ASME BPVC-VII ADD:2008 pdf free download

ASME BPVC-VII ADD:2008 pdf free download RECOMMENDED GUIDELINES FOR THE CARE OF POWER BOILERS
1.01
scOPE
This portion of the rules is intended to cover generaldescriptions, terminology , and basic fundamentals of heat-ing boilers，controls，and automatic fuel burning equip-ment. Because of the wide variety of makes and types ofequipment in use, it is general in scope.
1.02
USE OF ILLUSTRATIONS
The illustrations used in this Section have been selectedto show typical examples of the equipment referred to inthe text and are not intended to endorse or recommendany one manufacturer’s product; nor are the illustrationsintended to be used as design criteria or as examples ofpreferred configurations of equipment.
1.03MANUFACTURER’S INFORMATIONFor detailed information on any specific unit, the Manu-facturer’s information should be consulted.
1.04
REFERENCE TO SECTION IV
The boilers discussed in this Section will be those limitedto the operating ranges of Section IV , Heating Boilers, ofthe ASME Boiler and Pressure Vessel Code as follows:(a) steam boilers for operation at pressure not exceeding15 psi (100 kPa)
(b) hot water heating and hot water supply boilers foroperation at pressures not exceeding 160 psi (1 100 kPa)and/or temperatures not to exceed 250°F (120°C)
1.05
GLOSSARY OF TERMS
For terms relating to boiler design, refer to Section IV,Heating Boilers，Appendix E,Terminology. For termsrelating to boiler water treatment，refer to 9.12 of thisSection,Glossary of Water Treatment Terms.
A. Boilers and General Terms
absolute pressure: pressure above zero pressure, the sumof the gage and atmospheric pressures.
accunulator (steam): a pressure vessel containing waterand steam that is used to store the heat of steam for use at a later period and at some lower pressure.
air purge: the removal of undesired matter by replace-ment with air.
air vent: a valve opening in the top of the highest drumof a boiler or pressure vessel for venting air.Also a device,manual or automatic，that will effect the removal of airfrom a steam or hot water heating system. It is usuallylocated at the highest point in the system.
allowable working pressure: the maximum pressure forwhich the boiler was designed and constructed.
alfitude gage: a pressure gage calibrated in feet, indicat-ing the height of the water in the system above the gage;usually found as combination pressure, altitude, and tem-perature gage.
ambient temperature: the temperature of the air sur-rounding the equipment.
baffle: a plate or wall for deflecting gases or liquids.base: support for boiler.
beaded iube end: the rounded exposed end of a rolledtube when the tube metal is formed over against the sheetin which the tube is rolled.
belled tube end: see flared tube end.
bellows seal: a seal in the shape of a bellows used toprevent air or gas leakage.
blind nipple: a nipple, or a short piece of piping or tube,closed at one end.
blowdown: the difference between the opening and clos-ing pressures of a safety or safety relief valve.
blowoff valve: a valve or cock in the bottom and/or nearthe water line of a boiler. that, when opened， permits freepassage of scale and sediment during the blowoff operation.boiler: a pressure vessel that incorporates a fuel inputdevice or mechanism to heat water for space heating orother purposes or to convert water into steam for use inan external distribution system.
(a) watertube: a boiler in which the tubes containwater and steam,the heat being applied to the outsidesurface.
(1) bent tube: a watertube boiler consisting of twoor more drums connected by tubes, practically all of whichare bent near the ends to permit attachment to the drumshell on radial lines.
(2) horizontal: a watertube boiler in which themain bank of tubes is straight and on a slope of 5 deg to15 deg from the horizontal.
(3) sectional header: a horizontal boiler ofthe lon- gitudinal or cross drum type, with the tube bank composed of multiple parallel sections, each section made up of a front and rear header connected by one or more vertical rows of generating tubes and with the sections or groups of sections having a common steam drum.
(4) boxheader: ahorizontal boilerofthe longitudi- nal or cross drum type consisting of a front and a rear inclined rectangular header connected by tubes.