(b)   Tube patches. Also included is a glossary of terms commonly associated with boilers, controls, and fuel burning equipment. Recommended Guidelines for the Care of Power Boilers, X. Fiber-Reinforced Plastic Pressure Vessels, XI. Aug. 21, 1991. Secs. Flush welded patches shall be applied as specified in Figure 14-3.17-1 or by other equivalent methods. (c)   When the maximum allowable working pressure exceeds 100 pounds per square inch, each bottom blowoff pipe shall be fitted with an extra-heavy valve or cock. (d)   Reports. Where there is no extraction of steam (closed system), a safety fracturing disk may be used in addition to the spring-loaded pop safety valve. Aug, 21, 1991. (a)   Authorization. The vessel erector shall hold the appropriate ASME stamp for vessel construction. Patches may be of any shape or size. back. back. § 14-9.7   Safety valve and safety relief valve testing and repairs. duplicate the mechanism that actually stops the flow of fuel and feedwater. Repairs shall be work such as, but not limited to, the following examples: (2)   the addition of welded attachments to pressure parts such as, but not limited to: (ii)   hex steel or expanded metal for refractory lining; (vii)   corrosion-resistant weld overlay; and. (g)   Platforms shall be installed opposite one end of all drums of water tube boilers which are over four feet above the floor or walkway, to permit safe access to the interior of drums for cleanouts and inspection. The gauge glass shall be installed so that the midpoint is at the normal boiler water level. Wasted areas in stayed and unstayed surfaces may be built up by welding provided that in the judgment of the authorized inspector the strength of the structure will not be impaired. Article 303 requires annual inspections of boilers. (f)   A combination stop and check valve in which there is only one seat and disk, and in which a valve stem is provided to close the valve, shall be considered only as a stop valve, and a check valve shall be installed as otherwise provided. back. (b)   This provision shall not apply to boilers of the vertical tubular type or to dryback scotch type. (a)   General requirements. (e)   Where it is necessary to go on top of boiler or boilers for maintenance or operating purposes, a clearance of at least seven feet shall be maintained from the working platform to the underside of any overhead structure. The space around each ball must be not less than 1/8 inch, and the travel movement from the normal resting place to the seat must be not less than 1/4 inch; (iv)   the ball seat in the upper fitting must be a flat seat with either a square or a hexagonal opening, or otherwise arranged so that the steam passage can never be completely closed by this valve; (v)   the shutoff valve in the upper fitting must have a projection which holds the ball at least 1/4 inch away from its seat when the shutoff valve is closed; and.

