Summarize the following court judgment. ivil Appeal No. 4800 of 1989. From the Judgment and Order dated 20.3.1987 of the Orissa High Court in Misc. Appeal No. 453 of 1982. Anil B. Divan and Vinoo Bhagat for the Appellant. G.L. Sanghi and A.K. Panda for the Respondent. The Judgment of the Court was delivered by V. RAMASWAMI	 J. Special leave granted. In respect of a dispute relating to the work Lankagada Minor Irrigation Project (Balance Work) in Jagannathaprasad Block which 351 was entrusted to him	 the appellant contractor	 invoking clause 23 of the agreement and section 8 of the Arbitration Act requested the Chief Engineer	 Rural Engineering Organi sation	 Bhubaneswar	 Orissa	 to nominate an arbitrator. It may be mentioned that before making this request for nomina tion of an arbitrator the appellant made a claim on 16.6. 1975 before the Executive Engineer	 M.I. Division	 Berham pur	 Ganjam	 claiming to be paid a sum of Rs.2	81	745. He had also claimed interest on this at the rate of 18 per cent from the date of receiving of the claim book till payment. The work entrusted to the appellant was to commence on 6.12. 1971 and to be completed within 18 months i.e. on or before 5.6.1973 and the total cost of the work was Rs.9.98	970. One Shri D.C. Panda	 Superintending Engineer	 Central Range	 was nominated as the sole arbitrator to decide the dispute and give the award. This arbitrator having accepted the appoint ment entered on the reference and issued notices to both the parties directing them to file their claims. The appellant filed a claim statement on 5.4. 1977 before the arbitrator. In this claim statement he had made a detailed description of each of the items of the claim and the total of the 15 items claimed came to Rs. 3	87	796. To this he added inter est at 18 per cent from the date which according to him each of the claims should have been settled making a total claim of interest to the tune of Rs.2	95	894. He thus prayed for an award of Rs.6	83	690 and also prayed for further interest on Rs.3	87	796 from 6.4. 1977 till date of award and there after until payment at 18 per cent. It may be mentioned that in this statement of claim made before the arbitrator some of the claims made before the Executive Engineer were omit ted	 some were reduced whereas some new claims were intro duced and some other items of claim were enhanced. The State of Orissa filed a written statement and the arbitration proceedings continued for some time but before the arbitra tor could make the award an application before the Subordi nate Judge	 Bhubaneswar was filed under sections 8(2) and 12 of the Arbitration Act. By an order dated 17.12.1979 the learned Subordinate Judge removed the arbitrator and ap pointed one Shri J. Pati	 Chief Construction Engineer	 Paradip Port as the sole arbitrator to decide the dispute between the parties. However	 since Shri J. Pati expressed his inability to arbitrate	 by another order dated 16.4.1980 the court appointed Shri Banabasi Patnaik	 Superintending Engineer	 Sambalpur as the sole arbitrator in place of Shri J. Pati. This arbitrator entered on the reference	 got all the relevant records from the previous arbitrator continued the hearing on the 9th June and 9th July	 1980. On the ground that the appellant has not included some of his claims "relating to this work" in the claim statement sub mitted to the previous arbitrator	 he made a supplemental claim for a sum of 352 Rs.8	27	857 and prayed that in addition to the claim stated in the original claim statement a sum of Rs.8	27	857 be awarded in his favour with interest at 18 per cent per annum on Rs.8.27	857 from 14.10. 1973 till date of payment. The State of Orissa not only disputed the claim made but also objected to the entertainment of an additional claim in their written statement dated August 13	 1981. The arbitra tor	 however	 decided to entertain the supplemental claim and proceeded with the hearing of the dispute. The supple ment claim consisted of 11 items. As seen from the note papers	 the arguments on supplemental claims 1 to 6 were heard on two different dates and the hearing was adjourned to 8.11. On that day arguments in respect of rest of the supplemental claim items were heard and the hearing was closed. On the same day the appellant contractor filed what he termed as one consolidated 'abstract ' of his two claim statements and the abstract showed a total claim of Rs.31	44	437 and he had further prayed in this that the total amount of Rs.31	44	437 may be allowed along with an interest at 18 per cent per annum on the said amount from 9.11. 198 1 till date of payment. The arbitrator made an award on 7.12. 