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Pressure Vessels
EPOXY LINING
Two part epoxy polyamide coating applied on a sand blasted surface to a 10-12 mil dry film thickness. (DFT) Correctly
EXPANSION TANK
A vessel that holds the extra volume of hot water in a system due to thermal expansion and allows it back into the system when it cools down.
GALVANIZED
Describes a fabricated vessel that has been coated in and out by immersion in molten Zinc. Known as Hot Dip Galvanizing, it is rated at 400o F in service.
GLASS LINING
Porcelain enamel coating. Material is sprayed on a sandblasted surface and fired at 1500o F. Hanson Glass lined tanks are supplied with magnesium ANODES and are rated at 210o F.
HOLIDAY TEST
A test to confirm that a tank lining or paint system has achieved complete coverage. This requires that all sharp edges are ground smooth after welding.
HEAT CURE
Controlled drying and curing of an epoxy tank lining by hot air blowers.
PRESSURE VESSEL
Usually a welded steel cylindrical tank designed and built to store its contents under pressure. Different rules apply according to the contents.
SHELL
The cylindrical section of a vessel, not including the heads.
ISO
International Organization for Standardization. Publishes procedures designed to improve efficiency in manufacturing and other industries worldwide. (www.iso.org)
ABS
American Bureau of Shipping. Inspects and certifies pressure vessels manufactured for use on ships built under their auspices. (www.eagle.org)
ASME
American Society of Mechanical Engineers. The Group that oversees boiler and pressure vessel construction and safety rules in the USA. (www.asme.org)
NATIONAL BOARD
An inspection, safety, educational and record keeping association of pressure vessel inspectors. Publishers of the National Board Inspection Code. (www.nationalboard.org)
NEMA
Association of Electrical and Medical Imaging Equipment Mfrs. A Trade Association that represents the interests of Electrical manufacturers. Publishes safety and technical information including standardized mounting designs for electric motors used with air compressors. ( www.nema.org)
NSF
National Sanitary Foundation. Provider of public health and safety-based risk management solutions. Publishes tank lining standards. (www.nsf.org)
SRCC
Solar Rating and Certification Corporation. Administers certification, rating, and labeling programs for solar collectors (OG-100) and solar water heating systems. (OG-300)
SSPC
The Society for Protective Coatings. (Formally the Steel Structures Painting Council.) Publishes information on surface preparation, coating selection, coating application, environmental regulations, and health and safety issues. (www.sspc.org)
STRESS CRACKING (I)
Ammonia (NH3) can cause this problem in carbon steel pressure vessels unless they have been stress relieved. As cold formed heads are more at risk that the tank shell, often the heads only are stress relieved before tank fabrication.
STRESS CRACKING (II)
This can occur in 300 series stainless steel vessels that have had any contact with chlorides. More likely at higher temperatures and higher concentrations of chlorides. Much less likely with 316 grade than 304.
STRESS RELIEVING
Heat treating a fabricated tank in a furnace. This relaxes the stresses caused by metal forming and welding during manufacture.
SURGE TANK
A vessel that adds volume to a system to reduce the effect of surges.
USCG
United States Coast Guard. Approves designs for pressure vessels used on ships under their jurisdiction. (www.uscg.mil)
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Terminology
