经典的爆破片课程

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Type S-90
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Cross Scored 90% maximum operating pressure All features & benefits of the RB-90 are retained while eliminating the knife blade opening mechanism. 十字刻槽 操作比达90% 保留了RB -90的所有特性和优点，消除了刀片的局限
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爆破片材料最高适用温度
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GB567标准
• 设计爆破压力 (design burst pressure) 设计爆破片时由需方提出的对应于设计爆破温度下的爆破压力值 • 制造范围(manufacturing Design Range) 厂家和用户之间商定并认可的压力制造范围，最终标定的爆破压 力必须在此范围内，同时兼顾经济性和实用性。 • 标定爆破压力(Marked burst Pressure) 同一批次爆破片在一定温度下进行爆破试验所得实际爆破压力的 算术平均值，并最终标记在铭牌上的爆破压力值 • 爆破允差 (Burst Tolerance) • 爆破片实际的试验爆破压力相对于标定爆破压力的最大允许偏差 其值可以是用正负号表示的绝对数值或百分数 • 当商定制造范围为零时此允差即表示对设计爆破压力的最大偏差 且此允差范围亦为允许爆破范围
爆破允差
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最大操作比(MOP)
• Maximum pressure to which a disk may be exposed during normal operating conditions（正常工作状态下 爆破片能够承受的最大压力）
– Varies from 50% to 95% of marked burst pressure depending on type of disk
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制造设计范围
• A “range” of pressures agreed upon between user and manufacturer governing the pressure range within which the marked burst pressure must fall. • 厂家和用户之间商定并认可的压力制造范围，最终标定的 爆破压力必须在此范围内。 • A “pre-manufacturing agreement” between the user and the manufacturer which defines the user’s acceptable range of pressures within which the disks must be rated (marked). 在生产前用户和厂家达成一致，共同定义的双方均可接受 的压力范围，爆破片必须在此压力范围内爆破。（标定的 爆破压力） • Offered to satisfy the need of “economics” and “availability”. 6 制造设计范围同时兼顾经济性和实用性。
• Rupture Disks are installed in service in one of two directions
Forward Acting 正拱型
OR OR
Reverse Buckling 反拱型
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有何不同What’s the difference?
• 弹性负荷爆破片相对压力负荷爆破片有许多局限Generally, tension loaded disks have many performance limitations compared to reverse buckling disks • These limitations include • Limited cycle life有限的使用寿命 • Limited operating margin有限的操作余量 • Limited resistance to vacuum or back pressure without support有限耐受真空或背压 • Less favorable sealing characteristics有限的密封性能 • Product buildup on process side of disk介质淤积 • MDR limitations制造范围限制
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S-90
• • Recommended for gas service only In liquid service (pure hydraulic) – Slow pressure rise could allow the disk to “roll through” and not open.
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材料 Material
• 标准Standard) • 特殊(s– Nickel – 316SS – Nickel Alloy 400 – Nickel Alloy 600 – Alloy C-276 – Titanium – Tantalum – Gold – Silver – Platinum – Others
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• A circular-scored reverse buckling rupture disk • Designed specifically for use either in liquid or gas service • “Yolk” prevents fragmentation • 环形刻槽的反拱爆破片 • 特殊设计既可用于液体也可用于气体环境 • “Y”型衬板防止产生碎片
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Type “JRS” (“JAWS” )
• When reversal pressure is reached, the disk “snaps through” • Metal is cut open by the “tooth ring” • Petal is held captive by special design of the retainer bar • 当系统压力达到爆破压力，爆破片快速反转 • 金属片被齿形环割裂并开启 • 开启的“花瓣”被特殊设计的挡板条截留，不会产生碎片
如果在纯液相中使用 – 缓慢的压力上升使爆破片慢慢开启并泄露，无法全开 – 可能在刻槽出产生一点裂缝 – 可正向爆破，开口很小，与流量成正比
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JRS Disk JRS型爆破片（1977年专利） (Patented 1977)
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Permits lower pressures in reverse buckling disks than ever before 相比之前的反拱爆破片可以达到更低的爆破压力
• Higher operating pressure moves or “re-forms” disk material which results in fatigue and premature activation.
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最小泄放面积和爆破片尺寸计算
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Disk Tag 爆破片标牌
ASME requires tag that shows: – Manufacturer – Type – Lot number – Disk Material – Size – Marked burst pressure – Specified disk temperature – Minimum Net Flow Area – Certified flow resistance KR – UD Symbol (Hand Stamped) • NB recognition
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双向爆破Dual Acting Disks
– Some disks are designed to relieve in either direction or they may be tension loaded or reverse buckling depending on which direction they are installed. – These disks include the AV, Vac Saf and Hi-Lo series, Eco Saf series, and FSM – These disks have all the limitations of forward acting disks but may not have any of the advantages of reverse buckling disks.
(Natural Weak Point)
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爆破片的选择范围
• 尺寸 size
– 额定直径从1/8” to 72” / 3mm 到1800mm
• 额定爆破压力 burst pressure
– 10mBar to 9300 Bar
• 温度 temperature
– -273 deg. C to 600 deg. C
ASME 标准要求标牌标 识以下信息 – 生产厂家 – 型号 – 出厂编号 – 爆破片材料 – 尺寸 – 标定爆破压力 – 额定爆破温度 – 最小泄放面积 – 经过认证的流体阻 力系数Kr值 – UD标识 • NB 标识
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Last Variable: Directional Orientation 爆破片动作方向
– May have only a “cracked” score line.
– Would then break in forward acting manner with reduced opening that is in proportion to flow demand.
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建议在气相中使用
What is a Rupture Disk?
• A designed weak point in a pressure system. • Definition:
A non-reclosing pressure relief device designed to activate at a specified pressure.
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JRS
• Recommended for gas service only • Damage ratio – Should a damaged disk be installed… – The disk will reverse and open at a maximum of 1.5 times its rated pressure (Damage Safety Ratio) • 推荐仅用于气体环境 • 损坏比 – 如果一个损坏的爆破片被安装 – 爆破片将在不超过标定压力1.5被的压力下爆破(安全损坏比）
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In 1966, BS&B introduced Reverse Buckling (Compression-Loaded) Technology 1966年，BS&B 发明反拱型 爆破片（压载型）技术
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Reverse Buckling Allows: 反拱爆破片
• • • • • • • • • • • • Flat seating surfaces Non-fragmenting design Extended cycle/service life No vacuum support required (typical) Smooth side of disk to process Up To 95% Maximum Operating Pressure 平面底座 无碎片设计 大大延长使用寿命 无需真空托架 爆破片接触介质面为光滑面，无物料积累问题 做大操作压力可达到设计爆破压力的95%
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RLS Disk (BS&B Patented 1983) RLS型爆破片（BS&B1983年专利）
• The FIRST reverse buckling disk designed for liquid service (full hydraulic) applications • 第一个设计在全液体工况中使用的爆破 片