The maximum rated capacity of a safety valve shall be determined by actual steam flow at a pressure of three percent in excess of that at which the valve is set to blow, and with a blowdown in accordance with section 14-9.12 of this Subpart and credited with 90 percent of the flow developed. (d)   When a stop valve is so located that water can accumulate, ample drains shall be provided. (7)   installation of new nozzles or openings of such a size that reinforcement is not a consideration; (8)   the addition of a nozzle where reinforcement is a consideration may be considered to be a repair provided the nozzle is identical to one in the original design, is located in a similar part of the vessel, and is not closer than three times its diameter from another nozzle; (9)   the installation of a flush patch to a boiler; (11)   welding of wasted or distorted flange faces; (12)   replacement of slip-on flanges with weld neck flanges or vice versa; (13)   seal welding of butt straps and rivets; and. Surface critical code sections based on your project inputs. (ii)   Prior to seal welding riveted joints, the area should be examined by an appropriate method of nondestructive examination to assure that there are no cracks radiating from the rivet holes. Stamping or nameplate shall be applied adjacent to the original manufacturer's stamping
If the superheater outlet header has a full, free, steam passage from end to end and is so constructed that steam is supplied to it at practically equal intervals throughout its length so that there is a uniform flow of steam through the superheater tubes and the header, the safety valve, or valves, may be located anywhere in the length of the header. Any relocation shall be described on the Report of Alteration. (c)   Each boiler shall have three or more gage cocks, located within the range of the visible length of the water glass, when the maximum allowable working pressure exceeds 15 pounds per square inch, except when such boiler has two water glasses with independent connections to the boiler, located on the same horizontal line and not less than two feet apart. (i)   check valves in upper and lower fittings shall be of solid noncorrosive metal ball type to avoid need for guides; (i)   6 for boilers not over 10 years old; Career Exploration for Youth (CareerZone), Programs & Tools for Workforce Professionals, Repairs, Alterations and Miscellaneous Requirements, Application of provisions relating to certified boiler inspectors, Tube ends of water tube boilers and superheaters, Power actuated pressure relieving devices, Setting of safety valves and safety relief valves, Safety valve and safety relief valve testing and repairs, Muffler on safety valve or safety relief valve, Boiler bushing, flange, for feed pipe connections, Formula for maximum allowable working pressure, Factor of safety: butt- and double-strap construction, Factor of safety: lap riveted construction, Construction of miniature boilers under power boiler rules. Code calculators may not be available. When not more than two valves of different sizes are mounted singly, the relieving capacity of the smaller valve shall be not less than 50 percent of that of the larger valve. Expansion tanks shall be of the closed or open type. Lapped and fillet welded patches may be applied provided they are not exposed to radiant heat. Provisions shall be made for the expansion and contraction of steam mains connected to boilers, by providing substantial anchorage at suitable points, so that there shall be no undue strain transmitted to the boiler. Aug. 23, 1991. Derating may be initiated by the owner or the inspector. (c)   An authorized representative of the plate manufacturer may duplicate the required stamping on any material wherever located. Other methods may be acceptable provided they are approved by the department. These restrictions do not apply to closing the valves by external methods. The following items are exempt only from the reporting requirements: (2)   the seal welding of tubes to the tube sheet.

Seal welding may not be considered a strength weld. back. For boilers having a water heating surface of more than 100 square feet, the feed connection to the boiler shall not be smaller than 3/4 inch pipe size. drain between valves. (c)   The safety valve or valves shall be connected to the boiler independently of any other steam connection, without any unnecessary intervening pipe or fitting. Means must be provided for removal and inspection of the lower ball check valve while the boiler is under steam pressure.
Boilers operated at pressures over 400 psi shall be provided with two water gage glasses which may be connected to a single water column or connected directly to the drum. The blowoff tanks shall be constructed in accordance with the provisions of the ASME Code, section VIII, division 1. = maximum allowable working pressure, pounds per square inch. (b)   Mufflers shall not be used on high-temperature water boiler safety relief valves. The feed pipe shall be carried through the head or shell farthest from the point of discharge of the feedwater in the manner specified for a surface blowoff in section 14-9.27(a) of this Subpart, and be securely fastened inside the shell above the tubes. back. (b)   Acceptance of repairs and alterations. Materials shall be of known weldable quality, have at least the minimum physical properties of the material to be repaired and be compatible with the original material. Such a governor used on gas fuel shall be so constructed that in the event of its failure there can be no possibility of steam from the boiler entering the gas chamber or supply pipe. Upon completion of the assembly and installation of boilers and. (e)   In all cases where the returns are fed back to a boiler by gravity, there shall be a check valve and stop valve on the return line, the stop valve shall be placed between the boiler and the check valve and both shall be as close to the boiler as practicable.

When an elbow is placed on a safety-valve discharge pipe, it shall be located close to the safety-valve outlet or the pipe shall be securely anchored and supported. (e)   The valve capacity for each boiler shall be such that the valve or valves will discharge all the pressure that can be generated by the boiler without allowing the pressure to rise more than six percent above the highest pressure at which any valve is set and in no case to more than six percent above the maximum allowable working pressure. Safety valves shall be of the direct spring loaded pop type, with seat inclined at any angle between 45 and 90 degrees, inclusive, to the center line of the spindle. (jj)   Safety valve means an automatic pressure relieving device actuated by the static pressure upstream of the valve and characterized by full-opening pop action.

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