Variable Spring Supports

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Variable Spring Supports

Type ASpring

Type BSpring

Type CSpring

Type DSpring

Type ESpring Type FSpring Type GSpring

Standard Design Features

1. Precompression of the spring coil into the casing

saves headroom and erection time.2. For each series there is a reserve travel at the

upper and lower limits of the unit.

3. All steel construction that is rugged and compact.4. Non-corrosive material used for scale plate and

name plate.

5. Load indicator clearly visible.6. Spring Pressure plate serves as a centering

device.7. Finish - standard green synthetic resin basehammer finish - specialised coatings are also

available.8. All F type floor units are inclusive of load flange

and internal load column guide.

9. Travel Stops - The Carpenter & Paterson presetdesign locks the unit in the cold load position.The lock is operable in the vertical upwards direc-

tion only.10.No maintenance required.

Optional Design Features

1. Should the unit be subject to hydrostatic test loadthen the unit should be ordered complete withhydrostatic test stops. The strength of the preset

stops are so designed that it can withstand up to

two times the normal rated load for hydrostatictesting.

2. Limit stops permanently installed to prevent themovement of the pipe beyond predetermined

distance or load within the travel range of thespring.

3. Lifting lugs - are available on large sizes to

facilitate erection and installation.

4. Corrosion resistant - the unit is galvanised,except the spring, which is usually neoprene or

plastic coated.5. For extreme environmental conditions we are

able to manufacture our units in a range of auste-nitic stainless steels.

Specification

All Carpenter & Paterson variable spring supportsmeet the requirements of:-

British Standard 3974.U.S. Manufacturers Standardisation Society SP58U.S. Manufacturers Standardisation Society SP69The ANSI Code for Power Piping ANSI B31.1

The ANSI Code for Petroleum Refinery PipingB31.3 and others.

Ordering

When ordering please specify:-1. Hanger series, type and size.

(Example: DV35 - A - 8.)2. Operating Load.

3. Vertical movement and direction of movement,

cold to hot. (Example: 16mm up)

4. Thread details.

5. Whether hydrostatic stops are required.

6. Preset load if required sizes 0-2 inclusive.

7. Protective finish required.

8. Identification number.

9. Rod Centres and total load for Type G.

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Variable Spring SupportsFig. DV35-DV70-DV140-DV210

DepyTCepyTBepyTAepyT

Type E

Type H

Type GType F

General Note:Sizes 0-17 are manufactured utilising the dimpled casing construction.

Sizes 18-22 are manufactured as a totally welded unit.

Support Size Dimension R

0 - 5 54

6 - 14 54

15 - 17 70

18 - 20 84

21 115

22 131

Site Adjustments:Types A, B, C & G 75mm

Types F, H & K 25mm

Type K

X

Bolt Clearanceopenings in casing

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RR

Hole Centres Sq


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Variable Spring SupportsFIG. DV38-DV75-DV150

This range of supports is available in all types - see

page 46 for typical applications.

The units are not preset unless required.

Variable Support Selection Table

Loads N Loads Kg Travels mm

Size 01 Siz e 02 Siz e 01 Size 02 V150 V75 V38

88.97 177.95 9.07 18.14 0 0 0

95.15 184.13 9.70 18.77 10 5 2.5

101.33 190.31 10.33 19.40 20 10 5

107.51 196.49 10.96 20.03 30 15 7.5

113.69 202.67 11.59 20.66 40 20 10

119.87 208.85 12.22 21.29 50 25 12.5126.05 215.03 12.85 21.92 60 30 15

132.23 221.21 13.48 22.55 70 35 17.5

138.41 227.39 14.11 23.18 80 40 20

144.59 233.57 14.74 23.81 90 45 22.5

150.77 239.75 15.37 24.44 100 50 25

156.96 245.93 16.00 25.07 110 55 27.5

163.14 252.11 16.63 25.70 120 60 30

169.32 258.29 17.26 26.33 130 65 32.5

175.50 264.47 17.89 26.96 140 70 35

181.68 270.66 18.52 27.59 150 75 37.5

Spring RateKg/mm 0.063 0.125 0.25

N/mm 0.618 1.226 2.45

Fig. No DV.150

mm

DV.75 DV.38

01 02 mm mm

Rod TakeoutR 416 416 202 120

Can Length

L450 450 270 200

Loaded

Length

X

Min 539 539 330 245

Max 689 689 405 283

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This range of supports is available in types A, B, C, D, E, and F only- see page 46 for typical applications.The units are not present unless required.


