instructions
for
hangers
Installation instructions for hangers
General
Hangers are delivered on pallets. Transport on site must be carried out with care in order to avoid damage to the products (name plates, scales, con- necting threads, adjustment devices and the corrosion protection are especially at risk). They should be stored indoors. For outdoor storage, hangers must be covered to protect them from dirt and moisture.
Connections
Prepare the connections required for fixing the hangers to the loadbearing structure beforehand, e.g.:
welding plates, clamping lugs or square plates for hanging versions, depend- ing on type of connection,
pre-drilled beams or support plates for base- mounted types.
Constant hangers should be aligned with the longitu- dinal direction of the beams.
Installation
Connect hangers in such a way that the forces can be transferred; secure support bolts with cotter pins, threaded connections with locknuts. (Final locking of the adjusting nuts of the FHS series cannot be car- ried out before attaching the load.)
Load attachment/ adjustment
Before attaching the load, screw the lower tie rod (threaded rod) into the hanger (do not exceed screw-in depth!) and connect it to the load to be carried.
Variable spring hangers with turnbuckle (FHD,
FHG)
Turn the turnbuckle until the prescribed cold load is reached. (The preset cold load – blue triangle – can be seen on the travel scale.)
This point is reached when the travel stops become loose and can be removed by hand (remove securing tape first).
Now slip the wire clips of the travel stops into the slots of the housing below the stop nibs of the spring plate and secure them with wires.
Load corrections can be carried out in the non-pre- set state by turning the turnbuckle further.
Hangers supplied in a non- preset state have to be adjusted to the required load according to the scale on the hanger.
Now lock the turnbuckle securely with a nut which has been screwed onto the adjoining threaded rod beforehand.
Double hanger with trapeze (FDT)
Install this version in a similar way to a variable spring hanger with turn- buckle, making sure that there is an equal load on each tie rod.
Variable spring hangers for continuous rods (FHS)
Turn the adjusting nut until the prescribed cold load is applied to the hanger. Then proceed as for the installation of a hanger with turnbuckle.
Lock the adjusting nut with an additional nut screwed onto the rod.
Constant hangers
(all versions with turn- buckle)
Turn the turnbuckle until the constant hanger car- ries the required load. This point is reached when the travel stop becomes loose.
Extract the cotter pins and remove the travel stop from the support bolts on both sides.
A pipe section with several constant hangers has to be considered as a com- plete unit. The pipe should be neither displaced nor placed under stress.
If the travel stop cannot be released immediately because the actual loads do not equal the required loads, the adjustment facil- ity (±15% of required load) allows the hanger to be adapted to suit the situa- tion.
Make sure beforehand that no unwanted connections hinder the movement of the line.
Carry out this adjustment meticulously, taking into account all the hangers in a pipe section.
On no account should the travel stops be removed by force.
After releasing the travel stops, attach them to the rear housing bolts and lock them in place with cotter pins. In versions with a horizontal spring housing, they are supported by the cover plate of the spring housing.
In every case, secure the turnbuckle with a nut screwed onto the tie rod beforehand.
Montagehinweise
für
Hänger
Variable spring supports and constant supports
(FSS/FSP/KSR/KSP)
With variable spring and constant supports size 01-11 by turning the adjust- ing nut, and with sping sup- ports size 12-16, as well as with constant supports you stress the adjusting nut on the support plate resp. on the load roll, until the cold load or the loading rate is reached and the travel stops can be removed. Adjusting possibility: spring supports + 30 mm constant supports +/- 20 mm With spring supports the support plate with collar (size 01-11) resp. with threaded bolt (size 12-16) ist sticked in loose.
In general proceed as de- scribed above for hangers.
Sway supports (FSG)
Fix sway supports to the loadbearing structure by means of brackets (MBS), and to the pipe by dynamic load clamps.
Adapt the length to the installation distance by means of the adjusting nut on the movable part of the sway support. Load take- up is also by means of turning this adjusting nut. (The spherical sway head is only inserted loosely at the movable end of the support.)
Adapt the load and release the travel stops afterwards, as described for variable spring hangers.
Note:
The installation of sway supports is only advisable if greater axial or lateral movements of the support- ed pipe are expected. The supported pipe itself must be secured sufficiently against unwanted lateral movement by means of suitable connections to the adjacent pipe system.
Sway supports cannot be used as pipe guides.
Hydraulic pressure test
Hangers and supports should be locked in posi- tion before hydraulic pres- sure tests of pipe systems in order to avoid unaccept- able movement of the pipe.
For nuclear power stations, according to KTA, the per- missible overload is 1.5 times the nominal load FN.
For other applications, an overload of up to 2.5 times the nominal load is permis- sible.
Owing to their dimensions, HYDRA®hangers can
sustain such overloads – even in a non-preset state – without permanent deformation.
Inspection during operation
Once the system is in operation, the hot positions of hangers or supports must be checked. If greater deviations are measured, corrective measures must be taken.
If the reasons for such deviations are working loads higher than those calculated, the hangers and supports must be adjusted.
Variable spring hangers and supports can be
adjusted by turning the turnbuckle or the adjusting nut.
Constant hangers and supports can be adjusted
by means of the load adjustment device by up to ±15% of the required load without restricting the specified travel.
A further change to the required load is possible if certain conditions are met. However, you should con- sult us first. If the actual travel exceeds the required travel (including reserves) or if the load exceeds even the operating load reserves of the hanger, the hanger must be replaced.
Maintenance
HYDRA®variable spring
hangers and supports as well as constant hangers and supports are absolu- tely maintenance-free. There is no need for spare parts.
FSG
Note for hanger installations:
Turnbuckles and adjusting nuts can be turned more easily under load if the thread has been thoroughly greased beforehand (MoS2). Turnbuckles and nuts with larger thread diameters (M48 and larger) cannot be turned under load. Additional equipment (lifting