1981 allowing a lump sum of Rs.25	00	156 together with interest at 9 per cent after the expiry of 30 days from the date of making the award	 till the date of payment or decree whichever is earlier. The award was filed in court for making a decree and the Government filed an application to set aside the award on various grounds. The trial court overruled the objections of the State and the award was made a decree of the court. However	 learned Judge disallowed the interest from the date of decree till reali sation. On appeal by the State Government	 the High Court came to the conclusion that award suffers from non applica tion of the mind amounting to legal misconduct. In that view the award was set aside and the matter was remitted back to the Arbitration Tribunal constituted under section 41 A of the Arbitration Act as amended by Orissa Act 3 of 1983. The contractor claimant has filed this appeal against this judgment of the High Court. As is seen from the award though it refers to getting all the relevant record from the ex arbitrator there is no reference to the heating of the parties or consideration of the documents relating to the original claim made on 6.4. 1977. In the order sheet it has been mentioned that both parties had agreed that they had nothing more to add except what had been already given in their respective claim and counter statement and what had been recorded in the deposi tions already made before the previous arbitrator. The reference to depositions already made is incorrect as it is admitted by both the parties that no deposition was at all recorded before the previous arbitrator nor 353 there is any record of the previous arbitrator showing such oral evidence was recorded by him. Neither of the parties adduced any oral evidence before the new arbitrator. Though the arbitrator is not bound to disclose as to what interpre tation he has made and what inference he has derived from the documentary evidence	 he is bound to refer in the award that he had considered all the documents placed before him no matter whether he relies on them or discards them from consideration. The arbitrator in his award ex facie does not mention that he has referred to or considered the documents placed before him in respect of the original claim. The order sheet mentions about the hearing on different dates relating to the supplemental claim statement which was filed before him. It is this argument in respect of the supplemen tal claim that has been mentioned in the award. The other point to be noted. is that the original claim together with the supplemental claim do not make total claim of Rs.31	44	437. It is seen from the records that the arbi trator directed the claimant to submit a consolidated claim abstract which was submitted by him on 8.11. 1981 the date on which the hearing by the arbitrator was concluded. There is clearly some discrepancy while consolidating both the claims. In addition to the total of both the claims some other amounts	 may be by way of extra interest or otherwise	 have been included but the arbitrator seem to have not applied his mind. Then again in the award it is stated that the total amount claimed by the claimantappellant inclusive of "damages	 compensation and interest" is Rs.31	44	437. Even the 'abstract ' filed before the arbitrator does not show any claim of "damages" or "compensation". As may be seen from the facts set out above	 before the appellant demanded the appointment of an arbitrator he had made a claim before the Executive Engineer for a sum of Rs.2.81	745. This is an iternised claim. This claim was made in the claim book kept by the Executive Engineer. It may be that this claim did not cover the entire amount due. We may point out that in the letter demanding the appointment of an arbitrator he had stated that during the execution of the work he had executed many extra items of work as per direc tions of the Department and also incurred heavy expenditure which were not covered in the agreement and that he had submitted "most of my claims in the claim book on 16.6.1965 but these have not yet been decided". It may also be men tioned that in this letter itself he has stated that he has completed the work in all respects on 14.9.1973 and that though the final bill which should have been prepared within one month of the completion of the work has not yet been paid to him. The claim made before the arbitrator originally as already stated was Rs.6	83	690 of which a sum 354 of Rs.3	87	796 represented the value of the work not paid and the remaining represented interest claimed. The total agreed value of the work entrusted to the appellant was Rs.9	98	970. In the counter affidavit filed by the State of Orissa in the special leave petition it is stated that a total of Rs.23	11	887 had been paid to the appellantcontrac tor by 20.11. 1976 which was with reference to the original work entrusted and the extra work done by the appellant. Arejoinder was filed by the appellant to this counter affi davit but the fact of payment of Rs.23	 11	887 is admitted. The supplemental claim itself was filed on 10.7.1980 and that amounted to Rs.8	27	857 over and above Rs.6	83	690 which he had claimed originally before the arbitrator. Then again the 'abstract ' filed by him on 8.11.1981 showed a figure of Rs.31	44	437 as the claim. We have already pointed out that the total of the claim made on 5.4. 