Find answers to all questions with us

# What is the maximum permissible velocity for suction pipe?

## What is the maximum permissible velocity for suction pipe?

Water velocities in pipes and tubes should not exceed certain limits

Application Maximum Velocity
(m/s) (ft/s)
Process water 1.5 – 3 5 – 10
Pump discharge 1.5 – 3 5 – 10
Pump suction 0.9 – 2.4 3 – 8

### What is the ideal velocity of water through pipe?

What is a ‘good’ pipe velocity?

Fluid Typical Pipe Velocity (m/s)
Water 0.9 – 2.4
Carbon tetrachloride 1.8
Chlorine, liquid 1.5
Ethylene glycol 1.8

Which suction specific speeds are acceptable?

As a rule of thumb the Specific Suction Speed should be below 9000 (calculated with US gpm) to avoid cavitation and unstable and unreliable operations. Empirical studies indicates that safe operating ranges from Best Efficiency Points (BEP) are more narrow at higher Suction Specific Speeds.

Which velocity is considered in velocity distribution in a pipeline?

The range should be 0.75 m/s to 3 m/s. The minimum velocity should be high enough to prevent sedimentation and the high velocity should not be too high as to cause erosion of the pipeline.

## How do you calculate suction velocity?

Typical Calculation of Pump Suction Intake Design

1. A = Cross-section area of Pipe or (A=π/4 * D2)
2. V= Velocity in pump suction side (velocity in suction pipe is generally considered in range from 06 to 1.5m/s.

### How do you calculate velocity in a pipe flow?

Figure 1. Flow rate is the volume of fluid per unit time flowing past a point through the area A. Here the shaded cylinder of fluid flows past point P in a uniform pipe in time t. The volume of the cylinder is Ad and the average velocity is ¯¯¯v=d/t v ¯ = d / t so that the flow rate is Q=Ad/t=A¯¯¯v Q = Ad / t = A v ¯ .

How do you calculate pump suction velocity?

What is suction speed?

Suction specific speed is an index number for a centrifugal pump similar to discharge specific speed and is used to define its suction characteristic. It is constant for a given pump, regardless of pump speed. Higher numerical values of “S” are associated with better suction capabilities.

## What is the maximum suction pressure?

Atmospheric pressure exerts about 14.7 pounds per square inch of force on everything (you, a car, liquid) at sea level. That 14.7 psi on liquid allows it a maximum of 34 feet of head (push) at sea level.

### How to calculate the suction velocity of water?

In general-as a rule of thumb-keep the suction fluid flow speed below the following values: Pipe bore Pipe bore Water Suction Velocity Water Suction Velocity inches mm m/s ft/s 1 25 0.5 1.5 2 50 0.5 1.6 3 75 0.5 1.7

What should the pipe velocity of a pump be?

Pipe size and hence pipe velocity can have a significant effect on system performance on both the suction and discharge side of a pump. For water-like liquids with no entrained solids (for example: chemicals, petrol, beverages), a pipe velocity of about 1 – 2 m/s is considered suitable.

How big should a straight run suction pipe be?

Include a straight run pipe length equal to 5 to 10 times the pipe diameter between the pump inlet and any obstruction in the suction line. Note: Obstructions include valves, elbows, “tees”, and etc. Keeping the pump suction piping short ensures that the inlet pressure drop is as low as possible.

## How to calculate suction and discharge side velocities?

With regards the suction side line sizing of the pump, I found that having low fluid velocity will allow the solids in the fluid to settle down. In my case the fluid being pumped is a thin slurry with 12% solids in it. I calculated the terminal settling velocity as 0.10 ft/sec using the formula for Terminal settling velocity.