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PETRONAS TECHNICAL STANDARDS
DESIGN AND ENGINEERING PRACTICE
MANUAL (SM)
DESIGN AND REQUISITIONING OF
SCHOPENTOETER (VANE-TYPE)
INLET DEVICES (TYPES I TO IV)
PTS 20.058
AUGUST 1986
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PREFACE
PETRONAS Technical Standards (PTS) publications reflect the views, at the time of publication,
of PETRONAS OPUs/Divisions.
They are based on the experience acquired during the involvement with the design, construction,
operation and maintenance of processing units and facilities. Where appropriate they are based
on, or reference is made to, national and international standards and codes of practice.
The objective is to set the recommended standard for good technical practice to be applied by
PETRONAS' OPUs in oil and gas production facilities, refineries, gas processing plants, chemical
plants, marketing facilities or any other such facility, and thereby to achieve maximum technical
and economic benefit from standardisation.
The information set forth in these publications is provided to users for their consideration and
decision to implement. This is of particular importance where PTS may not cover every
requirement or diversity of condition at each locality. The system of PTS is expected to be
sufficiently flexible to allow individual operating units to adapt the information set forth in PTS to
their own environment and requirements.
When Contractors or Manufacturers/Suppliers use PTS they shall be solely responsible for the
quality of work and the attainment of the required design and engineering standards. In
particular, for those requirements not specifically covered, the Principal will expect them to follow
those design and engineering practices which will achieve the same level of integrity as reflected
in the PTS. If in doubt, the Contractor or Manufacturer/Supplier shall, without detracting from his
own responsibility, consult the Principal or its technical advisor.
The right to use PTS rests with three categories of users :
1)
2)
3)
PETRONAS and its affiliates.
Other parties who are authorised to use PTS subject to appropriate contractual
arrangements.
Contractors/subcontractors and Manufacturers/Suppliers under a contract with
users referred to under 1) and 2) which requires that tenders for projects,
materials supplied or - generally - work performed on behalf of the said users
comply with the relevant standards.
Subject to any particular terms and conditions as may be set forth in specific agreements with
users, PETRONAS disclaims any liability of whatsoever nature for any damage (including injury
or death) suffered by any company or person whomsoever as a result of or in connection with the
use, application or implementation of any PTS, combination of PTS or any part thereof. The
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custody and PETRONAS may at any time require information satisfactory to PETRONAS in order
to ascertain how users implement this requirement.
CONTENTS
1. Introduction
2. Design procedure of schoepentoeter
3. Requisitioning
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Reference
List of symbols
1
Figure
7
Standard Drawings
Appendix I - Non-Disclosure undertaking
1. INTRODUCTION
The Schoepentoeter (vane-type) inlet device is commonly used for introducing gas/liquid
mixtures into a vessel or column,
This memorandum provides the information for designing a Schoepentoeter and enabling the
completion of a standard requisition for the contractor or manufacturer.
A description of the application of Schoepentoeters can be found in
Ref. 1. This memorandum
replaces the design procedures given there, as various design rules have now been changed;
Standard Drawings and requisition sheets have also been updated.
The standard drawings are appended for easy reference.
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Schoepentoeters are Shell proprietary equipment. Drawings and requisitions are confidential
and shall not be released to others, unless such release is covered by a secrecy agreement.
The preferred manufacturer is METAWA TRAY BV, P.O. Box 6027, 4000 HA Tiel, the
Netherlands.
2. DESIGN PROCEDURE OF SCHOEPENTOETER (VANE-TYPE) INLET DEVICES
(TYPES I TO IV)
2.1 Introduction
A typical conventional Schoepentoeter is shown in
Fig.1 , mounted in a vertical vessel. The
geometry of the Schoepentoeter is to a large extent standardized so that the choice of
dimensions to be made by the designer is limited to the following :
a. the number of vanes per side, n
b. the vane angle,
v
D , which is 8 degree, or less
c. the lenght of the straight part of the vane, L
v , which must be 75, 100, 150, or 200
mm*. The choice of L v is also used to fix the vane spacing
d. the radius of vanes, R
v,
which must be 50 or 100mm*
With a Schoepentoeter, it is normal to specify a protruded nozzle, though this is not essential.
Constructional details are shown on Standard Drawings
been deleted)
S 20.015 to S 20.022
. (S20.018 has
2.2 Design method.
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* for special cases larger vanes with a larger vane radius may be applied
D
=
vane angle. Angle made by straight part of vanes with centre line
= edge angle. Angle made by edge of the row of vanes with centre line
D = vessel inside diameter, mm
do
= inlet nozzle outside diameter, mm
E = available space, mm
Lv
= lenght straight part of vanes (75, 100, 150 or 200mm)
nv
= number of vanes per side
Rv
= vane radius, mm(50 or 100 mm)
t = vane material thickness, mm (normally 3 mm)
w vo
= width of vane entrance opening, mm
i for a new vessel the inside diameter D and the diameter of the feed nozzle d
o
will be determined by process considerations.
o will be known
For an existing vessel, D and d
Schoepentoeters are not use in vessels of diameter less than 500mm.Apply
150 mm.
Schoepentoeters only on nozzles with d
o
In case nozzle diameters d
o >1/3 D are encountered an expert should be consulted.
ii Evaluate the available space E.