1976 and the supplemental claim made on 10.7. 1980 itself will not make anyway that figure of Rs.31	44	437 and	 therefore	 some more claims have been included. The foregoing facts do show that the award suffers from non application of the mind by the arbitrator. This Court in State of Orissa vs Dandasi Sahu	 ; to which one of us (Sabyasachi Mukharji	 J.) was a party while noting that the amount award is quite high or that a large amount has been awarded does not by itself vitiate the award as such	 observed that one has to judge whether the amount of the award was so disproportionately high to make it per se bad on the facts and circumstances of a particular case. In this connection we have to keep in mind that we are concerned with a situation where the arbi trator need not give any reason and that even if he commits a mistake either in law or in fact in determining the matter referred to him	 where such mistake does not appear on the face of the award	 the same could not be assailed. The arbitrator	 in the case of a reference to him in pursuance of an arbitration agreement between the parties	 being a person chosen by parties is constituted as the sole and final judge of all the questions and the parties bind them selves as a rule to accept the award as final and conclu sive. The award could be interfered with only in limited circumstances as provided under sections 16 and 30 of the Arbitration Act. In this situation we have to test the award with circumspection. Even with all this limitations on the power of Court and probably because of these limitations	 we have to hold that if the amount awarded was disproportion ately high having regard to the original claim made and the totality of the circumstances it would certainly be a case where the arbitrator could be said to have not applied his mind amounting to legal misconduct. It may be seen that in this case in the 355 original claim made before the arbitrator the value of the work not paid was stated as Rs.3	87	796	 The supplemental claim made before the arbitrator amounted to Rs.8	27	857. Thus the total value of the work not paid	 according to the appellant	 was Rs. 12	 15	653. As against this claim the arbitrator has awarded a lump sum of Rs.25	00	156. It is true that the appellant has asked for payment of interest and including interest his claim was Rs.31	44	437. In a recent judgment of this Court in State of Orissa vs Niranjan Swain	 [1989] 4 SCC 269 it has been held that where a refer ence to arbitration was made prior to the commencement of the (which Act came into force on August 19	 198l) the arbitrator is not empowered to grant interest for the period upto the date of submission of the claim or the period during which the dispute was pending before the arbitrator. It was further held that where the award granted a lump sum amount it shall deem to have included the inter est also if interest had been claimed before the arbitrator and the inclusion of such interest rendered that part of award invalid. If we exclude the interest portion then there could be no doubt that award of Rs.25	00	156 suffers from the vice of giving disproportionately high amount. The learned counsel for the appellant	 however	 contend ed that the invalid part relating to the grant of interest may be set aside and the award may be accepted so far as the claim for the value of the work done applying the formula adopted in State of Orissa vs Niranjan Swain	 (supra). The learned Judges who decided the case after holding that inclusion of the interest rendered the award invalid	 pro ceeded to separate the invalid part from the rest stating that the total amount awarded is principal plus interest	 the rate of interest and the period for which the interest was claimed before known	 the principal could be determined easily	 and on that basis the principal amount and the interest out of the total amount awarded was divided and the award was sustained relating to the principal. We are unable to apply this principle in this case as the State had dis puted major part of the claim in their counter statements before the arbitrator and we have held that the award suf fers not merely on the ground that it included interest but also on the ground of non application of the mind. We are also of the view that there was nothing wrong in the approach of the High Court and that this is not a fit case for interference under Article 136 of the Constitution. We accordingly dismiss the appeal with costs. P.S.S Appeal dismissed.

