福建天利|酚醛泡沫管托與木、硅酸鈣管托的對比分析

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福建天利高新材料?福建天利酚醛泡沫與建筑節(jié)能?今天

之前福建天利|你還在用木管托嗎？英國標(biāo)準(zhǔn)《BS5970-2012》 已禁止使用木管托提到，《BS 5970-2012》標(biāo)準(zhǔn)已經(jīng)明確說明：木管托不應(yīng)被使用（“Wooden pipe supports should not be used”）。那么我們應(yīng)該采用什么管托呢？各種管托有什么優(yōu)缺點呢？請看下面這篇文章的分析。后面有英文原文。

保溫（冷）管托概述

什么是保溫（冷）管托？

保溫（冷）管托位于管道本身和支架之間，以保持熱性能。保溫（冷）管托的主要類型之一-酚醛泡沫，能夠有效阻止熱傳遞，以減少熱量損失和提高能量利用率。

你為什么需要它們？

保溫（冷）管托將管道與支架隔離，以限制熱傳遞和熱（冷）橋產(chǎn)生。它還必須有較好的蒸汽阻隔能力。

保溫（冷）管托的主要類型有哪些？

主要有三種主要類型的絕熱管托：

木材?- 這是絕緣管道支撐最傳統(tǒng)的方法。

酚醛泡沫?- 這已成為絕熱管道支架的**方法。

硅酸鈣?- 主要用于極高溫度。

木管托概述：

長期以來，木塊是保溫（冷）管托的**材料。然而，近年來，木管托的使用已經(jīng)減少。這可能是由于新的英國絕熱管支架標(biāo)準(zhǔn)BS5970：2012，現(xiàn)在認為“不應(yīng)使用木管托”。

這是由于木管托不能避免管道外部和管道之間產(chǎn)生熱（冷）橋，所以容易形產(chǎn)生冷凝，并且沒有辦法阻止水分滲透。

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酚醛泡沫管道保溫（冷）概述：

酚醛泡沫是木塊的一種非常有效的替代品，并迅速成為**的管托材料

通過對管托位置進行熱分析，可以看出，在低溫?zé)崴到y(tǒng)上，使用酚醛泡沫管托可以比使用木管托減少高達10倍的熱量損失。這是由于在低于環(huán)境溫度的管道系統(tǒng)上，酚醛泡沫有很好的保持蒸汽阻隔和防止熱傳遞能力。

由于更低的導(dǎo)熱系數(shù)（更好的保溫隔熱性能），酚醛泡沫比木材、硅酸鈣或泡沫玻璃能更好降低能耗、節(jié)約成本。

下圖顯示了（從左到右）酚醛泡沫管托，帶橡膠內(nèi)襯的金屬支（吊）架，金屬支（吊）架直接與管道連接，木管托的熱損失率。

硅酸鈣管托概述：

通常，在管道溫度超過120℃（250°F）的地方使用硅酸鈣絕熱材料。因此，在化工廠、煉油廠和蒸汽發(fā)電廠等這些地方經(jīng)常見到這種絕熱材料。

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保溫（冷）管托是否有規(guī)定？

如前所述，英國標(biāo)準(zhǔn) - BS5970-于2012年更新，這是與管道工程及其他工業(yè)設(shè)施的保溫隔熱相關(guān)的操作規(guī)范。2012年更新作了一些重大變化。

一個重大變化是，規(guī)范不再允許使用木管托，因為它們無法提供有效的蒸汽阻隔，并且具有較差的保溫隔熱性能。

此外，該標(biāo)準(zhǔn)建議固定在支架上的管托與管道上的絕熱材料相同（或兼容）。

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酚醛泡沫保溫（冷）管托的好處

酚醛泡沫管保溫（冷）管托經(jīng)過測試，可以與無內(nèi)襯支架及管道保溫隔熱材料兼容。我們的管托材料由高密度酚醛泡沫制成，具有**的保溫隔熱性能。它們不含氟氯化碳和氟氯烴，歸類為零ODP（臭氧消耗產(chǎn)品）。為了保證酚醛泡沫的技術(shù)性能，每批產(chǎn)品都會按照ISO 9001：2015進行測試。

除此之外，酚醛泡沫還可以增加特殊的涂層，可以消除銅管道管道腐蝕的任何可能性。另外采用階梯式的搭接方法，可以確保氣密性和準(zhǔn)確安裝。

因此，我們建議使用酚醛泡沫來作為新標(biāo)準(zhǔn)后的木管托替代品，因為它具有**的保溫隔熱性能及其他綜合性能。

英文原文：

An overview of insulated pipe supports

What are insulated pipe supports?

