PREMANT district heating pipe

PRE 6.325

Fittings installed in the ground

Description, installation and operating instructions

General

We only provide systematic heat insulation for ball valves if they are

suitable for direct installation in the ground, with or without pre-

stressing, i.e.:

A. if they fulfil the requirements acc. EN 488

B. if there are no screwed connectors in the insulated area.

Range of applications

• Upto160°C/16baror140°C/25bar

• Processed, deminer alized, clean tap water with low oxygen content

• not suitable for installation in the area of bends and expansion limbs

Material

• Housing made of steel, forged and welded.

• Ball in stainless steel

• Switching spindle in stainless steel

• Seals in reinforced Teflon

• Ball seal, spring-supported

• Spindle seal, multiple

• Monitoring wire, foamed in

• Heat insulation made of rigid PUR foam

• HDPE casing

Delivery and storage

• Ball valves in open position

• Protective caps on both pipe ends

Assembly / installation

• Only weld in the ball valves in the open position, and protect the

housing against overheating while doing so

• Install expansion pads in the area of the dome, as per the instructions

• Pay special attention to ensure that the dome has sufficient freedom

of movement

• The upper uninsulated section of the spindle must not stand in the

groundwater/other water

• The first switching operation must only take place after the pipe has

been flushed through (open the gate valve first)

• Ifthereisariskoffrost,uncoveredfittingsmustbecompletelyemptied

• Thoroughly grease the steel parts on the dome

• Ifthereisaprovisionalpipeend,thefreepipeendmustbeweldedshut

Position indicator

• Milled-in notch on switch spindle square, and pointer

Activation

• Close by turning to the right (clockwise) as far as the stop

(90° for ball valve)

Operation

• Matching socket wrenches must be used for switching

• Plug-on gears with matching receiver components can be supplied

for ball valves (our recommendation for DN 200 and above)

• Do not apply force to the switching shaft

• Do not overtighten the end stops

• Intermediate positions are not allowed for ball valves due to the

possbility of wear on the ball seals

• The processed tapwater must not contain any solid particles

because they could damage the sealing surfaces

Maintenance

• Periodically clean the steel parts on the dome and grease them

thoroughly

• Switch between OPEN and CLOSED several times, at least every

3 months, until smooth running is achieved

• Check the freedom of movement of the dome

• Check the groundwater level and condition

Important

It is essential to follow the above instructions. We and/or the

fittings manufacturer cannot provide any warranty for damage due

to incorrect installation, handling and maintenance.

23.5.2023 BGP

Subject to technical changes