Water Sample Coolers

Introduction

If there is a requirement to sample hot or boiling waters, the installation of sample coolers is essential for the following reasons.

Safety

To ensure compliance with health and safety regulations. The health and safety act 1974 requires employers to provide a safe method of sampling water in boiler plants.

Accuracy

A significant portion of any heated water sample will be lost to atmosphere as steam flashes off which means that the resultant sample will not be representative.

Convenience

Opening of drain plugs or loosening of pipe can be extremely difficult regardless of the safety hazard.

Two versions are available, one with a copper coil for general use, and one with a stainless coil to comply with any fluids that are incompatible with copper. Also there are fixed or removable coils available

Application

Sample coolers should be installed whenever it is necessary to obtain a sample of water from a system where the operating temperature exceeds 60 Oc i.e. steam boilers, steam and condensate mains. Closed heating circuits, and water systems.

Installation

The sample cooler should be installed as close as possible to the system take of point at a height to facilitate convenient operation; the unit must be mounted vertical.

An isolating valve capable of withstanding the full system pressure should be installed immediately to the take of point.

The cooling water should be taken to a suitable drain through a tundish

Operation

1. Open the cold-water inlet valve (a) fully and ensure cooling water is flowing to drain.
2. Open the sample regulating valve (b) slowly until system water starts to flow, then allow sample to run to waste for a suitable period to purge the stagnant water in the sample line.
3. Regulate the sample flow until a stable temperature of 15 oc. then collect sufficient volume of water in a suitable container
4. When sample has been acquired close the regulating valve then the cold-water inlet valve.

Maintenance

Should cooling deteriorate the coil can be removed for inspection by splitting the flange assembly.

Specification

Stainless Steel
Welded to BS EN 287
Fixed or removable coil
10mm Copper coil table y 0.8mm wall thickness. Suitable to pressures up to an including 16 bar C 202 oc
10mm Stainless coil type 316 1.OOmm wall thickness, annealed condition. Suitable for pressures up to and including 139 bar C 336 Oc
Max. Working pressure for the shell 14 bar
Coolant inlet and outlet 1/Z" b.s.p.
Corrosion resistant paint internally and externally applied
Sample flow controlled by a 3/8" valve. Cooling water by a 1/2" valve
Flange assembly on 16 rating
End plates- thickness 6mm