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Additional Information for all Variable Spring Supports

Installation Instructions

Hanging type supports, typically Type A, are installedin position on the supporting steelwork, the sling rod isconnected between the pipe attachment (clamp or lug)

and the spring hanger turnbuckle. Rotation of theturnbuckle, transfers the pipe load to the spring

hanger. Base mounted supports typically Type F arelocated in the desired position beneath the pipe - loadis transferred from the pipe to the support by means of

rotating the central column. (Typical applications are

shown on page 46). Detailed installation instructionsare available on request.

Preset Lock Removal

This range of variable spring supports is preset to theinstalled load position prior to despatch from our works.The preset locks are fitted with a label drawing

attention to the fact that these must be removed priorto system operation. When fitted, the hydrostatic locks

prevent the spring deflecting during hydrostatic tests.They also must be removed prior to system operation.The preset locks fitted to hanging types are removed

by rotating the turnbuckle to increase load until the

locks are free - the locks are then withdrawn from thespring unit.In the case of the base mounted type, simply rotate thecentre column to increase load until the locks are free

- the locks are then withdrawn from the spring unit. Forthe removal of hydrostatic test locks the procedure isrepeated, except the turnbuckle/load column is rotated

to reduce load.All locks are removed by cutting the temporary banding

holding them in position in the unit.The locks can then be withdrawn.

Adjustment

When installed thespring units should be adjusteduntilthe load indicators point to the installed load position.The units should be checked following a reasonable

period of operation (preferably in the operatingcondition). The load indicator should be indicating the

operating load. If minor differences are apparent thenthe units should be adjusted to the operating position;no further adjustments should be necessary. If major

differences are noted then either consult the designer

or Carpenter & Patersons Engineering department foradvice, prior to making adjustments.Range of site adjustment:

Hanging Types: Base-mounted Types:

Plus and Minus 75mm Plus and Minus 25mm

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Standard Code of Practice

All piping systems shall be supported by means of supports satisfactory to the

designing engineer and having an individual means of vertical adjustment for

levelling of lines after piping is in place.

Adjustable hanger supports will be provided with either turnbuckle integral with sling

rod assembly or threaded rod passing through support structure with rocker washer

and nuts.

Roll Supports may be used on piping where there is longitudinal movement due to

temperature changes.

Pipe Covering Protection Saddles should be used on steam supply and return piping

with a roll of sufficient size to take the saddle.

Supports to be so spaced as toprevent sag of the pipe and to ensure proper drainage

of the pipe line.

Variable Spring Supports shall be located at points that are subjected to vertical

thermal movement and where a variation in load up to 25 per cent is allowable.

Constant Support Hangers shall be installed where the piping is subjected to verticalmovement and where minimum variation in supporting force is required.

The following conditions are desirable:-

a The sum of the pipeline weights must equal the sum of the supporting forces.b The sum of the moments of piping weight at their centre of gravity and the

supporting forces shall be equal to zero.

c Constant Support Hangers must be calibrated to support the calculated load

of the piping system.

Vibration Controls shall be installed in flexible lines where required to dampenvibration or lateral movement.

Anchors shall be installed to permit the line to take up its expansion and

contraction freely in opposite directions away from the anchored point and shallbe so designed for the particular location and loading conditions.

Where Expansion Joints are used Pipe Guides shall be installed to allow theexpansion and contraction of the pipe line to move freely within the expansion

joint.

In addition to thecomponents illustrated in this catalogue, we manufacture the full

range of support components in accordance with British Standards

3974 Part 1

Part 2

Part 3

See Section 5

Maximum spacing of supports

Nominal Pipe Size 15 20 25 40 50 65 80 100 125 150 200 250 300 350 400 450 500 600

Span Metres 2.0 2.5 3.0 3.5 4.0 4.5 5.5 6.0 6.5 7.0 8.5 9.0 10.0 10.0 10.5 11.0. 12.0 14.0

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Variable Spring Supports

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