EXHIBIT A

AGREEMENT REGARDING THE JOINT FILING OF

SCHEDULE 13D

The undersigned hereby agree as follows:

(i) Each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and

(ii) Each of them is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

This agreement may be executed in several counterparts, all of which together shall constitute one and the same instrument.

Date: March 28, 2014

	Wuxi Heavy Industries, Ltd.

	/s/ Sergey Alexandrovich Borovskiy
	Name: Sergey Alexandrovich Borovskiy
	Title: Director


	General Transactions, Inc.

	/s/ Sergey Alexandrovich Borovskiy
	Name: Sergey Alexandrovich Borovskiy
	Title: Director

	Sergey Alexandrovich Borovskiy

	/s/ Sergey Alexandrovich Borovskiy
	Name: Sergey Alexandrovich Borovskiy


	Longhua Piao

	/s/ Longhua Piao
	Name: Longhua Piao

	Expert Master Holdings Limited

	/s/ Longhua Piao
	Name: Longhua Piao
	Title: Director

	UMW Holdings Berhad

	/s/ Longhua Piao
	Name: Longhua Piao
	Title: Director

	UMW China Venture (L) Ltd.

	/s/ Longhua Piao
	Name: Longhua Piao
	Title: Director

	UMW Petropipe (L) Ltd.

	/s/ Longhua Piao
	Name: Longhua Piao
	Title: Director

WSP Holdings LTD SC 13D