Dual Laminates双重积层

Dual Laminate 双重积层

Equipment composed of a thermoplastic lining inside an RTP structural member is commonly called a dual laminatestructure(ASME RTP-1)玻璃钢衬热塑性材料的设备被称之为双重积层结构(ASME RTP-1)

Ref. ASME RTP-1

Dual Laminate structure:双重积层结构

Ref: Dow Chemical Co.

至少三个焊道

热塑性材料内衬

粘结剂

防腐层

结构层 焊缝突起

导电表面毡

Thermoplastics 热塑性塑料

Solvent Welded; hot air welded; resin bonded (溶剂焊接；热风焊接；树脂粘结):PVC : Poly (Vinyl Chloride) 聚氯乙稀CPVC : Chlorinated poly (vinyl chloride)氯化聚氯乙烯ABS : Acrylonitrile-Butadiene-Styrene 丙烯腈－丁二烯－苯乙烯共聚树脂

Dual Laminate Structure 双重积层结构

Ref: Dow Chemical Co.

热塑性材料内衬

导电表面毡

防腐层

焊接突起

至少三个焊道

来源：陶氏化学

结构壳体 织物支撑帽材

织物支撑

Thermoplastics 热塑性塑料

hot air welded; fabric backed:Fusion 热风焊接；织物背衬:熔融PP: Poly Propylene 聚丙烯HDPE : High Density Polyethylene 高密度聚乙烯

Partially fluorinated: 部分氟化物PVDF : Poly(vinylidene fluoride). 聚偏氟乙烯ECTFE : Copolymer of ethylene and

chlorotrifluoroethylene乙烯一氯三氟乙烯共聚合物ETFE : Ethylene Tetra Fluoro Ethylene乙烯-四氟乙烯共聚物

Thermoplastics 热塑性材料hot air welded; fabric backed: Fusion热风焊接；织物背衬：熔融

Fully fluorinated: 全氟化物FEP : Fluorinated Ethylene Propylene 聚氟乙烯丙烯PFA : Per Fluoroalkoxy 可熔性聚四氟乙烯MFA: Per Fluoroalkoxyl Methylvinylether可熔性甲基乙烯基聚四氟乙烯PTFE : Poly Tetrafluoroethylene : Not weldable unless modified with small amount of PFA 聚四氟乙烯：非可焊，除非用少量的PFA改性

Weld Strength 焊接强度

Ref. ASME RTP-1

Corrosion Barrier: 防腐层

May or may not include a FRP corrosion barrier behind the thermoplastic liner. 在热塑性内衬的背面可以加也可以不加一层FRP防腐层.User can specify the FRP corrosion barrier 业主可以指定要求增加FRP防腐层User can specify if carbon/graphite veil is needed 业主可以指定使用碳纤维/石墨表面毡Carbon veil/veil/2 csm behind the thermoplastic liner 热塑性内衬层后面用一层碳纤维表面毡，一层表面毡，两层短切毡支撑Resin impregnated with graphite powder can also be used for target purposes 在特定的要求下，可以使用石墨填料。

Industry specs: 工业指标

Target is needed for weld spark testing which is the most common method of verifying weld integrity.电火花检测是检测焊接完整性的最常用方法5 Kv per mm of thickness according to ASME RTP-1, M12D-510 (a).根据ASME RTP-1和 M12D-510(a)，对于每1毫米厚度, 应使用5千伏电压Each subsequent test on the same welds will be at a voltage 90% of the voltage used for the previous test. 每次对焊点作复验时, 电压应该是前一次检查电压的90％

Bond Strength 粘结强度

Bond strength measuring tools: 粘结强度检测工具A tensile testing machine with 5000 lb. capacity and a measuring force of +/- 1 lb.需要一个拉伸测试仪, 量程为5000lb（2250Kg）、误差为正负1lb.

Testing facility must have the following sample holders: 测试工具必须有以下的测试能力

Climbing Drum Peel test, D-1781 滚筒剥离试验Peel test per B-4994 B-11 剥离试验Lap Shear test per B-4994 B10 or D 3846 搭接剪切试验

Liner Inspection 内衬层检查

Ref. ASME RTP-1

Bonding Resin 粘结树脂

The bonding resin for bonding PVC or CPVC to the RTP structure is applied to the thermoplastic which promotes a chemical bond between the thermoplastic and the RTP overlay.粘结用的树脂涂在PVC、CPVC上会产生一层化学粘结层把热塑性塑料与玻璃钢粘结起来。The bonding resin will be tested for bond strength per ASME RTP-1, M12B-par. 634.2 粘结树脂要按照ASME RTP-1,M12B-par.634.2检测粘结强度。

Welding 焊接

Types of welding allowed in the Standard:允许焊接类型

Hot gas 热气焊接Extrusion 挤出焊接Hot Plate 热板焊接Flow fusion 溶焊

All welds must have full penetration – Exception is the fillet welding when using the extrusion welds.所有的焊接必须是全焊透 ，但挤出焊接的角焊是个例外

Examples 例子

Ref. ASME RTP-1

Examples 例子

Ref: Dow Chemical Co.

Weld visual inspection 焊接目测检查

Ref. DVS Standard 2212-2

Weld visual inspection焊接目测检查

AWS (American Welding Society) and DVS Standards and EN Standards are excellent references for quality requirements of thermoplastic welds.

美国焊接协会、德国焊接协会标准和EN标准都是热塑性塑料焊接质量要求的极好参考

Safety 安全

Precautions using welding equipment to prevent burns

使用焊接设备时要小心防止烫伤Welding of fluoropolymers require proper ventilation to prevent breathing in fluorine vapors焊接含氟聚合物的时候，需要适当的通风措施，防止吸入氟气。Preparation of edges for welding require use of sharp tools – protect hands 制作焊接边角时会用到锋利的工具－－保护手。Abide by sheet mfg caution and use instructions

严格遵守安全规定和指导手册

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