Local regulations may restrict the use of this product to below the conditions quoted.In the interests of development and improvement of the product, we reserve the right to change the specification. © Copyright 1994

TI-S01-03ST Issue 2

ISO 9001

TD42L and TD42H Thermodynamic Steam Trap

DescriptionThe TD42L and TD42H are maintainable thermodynamic steamtraps. The TD42L is specifically designed for relatively smallcondensate loads and therefore is ideal for mains drainageapplications. For process type loads the TD42H is available.For those applications where the release of air is a concern an anti-air binding disc is available. This version is designated by the letterA eg TD42LA and TD42HA.All traps have external body surfaces with an electroless nickel plate(ENP) finish which is both energy saving and oxidation resistant.

Available TypesTD42 L in sizes 3/8", ½", ¾", 1"TD42 H in sizes ½", ¾"TD42 LA (with anti air binding disc) in sizes 3/8", ½", ¾", 1"TD42 HA (with anti air binding disc) in size ½"

Limiting conditions (ISO 6552)Body design conditions PN 63PMA — Max. allowable pressure 63 bar gTMA — Max. allowable temperature 400°CCold hydraulic test pressure 95 bar g

Operating range (TD42 L and TD 42 H)

The product must not be used in this area(PMO — Max. operating pressure)Note: Minimum operating differential pressure for satisfactory operationis 0.25 bar (TD42 L and TD42 H), 0.8 bar (TD42 LA and TD42 HA),PMOB — Max. operating back pressure 80% of upstream pressure.

Sizes and pipe connections3/8", ½", ¾" and 1" Screwed BSP or NPT

MaterialsNo Part Material1 Body Stainless Steel (with ENP)

ASTM A743 Gr CA 40 F2 Cap Stainless Steel AISI 4163 Disc Stainless Steel BS 1449 420 S454 Strainer Screen Stainless Steel BS 1449 304 S165 Strainer Cap Stainless Steel AISI 4166 Insulating cover

(Optional extra) Aluminium

Operating range (TD42 LA and TD 42 HA)

Pressure bar g

1

2

3

Groove indentifiesLA and HAversions

TD42 LA and TD42 HAAnti Air binding disc

5

4

1

2

3

How to specifyTD 42 L SPIRAX SARCO Steam Trap Screwed ½" BSP

Pressure bar g

TD42L and TD42H Thermodynamic Steam Trap TI-S01-03 ST Issue 2

Dimensions (approximate) in millimetresSize A B E G H J K L Weight3/8" L 41 78 55 85 20 52 57 38 0.80 kg½" L 41 78 55 85 20 52 57 38 0.75 kg¾" L 44 90 60 100 20 52 57 38 0.95 kg1" L 48 95 65 100 20 58 57 38 1.5 kg½" H 41 78 55 85 41 57 57 38 0.8 kg¾" H 47 90 60 100 41 63 57 38 1 kg

Optional extrasInsulating Cover :— an insulating cover to prevent the trap beingunduly influenced by excessive heat loss such as when subjected tolow outside temperatures, wind, rain etc.Integral Blowdown Valve :— see TI-P153-01(TIS 2.514), also, thestrainer cap can be drilled, tapped and plugged ¼" BSP or NPT

InstallationPreferably fitted in a horizontal pipe but can be fitted in other positions.

Capacities

WithdrawalDistance for

InsulatingCover

WithdrawalDistancefor cap

WithdrawalDistance for screen

B

KHL

6

AJ

E G

Spare partsThe spare parts available are shown in heavy outline. Parts drawn inbroken line are not supplied as spares.

AVAILABLE SPAREDisc (Pkt of 3) (TD42 L or TD42 H) 3Disc and Strainer Screen (TD42 L or TD42 H) 3,4Strainer Screen (TD42 L or TD42 H) 4Insulating Cover 6

How to OrderAlways order spares by using the description given in the columnheaded Available Spare and stating the size and type of trap.

Example: 1 — Strainer Screen for ½" SPIRAX SARCO TD 42 LThermodynamic Steam Trap.

How to ServiceRemove insulating cover if fitted and unscrew cap using spanner.Do not use Stillsons or a wrench of similar type which may causedistortion of the cap.If the disc and body seating faces are only slightly worn they can berefaced by lapping individually on a flat surface such as a surfaceplate. A figure of eight motion and a little grinding compound givesthe best results.If the wear is too great to be rectified by simple lapping, the seatingfaces on the body must be ground flat and then lapped and the discreplaced by a new one. The total amount of metal removed in thisway should not exceed 0.25 mm (0.010").When re-assembling, the disc is normally placed in position with thegrooved side in contact with body seating face. Screw on cap; nogasket is required but a suitable high temperature anti-sieze greaseshould be applied to the threads.

To Clean or Replace StrainerUnscrew strainer cap using spanner, withdraw screen and clean, orif damaged replace with new one.To re-assemble, insert screen in cap, then screw cap into place. Nogasket is required but a fine smear of Molybdenum Disulphidegrease should be applied to the threads.

5

4

3

6

2

Recommended Tightening Torques

Item or Nm

mm

2 (TD42 L) 36 135-1502 (TD42 H) 41 135-1505 32 M28 250-275

3 /8", ½", ¾" & 1"L

¾"H

½"H