Product Overview
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Competitive
Advantages of Vision Grooved Piping Products |
| Main Difference
between Rigid Pipe Systems and Flexible Systems |
| Applications
of Vision Grooved Piping Products |
| Gasket |
| Housing
Sections (for Flexible and Rigid Couplings) |
| Bolts and
Nuts |
| Grooves |
| Product
Data Chart Notes |
| Fitting
Size Chart |
|
Competitive Advantages
of Vision Grooved Piping Products |
There
are three conventional methods for pipe connections, i.e., welding,
flanging and threading. Vision grooved piping system is designed
to join pipes more easily and cost-efficiently than these traditional
methods and to provide a safer working environment.
Vision grooved piping system can join pipes by applying Vision
products on the external surface of these pipes, which will
not cause any damages or contamination to the inside of these
pipes. What is required is only to cut or roll a groove on the
outside of pipe end, or to drill a hole on the pipes while Vision
Hole Cut Type Couplings are used.
Vision has developed a range of products to meet the demands
of our customers for faster, safer, cheaper and more environment
friendly pipe connections. Apart from grooved couplings, fittings,
valves, roll and cut groove tools, Vision has also developed
a range of fast installation piping products to provide even
faster pipe connections.
In addition to speed, reliability and versatility, Vision grooved
piping products have intrinsic advantages over conventional
pipe connection methods, |
- No contamination
of sealing dope or welding slag to the pipes;
- Easy maintenance
and removal;
- Minimal investment
in specialist equipment or labor force;
- Simple and
easy pre-preparation of pipes in the workshop or on site;
- Reduced risk
and improved safety;
- Absorption
of noise and vibration;
- Absorption
and elimination of stress from settlement of buried pipes;
- Accommodation
of joint deflection and misalignment;
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Main Difference between
Rigid Pipe Systems and Flexible Systems |
As
the name suggests, Vision Rigid Couplings provide a completely
rigid joint that does not allow for linear movement of the pipe
assembly, typically needed when expansion and contraction of
the pipeline is a factor. Vision Rigid Couplings fix the connected
pipe ends at their maximum allowable separation and prevent
lateral or flexural movement.
Vision Rigid systems are therefore suitable for applications
such as risers, valve connection and installations in mechanical
rooms where temperature fluctuations are small and generally
where the application or design calls for rigid installations.
Vision Flexible Grooved Couplings are designed to provide sufficient
controlled angular, linear and rotational movement at each joint
to accommodate expansion, contraction, setting, vibration and
other application related movement of the piping system.
Vision Flexible Couplings provide advantages in designing piping
systems. Each coupling can cater for a certain amount of linear
movement reducing or eliminating the need of additional expansion
loops or specialist joints. Flexible couplings also allow controlled
angular movement of the pipe to assist pipe installation and
alignment. The added benefits in terms of flexibility and pipe
movement must be considered when determining design of hanger
and support spacing.
Compared with alternative flexile metal and electrometric arch-type
pipe connectors, Vision Flexible couplings demonstrate measurably
better vibration attenuation when placed adjacent a source of
vibration, such as a pump. The resilient Gasket within the Vision
Grooved Coupling and the groove tolerance fit effectively provides
a vibration damper at every joint reducing or often eliminating
the need for additional proprietary noise suppression devices.
Flexibility in the Couplings also provides in-built system protection
against failure or rupture due to seismic tremors and quakes
in earthquake prone Ares. |
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Applications of Vision
Grooved Piping Products |
| These
products could be applied in the following areas, |
- Heat exchange
and air-conditioning system;
- Fire protection
system;
- Water supply
or disposal;
- Commercial
and industrial constructions;
- Mining;
- Military;
- Petrochemical
and gas piping system;
- Power plant;
- Marine;
- Plumbing;
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Gasket |
The
unique single piece "C" style design of the gasket
has been engineered to provide a pressure responsive, leak-tight
seal in both pressure and vacuum applications without the aids
of external forces. The "lips" the gaskets are molded
so that upon installation on the pipe ends thy provide compression
against the pipe surface to establish the leak-tight seal.
The gasket cavity functions as a "pressure" reservoir.
Pressure within the pipe system is applied to the internal surfaces
of the gasket, which increased the sealing force and enhances
the leak-tight seal. In vacuum systems, non-pressure-responsive
seals tend to "lift off" the pipe, producing leak paths. However,
the Vision gasket reacts to the negative pressure (higher outside
atmospheric pressure) as to improve the sealing capability of
the gasket.
To assure the maximum sealing capacity of gasket for intended
service, correct gasket material selection is essential. Many
factors must be considered when determining the best gasket
materials for the specific application. Among them, the type
of fluid, temperature, duration and continuity of service are
primary factors. Always refer to the Chart below to select the
appropriate gasket to ensure the best sealing capacity.
General data and service recommendations are as following*, |
| Temperature
(Centigrade) |
Gasket
Material |
Recommended
applications |
|
-50
oC to +150 oC
|
EPDM |
Hot
Water, Dilute Acids, Oil Free Air, Various Chemicals,
but not for Petroleum Services; |
| -70
oC to +260 oC |
Silicon |
Potable
Water, Hot Water, Oil Free Air, High-Temperature Vapor,
etc, but not for Petroleum Service; |
| -30
oC to +85oC |
Nitrile |
Petroleum
Products, Vegetable and Mineral Oils, Air with Oil Vapors.
