XGH塑料管道系統冷熱水循環試驗機
一、用途
塑料管道系統冷熱水循環試驗機適用于對各種管材和管件按規定的要求組裝并承受一定的內壓在溫度交替變化的次數后，檢查管材和管件的滲漏情況，該儀器主要用于管材管件組裝后的系統試驗。
適用于冷熱水系統用熱塑性管材管件系統和鋁塑管管件試驗的要求,以及適用于工作壓力為0.4MPA,0.6MPA,和1.0MPA的建筑物內用于輸送水的下列塑料管道系統:a)冷熱水,包括飲用水的管道系統.b)熱水采暖的管道系統。不適用于消防系統和不使用水作為加熱介質的供暖系統.試驗裝置采用了國外的*控制裝置對壓力進行控制，防止了水壓隨溫度和時間的波動，試驗壓力由國外進口的壓力泵提供，保證了壓力的*有效性穩定性。其檢測裝置根據水溫情況自動開啟相應的回水閥,減少了系統能耗,降低試驗成本。
儀器用特殊裝置大大消除了管路的噪聲，采用國內的制冷設備，功耗小，制冷量大；可靠的安全防護裝置和全面的液位測量裝置，保證了高低溫水箱的液位高度，當試驗失敗，管路有破裂時，及時的停機；能有效的對試驗人員進行保護又便于觀察試驗的過程，產品的設計*模擬產品實際應用中的景，設計思路在國內獨樹一幟。
二、符合標準
ISO 10508《用于冷熱水系統的熱塑性管材和管件的有關規定》
GB/T 18997.1-2003《鋁塑復合壓力管 第1部分：鋁管搭接焊式鋁塑管》
GB/T 18997.2-2003《鋁塑復合壓力管 第2部分：鋁管對接焊式鋁塑管》
GB/T 18742.1-2002《冷熱水用聚丙烯管道系統 第1部分：總則》
GB/T 18742.2-2002《冷熱水用聚丙烯管道系統 第2部分：管材》
GB/T 18742.3-2002《冷熱水用聚丙烯管道系統 第3部分：管件》
CJ/T 138-2001 建筑給水交聯聚乙烯（ＰＥ－Ｘ）管用管件技術條件標準的相關要求規定。
三、專業術語
工作溫度T0:系統設計的輸送水的溫度或溫度組合.
zui高工作溫度Tmzx:僅在短時間內出現的,可以接受的zui高溫度.
故障溫度Tn:系統超出控制極*出現的zui高溫度.
工作壓力P0:系統設計輸送水的壓力.
經處理的水:塑料管材、管件制造商和管道系統供應商所允許使用的含有水處理劑的水.
四、試驗試樣
1管材試樣可直接進行試驗(不超過Ф63)
①生產管件的材料應當制成管狀試樣，按GB/T 18252進行試驗，材料應達到產品標準規定的控制點。
②制作管件的材料需經下述(六)的材料性能試驗所驗證，試驗要求應考慮到zui終的使用條件級別和管件的類型。
五、試樣的安裝( 見附圖)
柔性管冷熱水循環試驗安裝示意圖
剛性塑料管冷熱水循環試驗安裝示意圖
六、計算
1、對于每種應用，首先要確定一個對應的使用條件級別，并用GB/T 18252-2000等方法得到50年使用時的zui大允許應力，再按要求選用合適的系數，按Miner’s規則進行計算。
計算下列式（1）和（2），取其中zui低值。
σ/рo……………………………（1）
式中：
σ—某應用條件級別的設計應力，單位為兆帕（MPa）
рo—工作壓力，為0.4、0.6或1.0 MPa
σ1/р1……………………………（2）
式中：
σ1—20℃下50年考慮了使用系數后的設計應力，單位為兆帕（MPa）
р1—1.0 Mpa的設計壓力
式（1）和式（2）中取較低值，按式（3）確定zui小設計壁厚：
σ dn-en
= ……………………………（3）
р 2en
式中：
σ/р選自式（1）或式（2）
dn—公稱外徑，單位為毫米（mm）
en—公稱壁厚，單位為毫米（mm）
2、使用系數
當計算zui大允許環應力時，所用溫度分布中的T0、Tmax、Tm和Tc的使用系數均在相應產品標準中規定。
七、系統使用性試驗
1、組裝件的靜液壓試驗
按ISO3458規定，將管材和管件連接成組裝件，在下列條件下進行試驗，管材和管件及連接處不應發生滲漏。
①試驗溫度為20℃±2℃，試驗壓力為рo的1.5倍，保持1h。
②試驗溫度為95℃±2℃，用管材材料1000h95℃的預測應力值除以（d-e）/2e計算出95℃±2℃的試驗壓力值，保持1000h。
2、熱循環試驗
試驗條件為：5000次循環，每次循環30min±2min，恒定在操作壓力рo（0.4，0.6或1.0 MPa）。每次循環應有一個15min的冷水（溫度為20℃±2℃）流動時間及一個15min的熱水（Tmax +10℃，但不超過90℃）流動時間。管材、管件及連接處不應發生滲漏。
八、特點：
本機所做試驗為長時間試驗，在儀器的設計中充分體現了這一性能，噪聲影響方面，儀器采用特殊裝置降低了管路的噪聲，制冷設備選擇方面，采用國外選進的制冷設備，并配以完善的保護，在控制和執行方面采用PLC微電腦控制，國外進口的所有加壓和控制執行閥，保證可靠的動作及完善執行，本機操作簡便，設計合理。操作界面人性化。界面直觀，具有*的性價比。
九、該儀器由四大部分組成：
1、冷水源系統提供試驗用高壓冷水及保證溫度穩定；
2、熱水源系統提供試驗用熱水并保證溫度穩定；
3、試樣箱用于安裝試樣。
4、控制系統為本機的*控制及試驗保障系統。
十、技術參數：
1有效壓力控制范圍: 0.400Mpa～1.200Mpa（可定制）
2壓力控制精度設定值: ±0.05 Mpa
3冷熱水交替時間: 小于60s
4冷熱水各循環時間: 300s～1200s之間任意設定
5循環次數: 0～100000次任意設定
6溫度顯示示值誤差: 1℃
7溫度均勻性: ±1℃
8出入口溫差: 2℃
9冷水源控制精度設定值: ±2℃
10冷水源設定范圍: 0℃～室溫（室溫 > 20℃）
11熱水源控制精度設定值: ±1℃
12熱水源控制范圍: 室溫～95℃
13zui大總測量橫截面積: ≤4200mm²(單路管徑zui大Φ63)
14試驗工位: 3路 6路
15顯示方式: 觸摸屏顯示
16控制方式: PLC控制
17試樣zui大直段管路長度: 3700mm
18水 源: 純水、去離子水或軟化水
19電 源: AC380V±10% 50Hz
20功 率: 25 kW
21儀器外形尺寸（長×寬×高）: (4500×3000×2000）mm（6工位尺寸）
22儀器安裝尺寸： (6000×4000×3000）mm
XGH plastic piping system cold water cycle testing machine
A, use
Plastic pipe system of hot and cold water cycle machine suitable for all kinds of pipes and pipe fittings according to the requirements of the assembly and absorb a certain amount of internal pressure after the number of temperature variations, monitor the leakage of the pipe and pipe fittings, this instrument is mainly used for pipe fitting system test after assembly.