Insulated pipe supports sit in between the pipe itself and the?pipe clamp or clips, to maintain thermal performance. One of the main types of insulated pipe supports, phenolic foam blocks, work to prevent thermal conduction which can result in heat loss and an increase in energy usage.

Why do you need them?

Insulated pipe supports isolate the pipework from the pipe clamp to limit heat transfer and thermal bridging. It also allows for a continuous vapour barrier to be carried through the support system.

What are the main types of insulated pipe supports?

There are three main types of insulated pipe supports:

1. Wood – this is the most traditional method of insulating pipe supports.
2. Phenolic – this has become the preferred method of insulating pipe supports.
3. Calcium silicate – this is mainly used in extremely high temperatures.

Wood pipe insulation supports overview:

Wood blocks were the preferred material for insulating supports for a long time. In recent years, however, the use of wooden pipe support inserts has dwindled. This is likely due to the updated British Standard for insulated pipe supports, BS5970:2012 which now gives the view that “wooden pipe supports should not be used”.

Wood blocks do not offer a reasonable thermal bridge between the outer works and the pipe. There is an increased risk of condensation forming on wooden blocks and they are ineffective at maintaining vapour barriers.

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Phenolic foam pipe insulation overview:

Phenolic foam pipe insulation blocks?are a very effective alternative to wood blocks, and have rapidly become the number one preferred insulated pipe support material

Independent thermal analysis has shown that the use of phenolic insulated pipe support inserts can reduce heat loss through the supports of +75°C LTHW systems by up to 10x when compared to wood block inserts. This is in addition to the benefits of phenolic in maintaining the vapour barrier and limiting heat gain on systems operating below ambient temperature.

Phenolic insulation is also much more cost effective than wood, calcium silicate or foam glass alternatives due to a higher insulation value.

The image below demonstrates the rate of heat loss on (from left to right) phenolic pipe support, a rubber lined clip fixed to pipe, a metal clip fixed to pipe, wood block pipe support.

Calcium silicate pipe insulation overview:

Typically, calcium silicate insulation is used where pipe temperatures exceed 250°F. Therefore, the usual places you’ll find this type of insulation include chemical plants, refineries, and steam electric power plants.

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Are there any regulations for insulated pipe supports?

As previously mentioned, there is a British Standard – BS5970 – which was updated in 2012. This is a code of practice relating to the thermal insulation of pipework, ductwork, associated equipment and other industrial installations. The 2012 update included a few significant changes.

One change being that?the code of practice?no longer permits the use of wooden block pipe supports?due to them providing an ineffective vapour barrier and having poorer thermal properties than the alternatives. ?

In addition, the standard recommends that the pipe support bracket being fixed over the load bearing insulation is of the same material (or compatible with) the insulation on the pipe.

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The benefits of phenolic foam?insulated pipe supports

Phenolic foam pipe insulation supports are tested and guaranteed compatible with our main unlined clamp ranges . Our blocks are made from high-density phenolic foam with the best available thermal insulation properties. They are CFC and HCFC free and classified as Zero ODP (ozone depletion products). To guarantee the technical properties of our phenolic, each batch is also tested in accordance with ISO 9001:2015.

In addition to this,phenolic foam have a special bore coating, which eradicates any possibility of pipe corrosion on copper pipes. They are also manufactured with stepped joint faces to ensure vapour seal and accurate placement.

We would recommend the use of phenolic foam over the alternatives as it has the best insulation value.

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