This decision would be made by a pigging services company during the design process. Technical data and financial impacts would have to be analyzed prior to choosing whether or not a pig launcher and receiver should be combined. We fabricate the products according to the specifications provided to us after the analysis is complete.
Resources
Resources
Do you design the davit or is it designed from another vendor?
We design the davits and have developed a standard design for ones that are generally 12”-24” in size. We design each davit per requirement for sizes above 24”.
Do you only use ASME Codes to evaluate pressure vessels or do you also use other standards such as CODNAP and AD Merkblatter for reduction in thickness of vessels?
Normally, we only use ASME Codes to evaluate reduction of thickness in pressure vessels.
Why is there a major and minor barrel in a pig launcher and receiver?
A major barrel is bigger than the normal piping in the system to make it easier to insert the pig and launch and receive it. The minor barrel has the same inside diameter as the main pipeline and is used to clean the pipes.
How do you define a hydro-test pressure based on design pressure?
Hydro-test pressureand holding times vary for different design codes. For example, the ASME SEC VIII Div.1 general hydro-test pressure will be1.3 x design pressure (minor factors may vary for this equation as well) and forpiping design codes, the hydro-test pressure will be ASME B31.4,B31.8 1.5 xdesign pressure.
What is a davit?
A davit (particularlyfor manways) is a mechanically designed hinged guide and support system thathelps ease the opening and closing of large and heavy blind flanges. Thisassembly can be designed for horizontal and vertical applications.
What is a spectacle blind?
A spectacle blindconsists of a blind and spacer. The blind is installed in between flanges tosecurely shutdown pipeline during leakage or maintenance. When a blind is notrequired, a spacer can be installed in between flanges to continue regularoperating conditions.
What is a flow rate?
The flow rate is theamount of liquid passing through a particular area over a period of time. It isgenerally measured in gallons per a minute or cubic feet per meter.
How does an orifice plate work?
The small hole on orifice plates restricts flow which causes the pressure to drop. The pressurecan be measured using pressure gauges before and after the orifice plates whichallows you to determine the flow rate using the Bernoulli’s Equation. Anorifice plate is installed between orifice flanges or a metering unit.
What is an orifice plate?
Anorificeplateis a device used formeasuring flow rate. It is a thin plate with a hole in the middle that isusually placed in a pipe where fluid flows.
Orifice Plates
What type of media can pass through a transition piece?
Mediathat can pass through a transition piece include air, liquid, gasses, dust,dirt, and chemicals.
Can duct work include expansion joints?
Duct work assemblies can include fabricated elbows, tees,straight sections of duct work, fabric or metallic expansion joints and can berectangular or round.
What is duct work?
Ducts are a series of sectioned tubes, which transfer either heated orcooled air from the furnace or air conditioner, throughout the building.
Are dampers motor-driven?
What is a damper?
What is R-Stamp certification?
Sweco Fab, Inc., our subsidiary, holds the National Board R-Stamp which enables us to do repairs and alterations on pressure vessels, boilers, and pressure-retaining items. Sweco acquired the National Board R-stamp in 2007. The R-Stamp requires maintaining high standards in materials, systems, and procedures and is issued by the National Board of Boiler and Pressure Vessel Inspectors.
Pressure Vessel Manufactured by our Subsidiary, Sweco Fab
What is U-Stamp certification?
Sweco Fab, Inc., our subsidiary, holds the ASME U-Stamp which gives us the ability to manufacture and work on unfired pressure vessels. Sweco acquired the ASME U-stamp in 1962 and has maintained it through-out the regular audits. The U-Stamp represents ASME's section VIII Division 1; rules for the construction of pressure vessels. In order to obtain the U-Stamp, Sweco Fab was required to meet ASME's guidelines for the design, fabrication, inspection, and testing of Pressure Vessels. In order to maintain the U-stamp, we regularly update our designs and fabrication processes while undergoing routine examinations and inspections.
How do you analyze duct work?
We use CAESAR II software to conduct pipe stress analysis onduct systems.