Not Recommended for Hot Water Services or for Hot Dry
Air Over 66 oC |
| -6
oC to +148oC |
Vinton |
Oxidizing
Acids, Petroleum Products, Halogenated Hydrocarbons, Lubricants,
Hydraulic Fluid, Organic Liquids, and Air with Hydrocarbon. |
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*If
the intended service is NOT included in the Table above, contact
Vision staff before proceeding.
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| Vision
Gaskets must always be lubricated with a thin, uniform coating
of lubricant to assist location and assembly and to avoid pinching
o the Vision Gasket, which may cause damage or leakage. For
wet systems, used vegetable soap based lubricant or its equivalent.
For dry systems, Vision recommends the use of a silicone lubricant.
Do not use petroleum-based lubricants under any circumstance.
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Housing Sections (for
Flexible and Rigid Couplings) |
The
design of Vision Coupling Housing Section allows it to
self-center around the pipe and to encircle and retain
the gasket against the application of internal system
pressure or vacuum. The housing section keys fit into
and engage the pipe-end grooves around the entire pipe
circumference, thus restraining the pipe ends fro separation
due to the application of internal pressure.
Vision Flexible Couplings provide designed-n clearances
between the housing key section and the pipe grooves to
permit both angular and longitudinal movement of the pipe.
Rigid couplings grip the pipe and lock the joint into
the position.
The standard output of housing section is made of Ductile
Iron conforming to ASTM A536, Grade 65-45-12. Alternative
materials available on request are steel, stainless steel
and copper.
Standard output of housing sections are coated with rust
inhibiting, lead free orange paint for general service
applications. Alternative paints with different colors
or specifications are also available on request.
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Bolts and Nuts |
Heat-treated
oval neck track head bolts serve to joint and secure the housing
sections together. The oval neck track head design of the bolts
head allows the hex nuts to be tightened with only one wrench.
Vision bolts and nuts conform to ASTM A-183 minimum tensile
110,000 psi.
The table below shows the bolt size and corresponding wrench
(or socket) size for the hex nuts, |
| Metric
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Bolt
Size
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M10
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M12
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M16
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M18
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M20
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M22
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Wrench
Size
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16
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22
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24
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27
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30
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34
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| ANSI
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Bolt
Size
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3/8
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1/2
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5/8
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3/4
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7/8
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1
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1-1/4
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Wrench
Size
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11/16
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7/8
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1-1/16
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1-1/4
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1-7/16
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1-5/8
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2
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Grooves |
| A grooved
is prepared on the pipe ends to receive the coupling housing:
the groove takes various configurations depending on pipe wall
thickness, pipe material, size and other factors. For complete
details refer to the General Notes and Guidelines at the end
of the catalogue. |
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Product Data Chart Notes |
- Nom. Size
in/DN (mm): The nominal ANSI pipe size in inches or
pipe OD in millimeters (see the note below for Pipe OD)
- Pipe OD
in./mm: Nominal outside diameter of pipe
- Max. Wk.
Pressure PSI/bar: Maximum line pressure, including surge,
to which a joint can be subjected based on standard weight
steel pipe. Pressure ratings may differ on other pipe materials
and/or wall thickness. Contact Vision for more details.
- Max. End
Load Lbs./KN: Maximum end load from all interior and/or
exterior forces to which the joint can be subjected based
on standard weight steel pipe. End loads may differ on other
pipe materials and/or wall thickness. Contact Vision for
more details.
- Range of
Pipe End Separation in/mm: Range of pipe end separation
is the gap between the pipe ends due to assembly;
- Deflection
per coupling Degrees: Maximum allowable angular deflection
of pipe from centerline;
- "X", "Y",
and "Z" are external dimensional for reference only;
- Approx.
Wt. Ea. Lbs./Kg: Approximate weight for a fully assembled
coupling with gasket, bolts and nuts.
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Fitting Size Chart |
| Fitting
Size Chart is used to determine the OD of the pipe that the
fittings are to be used with. Vision Fittings are identified
by either the Nominal size in inches or the pipe OD in OD in/mm. |
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Nominal
Size Inches
DN/mm
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Pipe
OD Inches
mm
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Nominal
Size Inches
DN/mm
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Pipe
OD Inches
mm
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1
25
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1.315
33.7
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5 1/2 OD
125
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5.500
139.7
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1 1/4
32
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1.660
42.4
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6
150
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6.625
168.3
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1 1/2
40
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1.900
48.3
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6 1/4 OD
150
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6.259
159.0
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2
50
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2.375
60.3
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6 1/2 OD
150
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6.500
165.1
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2 1/2
65
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2.875
73.0
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8
200
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8.625
219.1
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3 OD
65
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2.996
76.1
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10
250
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10.750
273.0
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3
80
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3.500
88.9
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12
300
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12.750
323.9
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3 1/2
65
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4.000
1.1.6
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14
350
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14.000
355.6
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4
100
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4.500
114.2
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16
400
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16.000
406.4
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4 1/4 OD
100
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4.250
108.0
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18
450
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18.000
457.2
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5
140
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5.563
141.3
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20
500
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20.000
508.0
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5 1/4 OD
125
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5.236
133.0
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24
600
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24.000
609.6
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