| Mechanical
seals according to application (pumps) |
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The
main focus of our program are mechanical seals for difficult requirements
of sealing technique, partly in special designs.
These types of CHETRA® mechanical seals are adapted
to the operating conditions as well as to the aggregate
to be sealed.
The following listed cases of application are examples,
representing a large number of applications of CHETRA® mechanical
seals. |
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Heat
transfer oils |
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Our
concept for the sealing of heat transfer oils is to work
without auxiliary cooling (up to a max. of 400°C) by means of special
double-acting tandem mechanical seals and use of quench vessels (thermosyhon). |
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| 770 |
- double-acting
/ tandem
- preassembled
cartridge mechanical seal ready for installation
- balanced
- independent
of direction of rotation
- metal
bellows
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| Dimensions: |
30-115
mm |
| pmax: |
16
bar (25 bar) |
| t: |
400°C |
| vmax: |
25
m/s |
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Operation:
Quench pressurization / thermosyhon quench
The specific design and the materials used combine to make operation of
this mechanical seal possible without expensive and often susceptible
auxiliary cooling:
- cooling fin housing, guided and optimized "cold" quench runback a.o.
measures dissipate heat and avoid cracking and the formation of oil carbon
- preferred materials: A Q2 G E4 G + A Q2 T
Other CHETRA® mechanical seals for the sealing of heat transfer oils
and other "hot products" are: 700S, 711, 775, 875T |
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LATEX/SB
Latex/A-Latex a.o.
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The
medium Latex demands more from a mechanical seal because of the inherent
characteristic features of the medium as well as its tendency to clot. |
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861
862 |
- double-acting
- preassembled
cartridge mechanical seal ready for installation
- balanced
- independent
of direction of rotation
- multiple
springs (protected on the product side)
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| Dimensions: |
50-200
mm |
| pmax: |
50
bar |
| t: |
-120°C...+315°C
(acc. to secondary seal) |
| vmax: |
35
m/s |
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Guided circulation flow, protection of sealing elements essential for
function a.o. special design features of the mechanical seal ensure reliable
operation and high service life.
Application of solid hard alloy seal faces/ secondary seats with special
seal face geometry and finish. |
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Pipeline
pumps |
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Pipeline
pumps deliver crude oil products as well as finished products. Because
of pressure ratio as well as in connection with dimensions and number
of revolutions (p.v factor) the mechanical seal must have robust design
and material and be indifferent to solid matter. |
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| 201 |
- single-acting
/ mechanical seal acc. to API 610
- preassembled
cartridge mechanical seal ready for installation
- balanced
- independent
of direction of rotation
- multiple
springs (protected)
- stationary
design
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| Dimensions: |
30-115
mm
(also in inches) |
| pmax: |
70
bar (125bar) |
| t: |
-80°C...+315°C
(acc. to secondary seal) |
| vmax: |
35
m/s |
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Operation:
API plan 11+53
Solid mechanical seal in stationary design with solid seal face/ stationary
seats for sealing of crude oil as well as refinery and petrochemical finished
products in pipeline pumps
Multipoint injection, seal face design for high p.v factor and further
constructive measures produce an operationally safe mechanical seal with
high service life (MTBR) with these applications.
Preferred materials: Q1U2VG1G1
API Code: BSTFO |
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Quench
oil pumps / ethylene plants |
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Main
quench oil pumps are the "heart" of an ethylene plant. Requirements to
the mechanical seal concerning safety of operation and service life (MTBF/MTBR)
are accordingly high.
Due to high shut-down and seal exchange costs, the mechanical seal must
be designed as a "long-term seal". |
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| 861 |
- double-acting
/ back-to-back
- preassembled
cartridge mechanical seal ready for installation
- balanced
- multiple
springs (protected on the product side)
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| Dimensions: |
70-200
mm |
| pmax: |
50
bar |
| t: |
-
120°C...315°C
(acc. to secondary seal) |
| vmax: |
35
m/s |
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Operation:
API plan 53, pressure-superimposed, circulating barrier fluid quench -
external vessel (s. key plan)
Overdimensioning of the most important sealing elements
flexible, self-aligning arrangement of seal faces/ stationary seats
Solid hard alloy seal faces in special seal face geometry; optimized barrier
fluid flow
long-term mechanical seal; proved service life > 4 years in main quench
oil pumps |
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Hydrogenation
processes / nitriles / fatty acids |
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In
catalytic hydrogenation processes the mechanical seals in process pumps
have to meet highest demands of sealing technique. This is necessary due
to the media to be sealed on the one hand and the type of process on the
other: Nitriles are classified as detrimental to health; delivered hydrogen
is explosive; the inserted metal catalyzers plate on all surfaces (even
on seal faces) and are highly abrasive.
The operating conditions stipulate a change of pressure and temperature
to a considerable degree in short cycles. The mechanical seal is designed
to meet these requirements. |
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| 881 |
- double-acting
incl. auxiliary stuffing box
- preassembled
cartridge mechanical seal ready for installation
- balanced
- independent
of direction of rotation
- multiple
springs
- stationary
design
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| Dimensions: |
30-200
mm
(also in inches) |
| Techn.
data (of this application): |
| Dimensions: |
(sd)
82 mm |
| p: |
0
- 36 bar (50 bar) |
| t: |
20°C
- 280°C |
| v: |
12
m/s (25 m/s) |
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Operation:
barrier pressure superposition / auxiliary flushing
Solid mechanical seal with safety reserves: mechanical seal outside the
medium up to a max. of 150 bar and auxiliary stuffing box on the atmospheric
side
guided circulation flow for optimal heat dissipation
excl. use of solid seal faces / stationary seats flexibly run on bearings
double pumping screw to assist barrier medium circulation
Materials (for this application): U2 U2 K G1 G1 + U2 Q2 V
Aggregate to be sealed: reactor circulation pump in hydrogenation / specific
process pump with reinforced shaft and bearing |
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Hot
water |
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For
single-stage pumps with cantilevered rotor disk. Our concept for
sealing of hot water up to a max. of 200C° is to work without
auxiliary cooling, to use a single-acting mechanical seal in stationary
design, with rotating throttle bush and a quench fluid vessel/ thermosyphon.
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| 208S |
- single-acting
- preassembled
cartridge mechanical seal ready for installation
- independent
of direction of rotation
- multiple
springs (protected)
- stationary
design
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| Dimensions: |
28-75
mm |
| pmax: |
25
bar |
| tmax: |
200°C |
| vmax: |
25
m/s |
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Material:
AQ2EGG (altern. Q1Q1EGG)
Operation: "dead-end" with circulation via separate thermosyphon vessel
Assembly aids; solid gland with ½" connections (ZE/ZA); mechanical seal
complete with rotating throttle bush.
Solid seal faces/ stationary seats, "self-aligning" arrangement.
Accessories: Thermosyphon vessel type 8L (6124-4)
Arrangement: acc. to key plan 7153-3/1.
The cessation of auxiliary cooling, which is often rather susceptible
(e.g. to calcification of the cooling chamber) makes this concept rather
economical. The service life is also usually much longer than with the
conventional way of sealing.
Seal 208S for this kind of application is adapted to the resp.
aggretate; there have been applications in KSB pumps, HPK, CPK, HDA, Etanorm;
Sulzer-, Halberg-, TurboEgger and other pumps.
We also have successful solutions for hot water applications
with multiple-stage pumps with double bearings. For inquiries refer
to CHETRA. |
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