Carpenter & Paterson (Asia) Ltd

Province Samuthprakarn, 
  • Booth: F33

A warm welcome from Carpenter & Paterson (Asia) Ltd

Carpenter & Paterson (Asia) Ltd - global specialists in the design & manufacture of pipe suspension equipment. Our strategic location in Bangkok, combined with Western know-how/experience enables us to offer high quality yet competitive solutions to a range of clients across the power generation, petrochemical, oil & gas, LNG and related industries.

Brands: Pipe Supports, Pipe Hangers, Pipe Suspension Equipment, Variable & Constant Spring Supports, Dynamic Restraints, Snubbers, Cryogenic Pipe Supports, Pipe Shoes, Clamps, U-bolts, Pipe Support Design


  • CPA Variable & Constant Effort Spring Supports
    Variable & Constant Effort Spring supports are designed to accommodate the vertical displacement of a piping system caused by thermal expansion, thus avoiding excessive pipe stress. Variables/Constants are recommended for displacements under/over 75mm....


    A variable effort spring support is a resilient device which absorbs/accommodates the vertical displacement of a piping system, thus preventing excessive pipe stress. The variable support is recommended for relatively small displacement (up to about 75mm).

    CPA offers two categories of variable effort spring supports; ‘AV’ and ‘LV’. The AV (‘Asian Variable’) spring supports feature a fully enclosed, dimpled spring can with compact unilock travel stops. The LV (‘Locking Variable’) spring supports feature multilock locking rods on either side of the spring.

    Both the AV and LV spring supports are produced in four basic travel ranges; 35mm, 70mm, 140mm and 210mm.

    These travel ranges indicate the maximum working range of the springs. This full travel can be used provided that the necessary calculations are carried out to ensure that the connecting equipment and pipework can withstand the load changes that occur during pipe movement. Most national standards do limit the load variation to a maximum of 25%. It is therefore usual to select variable spring supports on this basis.

    The standard and optional design features of CPA variable supports are as follows:

    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.       Grade 316 stainless steel is used for scale plate and name plate.

    5.       Load indicator clearly visible.

    6.       Spring Pressure plate serves as a centering device.

    7.       Finish - hot dip galvanized - specialized coatings are also available.

    8.       All ‘F’ type floor/base mounted units are inclusive of load flange and internal load column guide.

    9.       Travel stops – The Carpenter & Paterson design is supplied with stops to take the preset and hydrostatic test loads.

    10.   No maintenance required.

    Optional Design Features:

    1.       Limit stops permanently installed to prevent the movement of the pipe beyond predetermined distance or load within the travel range of the spring.

    2.       Lifting lugs are available on large sizes to facilitate erection and installation.

    3.       For extreme environmental conditions we are able to manufacture our units in a range of austenitic stainless steels.


    A constant effort support is preferred when the use of a variable effort support may be not appropriate for the following reasons:

    1.       The vertical movement is too great for a variable effort support (approx. > 75mm).

    2.       Only a small change in load is acceptable (e.g. close to sensitive equipment).

    3.       Space considerations prevent the use of variable effort supports.

    The constant effort support designed and manufactured by CPA incorporates the latest design concepts to produce a support which provides an essentially constant supporting effort throughout the total travel of the unit. The robust and simple construction of the well-proven C&P design using a bell-crank lever has been enhanced to include universal locking of the load arm.

    With a cylindrical spring housing of substantial construction, and several support configurations to suit the position relative to steelwork and available space, the unit can be installed in many arrangements. The spring housing prevents the ingress of foreign bodies such as construction debris, thus reducing the danger of damage or restriction of the unit’s function.

    The universal locking mechanism allows the load arm to be locked in any position for the purpose of hydrostatic test, maintenance and decommissioning. The locking is done at the load arm so that excessive loadings are not transferred to the spring tension rod and spring coil. The threaded rods which are used for universal locking, are removed once the support has been installed and are stowed on the side of the spring housing.

    Standard Design Features:

    1.       The standard range of CPA constant effort supports are constructed to accommodate loads between 8kg and 33500kg with a standard range of travels between 40mm and 610mm in 10mm increments.

