JACKETED EXPANSION JOINTS
Jacketed Expansion Joints are Expansion Joints with another larger Expansion Joint mounted around it, whereby a chamber is formed between the two Expansion Joints. The medium flows through the inner Expansion Joint, while a heating medium, e.g. oil, flows in the chamber between the two Expansion Joints. The oil is heated and flows through the chamber via an inlet and an outlet respectively. On its way through the chamber, the oil emits heat to the inner Expansion Joint, thus maintaining/increasing the temperature of the medium. This increases the fluidity of the medium and eliminates the risk of ”packing up”.
Highly customised design
Jacketed Expansion Joints are highly customised for the exact need and application, as they require a high reliability during the entire service life to avoid the media packing up.
Design range and scope of supply within Jacketed Expansion Joints
The capability design range for Belman and Jacketed Expansion Joints are:
DIMENSIONS:
DN 15-12.000
PRESSURE:
Up to 150 barg or more if required
TEMPERATURE:
-256°C to +1000°C
MATERIALS:
Austenitic stainless steels, High alloys, Duplex, Titanium, Hastelloy,
Incoloy, Inconel, Alloy 59
DESIGN CODES:
EN 13445, EN 13480, EN 14917
ASME VIII, div.I, ASME B31.3
ASME B31.1, EJMA, AD 2000
and others on request
TESTS:
Radiographic examination (X-ray), Helium leak testing, Pressure test, Air test, Dye penetrant test, Magnetic particle examination and many more
JACKETED EXPANSION JOINTS
CASE STORY
of the built-in Expansion Joints. Belman was to find a functional solution to the problem. An engineered
Jacketed Expansion Joint was the solution.
TECHNICAL DESCRIPTION
TYPES & DESIGN
The design of Jacketed Expansion Joints for operational plants, where the medium has a relatively high viscosity (i.e. a very thick medium, such as asphalt), poses a special challenge. The flow is more sluggish with a thick medium due to its inner friction. This creates the risk of the medium settling in the convolutions of the Expansion Joint and blocking the flow and the worst case, the flow can be completely cut off. This phenomenon is often referred to as “packing up”, “cooking” or “caking”. The fluidity of the liquid, i.e. its ability to flow generally increases with higher temperatures. When designing such solution, a Jacketed Expansion Joint can be used to make it possible to increase the temperature of the media in the expansion joint and thus improve the flow.
Usually, a Jacketed Expansion Joint is an Expansion Joint with another larger Expansion Joint mounted around it, whereby a chamber is formed between the two. The medium flows through the inner Expansion Joint, while a heating medium, e.g. oil, flows in the chamber between the Expansion Joints. The oil is heated and flows through the chamber via an inlet and an outlet respectively. On its way through the chamber, the oil emits heat to the inner Expansion Joint, thus maintaining/increasing the temperature of the medium. This increases the fluidity of the medium and eliminates the risk of ”packing up”.
Is it possible to solve the problem through insulation?
Insulation around the Expansion Joint would merely postpone the problem of flow cut-off/”packing up”. The insulation would reduce the speed of the heat loss. But the Jacketed Expansion Joint supplies heat to the medium, which is not possible through insulation alone, as the insulation only retains the existing heat. This heat is not sufficient to minimise the viscosity, nor is it sufficient to avoid a cooling and settling of the medium in the convolutions of the expansion joint. Therefore, the Jacketed Expansion Joint is preferred over insulation for sluggish mediums.
MATERIALS & COATiNG SYSTEM
Materials
Jacketed Expansion Joints can be used in diverse applications and are manufactured in all types of materials according to the intended use. Usually the material is determined by the temperature as well as the type and consistency of the medium. If the medium is very corrosive, usually high-alloy materials are used. The surroundings of the Expansion Joint may also influence the choice of material. The Jacketed Expansion Joints can be designed and manufactured from all kind of materials and also completely in stainless steel.
Coating system
All carbon steel parts will be provided with a standard multi-layer coating system, suitable for outdoor installation or a coating system specified by the project/client
ADVANTAGES
- Elimination of the problem of the media “packing up” in the Expansion Joint convolutions
- Smooth operation and increasing the temperature of the media is now possible and thus ease the flow
- Use of Jacketed Expansion Joints makes it posible to increase the temperature of the media in the Expansion Joint and thus improve the flow.
QUALITY & TESTS
Belman is known for high quality products and therefore our quality control is a fundamental part of our business. All processes during production designed by the Belman quality engineers, is strictly follow and implement according our procedures and instructions and carefully inspected by Belman quality inspectors. All checks and inspections are done according to the strict prevailing Belman quality control procedures which is part of the Belman ISO 9001 quality management system approved by DNV.
ITP & Test
Inspection test Plan generated by the quality management system makes sure that each step of manufacturing has the appropriate inspection points such as Hold and Witness points.
Based on manufacturing code, project specification, application, media, and eventual ship classification rules Belman performs a large variety of quality tests including destructive, non-destructive testing and proof testing. All tests can be witnessed by the 3rd part based on the customer and classification requirements.
- Destructive test: such as life cycle test and burst test to validate the design, i.e., vessels and offshore platforms
- Non-destructive test such as Visual testing, dye penetrant test, Radiography examination, Magnetic testing, ultrasonic testing, hardness testing and PMI for all applications
- Proof tests: leak test with air, leak test with helium and formier gas, hydrostatic pressure test for all application
WE HAVE ENGINEERED
EXPANSION JOINTS SINCE 1994
This enable us to find you the optimum solution to your piping system.