Suitable for hot and cold water systems with thermoplastic pipe fitting and aluminum-plastic tubes test requirements, and is suitable for the working pressure is 0.4 MPA, 0.6 MPA, 1.0 MPA and building the following plastic pipe used for conveying water system: a) hot and cold water, including water pipe system. B) hot water heating pipe system.
Not applicable to fire coNTol system and do not use water as heat medium heating system. Test device adopts foreign advanced coNTol device to coNTol the pressure, to prevent the water pressure with fluctuations of temperature and time, test pressure is provided by the overseas import pressure pump and guarantee the long-term effectiveness of pressure stability.
The detection device automatically opens the corresponding backwater valve according to the water temperature, reduces the energy consumption of the system and reduces the test cost.
The instrument used special equipment to eliminate the noise of the pipeline, the domestic famous brand of refrigeration equipment, small power consumption, large amount of refrigeration;
Reliable safety protection device and comprehensive liquid level measuring device ensure the liquid level height of the high temperature water tank. When the test fails, the pipeline is broken, and timely stop.
It can effectively protect the test personnel and facilitate the observation of the experiment. The product design compley simulates the actual situation of the actual application of the product, and the design idea is unique in the couNTy.
Second, meet the standard
ISO 10508 "thermoplastic pipes and fittings for cold and hot water systems"
GB/T 18997.1-2003 "aluminum plastic compound pressure tube part 1: aluminum tube lap welded aluminum plastic pipe"
GB/T 18997.2-2003 "aluminum plastic compound pressure tube part 2: aluminum pipe butt welded aluminum plastic pipe"
GB/T 18742.1-2002 "cold and hot water polypropylene piping system part 1: general principles"
GB/T 18742-2002 "cold and hot water polypropylene piping system part 2: pipes"
GB/T 18742.3-2002 "cold and hot water polypropylene piping system part 3: pipe fittings"
CJ/T 138-2001 construction water supply crosslinked polyethylene (PE - X) pipe fittings technical standard requirements related requirements.
Technical terms
Temperature T0: the temperature or temperature combination of the system designed to convey water.
Highest working temperature Tmzx: only available in a short period of time, acceptable maximum temperature.
Failure temperature Tn: the maximum temperature when the system exceeds the limit of coNTol.
Pressure of work pressure: system design to transport water pressure.
Treated water: water treated with water treated by plastic tubing, pipe fittings manufacturer and supplier of piping systems.