    2.       Constant effort supports are manufactured having maximum deviation of +/-5% of the specified load.

    3.       Universal Locking of the load arm is provided as standard.

    4.       Upper and lower travel stops are incorporated in all units to prevent excessive overtravel.

    5.       All supports are fitted with a clearly visible travel scale.

    6.       Supports are supplied with hot-dip galvanized finish as standard.

    7.       Spring coils are supplied plastic-coated as standard.

    8.       Screw Threads are ISO-metric coarse pitch series (6mm pitch series above size M64).

    Special Design Features:

    1.       Special Constant Supports can be designed for higher loadings or travels than are covered by the standard range.

    2.       Supports can be designed for hydrostatic test more than twice the operating load.

    3.       Supports can be supplied with special paint finish or manufactured from corrosion-resistant materials.

  • CPA Dynamic Restraints (Struts & Snubbers)
    Dynamic restraints (struts and snubbers) protect piping and supporting structures from excessive stress and deflections during dynamic events such as earthquakes (seismic activity), rapid valve closure, two phase flow and relief valve discharge.


    During normal operating conditions, CPA’s hydraulic snubber allows a piping system which experiences displacement to maintain its required flexibility. However, when being acted upon by dynamic forces, the snubber locks into place thus protecting the piping system to which it is attached.

    Unique benefits of CPA hydraulic snubber design:

    As illustrated above, CPA’s hydraulic snubber incorporates a ‘through rod’ design. This provides the following benefits over competitor products:

    1. No need for an external reservoir - the piston rod on either side of the piston means the hydraulic fluid volume does not change.
    2. Strong design – the piston rod is supported at both ends to avoid ‘knuckling’ and subsequent wear on the bearings.
    3. Small diameter – efficient design and no external reservoir results in a compact product.
    4. Enables the snubber to be installed in any orientation.
    5. Results in robust product with strong and reliable performance.

    Features of CPA hydraulic snubbers:

    1. Piston rod and main components of snubber are suitably treated to provide a high level of corrosion resistance. This avoids corrosion issues and wear of bearings which would occur if piston rod corroded.
    2. Sealing systems have been specially designed to ensure long working life without leakage.
    3. Hydraulic fluid specially selected for snubber operation.
    4. Compact design with pressurised built in hydraulic system. No external piping or reservoir. Requires minimal space envelope for installation.
    5. Rings of body of snubber, spaced at 10mm, provide an axial travel scale.
    6. Finish of non stainless steel parts is by hot zinc spray. This provides a better protection than galvanising or epoxy paint systems.
    7. Minimal lost motion in snubber performance achieved by design of seal system.
    8. Rod end connections on snubbers allow + - 5-degree angulation.
    9. Extension pieces on CSA snubbers provide precise installed lengths required.
    10. Valves are critical to the performance of a snubber. CPA valves have been fine-tuned by continuous testing as well as by calculation.

    Performance of CPA snubbers:

    1. Standard lock up rate 3 to 5 mm/sec
    2. Bleed rate 0.2 to 2mm/sec
    3. Drag force less than 2% of rated load
    4. All snubbers tested on our purpose built test rig and results tabulated as below.


    Where there is no pipe displacement at a required restraint location, a CPA rigid strut attached to the pipework and surrounding structure restrains any movement of the piping system during a dynamic event.

  • CPA Cold (cryogenic) & Hot Shoes
    CPA design and manufacture cold shoes (cryogenic pipe supports) and hot shoes. These pre-insulated supports incorporate high density polyurethane foam (cold shoes) and calcium silicate (hot shoes) as highly effective load bearing insulation mediums....


    Cold shoes (or Cryogenic pipe supports) are necessary when producing, processing, transporting and distributing liquefied gases such as Liquefied Natural Gas (LNG) or Liquid Petroleum Gas (LPG) which can reach temperatures as low as -165°c.

    CPA manufacture cryogenic pre-insulated pipe supports incorporating high density polyurethane foam (HD PUF) as a highly effective load bearing cryogenic insulation medium.

    CPA’s cryogenic supports are engineered in order to fulfil specific client requirements which may vary according to several factors, including load carrying capacity and installation restrictions, for example.


    CPA offers calcium silicate pre-insulated pipe supports, also known as ‘hot shoes’. Our high performance calcium silicate serves as an effective thermal insulation material up to temperatures of 1100°c.

Send Email

Type your information and click "Send Email" to send an email to this exhibitor. To return to the previous screen without saving, click "Reset".