turn off, -OR- Pump spin down time after valve closure Compressibility in parts of a liter per bar, pressure change. Example Water 50e-6, 19.6e-5, 11.39e-4 Pressure resistance at end Rise Average Diameter Pipe Length Elasticity of Pipe Wall Example: Steel 2e+11, Concrete 4.2e+10, PVC 2.89e+9 Shit-Down Back-Flow Bang in a 150 yard pipe momentum pulls a vacuum flows away from pump comes to a halt Accelerates back to fill the void 9.5 Seconds 1.0 Seconds The Pipe is Dissapative Dissapative is the pipe being small enough to scrub energy out of the pressure wave, and then to give it up to the atmosphere in the form of heat From this we learn that it is unwise to oversize the pipes if we need pressure stability ShockGuard Limited ShockGuard USA Suction Side These have an exponential effect Air or N2 "Pad", Bar -OR- PSI Head + Feet or Lift - Meters Supply Length Supply Diameter Delta P of any supply restrictions Valve opening time after pump turn off Pump spin down time after valve closure Fast closing block valve closure time Average Diameter Pipe Length Pressure resistance at end Elasticity of pipe wall, Ex. Steel 2e+11 Compressibility in parts of a liter per bar, change. Ex: Water 50e+6 Mass Flow Kg/Sec -OR- Volume Flow from pump & SG Viscosity cP grams/cm3 MDMT Compastible materials Metal Elastomer It is not probable that any equipment offered will be suitable for your desired purpose unless all the major parameters of your system are stated in order to enable a selection Request for quotation Guard against pulsation Guard against excess flow Analysis and Diagnostics Chemical Smooth Flow Pulsation Dampeners Surge Alleviators Flow Fuses and Breather Bags Pulsation Analysis Hydraulic Accumulators Special Pump Control Accumulators Guard against pipeline shock