The appellant contractor claimed a sum of Rs.3	87	796 before the sole arbitrator on April 5	 1977 for the value of 15 items of works not paid. To this he added interest to the tune of Rs.2	 95	894 at 18 per cent from the date which according to him each of the claims should have been set tled	 making a total of Rs.6	83	690. He also prayed for further interest at 18 per cent from April 6	 1977 till date of award and thereafter until payment. The respondent State filed its written statement and the arbitration proceedings continued for some time. But before the arbitrator could make an award	 an application under sections 8(2) and 12 of the Arbitration Act was filed before Subordinate Judge who by his order removed the arbitrator and appointed another person as the sole arbitrator. The new arbitrator entered on the reference	 got all the records from the previous arbi trator and continued the hearing. The appellant made a supplemental claim for a sum of Rs.8	27	857 and also prayed for interest on that amount at 18 per cent from October 14	 1973 till date of payment. The respondent State objected to the entertainment of additional claim. The arbitrator	 however	 proceeded with the hearing. On November 8	 1981	 the day the hearing was closed	 the appellant contractor filed one consolidated 'abstract ' of his two claim state ments showing a total claim of Rs.31.44.437 and also prayed for interest at 18 per cent per annum from November 9	 1981 till the date of payment. The arbitrator made an award on December 7	 1981 allow ing a lump sum of Rs.25	00	156 together with interest at 9 per cent after the expiry of 30 days from the date of making the award	 till the date of payment or decree whichever was earlier. The award was made a decree of the court. The court	 however	 disallowed interest from the date of decree till realisation. 349 On appeal by the respondent State the High Court came to the conclusion that the award was vitiated by non applica tion of mind amounting to legal misconduct. In that view	 it set aside the award and remitted the matter back to the Arbitration Tribunal constituted under section 41A of the Arbi tration Act	 as amended by Orissa Act 3 of 1983. Dismissing the appeal	 the Court	 HELD: 1.1 Though the arbitrator is not bound to disclose as to what interpretation he has made and what inference he has derived from the documentary evidence	 he is bound to refer in the award that he had considered all the documents placed before him	 no matter whether he relies on them or discards them from consideration. [353A] 1.2 In the instant case	 the arbitrator in his award ex facie did not mention that he had referred to or consid ered the documents placed before him in respect of the original claim. The order sheet mentions about the nearing on different dates relating to tile supplemental claim statement which was filed before him. It was this argument in respect of the supplemental claim that has been mentioned in the award. [353B] 2.1 The arbitrator in case of a reference to him in pursuance of an arbitration agreement between the parties	 being a person chosen by parties is constituted as the sole and final judge of all the questions and the parties bind themselves as a rule to accept the award as final and con clusive. Even in a case where the arbitrator does not give any reason or he commits a mistake either in law or in fact in determining the matter referred to him and such a mistake does not appear on the face of the award	 the same cannot be assailed. It could be interfered with only in limited cir cumstances as provided under sections 16 and 30 of the Act. The court has	 therefore	 to test the award with circumspection. 1354F	 E	 G] 2. 2 All the same	 if the amount awarded is dispropor tionately high having regard to the original claim made and the totality of the circumstances	 it would certainly be a case where the arbitrator could be said to have not applied his mind amounting to legal misconduct. [354G H] State of Orissa vs Dandasi Sahu	 ; 	 referred to. In the instant case	 in the original claim made before the arbitrator the value of the work not paid was stated as Rs.3	87	796. The supplemental claim made before the arbitrator amounted to 350 Rs.8	27	857. Thus	 the total value of work not paid	 accord ing to the appellant	 was Rs.12	15	653. As against this claim	 the arbitrator had awarded a lump sum of Rs.25	00	156. No doubt	 the appellant had asked for payment of interest and including interest his claim was Rs.31	44	437. [354H; 355A] 2.3 Where a reference to arbitration was made prior to the commencement of the which came into force on August 19	 1981 the arbitrator is not empowered to grant interest for the period upto the date of submission of the claim or the period during which the dispute was pending before the arbitrator	 and where the award granted a lump sum amount it shall deem to have included the interest also if interest had been claimed before the arbitrator and the inclusion of such interest would render that part of award invalid. [355B C] In the instant case	 if the interest portion is exclud ed	 then it becomes evident that award of Rs.25.00	156 suffers from the vice of giving disproportionately high amount. [355C D] 2.4 Since the award suffers not merely on the ground that it included interest but also on the ground of non application of the mind the question of setting aside only the invalid part relating to the grant of interest does not arise. [355F G] State of Orissa vs Niranjan Swain	 [1989] 4 SCC 269	 distinguished.