General information

Local regulations may restrict the use of this product to below the conditions quoted.

Product limitations

In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2016

TI-GCM-02

CM Issue 7

Pressure / Temperature Limits

Technical Information sheets (TIs) for products in pressurised systems contain a 'Pressure / temperature limits' diagram. This diagram

indicates the envelope of the product(s) at the full range of pressures and temperatures. The construction of the 'Pressure / temperature

limits' diagram is shown below. Note: A table 'Definition of technical terms' and a typical example (no specific product) is displayed

overleaf.

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Note: This line will illustrate the

minimum operating temperature not

the minimum design temperature.

Pressure bar g

A

B

A

Is the maximum allowable temperature (TMA) the body of the

product can be raised to permanently, at a given pressure.

B

Is the maximum allowable pressure (PMA) which can be

tolerated within the body of the product at a given temperature.

It is a function of the PN rating and body design / material.

C

Is a prohibited area and the product must not be used in this

region and will be worded:

The product must not be used in this region.

D

The steam saturation curve is added (where relevant) to

enable users to easily find the specific operating points,

e.g. 10 bar g saturated steam @ 185°C, 10 bar g steam

with 20°C superheat or 10 bar g / 250°C steam.

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Pressure bar g

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Pressure bar g

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Pressure bar g

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