For a vertical vessel take E = D - 50 (
D
2000)
E = D - 100 (2000 < D
4000)
E = D - 200 (4000 < D
)
If the actually available space is excessive, apply a shortened
Schoepentoeter (Types II to IV) and assess the required space E.
For a horizontal vessel take E = 5 d
E 270
d o 40
iii Evaluate X =
o.
and select L
V
and R
XEL
V
2.5 550
RV
E
100 50
1000
> 1000 100 100
2.5
6<X
:
< 550 75 50
2.5
2.5 < X
V
6
> 550 100 100
20
> 550 150 100
X > 20 > 550 200 100
iv Calculate number of vanes per side n
n v = (E - R
v
- 70)/L
v
from
v
rounded down to nearest integer
v Evaluate tan
= (d o - 40) /2 (n
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v
-1) L
v
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D = 8 degrees initially (maximum value)
vi Choose
vii Evaluate W
vo
from
W vo = L v (sin + cos tan) - t mm
W vo should be within the range of
20
viii If W
vo
W vo
> 30, reduce
W vo
ix If W
x If 20
vo
W vo
to
min
W vo
max
30
D by steps of 1 degree (minimum value 0º) until
30
< 20, reduce Schoepentoeter lenght, i.e. reduce n
W
selected.
vo
30, the design is finished and n
v,
v
R v , L v and D are
2.3 Vane height
Each row of vanes in a Schoepentoeter is welded to a mounting strip at top and bottom. The
assembly, which includes a row of vanes is known as the vane ladder. It is not normal to
specify the height of the vanes, since the height will be made sufficient to cover the inlet
nozzle. However, the designer should give some consideration to the height of the vane
ladders in the following cases:
2.3.1 Schoepentoeter to enter through its own nozzle
It is common for the vane ladders to be brought separately into the column, and the device
assembled "in situ". Sometimes the ladders must be brought in through their own nozzle, for
example when this is the largest opening in the column wall. When this is to be done, the
vane ladders must be adapted, either by applying a "catcher cap" or by dividing the vane
ladder. For separator applications a "catcher cap" is not allowed, since this increases the inlet
velocity. Provision of an adequately sized manhole is preferred.
2.3.2 Vane height greater than 800 mm
Tall vanes are susceptible to vibration. Therefore if the vane height exceeds 800 mm, the
vane ladder should be divided for more stiffness.
2.3.3 Schoepentoeter subject to heavy load
There are circumstances in which the Schoepentoeter is subjected to a load heavier than one
would normally design for. Examples are Schoepentoeters fitted to existing nozzles during
revamps, or in flare system knock-out drums where in severe relief situations exceptionally
high flow rates are possible. Sometimes Schoepentoeters are required to withstand liquid
slugs. In these cases consideration should be given to a divided ladder construction.
In addition, a material thickness greater than the normal 3 mm may be specified for the
vanes.
3. REQUISITIONING
The only dimensions to be specified are the nominal nozzle size the number of vanes per side, the
length of the leading straight part of the vanes, the vane radius and the vane angle.
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It should also be specified via which manhole or nozzle the Schoepentoeter has to be installed.
The design parameters can be completed on the data/ requisition sheet for Schoepentoeters.
Since the requisition makes reference to the relevant standard drawings, it is not necessary to include
the drawings with the requisition. Other sketches showing vane details should not be used in
requisitioning.
The manufacturer is required to make some checks as indicated on the standard drawings.
Standard Drawing
Standard Drawing
Standard Drawings
IV.
S.20.020 attached shows the most commonly applied Schoepentoeter and
S 20.019 shows typical vane ladder details.
S 20.015 / 016 / 017 / 021 / 022
show the other Schoepentoeter
types I, II, III
and
REFERENCE
1.
PTS 31.22.05.11 , February, 1982: Manual Gas/Liquid Separators.
FIGURE 1
TYPICAL DRAWING AND DETAILS OF VANE FEED INLET
(SCHOEPENTOETER CONVENTIONAL TYPE I)
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NOTE: SUPPORTS NOT SHOW IN TOP VIEW
S 20.015-A
TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET)
(TYPE II)
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S 20.016-A
TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET)
(TYPE III)
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Document Outline
• TITLE
• PREFACE
• TABLE OF CONTENTS
◦ 1. INTRODUCTION
◦ 2. DESIGN PROCEDURE
◾ 2.1 Introduction
◾ 2.2 Design method.
◾ 2.3 Vane height
◦ 3. REQUISITIONING
◦ REFERENCE
◦ FIGURE 1 TYPICAL DRAWING AND DETAILS OF VANE FEED INLET (SCHOEPENTOETER CONVENTIONAL TYPE 1)
◦ 7 STANDARD DRAWING
◾ S 20.015A: TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET) (TYPE 2)
◾ S 20.016A: TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET) (TYPE 3)
◾ S 20.017A: TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET) (TYPE 4)
◾ S 20.019C: VANE LADDER - SUPPORTS AND GENERAL NOTES
◾ S 20.020A: TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET) (TYPE 1A)
◾ S 20.021O:TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET) (TYPE 1B)
◾ S 20.022O:TYPICAL DETAILS OF SCHOEPENTOETER (VANE FEED INLET) (TYPE 1C)
◦ APPENDIX 1: NON-DISCLOSURE UNDERTAKING
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