Hose and Fittings Measurements: Temperature

In our last blog post, we described how to measure Size, which is the first letter in the ‘STAMP’ acronym. Today, we’re moving onto the next letter: T, which stands for Temperature.

How STAMP works

STAMP is a hose and fittings measurement guide that is designed to make ordering hydraulics equipment as easy as possible. STAMP stands for:






T – How to measure Temperature

Temperature is used to specifically measure hoses. When specifying hose, there are two temperatures to identify:

-Ambient temperature: The temperature that exists outside the hose where it is being used

-Media temperature: The temperature of the media conveyed through the house

As you can imagine, temperature plays an important role in how the hose operates. Hoses need to be built to handle certain ambient and media temperatures. If they’re not correctly graded to a certain temperature level, then the hose and your hydraulics equipment may be seriously damaged.

Choosing the right ambient temperature is important because very high or low ambient temperatures result in reduced service life. Media temperatures, however, have a much greater impact on hose life. Rubber loses flexibility when operated at high temperatures for extended periods of time, which can cause all sorts of problems in the workplace.

Parker Hannifin hoses carry different temperature ratings for different fluids (the ‘media’). A Parker 811HT hose, for example, has a temperature range of -40°F to +257°F (-40°C to +125°C) when using petroleum-based hydraulic fluids. But when using water/oil emulsion hydraulic fluids, the upper range of this limit shrinks to 158°F (+70°C).

Ultimately, the most important lesson to get from this is that the maximum rated temperature of a hose is specific to the media. We’ll talk more about how to measure Media (the ‘M’ in STAMP) later on.

Why temperature is important

Remember, before ordering and hoses and fittings, be sure to pay attention to the STAMP acronym. Correctly sized hoses and fittings ensure the safety of everyone in a workplace and reduce wear and tear on hydraulics equipment. If you don’t take temperature into account, your hydraulics equipment will have a shorter lifespan – it’s as simple as that.

Parker Hannifin offers a wide range of special types of hoses that can be used for all sorts of different applications. Temperature ranges vary widely and some hoses are built to handle specific types of hydraulics media.

In order to better handle higher temperatures, some hydraulics hosing is manufactured with reinforced steel wire around the outside. This reinforces the rubber and protects the hose from extremely high or low temperatures.

Next, we’re going to look at the ‘A’ in STAMP, which stands for Application.


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