Continuous Slot Pvc Well Screen
Posted By admin On 18.06.20STAINLESS STEEL SCREENS
These characteristics are best met in commercial continuous-slot (wire wrap) screens consisting of a triangular-shaped wire wrapped around an array of rods (see Footnote #1). If these screens are available, conduct a sieve analysis on samples on the water-bearing formation and select a slot size which will retain 40-60 percent of the material. Choose a slot configuration of slotted PVC Screen.125' 11 1' A. Rows of Slots EXAMPLE 6 2' B. Slot Length 4' SCH 40 with 4 rows of.010' wide slots on 90 degree. Pvc Water Well Screen, Find Complete Details about Pvc Water Well Screen,Johnson Stainless Steel Water Well Screen,Stainless Steel Water Well Screen,Wire Wrapped Continuous Slot Water Well Screen from Filter Meshes Supplier or Manufacturer-Hengying Wire Cloth Co., Ltd.
Well screens (filtering devices) are attached to the bottom of the casing, allowing water to move through the well, while keeping out most gravel and sand. The most popular filtering devices for water wells are continuous slot (wire-wrapped) screens and perforated liners. Continuous slot screens are usually made of wire wrapped around a series of vertical rods. Perforated liners feature slots or holes cut or drilled into steel or plastic casing at set distance. Pipeless well screen designed for effective downhole sand control with minimum pressure drop. It provides maximum inlet area and has more open area per foot of screen length than any other all welded screen design. The screens high collapse and tensile strength coupled with a competitive cost structure make it a superior alternative to slotted casing. It is versatile and adapts to many types of applications. The screens are custom built using different combinations of support rods and V-shaped profile wire to meet specific well conditions.
6' X 5' SS WRBE SCREEN | 8' X 5' SS WRBE SCREEN | 8' X 6' PS FIG. 'K' PACKER |
8' X 6' TEL. FIG. 'K' PACKER | 6'FIG K PACKER-MID-HD-OS'T' | 6' DBLE FIG K PACKER X 8'N' |
6-1/8' DBL FIG K PACKER X 12'G' | 6' FIGURE 'K' PACKER - WO | 6' & 8' BAIL BOTTOM - WO |
8' FIGURE 'K' PACKER (.250 WALL PIPE) | 8' FIGURE 'K' PACKER (.322 WALL PIPE) | 6' & 8' PLATE BOTTOM - WO |
Timoshenko’s Formula, shown below, is commonly accepted to be the most accurate method available for estimating the collapse strength of steel pipe with diameter/thickness ratios common to those used in the construction of water wells.
Where: Pcr = Theoretical collapse strength of a perfectly round tube
Where: Pe = Collapse pressure with ellipticity (psi)
E = Young’s Modulus for Steel (3×107)
u = Poisson’s Ratio (0.3)
Do = Outside diameter of casing (inches)
t = Wall thickness (inches)
S = Yield strength (mild steel = 35,000 psi)
e = ellipticity, frequently assumed as 0.01
Shutter Screen, sometimes referred to as Louver Screen, actually has a greater collapse strength than casing of the same diameter and wall thickness due to the corrugating effect of the louvers. As a result, shutter screen’s collapse strength is up to 60% stronger than the pipe from which it was made.
Factors which determine the extent of increased strength include: the thickness/diameter ratio, slot size, slot length, and number of perforations. Modifications of the formula above can provide an estimate for the collapse strength of shutter screen.
Ps = Pe 1.20 Pf = Pe 1.35 Psf = Pe 1.60
Where: Pe = Collapse pressure with ellipticity (psi)
Ps = Collapse pressure of Standard shutter screen (psi)
Pf = Collapse pressure of Ful Flo shutter screen (psi)
Psf = Collapse pressure of Super Flo shutter screen (psi)
Collapse strength of continuous slot screen is dependent on diameter of the screen, size, shape, and material type of wire used in its manufacture, and the slot size. The following formula can be used to estimate the collapse strength of continuous slot screen.
