Endress+Hauser Proservo NMS81 Technical Information page 35

Proservo NMS81
Endress+Hauser
D Dimension D Dimension
1 1x
(Example)
Example
50.9 mm
(2.00 in)
Example: L = 1 000 mm, L
1
Lower diameter of stilling well
The dimension of D has to be the larger value of the dimensions D
2
See the table below.
Concentric pipe
D Dimension D Dimension
2 2x
(Example)
Example
>100.9 mm 68.1 mm
(3.97 in) (2.68 in)
100.9 mm
(3.97 in)
Example: L = 20 000 mm, d = 50 mm, s = 5.0, 28 m drum
2
Asymmetric pipe
D Dimension D Dimension
2 2x
(Example)
Example
>84.5 mm 68.1 mm
(3.33 in) (2.68 in)
84.5 mm
(3.33 in)
Example: L = 20 000 mm, d = 50 mm, s = 5.0, 28 m drum
2
Recommendations for NMS8x mounting with a stilling well
Follow the recommendations for mounting NMS8x with a stilling well.
• Keep the pipe connection welds smooth.
• When drilling holes into the pipe, keep the interior surface of the holes clear of metal chips
and burrs.
• Coat or paint the interior surface of the pipe to prevent corrosion.
• Keep the pipe as vertical as possible. Check using a plumb bob.
• Install the asymmetric pipe under the valve and align the centers of the NMS8x and the
valve.
• Set the center of the lower part of the asymmetric pipe in the direction of the lateral motion.
• Observe the recommendations as per API MPMS chapter 3.1B.
• Confirm grounding between NMS8x and the tank nozzle.
Description
Parameter
D D dimension when the
1c 1
displacer is at the bottom of the
stilling well
D D dimension when the radial
1d 1
direction offset is considered.
This calculation is used only
with the 47 m (154.20 ft) wire
drum (G1 in Feature110) and
55 m (180.45 ft) (H1 in feature
110)
= 20 000 mm, d = 50 mm, s = 5.0, 28 m drum
2
Description
Parameter
D Calculated D value
1 1
D D dimension when the displacer is
2b 2
in L length
2
Description
Parameter
D Calculated D value
1 1
D D dimension that the displacer can
2b 2
pass through (nth groove)
Formula
= 2 x ( |p (L )|+ s)
2
= 2 x (d/2 + r + s)
and D .
1 2b
Formula
= 2 x (|p (L )| + d/2 + s)
2
Formula
= |p (L )| + d/2 + s + D
2
/2
1
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