Iv. Test samples
1 tube samples can be directly tested (no more than Ф 63)
The materials for the production of pipe fittings shall be made into tubular specimens and tested by GB/T 18252. The materials shall meet the coNTol points specified in the product standards.
The material of the production pipe shall be verified by the material performance test of the following (6). The test requirements shall take into account the final conditions of use and the type of pipe fittings.
5. Sample installation (see attached drawing)
Installation schematic of the cold and hot water cycling test of flexible pipe
Installation schematic of cold water circulating test of rigid plastic pipe
Six, calculation
1, for each application, the first thing to determine a corresponding level of using conditions, and using the methods of GB/T 18252-2000-50 years when using the maximum allowable stress, to choose suitable coefficient, according to the requirement by the Miner's rule to calculate.
Calculate the following formula (1) and (2) and take the lowest value.
Sigma/р o.................................
(1)
Type:
Sigma - a design stress at the applied condition level, with a unit of MPa.
р o - working pressure, 0.4, 0.6 or 0.4 MPa
Sigma 1 / р 1.......................................
(2)
Type:
Sigma 1-20 ℃ under consideration for 50 years after using coefficient of stress, the design of the unit for the MPa (MPa)
The design pressure of the р 1-1.0 Mpa
In formula (1) and (2), lower value is taken, and the minimum design wall thickness is determined by formula (3) :
Sigma dn - en
=.................................
(3)
р 2 en
Type:
Sigma/р from type (1) or (2)
Dn - nominal outer diameter, unit of mm (mm)
En - nominal wall thickness, mm (mm)
2. Use coefficient
The use coefficients of T0, Tmax, Tm and Tc in the temperature distribution are specified in the corresponding product standard when the maximum allowable ring stress is allowed.
Vii. System usability test
1. Static hydraulic test of assembly parts
According to iso 3458, the pipe and pipe fittings shall be connected to the assembly parts. Under the conditions of the following conditions, the pipes and fittings and fittings shall not leak.
(1) to test temperature is 20 ℃ + 2 ℃, the test pressure is 1.5 times that of р o keep 1 h.
(2) to test temperature is 95 ℃ + 2 ℃, tubing materials 1000 h95 ℃ to predict stress value divided by (d - e) / 2 e to calculate the 95 ℃ + 2 ℃ test pressure value, maintain 1000 h.
2. Thermal cycling test
Test conditions for: a 5000 - cycle, each loop 30 min plus or minus 2 min, constant in the operating pressure р o (0.4, 0.6 or 0.6 MPa).
(15 min each cycle should have a cold water temperature is 20 ℃ plus or minus 2 ℃) flow of time and a hot water for 15 min (Tmax + 10 ℃, but not over 90 ℃) flow of time.
Pipes, fittings and joints shall not leak.
Viii. Features:
Native do experiment for a long time, in the design of instrument embodies the this performance, noise effects, instrument with special devices to reduce the noise of the pipeline, refrigeration equipment selection, use of foreign elected to refrigeration equipment, and with perfect protection, PLC microcomputer coNTol in terms of coNTol and performance, the overseas import all the pressure and coNTol valve, to ensure reliable action and improve the execution, the machine is easy to operate, reasonable design.
The interface is user-friendly.
The interface is intuitive, with high cost performance.
9. The instrument consists of four parts:
1. Cold water supply system provides the test with high pressure cold water and guarantee temperature stability;
2. Hot water supply system is provided to test hot water and ensure temperature stability;
3. Sample box for installation of sample.
4. The coNTol system is the ceNTal coNTol and test guarantee system of the machine.
10. Technical parameters:
1. Effective pressure coNTol range: 0.400Mpa ~ 1.200Mpa (customizable)
2 pressure coNTol accuracy setting value: plus or minus 0.05 Mpa
Alternate time of cold and hot water: less than 60 seconds
4 cold water cycle time: 300s ~ 1200s arbitrary setting
5 cycles: 0 ~ 100,000 times arbitrary setting
Temperature display error value: 1 ℃
7 temperature uniformity: + / - 1 ℃
8 exit temperature difference: 2 ℃
Cold water coNTol precision value: 9 + 2 ℃
10 cold water set range: 0 ℃ to room temperature (20 ℃) at room temperature >
Hot water coNTol precision value: + / - 1 ℃
12 hot water coNTol: at room temperature to 95 ℃
13 largest total measurement of cross-sectional area: 4200 mm or less squared (single channel diameter maximum Φ 63)
Test station: 3 rd 6
Display mode: touch screen display
CoNTol mode: PLC coNTol
Length of the maximum straight section of the sample: 3700mm
Water source: pure water, deionized water or softened water
19 source: AC380V plus or minus 10% 50Hz
20 work rate: 25 kW
Size of instrument (length x width x height) : (4500 x 3000 x 2000) mm (6 workstation size)
Installation dimension of instrument: (6000 x 4000 x 3000) mm
