The accessibility of the heat exchanger surface for cleaning makes them particularly suitable for fouling services and a high degree of sanitation is required,as in food and pharmaceutical processing.Operating pressures and temperatures are limited by the natures of the available gasketing materials,with usual maxima of 300 psi and 400 88 2-2 The accessibility of the heat exchanger surface for cleaning makes them particularly suitable for fouling services and a high degree of sanitation is required, as in food and pharmaceutical processing. Operating pressures and temperatures are limited by the natures of the available gasketing materials, with usual maxima of 300 psi and 400 °