Where: I = Moment of Inertia (in)4
Where: Pcs = Collapse pressure of continuous slot screen (psi)
E = Young’s Modulus for Steel (3×107)
w = Width of wire on external face (inches)
s = Slot width of screen (inches)
D = Mean diameter of the screen (inches)
h = Wire height (inches)
b = Width of minor base of wire (inches)
The following is the ASTM F 480 formula for determining the collapse strength of PVC pipe manufactured in accordance with said standards.
Where: Pc = Collapse pressure of PVC pipe (psi)
E = Young’s Modulus for PVC (4×105)
u = Poisson’s Ratio (0.33)
Do = Outside diameter of pipe (inches)
t = Wall thickness (inches)
Another formula used to determine the collapse strength of PVC is shown below. This formula, is more conservative than the ASTM formula. However, since most PVC materials are made to minimum allowable wall thickness rather than nominal sizes, it may provide a more accurate estimate of actual collapse strength.
Physical properties of PVC vary with temperature. The values obtained with these formulas are consistent with a temperature of 70°F. As the temperature rises, PVC working strength decreases by approximately 0.5 psi per degree Fahrenheit above 70°F. Obviously, much care must be taken during cementing operations or in other high temperature environments.
Weight of a blank casing, or pipe, can be found using the following formula.
Where: W = Weight of casing (lbs/ft)
Do = Outside diameter of casing (inches)
t = Wall thickness (inches)
m = Variable for casing material: Carbon Steel = 10.68;
10 Slot Pvc Well Screen
Stainless Steel = 10.93; PVC = 2.04
Well Screens Pvc
(ignoring buoyant forces) is determined by the following formula:
Where: Yp = Yield point of casing (lbs)
S = Yield strength (mild steel = 35,000 psi)
Do = Outside diameter of casing (inches)
t = Wall thickness (inches)
= pi or 3.14159
For shutter type screen, this formula can be modified as shown here:
Where: Ysp = Yield point of slotted pipe or shutter screen (lbs)Yp = Yield point of casing (lbs) from above
l = Slot length perpendicular to the axis of the pipe (inches)
n = Number of circumferential slots
Do = Outside diameter of casing (inches)
t = Wall thickness (inches)
= pi or 3.14159
For continuous slot screen we must determine the yield point for the screen and adjust for the joint connecting the screen body to the welding ring. This establishes the “safe hanging weight” of the screen. This is accomplished with the formula shown here:
Where: Ycs = Yield point of continuous slot screen (lbs)
S = Yield strength (mild steel = 35,000 psi)
r = Radius of rods or diameter/2 (inches)
n = Number of rods
j = Joint efficiency of connection between screen and weld
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ring (generally assumed to be 0.70)
sf = Safety factor (assumed for this example at 0.5)
= pi or 3.14159
To calculate the flow in gallons per minute per foot of screen, first calculate the percentage of open area of the screen, then use that result to calculate the flow. Determine the open area for the type of screen used then convert area to a percentage. Then multiply the percentage by 12 inches per foot, by the outside diameter, by pi, and the conversion constant of 4.8:
Calculation of percent of open area:
Where: Ap = Open Area (percent%)
A = Open Area (sq.inches)
Do = Average outside diameter of screen (inches)
Calculation of open area for shutter type screen:
Where: A = Open Area (sq.inches)
l = Slot length (inches)
o = Width of slot opening (inches)
n = Number of slots per foot
Calculation of the flow in gallons per minute per foot of screen:
Where: F = Flow (gpm/ft of screen)
Ap = Open Area (percent%)
Do = Average outside diameter of screen (inches)
= pi or 3.14159
Continuous Slot Pvc Well Screen
Calculate Ap of shutter screen –
Calculation of open area for continuous slot screen:
Where: A = Open Area (sq.inches)
Continuous Pvc Heart
s = Slot size (inches)
w = Wire width (inches)
Do = Average outside diameter of screen (inches)
d = Diameter of rods (inches)
n = Number of rods
Calculation of the flow in gallons per minute per foot of screen:
Where: F = Flow (gpm/ft of screen)
Ap = Open Area (percent%)
Do = Average outside diameter of screen (inches)
= pi or 3.14159
Calculate Ap of continuous slot screen –